ARSN-345: fixups

ARSN-345: linting
2023-06-08 11:16:12 +02:00 · 2023-06-08 09:08:01 +02:00 · 2023-06-07 18:44:42 +02:00 · 2023-06-07 18:25:24 +02:00
121 changed files with 12080 additions and 14224 deletions
--- a/.github/workflows/codeql.yaml
+++ b/.github/workflows/codeql.yaml
@ -14,12 +14,12 @@ jobs:
    runs-on: ubuntu-latest
    steps:
      - name: Checkout code
-        uses: actions/checkout@v4
+        uses: actions/checkout@v3

      - name: Initialize CodeQL
-        uses: github/codeql-action/init@v3
+        uses: github/codeql-action/init@v2
        with:
          languages: javascript, typescript

      - name: Build and analyze
-        uses: github/codeql-action/analyze@v3
+        uses: github/codeql-action/analyze@v2
--- a/.github/workflows/dependency-review.yaml
+++ b/.github/workflows/dependency-review.yaml
@ -10,7 +10,7 @@ jobs:
    runs-on: ubuntu-latest
    steps:
      - name: 'Checkout Repository'
-        uses: actions/checkout@v4
+        uses: actions/checkout@v3

      - name: 'Dependency Review'
-        uses: actions/dependency-review-action@v4
+        uses: actions/dependency-review-action@v3
--- a/.github/workflows/tests.yaml
+++ b/.github/workflows/tests.yaml
@ -25,8 +25,8 @@ jobs:
          - 6379:6379
    steps:
    - name: Checkout
-      uses: actions/checkout@v4
-    - uses: actions/setup-node@v4
+      uses: actions/checkout@v2
+    - uses: actions/setup-node@v2
      with:
        node-version: '16'
        cache: 'yarn'
@ -46,9 +46,7 @@ jobs:
      run: yarn --silent coverage
    - name: run functional tests
      run: yarn ft_test
-    - uses: codecov/codecov-action@v4
-      with:
-        token: ${{ secrets.CODECOV_TOKEN }}
+    - uses: codecov/codecov-action@v2
    - name: run executables tests
      run: yarn install && yarn test
      working-directory: 'lib/executables/pensieveCreds/'
@ -59,9 +57,9 @@ jobs:
    runs-on: ubuntu-latest
    steps:
    - name: Checkout
-      uses: actions/checkout@v4
+      uses: actions/checkout@v2
    - name: Install NodeJS
-      uses: actions/setup-node@v4
+      uses: actions/setup-node@v2
      with:
        node-version: '16'
        cache: yarn
@ -72,7 +70,7 @@ jobs:
      run: yarn build
      continue-on-error: true # TODO ARSN-97 Remove it when no errors in TS
    - name: Upload artifacts
-      uses: scality/action-artifacts@v4
+      uses: scality/action-artifacts@v2
      with:
        url: https://artifacts.scality.net
        user: ${{ secrets.ARTIFACTS_USER }}
--- a/.swcrc
+++ b/.swcrc
@ -1,12 +0,0 @@
-{
-  "$schema": "https://swc.rs/schema.json",
-  "jsc": {
-    "parser": {
-      "syntax": "typescript"
-    },
-    "target": "es2017"
-  },
-  "module": {
-    "type": "commonjs"
-  }
-}
--- a/documentation/BucketInfoModelVersion.md
+++ b/documentation/BucketInfoModelVersion.md
@ -245,16 +245,4 @@ For capacity-enabled buckets, contains the following data:

 ### Usage

-Used to store bucket tagging
-
-## Model version 17
-
-### Properties Added
-
-```javascript
-this._quotaMax = quotaMax || 0;
-```
-
-### Usage
-
-Used to store bucket quota
+Used to store bucket tagging
--- a/documentation/listingAlgos/delimiter.md
+++ b/documentation/listingAlgos/delimiter.md
@ -1,27 +0,0 @@
-# Delimiter
-
-The Delimiter class handles raw listings from the database with an
-optional delimiter, and fills in a curated listing with "Contents" and
-"CommonPrefixes" as a result.
-
-## Expected Behavior
-
- only lists keys belonging to the given **prefix** (if provided)
-
- groups listed keys that have a common prefix ending with a delimiter
-  inside CommonPrefixes
-
- can take a **marker** or **continuationToken** to list from a specific key
-
- can take a **maxKeys** parameter to limit how many keys can be returned
-
-## State Chart
-
- States with grey background are *Idle* states, which are waiting for
-  a new listing key
-
- States with blue background are *Processing* states, which are
-  actively processing a new listing key passed by the filter()
-  function
-
-![Delimiter State Chart](./pics/delimiterStateChart.svg)
--- a/documentation/listingAlgos/delimiterMaster.md
+++ b/documentation/listingAlgos/delimiterMaster.md
@ -1,45 +0,0 @@
-# DelimiterMaster
-
-The DelimiterMaster class handles raw listings from the database of a
-versioned or non-versioned bucket with an optional delimiter, and
-fills in a curated listing with "Contents" and "CommonPrefixes" as a
-result.
-
-## Expected Behavior
-
- only lists latest versions of versioned buckets
-
- only lists keys belonging to the given **prefix** (if provided)
-
- does not list latest versions that are delete markers
-
- groups listed keys that have a common prefix ending with a delimiter
-  inside CommonPrefixes
-
- can take a **marker** or **continuationToken** to list from a specific key
-
- can take a **maxKeys** parameter to limit how many keys can be returned
-
- reconciles internal PHD keys with the next version (those are
-  created when a specific version that is the latest version is
-  deleted)
-
- skips internal keys like replay keys
-
-## State Chart
-
- States with grey background are *Idle* states, which are waiting for
-  a new listing key
-
- States with blue background are *Processing* states, which are
-  actively processing a new listing key passed by the filter()
-  function
-
-### Bucket Vformat=v0
-
-![DelimiterMaster State Chart for v0 format](./pics/delimiterMasterV0StateChart.svg)
-
-### Bucket Vformat=v1
-
-For buckets in versioning key format **v1**, the algorithm used is the
-one from [Delimiter](delimiter.md).
--- a/documentation/listingAlgos/pics/delimiterMasterV0StateChart.dot
+++ b/documentation/listingAlgos/pics/delimiterMasterV0StateChart.dot
@ -1,45 +0,0 @@
-digraph {
-  node [shape="box",style="filled,rounded",fontsize=16,fixedsize=true,width=3];
-  edge [fontsize=14];
-  rankdir=TB;
-
-  START [shape="circle",width=0.2,label="",style="filled",fillcolor="black"]
-  END [shape="circle",width=0.2,label="",style="filled",fillcolor="black",peripheries=2]
-
-  node [fillcolor="lightgrey"];
-  "NotSkippingPrefixNorVersions.Idle" [label="NotSkippingPrefixNorVersions",group="NotSkippingPrefixNorVersions",width=4];
-  "SkippingPrefix.Idle" [label="SkippingPrefix",group="SkippingPrefix"];
-  "SkippingVersions.Idle" [label="SkippingVersions",group="SkippingVersions"];
-  "WaitVersionAfterPHD.Idle" [label="WaitVersionAfterPHD",group="WaitVersionAfterPHD"];
-
-  node [fillcolor="lightblue"];
-  "NotSkippingPrefixNorVersions.Processing" [label="NotSkippingPrefixNorVersions",group="NotSkippingPrefixNorVersions",width=4];
-  "SkippingPrefix.Processing" [label="SkippingPrefix",group="SkippingPrefix"];
-  "SkippingVersions.Processing" [label="SkippingVersions",group="SkippingVersions"];
-  "WaitVersionAfterPHD.Processing" [label="WaitVersionAfterPHD",group="WaitVersionAfterPHD"];
-
-  START -> "SkippingVersions.Idle" [label="[marker != undefined]"]
-  START -> "NotSkippingPrefixNorVersions.Idle" [label="[marker == undefined]"]
-
-  "NotSkippingPrefixNorVersions.Idle" -> "NotSkippingPrefixNorVersions.Processing" [label="filter(key, value)"]
-  "SkippingPrefix.Idle" -> "SkippingPrefix.Processing" [label="filter(key, value)"]
-  "SkippingVersions.Idle" -> "SkippingVersions.Processing" [label="filter(key, value)"]
-  "WaitVersionAfterPHD.Idle" -> "WaitVersionAfterPHD.Processing" [label="filter(key, value)"]
-
-
-  "NotSkippingPrefixNorVersions.Processing" -> "SkippingVersions.Idle" [label="[Version.isDeleteMarker(value)]\n-> FILTER_ACCEPT"]
-  "NotSkippingPrefixNorVersions.Processing" -> "WaitVersionAfterPHD.Idle" [label="[Version.isPHD(value)]\n-> FILTER_ACCEPT"]
-  "NotSkippingPrefixNorVersions.Processing" -> "SkippingPrefix.Idle" [label="[key.startsWith(<ReplayPrefix>)]\n/ prefix <- <ReplayPrefix>\n-> FILTER_SKIP"]
-  "NotSkippingPrefixNorVersions.Processing" -> END [label="[isListableKey(key, value) and\nKeys == maxKeys]\n-> FILTER_END"]
-  "NotSkippingPrefixNorVersions.Processing" -> "SkippingPrefix.Idle" [label="[isListableKey(key, value) and\nnKeys < maxKeys and\nhasDelimiter(key)]\n/ prefix <- prefixOf(key)\n/ CommonPrefixes.append(prefixOf(key))\n-> FILTER_ACCEPT"]
-  "NotSkippingPrefixNorVersions.Processing" -> "SkippingVersions.Idle" [label="[isListableKey(key, value) and\nnKeys < maxKeys and\nnot hasDelimiter(key)]\n/ Contents.append(key, value)\n-> FILTER_ACCEPT"]
-
-  "SkippingPrefix.Processing" -> "SkippingPrefix.Idle" [label="[key.startsWith(prefix)]\n-> FILTER_SKIP"]
-  "SkippingPrefix.Processing" -> "NotSkippingPrefixNorVersions.Processing" [label="[not key.startsWith(prefix)]"]
-
-  "SkippingVersions.Processing" -> "SkippingVersions.Idle" [label="[isVersionKey(key)]\n-> FILTER_SKIP"]
-  "SkippingVersions.Processing" -> "NotSkippingPrefixNorVersions.Processing" [label="[not isVersionKey(key)]"]
-
-  "WaitVersionAfterPHD.Processing" -> "NotSkippingPrefixNorVersions.Processing" [label="[isVersionKey(key) and master(key) == PHDkey]\n/ key <- master(key)"]
-  "WaitVersionAfterPHD.Processing" -> "NotSkippingPrefixNorVersions.Processing" [label="[not isVersionKey(key) or master(key) != PHDkey]"]
-}
--- a/documentation/listingAlgos/pics/delimiterMasterV0StateChart.svg
+++ b/documentation/listingAlgos/pics/delimiterMasterV0StateChart.svg
@ -1,216 +0,0 @@
-<?xml version="1.0" encoding="UTF-8" standalone="no"?>
-<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN"
- "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
-<!-- Generated by graphviz version 2.43.0 (0)
- -->
-<!-- Title: %3 Pages: 1 -->
-<svg width="2313pt" height="460pt"
- viewBox="0.00 0.00 2313.37 460.00" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
-<g id="graph0" class="graph" transform="scale(1 1) rotate(0) translate(4 456)">
-<title>%3</title>
-<polygon fill="white" stroke="transparent" points="-4,4 -4,-456 2309.37,-456 2309.37,4 -4,4"/>
-<!-- START -->
-<g id="node1" class="node">
-<title>START</title>
-<ellipse fill="black" stroke="black" cx="35.37" cy="-445" rx="7" ry="7"/>
-</g>
-<!-- NotSkippingPrefixNorVersions.Idle -->
-<g id="node3" class="node">
-<title>NotSkippingPrefixNorVersions.Idle</title>
-<path fill="lightgrey" stroke="black" d="M925.37,-387C925.37,-387 661.37,-387 661.37,-387 655.37,-387 649.37,-381 649.37,-375 649.37,-375 649.37,-363 649.37,-363 649.37,-357 655.37,-351 661.37,-351 661.37,-351 925.37,-351 925.37,-351 931.37,-351 937.37,-357 937.37,-363 937.37,-363 937.37,-375 937.37,-375 937.37,-381 931.37,-387 925.37,-387"/>
-<text text-anchor="middle" x="793.37" y="-365.2" font-family="Times,serif" font-size="16.00">NotSkippingPrefixNorVersions</text>
-</g>
-<!-- START&#45;&gt;NotSkippingPrefixNorVersions.Idle -->
-<g id="edge2" class="edge">
-<title>START&#45;&gt;NotSkippingPrefixNorVersions.Idle</title>
-<path fill="none" stroke="black" d="M42.39,-443.31C95.3,-438.15 434.98,-404.99 638.94,-385.08"/>
-<polygon fill="black" stroke="black" points="639.54,-388.53 649.15,-384.08 638.86,-381.57 639.54,-388.53"/>
-<text text-anchor="middle" x="497.87" y="-408.8" font-family="Times,serif" font-size="14.00">[marker == undefined]</text>
-</g>
-<!-- SkippingVersions.Idle -->
-<g id="node5" class="node">
-<title>SkippingVersions.Idle</title>
-<path fill="lightgrey" stroke="black" d="M242.37,-138C242.37,-138 50.37,-138 50.37,-138 44.37,-138 38.37,-132 38.37,-126 38.37,-126 38.37,-114 38.37,-114 38.37,-108 44.37,-102 50.37,-102 50.37,-102 242.37,-102 242.37,-102 248.37,-102 254.37,-108 254.37,-114 254.37,-114 254.37,-126 254.37,-126 254.37,-132 248.37,-138 242.37,-138"/>
-<text text-anchor="middle" x="146.37" y="-116.2" font-family="Times,serif" font-size="16.00">SkippingVersions</text>
-</g>
-<!-- START&#45;&gt;SkippingVersions.Idle -->
-<g id="edge1" class="edge">
-<title>START&#45;&gt;SkippingVersions.Idle</title>
-<path fill="none" stroke="black" d="M33.04,-438.14C20.64,-405.9 -34.57,-248.17 33.37,-156 36.76,-151.4 40.74,-147.39 45.16,-143.89"/>
-<polygon fill="black" stroke="black" points="47.27,-146.68 53.53,-138.13 43.3,-140.92 47.27,-146.68"/>
-<text text-anchor="middle" x="85.87" y="-321.8" font-family="Times,serif" font-size="14.00">[marker != undefined]</text>
-</g>
-<!-- END -->
-<g id="node2" class="node">
-<title>END</title>
-<ellipse fill="black" stroke="black" cx="727.37" cy="-120" rx="7" ry="7"/>
-<ellipse fill="none" stroke="black" cx="727.37" cy="-120" rx="11" ry="11"/>
-</g>
-<!-- NotSkippingPrefixNorVersions.Processing -->
-<g id="node7" class="node">
-<title>NotSkippingPrefixNorVersions.Processing</title>
-<path fill="lightblue" stroke="black" d="M925.37,-300C925.37,-300 661.37,-300 661.37,-300 655.37,-300 649.37,-294 649.37,-288 649.37,-288 649.37,-276 649.37,-276 649.37,-270 655.37,-264 661.37,-264 661.37,-264 925.37,-264 925.37,-264 931.37,-264 937.37,-270 937.37,-276 937.37,-276 937.37,-288 937.37,-288 937.37,-294 931.37,-300 925.37,-300"/>
-<text text-anchor="middle" x="793.37" y="-278.2" font-family="Times,serif" font-size="16.00">NotSkippingPrefixNorVersions</text>
-</g>
-<!-- NotSkippingPrefixNorVersions.Idle&#45;&gt;NotSkippingPrefixNorVersions.Processing -->
-<g id="edge3" class="edge">
-<title>NotSkippingPrefixNorVersions.Idle&#45;&gt;NotSkippingPrefixNorVersions.Processing</title>
-<path fill="none" stroke="black" d="M793.37,-350.8C793.37,-339.16 793.37,-323.55 793.37,-310.24"/>
-<polygon fill="black" stroke="black" points="796.87,-310.18 793.37,-300.18 789.87,-310.18 796.87,-310.18"/>
-<text text-anchor="middle" x="851.37" y="-321.8" font-family="Times,serif" font-size="14.00">filter(key, value)</text>
-</g>
-<!-- SkippingPrefix.Idle -->
-<g id="node4" class="node">
-<title>SkippingPrefix.Idle</title>
-<path fill="lightgrey" stroke="black" d="M1209.37,-138C1209.37,-138 1017.37,-138 1017.37,-138 1011.37,-138 1005.37,-132 1005.37,-126 1005.37,-126 1005.37,-114 1005.37,-114 1005.37,-108 1011.37,-102 1017.37,-102 1017.37,-102 1209.37,-102 1209.37,-102 1215.37,-102 1221.37,-108 1221.37,-114 1221.37,-114 1221.37,-126 1221.37,-126 1221.37,-132 1215.37,-138 1209.37,-138"/>
-<text text-anchor="middle" x="1113.37" y="-116.2" font-family="Times,serif" font-size="16.00">SkippingPrefix</text>
-</g>
-<!-- SkippingPrefix.Processing -->
-<g id="node8" class="node">
-<title>SkippingPrefix.Processing</title>
-<path fill="lightblue" stroke="black" d="M1070.37,-36C1070.37,-36 878.37,-36 878.37,-36 872.37,-36 866.37,-30 866.37,-24 866.37,-24 866.37,-12 866.37,-12 866.37,-6 872.37,0 878.37,0 878.37,0 1070.37,0 1070.37,0 1076.37,0 1082.37,-6 1082.37,-12 1082.37,-12 1082.37,-24 1082.37,-24 1082.37,-30 1076.37,-36 1070.37,-36"/>
-<text text-anchor="middle" x="974.37" y="-14.2" font-family="Times,serif" font-size="16.00">SkippingPrefix</text>
-</g>
-<!-- SkippingPrefix.Idle&#45;&gt;SkippingPrefix.Processing -->
-<g id="edge4" class="edge">
-<title>SkippingPrefix.Idle&#45;&gt;SkippingPrefix.Processing</title>
-<path fill="none" stroke="black" d="M1011.89,-101.96C994.96,-97.13 981.04,-91.17 975.37,-84 967.11,-73.56 966.25,-58.93 967.72,-46.2"/>
-<polygon fill="black" stroke="black" points="971.22,-46.52 969.4,-36.09 964.31,-45.38 971.22,-46.52"/>
-<text text-anchor="middle" x="1033.37" y="-65.3" font-family="Times,serif" font-size="14.00">filter(key, value)</text>
-</g>
-<!-- SkippingVersions.Processing -->
-<g id="node9" class="node">
-<title>SkippingVersions.Processing</title>
-<path fill="lightblue" stroke="black" d="M381.37,-36C381.37,-36 189.37,-36 189.37,-36 183.37,-36 177.37,-30 177.37,-24 177.37,-24 177.37,-12 177.37,-12 177.37,-6 183.37,0 189.37,0 189.37,0 381.37,0 381.37,0 387.37,0 393.37,-6 393.37,-12 393.37,-12 393.37,-24 393.37,-24 393.37,-30 387.37,-36 381.37,-36"/>
-<text text-anchor="middle" x="285.37" y="-14.2" font-family="Times,serif" font-size="16.00">SkippingVersions</text>
-</g>
-<!-- SkippingVersions.Idle&#45;&gt;SkippingVersions.Processing -->
-<g id="edge5" class="edge">
-<title>SkippingVersions.Idle&#45;&gt;SkippingVersions.Processing</title>
-<path fill="none" stroke="black" d="M141.4,-101.91C138.35,-87.58 136.8,-67.37 147.37,-54 151.89,-48.28 161.64,-43.34 173.99,-39.12"/>
-<polygon fill="black" stroke="black" points="175.39,-42.36 183.89,-36.04 173.3,-35.67 175.39,-42.36"/>
-<text text-anchor="middle" x="205.37" y="-65.3" font-family="Times,serif" font-size="14.00">filter(key, value)</text>
-</g>
-<!-- WaitVersionAfterPHD.Idle -->
-<g id="node6" class="node">
-<title>WaitVersionAfterPHD.Idle</title>
-<path fill="lightgrey" stroke="black" d="M1534.37,-138C1534.37,-138 1342.37,-138 1342.37,-138 1336.37,-138 1330.37,-132 1330.37,-126 1330.37,-126 1330.37,-114 1330.37,-114 1330.37,-108 1336.37,-102 1342.37,-102 1342.37,-102 1534.37,-102 1534.37,-102 1540.37,-102 1546.37,-108 1546.37,-114 1546.37,-114 1546.37,-126 1546.37,-126 1546.37,-132 1540.37,-138 1534.37,-138"/>
-<text text-anchor="middle" x="1438.37" y="-116.2" font-family="Times,serif" font-size="16.00">WaitVersionAfterPHD</text>
-</g>
-<!-- WaitVersionAfterPHD.Processing -->
-<g id="node10" class="node">
-<title>WaitVersionAfterPHD.Processing</title>
-<path fill="lightblue" stroke="black" d="M1534.37,-36C1534.37,-36 1342.37,-36 1342.37,-36 1336.37,-36 1330.37,-30 1330.37,-24 1330.37,-24 1330.37,-12 1330.37,-12 1330.37,-6 1336.37,0 1342.37,0 1342.37,0 1534.37,0 1534.37,0 1540.37,0 1546.37,-6 1546.37,-12 1546.37,-12 1546.37,-24 1546.37,-24 1546.37,-30 1540.37,-36 1534.37,-36"/>
-<text text-anchor="middle" x="1438.37" y="-14.2" font-family="Times,serif" font-size="16.00">WaitVersionAfterPHD</text>
-</g>
-<!-- WaitVersionAfterPHD.Idle&#45;&gt;WaitVersionAfterPHD.Processing -->
-<g id="edge6" class="edge">
-<title>WaitVersionAfterPHD.Idle&#45;&gt;WaitVersionAfterPHD.Processing</title>
-<path fill="none" stroke="black" d="M1438.37,-101.58C1438.37,-86.38 1438.37,-64.07 1438.37,-46.46"/>
-<polygon fill="black" stroke="black" points="1441.87,-46.22 1438.37,-36.22 1434.87,-46.22 1441.87,-46.22"/>
-<text text-anchor="middle" x="1496.37" y="-65.3" font-family="Times,serif" font-size="14.00">filter(key, value)</text>
-</g>
-<!-- NotSkippingPrefixNorVersions.Processing&#45;&gt;END -->
-<g id="edge10" class="edge">
-<title>NotSkippingPrefixNorVersions.Processing&#45;&gt;END</title>
-<path fill="none" stroke="black" d="M649.15,-273.62C611.7,-268.54 578.44,-260.07 566.37,-246 540.33,-215.64 540,-186.08 566.37,-156 586.46,-133.07 673.88,-148.86 702.37,-138 705.22,-136.91 708.06,-135.44 710.76,-133.82"/>
-<polygon fill="black" stroke="black" points="712.88,-136.61 719.13,-128.05 708.91,-130.84 712.88,-136.61"/>
-<text text-anchor="middle" x="672.87" y="-212.3" font-family="Times,serif" font-size="14.00">[isListableKey(key, value) and</text>
-<text text-anchor="middle" x="672.87" y="-197.3" font-family="Times,serif" font-size="14.00">Keys == maxKeys]</text>
-<text text-anchor="middle" x="672.87" y="-182.3" font-family="Times,serif" font-size="14.00">&#45;&gt; FILTER_END</text>
-</g>
-<!-- NotSkippingPrefixNorVersions.Processing&#45;&gt;SkippingPrefix.Idle -->
-<g id="edge9" class="edge">
-<title>NotSkippingPrefixNorVersions.Processing&#45;&gt;SkippingPrefix.Idle</title>
-<path fill="none" stroke="black" d="M937.6,-274.31C1018.89,-269.01 1106.69,-260.11 1119.37,-246 1143.16,-219.51 1134.03,-175.72 1124.38,-147.62"/>
-<polygon fill="black" stroke="black" points="1127.6,-146.22 1120.86,-138.04 1121.03,-148.64 1127.6,-146.22"/>
-<text text-anchor="middle" x="1254.37" y="-212.3" font-family="Times,serif" font-size="14.00">[key.startsWith(&lt;ReplayPrefix&gt;)]</text>
-<text text-anchor="middle" x="1254.37" y="-197.3" font-family="Times,serif" font-size="14.00">/ prefix &lt;&#45; &lt;ReplayPrefix&gt;</text>
-<text text-anchor="middle" x="1254.37" y="-182.3" font-family="Times,serif" font-size="14.00">&#45;&gt; FILTER_SKIP</text>
-</g>
-<!-- NotSkippingPrefixNorVersions.Processing&#45;&gt;SkippingPrefix.Idle -->
-<g id="edge11" class="edge">
-<title>NotSkippingPrefixNorVersions.Processing&#45;&gt;SkippingPrefix.Idle</title>
-<path fill="none" stroke="black" d="M799.18,-263.65C800.96,-258.05 802.85,-251.79 804.37,-246 814.73,-206.45 793.03,-183.41 823.37,-156 851.23,-130.83 954.1,-142.59 991.37,-138 992.65,-137.84 993.94,-137.68 995.24,-137.52"/>
-<polygon fill="black" stroke="black" points="995.81,-140.98 1005.29,-136.25 994.93,-134.03 995.81,-140.98"/>
-<text text-anchor="middle" x="969.37" y="-234.8" font-family="Times,serif" font-size="14.00">[isListableKey(key, value) and</text>
-<text text-anchor="middle" x="969.37" y="-219.8" font-family="Times,serif" font-size="14.00">nKeys &lt; maxKeys and</text>
-<text text-anchor="middle" x="969.37" y="-204.8" font-family="Times,serif" font-size="14.00">hasDelimiter(key)]</text>
-<text text-anchor="middle" x="969.37" y="-189.8" font-family="Times,serif" font-size="14.00">/ prefix &lt;&#45; prefixOf(key)</text>
-<text text-anchor="middle" x="969.37" y="-174.8" font-family="Times,serif" font-size="14.00">/ CommonPrefixes.append(prefixOf(key))</text>
-<text text-anchor="middle" x="969.37" y="-159.8" font-family="Times,serif" font-size="14.00">&#45;&gt; FILTER_ACCEPT</text>
-</g>
-<!-- NotSkippingPrefixNorVersions.Processing&#45;&gt;SkippingVersions.Idle -->
-<g id="edge7" class="edge">
-<title>NotSkippingPrefixNorVersions.Processing&#45;&gt;SkippingVersions.Idle</title>
-<path fill="none" stroke="black" d="M649.11,-279.23C439.56,-275.94 73.58,-267.19 53.37,-246 25.76,-217.06 30.6,-188.89 53.37,-156 56.56,-151.39 60.44,-147.39 64.78,-143.91"/>
-<polygon fill="black" stroke="black" points="66.8,-146.76 73.04,-138.2 62.83,-141 66.8,-146.76"/>
-<text text-anchor="middle" x="167.87" y="-204.8" font-family="Times,serif" font-size="14.00">[Version.isDeleteMarker(value)]</text>
-<text text-anchor="middle" x="167.87" y="-189.8" font-family="Times,serif" font-size="14.00">&#45;&gt; FILTER_ACCEPT</text>
-</g>
-<!-- NotSkippingPrefixNorVersions.Processing&#45;&gt;SkippingVersions.Idle -->
-<g id="edge12" class="edge">
-<title>NotSkippingPrefixNorVersions.Processing&#45;&gt;SkippingVersions.Idle</title>
-<path fill="none" stroke="black" d="M649.33,-279.1C514.97,-275.99 331.4,-267.75 305.37,-246 273.69,-219.53 311.53,-185.22 282.37,-156 276.73,-150.36 270.32,-145.59 263.42,-141.56"/>
-<polygon fill="black" stroke="black" points="264.92,-138.39 254.44,-136.84 261.67,-144.59 264.92,-138.39"/>
-<text text-anchor="middle" x="411.87" y="-227.3" font-family="Times,serif" font-size="14.00">[isListableKey(key, value) and</text>
-<text text-anchor="middle" x="411.87" y="-212.3" font-family="Times,serif" font-size="14.00">nKeys &lt; maxKeys and</text>
-<text text-anchor="middle" x="411.87" y="-197.3" font-family="Times,serif" font-size="14.00">not hasDelimiter(key)]</text>
-<text text-anchor="middle" x="411.87" y="-182.3" font-family="Times,serif" font-size="14.00">/ Contents.append(key, value)</text>
-<text text-anchor="middle" x="411.87" y="-167.3" font-family="Times,serif" font-size="14.00">&#45;&gt; FILTER_ACCEPT</text>
-</g>
-<!-- NotSkippingPrefixNorVersions.Processing&#45;&gt;WaitVersionAfterPHD.Idle -->
-<g id="edge8" class="edge">
-<title>NotSkippingPrefixNorVersions.Processing&#45;&gt;WaitVersionAfterPHD.Idle</title>
-<path fill="none" stroke="black" d="M937.38,-280.87C1099.43,-279.42 1344.59,-272.74 1378.37,-246 1411.11,-220.08 1384.48,-192.16 1405.37,-156 1407.38,-152.52 1409.8,-149.11 1412.4,-145.87"/>
-<polygon fill="black" stroke="black" points="1415.16,-148.04 1419.13,-138.21 1409.9,-143.41 1415.16,-148.04"/>
-<text text-anchor="middle" x="1486.87" y="-204.8" font-family="Times,serif" font-size="14.00">[Version.isPHD(value)]</text>
-<text text-anchor="middle" x="1486.87" y="-189.8" font-family="Times,serif" font-size="14.00">&#45;&gt; FILTER_ACCEPT</text>
-</g>
-<!-- SkippingPrefix.Processing&#45;&gt;SkippingPrefix.Idle -->
-<g id="edge13" class="edge">
-<title>SkippingPrefix.Processing&#45;&gt;SkippingPrefix.Idle</title>
-<path fill="none" stroke="black" d="M1064.61,-36.08C1074.44,-40.7 1083.66,-46.57 1091.37,-54 1101.65,-63.92 1107.13,-78.81 1110.04,-91.84"/>
-<polygon fill="black" stroke="black" points="1106.62,-92.56 1111.88,-101.76 1113.5,-91.29 1106.62,-92.56"/>
-<text text-anchor="middle" x="1190.37" y="-72.8" font-family="Times,serif" font-size="14.00">[key.startsWith(prefix)]</text>
-<text text-anchor="middle" x="1190.37" y="-57.8" font-family="Times,serif" font-size="14.00">&#45;&gt; FILTER_SKIP</text>
-</g>
-<!-- SkippingPrefix.Processing&#45;&gt;NotSkippingPrefixNorVersions.Processing -->
-<g id="edge14" class="edge">
-<title>SkippingPrefix.Processing&#45;&gt;NotSkippingPrefixNorVersions.Processing</title>
-<path fill="none" stroke="black" d="M899.82,-36.01C864.18,-48.2 824.54,-68.57 802.37,-102 771.84,-148.02 779.31,-216.26 786.77,-253.8"/>
-<polygon fill="black" stroke="black" points="783.43,-254.92 788.94,-263.97 790.28,-253.46 783.43,-254.92"/>
-<text text-anchor="middle" x="899.37" y="-116.3" font-family="Times,serif" font-size="14.00">[not key.startsWith(prefix)]</text>
-</g>
-<!-- SkippingVersions.Processing&#45;&gt;SkippingVersions.Idle -->
-<g id="edge15" class="edge">
-<title>SkippingVersions.Processing&#45;&gt;SkippingVersions.Idle</title>
-<path fill="none" stroke="black" d="M283.88,-36.24C281.71,-50.87 276.4,-71.43 263.37,-84 258.07,-89.11 252.06,-93.48 245.62,-97.21"/>
-<polygon fill="black" stroke="black" points="243.85,-94.19 236.61,-101.92 247.09,-100.39 243.85,-94.19"/>
-<text text-anchor="middle" x="349.87" y="-72.8" font-family="Times,serif" font-size="14.00">[isVersionKey(key)]</text>
-<text text-anchor="middle" x="349.87" y="-57.8" font-family="Times,serif" font-size="14.00">&#45;&gt; FILTER_SKIP</text>
-</g>
-<!-- SkippingVersions.Processing&#45;&gt;NotSkippingPrefixNorVersions.Processing -->
-<g id="edge16" class="edge">
-<title>SkippingVersions.Processing&#45;&gt;NotSkippingPrefixNorVersions.Processing</title>
-<path fill="none" stroke="black" d="M382.46,-36.08C396.72,-40.7 410.82,-46.57 423.37,-54 476.67,-85.57 487.28,-102.42 518.37,-156 539.39,-192.23 514.46,-218.85 546.37,-246 561.72,-259.06 598.56,-267.25 639.23,-272.39"/>
-<polygon fill="black" stroke="black" points="639.01,-275.89 649.36,-273.59 639.84,-268.93 639.01,-275.89"/>
-<text text-anchor="middle" x="590.37" y="-116.3" font-family="Times,serif" font-size="14.00">[not isVersionKey(key)]</text>
-</g>
-<!-- WaitVersionAfterPHD.Processing&#45;&gt;NotSkippingPrefixNorVersions.Processing -->
-<g id="edge17" class="edge">
-<title>WaitVersionAfterPHD.Processing&#45;&gt;NotSkippingPrefixNorVersions.Processing</title>
-<path fill="none" stroke="black" d="M1536.41,-36.13C1544.73,-40.79 1552.27,-46.65 1558.37,-54 1585.64,-86.89 1597.89,-215.12 1568.37,-246 1547.29,-268.05 1167.71,-276.42 947.74,-279.43"/>
-<polygon fill="black" stroke="black" points="947.67,-275.93 937.71,-279.57 947.76,-282.93 947.67,-275.93"/>
-<text text-anchor="middle" x="1758.37" y="-123.8" font-family="Times,serif" font-size="14.00">[isVersionKey(key) and master(key) == PHDkey]</text>
-<text text-anchor="middle" x="1758.37" y="-108.8" font-family="Times,serif" font-size="14.00">/ key &lt;&#45; master(key)</text>
-</g>
-<!-- WaitVersionAfterPHD.Processing&#45;&gt;NotSkippingPrefixNorVersions.Processing -->
-<g id="edge18" class="edge">
-<title>WaitVersionAfterPHD.Processing&#45;&gt;NotSkippingPrefixNorVersions.Processing</title>
-<path fill="none" stroke="black" d="M1546.51,-21.25C1677.94,-26.54 1888.29,-44.09 1937.37,-102 1947.71,-114.21 1946.85,-125.11 1937.37,-138 1841.62,-268.08 1749.48,-218.23 1590.37,-246 1471.26,-266.79 1143.92,-275.5 947.77,-278.94"/>
-<polygon fill="black" stroke="black" points="947.6,-275.44 937.66,-279.11 947.72,-282.44 947.6,-275.44"/>
-<text text-anchor="middle" x="2124.87" y="-116.3" font-family="Times,serif" font-size="14.00">[not isVersionKey(key) or master(key) != PHDkey]</text>
-</g>
-</g>
-</svg>
--- a/documentation/listingAlgos/pics/delimiterStateChart.dot
+++ b/documentation/listingAlgos/pics/delimiterStateChart.dot
@ -1,35 +0,0 @@
-digraph {
-  node [shape="box",style="filled,rounded",fontsize=16,fixedsize=true,width=3];
-  edge [fontsize=14];
-  rankdir=TB;
-
-  START [shape="circle",width=0.2,label="",style="filled",fillcolor="black"]
-  END [shape="circle",width=0.2,label="",style="filled",fillcolor="black",peripheries=2]
-
-  node [fillcolor="lightgrey"];
-  "NotSkipping.Idle" [label="NotSkipping",group="NotSkipping"];
-  "NeverSkipping.Idle" [label="NeverSkipping",group="NeverSkipping"];
-  "NotSkippingPrefix.Idle" [label="NotSkippingPrefix",group="NotSkippingPrefix"];
-  "SkippingPrefix.Idle" [label="SkippingPrefix",group="SkippingPrefix"];
-
-  node [fillcolor="lightblue"];
-  "NeverSkipping.Processing" [label="NeverSkipping",group="NeverSkipping"];
-  "NotSkippingPrefix.Processing" [label="NotSkippingPrefix",group="NotSkippingPrefix"];
-  "SkippingPrefix.Processing" [label="SkippingPrefix",group="SkippingPrefix"];
-
-  START -> "NotSkipping.Idle"
-  "NotSkipping.Idle" -> "NeverSkipping.Idle" [label="[delimiter == undefined]"]
-  "NotSkipping.Idle" -> "NotSkippingPrefix.Idle" [label="[delimiter == '/']"]
-
-  "NeverSkipping.Idle" -> "NeverSkipping.Processing" [label="filter(key, value)"]
-  "NotSkippingPrefix.Idle" -> "NotSkippingPrefix.Processing" [label="filter(key, value)"]
-  "SkippingPrefix.Idle" -> "SkippingPrefix.Processing" [label="filter(key, value)"]
-
-  "NeverSkipping.Processing" -> END [label="[nKeys == maxKeys]\n-> FILTER_END"]
-  "NeverSkipping.Processing" -> "NeverSkipping.Idle" [label="[nKeys < maxKeys]\n/ Contents.append(key, value)\n -> FILTER_ACCEPT"]
-  "NotSkippingPrefix.Processing" -> END [label="[nKeys == maxKeys]\n -> FILTER_END"]
-  "NotSkippingPrefix.Processing" -> "SkippingPrefix.Idle" [label="[nKeys < maxKeys and hasDelimiter(key)]\n/ prefix <- prefixOf(key)\n/ CommonPrefixes.append(prefixOf(key))\n-> FILTER_ACCEPT"]
-  "NotSkippingPrefix.Processing" -> "NotSkippingPrefix.Idle" [label="[nKeys < maxKeys and not hasDelimiter(key)]\n/ Contents.append(key, value)\n -> FILTER_ACCEPT"]
-  "SkippingPrefix.Processing" -> "SkippingPrefix.Idle" [label="[key.startsWith(prefix)]\n-> FILTER_SKIP"]
-  "SkippingPrefix.Processing" -> "NotSkippingPrefix.Processing" [label="[not key.startsWith(prefix)]"]
-}
--- a/documentation/listingAlgos/pics/delimiterStateChart.svg
+++ b/documentation/listingAlgos/pics/delimiterStateChart.svg
@ -1,166 +0,0 @@
-<?xml version="1.0" encoding="UTF-8" standalone="no"?>
-<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN"
- "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
-<!-- Generated by graphviz version 2.43.0 (0)
- -->
-<!-- Title: %3 Pages: 1 -->
-<svg width="975pt" height="533pt"
- viewBox="0.00 0.00 975.00 533.00" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
-<g id="graph0" class="graph" transform="scale(1 1) rotate(0) translate(4 529)">
-<title>%3</title>
-<polygon fill="white" stroke="transparent" points="-4,4 -4,-529 971,-529 971,4 -4,4"/>
-<!-- START -->
-<g id="node1" class="node">
-<title>START</title>
-<ellipse fill="black" stroke="black" cx="283" cy="-518" rx="7" ry="7"/>
-</g>
-<!-- NotSkipping.Idle -->
-<g id="node3" class="node">
-<title>NotSkipping.Idle</title>
-<path fill="lightgrey" stroke="black" d="M379,-474C379,-474 187,-474 187,-474 181,-474 175,-468 175,-462 175,-462 175,-450 175,-450 175,-444 181,-438 187,-438 187,-438 379,-438 379,-438 385,-438 391,-444 391,-450 391,-450 391,-462 391,-462 391,-468 385,-474 379,-474"/>
-<text text-anchor="middle" x="283" y="-452.2" font-family="Times,serif" font-size="16.00">NotSkipping</text>
-</g>
-<!-- START&#45;&gt;NotSkipping.Idle -->
-<g id="edge1" class="edge">
-<title>START&#45;&gt;NotSkipping.Idle</title>
-<path fill="none" stroke="black" d="M283,-510.58C283,-504.23 283,-494.07 283,-484.3"/>
-<polygon fill="black" stroke="black" points="286.5,-484.05 283,-474.05 279.5,-484.05 286.5,-484.05"/>
-</g>
-<!-- END -->
-<g id="node2" class="node">
-<title>END</title>
-<ellipse fill="black" stroke="black" cx="196" cy="-120" rx="7" ry="7"/>
-<ellipse fill="none" stroke="black" cx="196" cy="-120" rx="11" ry="11"/>
-</g>
-<!-- NeverSkipping.Idle -->
-<g id="node4" class="node">
-<title>NeverSkipping.Idle</title>
-<path fill="lightgrey" stroke="black" d="M262,-387C262,-387 70,-387 70,-387 64,-387 58,-381 58,-375 58,-375 58,-363 58,-363 58,-357 64,-351 70,-351 70,-351 262,-351 262,-351 268,-351 274,-357 274,-363 274,-363 274,-375 274,-375 274,-381 268,-387 262,-387"/>
-<text text-anchor="middle" x="166" y="-365.2" font-family="Times,serif" font-size="16.00">NeverSkipping</text>
-</g>
-<!-- NotSkipping.Idle&#45;&gt;NeverSkipping.Idle -->
-<g id="edge2" class="edge">
-<title>NotSkipping.Idle&#45;&gt;NeverSkipping.Idle</title>
-<path fill="none" stroke="black" d="M216.5,-437.82C206.51,-433.18 196.91,-427.34 189,-420 182.25,-413.74 177.33,-405.11 173.81,-396.79"/>
-<polygon fill="black" stroke="black" points="177.05,-395.47 170.3,-387.31 170.49,-397.9 177.05,-395.47"/>
-<text text-anchor="middle" x="279.5" y="-408.8" font-family="Times,serif" font-size="14.00">[delimiter == undefined]</text>
-</g>
-<!-- NotSkippingPrefix.Idle -->
-<g id="node5" class="node">
-<title>NotSkippingPrefix.Idle</title>
-<path fill="lightgrey" stroke="black" d="M496,-387C496,-387 304,-387 304,-387 298,-387 292,-381 292,-375 292,-375 292,-363 292,-363 292,-357 298,-351 304,-351 304,-351 496,-351 496,-351 502,-351 508,-357 508,-363 508,-363 508,-375 508,-375 508,-381 502,-387 496,-387"/>
-<text text-anchor="middle" x="400" y="-365.2" font-family="Times,serif" font-size="16.00">NotSkippingPrefix</text>
-</g>
-<!-- NotSkipping.Idle&#45;&gt;NotSkippingPrefix.Idle -->
-<g id="edge3" class="edge">
-<title>NotSkipping.Idle&#45;&gt;NotSkippingPrefix.Idle</title>
-<path fill="none" stroke="black" d="M340.77,-437.93C351.2,-433.2 361.45,-427.29 370,-420 377.58,-413.53 383.76,-404.65 388.51,-396.16"/>
-<polygon fill="black" stroke="black" points="391.63,-397.74 393.08,-387.24 385.4,-394.54 391.63,-397.74"/>
-<text text-anchor="middle" x="442.5" y="-408.8" font-family="Times,serif" font-size="14.00">[delimiter == &#39;/&#39;]</text>
-</g>
-<!-- NeverSkipping.Processing -->
-<g id="node7" class="node">
-<title>NeverSkipping.Processing</title>
-<path fill="lightblue" stroke="black" d="M204,-270C204,-270 12,-270 12,-270 6,-270 0,-264 0,-258 0,-258 0,-246 0,-246 0,-240 6,-234 12,-234 12,-234 204,-234 204,-234 210,-234 216,-240 216,-246 216,-246 216,-258 216,-258 216,-264 210,-270 204,-270"/>
-<text text-anchor="middle" x="108" y="-248.2" font-family="Times,serif" font-size="16.00">NeverSkipping</text>
-</g>
-<!-- NeverSkipping.Idle&#45;&gt;NeverSkipping.Processing -->
-<g id="edge4" class="edge">
-<title>NeverSkipping.Idle&#45;&gt;NeverSkipping.Processing</title>
-<path fill="none" stroke="black" d="M64.1,-350.93C47.33,-346.11 33.58,-340.17 28,-333 15.72,-317.21 17.05,-304.74 28,-288 30.93,-283.52 34.58,-279.6 38.69,-276.19"/>
-<polygon fill="black" stroke="black" points="40.97,-278.86 47.1,-270.22 36.92,-273.16 40.97,-278.86"/>
-<text text-anchor="middle" x="86" y="-306.8" font-family="Times,serif" font-size="14.00">filter(key, value)</text>
-</g>
-<!-- NotSkippingPrefix.Processing -->
-<g id="node8" class="node">
-<title>NotSkippingPrefix.Processing</title>
-<path fill="lightblue" stroke="black" d="M554,-270C554,-270 362,-270 362,-270 356,-270 350,-264 350,-258 350,-258 350,-246 350,-246 350,-240 356,-234 362,-234 362,-234 554,-234 554,-234 560,-234 566,-240 566,-246 566,-246 566,-258 566,-258 566,-264 560,-270 554,-270"/>
-<text text-anchor="middle" x="458" y="-248.2" font-family="Times,serif" font-size="16.00">NotSkippingPrefix</text>
-</g>
-<!-- NotSkippingPrefix.Idle&#45;&gt;NotSkippingPrefix.Processing -->
-<g id="edge5" class="edge">
-<title>NotSkippingPrefix.Idle&#45;&gt;NotSkippingPrefix.Processing</title>
-<path fill="none" stroke="black" d="M395.69,-350.84C392.38,-333.75 390.03,-307.33 401,-288 403.42,-283.74 406.58,-279.94 410.19,-276.55"/>
-<polygon fill="black" stroke="black" points="412.5,-279.18 418.1,-270.18 408.11,-273.73 412.5,-279.18"/>
-<text text-anchor="middle" x="459" y="-306.8" font-family="Times,serif" font-size="14.00">filter(key, value)</text>
-</g>
-<!-- SkippingPrefix.Idle -->
-<g id="node6" class="node">
-<title>SkippingPrefix.Idle</title>
-<path fill="lightgrey" stroke="black" d="M554,-138C554,-138 362,-138 362,-138 356,-138 350,-132 350,-126 350,-126 350,-114 350,-114 350,-108 356,-102 362,-102 362,-102 554,-102 554,-102 560,-102 566,-108 566,-114 566,-114 566,-126 566,-126 566,-132 560,-138 554,-138"/>
-<text text-anchor="middle" x="458" y="-116.2" font-family="Times,serif" font-size="16.00">SkippingPrefix</text>
-</g>
-<!-- SkippingPrefix.Processing -->
-<g id="node9" class="node">
-<title>SkippingPrefix.Processing</title>
-<path fill="lightblue" stroke="black" d="M691,-36C691,-36 499,-36 499,-36 493,-36 487,-30 487,-24 487,-24 487,-12 487,-12 487,-6 493,0 499,0 499,0 691,0 691,0 697,0 703,-6 703,-12 703,-12 703,-24 703,-24 703,-30 697,-36 691,-36"/>
-<text text-anchor="middle" x="595" y="-14.2" font-family="Times,serif" font-size="16.00">SkippingPrefix</text>
-</g>
-<!-- SkippingPrefix.Idle&#45;&gt;SkippingPrefix.Processing -->
-<g id="edge6" class="edge">
-<title>SkippingPrefix.Idle&#45;&gt;SkippingPrefix.Processing</title>
-<path fill="none" stroke="black" d="M452.35,-101.95C448.76,-87.65 446.54,-67.45 457,-54 461.44,-48.29 471.08,-43.36 483.3,-39.15"/>
-<polygon fill="black" stroke="black" points="484.61,-42.41 493.1,-36.07 482.51,-35.73 484.61,-42.41"/>
-<text text-anchor="middle" x="515" y="-65.3" font-family="Times,serif" font-size="14.00">filter(key, value)</text>
-</g>
-<!-- NeverSkipping.Processing&#45;&gt;END -->
-<g id="edge7" class="edge">
-<title>NeverSkipping.Processing&#45;&gt;END</title>
-<path fill="none" stroke="black" d="M102.91,-233.88C97.93,-213.45 93.18,-179.15 109,-156 123.79,-134.35 154.41,-126.09 175.08,-122.94"/>
-<polygon fill="black" stroke="black" points="175.62,-126.4 185.11,-121.69 174.76,-119.45 175.62,-126.4"/>
-<text text-anchor="middle" x="185" y="-189.8" font-family="Times,serif" font-size="14.00">[nKeys == maxKeys]</text>
-<text text-anchor="middle" x="185" y="-174.8" font-family="Times,serif" font-size="14.00">&#45;&gt; FILTER_END</text>
-</g>
-<!-- NeverSkipping.Processing&#45;&gt;NeverSkipping.Idle -->
-<g id="edge8" class="edge">
-<title>NeverSkipping.Processing&#45;&gt;NeverSkipping.Idle</title>
-<path fill="none" stroke="black" d="M129.49,-270.27C134.87,-275.48 140.18,-281.55 144,-288 153.56,-304.17 159.09,-324.63 162.21,-340.81"/>
-<polygon fill="black" stroke="black" points="158.78,-341.49 163.94,-350.74 165.68,-340.29 158.78,-341.49"/>
-<text text-anchor="middle" x="265.5" y="-321.8" font-family="Times,serif" font-size="14.00">[nKeys &lt; maxKeys]</text>
-<text text-anchor="middle" x="265.5" y="-306.8" font-family="Times,serif" font-size="14.00">/ Contents.append(key, value)</text>
-<text text-anchor="middle" x="265.5" y="-291.8" font-family="Times,serif" font-size="14.00"> &#45;&gt; FILTER_ACCEPT</text>
-</g>
-<!-- NotSkippingPrefix.Processing&#45;&gt;END -->
-<g id="edge9" class="edge">
-<title>NotSkippingPrefix.Processing&#45;&gt;END</title>
-<path fill="none" stroke="black" d="M349.96,-237.93C333,-232.81 316.36,-225.74 302,-216 275.27,-197.87 285.01,-177.6 261,-156 247.64,-143.98 229.41,-134.62 215.65,-128.62"/>
-<polygon fill="black" stroke="black" points="216.74,-125.28 206.16,-124.7 214.07,-131.75 216.74,-125.28"/>
-<text text-anchor="middle" x="378" y="-189.8" font-family="Times,serif" font-size="14.00">[nKeys == maxKeys]</text>
-<text text-anchor="middle" x="378" y="-174.8" font-family="Times,serif" font-size="14.00"> &#45;&gt; FILTER_END</text>
-</g>
-<!-- NotSkippingPrefix.Processing&#45;&gt;NotSkippingPrefix.Idle -->
-<g id="edge11" class="edge">
-<title>NotSkippingPrefix.Processing&#45;&gt;NotSkippingPrefix.Idle</title>
-<path fill="none" stroke="black" d="M499.64,-270.11C506.59,-274.86 512.87,-280.76 517,-288 526.9,-305.38 528.94,-316.96 517,-333 513.56,-337.62 509.53,-341.66 505.07,-345.18"/>
-<polygon fill="black" stroke="black" points="502.89,-342.43 496.63,-350.98 506.85,-348.2 502.89,-342.43"/>
-<text text-anchor="middle" x="690.5" y="-321.8" font-family="Times,serif" font-size="14.00">[nKeys &lt; maxKeys and not hasDelimiter(key)]</text>
-<text text-anchor="middle" x="690.5" y="-306.8" font-family="Times,serif" font-size="14.00">/ Contents.append(key, value)</text>
-<text text-anchor="middle" x="690.5" y="-291.8" font-family="Times,serif" font-size="14.00"> &#45;&gt; FILTER_ACCEPT</text>
-</g>
-<!-- NotSkippingPrefix.Processing&#45;&gt;SkippingPrefix.Idle -->
-<g id="edge10" class="edge">
-<title>NotSkippingPrefix.Processing&#45;&gt;SkippingPrefix.Idle</title>
-<path fill="none" stroke="black" d="M458,-233.74C458,-211.98 458,-174.32 458,-148.56"/>
-<polygon fill="black" stroke="black" points="461.5,-148.33 458,-138.33 454.5,-148.33 461.5,-148.33"/>
-<text text-anchor="middle" x="609.5" y="-204.8" font-family="Times,serif" font-size="14.00">[nKeys &lt; maxKeys and hasDelimiter(key)]</text>
-<text text-anchor="middle" x="609.5" y="-189.8" font-family="Times,serif" font-size="14.00">/ prefix &lt;&#45; prefixOf(key)</text>
-<text text-anchor="middle" x="609.5" y="-174.8" font-family="Times,serif" font-size="14.00">/ CommonPrefixes.append(prefixOf(key))</text>
-<text text-anchor="middle" x="609.5" y="-159.8" font-family="Times,serif" font-size="14.00">&#45;&gt; FILTER_ACCEPT</text>
-</g>
-<!-- SkippingPrefix.Processing&#45;&gt;SkippingPrefix.Idle -->
-<g id="edge12" class="edge">
-<title>SkippingPrefix.Processing&#45;&gt;SkippingPrefix.Idle</title>
-<path fill="none" stroke="black" d="M593.49,-36.23C591.32,-50.84 586,-71.39 573,-84 567.75,-89.09 561.77,-93.45 555.38,-97.17"/>
-<polygon fill="black" stroke="black" points="553.66,-94.12 546.43,-101.87 556.91,-100.32 553.66,-94.12"/>
-<text text-anchor="middle" x="672" y="-72.8" font-family="Times,serif" font-size="14.00">[key.startsWith(prefix)]</text>
-<text text-anchor="middle" x="672" y="-57.8" font-family="Times,serif" font-size="14.00">&#45;&gt; FILTER_SKIP</text>
-</g>
-<!-- SkippingPrefix.Processing&#45;&gt;NotSkippingPrefix.Processing -->
-<g id="edge13" class="edge">
-<title>SkippingPrefix.Processing&#45;&gt;NotSkippingPrefix.Processing</title>
-<path fill="none" stroke="black" d="M703.16,-31.64C728.6,-36.87 750.75,-44.11 759,-54 778.46,-77.34 776.26,-200.01 762,-216 749.37,-230.17 656.13,-239.42 576.2,-244.84"/>
-<polygon fill="black" stroke="black" points="575.77,-241.36 566.03,-245.51 576.24,-248.34 575.77,-241.36"/>
-<text text-anchor="middle" x="870" y="-116.3" font-family="Times,serif" font-size="14.00">[not key.startsWith(prefix)]</text>
-</g>
-</g>
-</svg>
--- a/index.ts
+++ b/index.ts
@ -1,9 +1,6 @@
 import * as evaluators from './lib/policyEvaluator/evaluator';
 import evaluatePrincipal from './lib/policyEvaluator/principal';
-import RequestContext, {
-    actionNeedQuotaCheck,
-    actionNeedQuotaCheckCopy,
-    actionWithDataDeletion } from './lib/policyEvaluator/RequestContext';
+import RequestContext from './lib/policyEvaluator/RequestContext';
 import * as requestUtils from './lib/policyEvaluator/requestUtils';
 import * as actionMaps from './lib/policyEvaluator/utils/actionMaps';
 import { validateUserPolicy } from './lib/policy/policyValidator'
@ -28,7 +25,6 @@ import * as objectRestore from './lib/s3middleware/objectRestore';
 import * as lifecycleHelpers from './lib/s3middleware/lifecycleHelpers';
 export { default as errors } from './lib/errors';
 export { default as Clustering } from './lib/Clustering';
-export * as ClusterRPC from './lib/clustering/ClusterRPC';
 export * as ipCheck from './lib/ipCheck';
 export * as auth from './lib/auth/auth';
 export * as constants from './lib/constants';
@ -52,8 +48,6 @@ export const algorithms = {
        Skip: require('./lib/algos/list/skip'),
    },
    cache: {
-        GapSet: require('./lib/algos/cache/GapSet'),
-        GapCache: require('./lib/algos/cache/GapCache'),
        LRUCache: require('./lib/algos/cache/LRUCache'),
    },
    stream: {
@ -70,9 +64,6 @@ export const policies = {
    RequestContext,
    requestUtils,
    actionMaps,
-    actionNeedQuotaCheck,
-    actionWithDataDeletion,
-    actionNeedQuotaCheckCopy,
 };

 export const testing = {
--- a/lib/algos/cache/GapCache.ts
+++ b/lib/algos/cache/GapCache.ts
@ -1,363 +0,0 @@
-import { OrderedSet } from '@js-sdsl/ordered-set';
-import {
-    default as GapSet,
-    GapSetEntry,
-} from './GapSet';
-
-// the API is similar but is not strictly a superset of GapSetInterface
-// so we don't extend from it
-export interface GapCacheInterface {
-    exposureDelayMs: number;
-    maxGapWeight: number;
-    size: number;
-
-    setGap: (firstKey: string, lastKey: string, weight: number) => void;
-    removeOverlappingGaps: (overlappingKeys: string[]) => number;
-    lookupGap: (minKey: string, maxKey?: string) => Promise<GapSetEntry | null>;
-    [Symbol.iterator]: () => Iterator<GapSetEntry>;
-    toArray: () => GapSetEntry[];
-};
-
-class GapCacheUpdateSet {
-    newGaps: GapSet;
-    updatedKeys: OrderedSet<string>;
-
-    constructor(maxGapWeight: number) {
-        this.newGaps = new GapSet(maxGapWeight);
-        this.updatedKeys = new OrderedSet();
-    }
-
-    addUpdateBatch(updatedKeys: OrderedSet<string>): void {
-        this.updatedKeys.union(updatedKeys);
-    }
-};
-
-/**
- * Cache of listing "gaps" i.e. ranges of keys that can be skipped
- * over during listing (because they only contain delete markers as
- * latest versions).
- *
- * Typically, a single GapCache instance would be attached to a raft session.
- *
- * The API usage is as follows:
- *
- * - Initialize a GapCache instance by calling start() (this starts an internal timer)
- *
- * - Insert a gap or update an existing one via setGap()
- *
- * - Lookup existing gaps via lookupGap()
- *
- * - Invalidate gaps that overlap a specific set of keys via removeOverlappingGaps()
- *
- * - Shut down a GapCache instance by calling stop() (this stops the internal timer)
- *
- * Gaps inserted via setGap() are not exposed immediately to lookupGap(), but only:
- *
- * - after a certain delay always larger than 'exposureDelayMs' and usually shorter
- *   than twice this value (but might be slightly longer in rare cases)
- *
- * - and only if they haven't been invalidated by a recent call to removeOverlappingGaps()
- *
- * This ensures atomicity between gap creation and invalidation from updates under
- * the condition that a gap is created from first key to last key within the time defined
- * by 'exposureDelayMs'.
- *
- * The implementation is based on two extra temporary "update sets" on top of the main
- * exposed gap set, one called "staging" and the other "frozen", each containing a
- * temporary updated gap set and a list of updated keys to invalidate gaps with (coming
- * from calls to removeOverlappingGaps()). Every "exposureDelayMs" milliseconds, the frozen
- * gaps are invalidated by all key updates coming from either of the "staging" or "frozen"
- * update set, then merged into the exposed gaps set, after which the staging updates become
- * the frozen updates and won't receive any new gap until the next cycle.
- */
-export default class GapCache implements GapCacheInterface {
-    _exposureDelayMs: number;
-    maxGaps: number;
-
-    _stagingUpdates: GapCacheUpdateSet;
-    _frozenUpdates: GapCacheUpdateSet;
-    _exposedGaps: GapSet;
-    _exposeFrozenInterval: NodeJS.Timeout | null;
-
-    /**
-     * @constructor
-     *
-     * @param {number} exposureDelayMs - minimum delay between
-     * insertion of a gap via setGap() and its exposure via
-     * lookupGap()
-     * @param {number} maxGaps - maximum number of cached gaps, after
-     * which no new gap can be added by setGap(). (Note: a future
-     * improvement could replace this by an eviction strategy)
-     * @param {number} maxGapWeight - maximum "weight" of individual
-     * cached gaps, which is also the granularity for
-     * invalidation. Individual gaps can be chained together,
-     * which lookupGap() transparently consolidates in the response
-     * into a single large gap.
-     */
-    constructor(exposureDelayMs: number, maxGaps: number, maxGapWeight: number) {
-        this._exposureDelayMs = exposureDelayMs;
-        this.maxGaps = maxGaps;
-
-        this._stagingUpdates = new GapCacheUpdateSet(maxGapWeight);
-        this._frozenUpdates = new GapCacheUpdateSet(maxGapWeight);
-        this._exposedGaps = new GapSet(maxGapWeight);
-        this._exposeFrozenInterval = null;
-    }
-
-    /**
-     * Create a GapCache from an array of exposed gap entries (used in tests)
-     *
-     * @return {GapCache} - a new GapCache instance
-     */
-    static createFromArray(
-        gaps: GapSetEntry[],
-        exposureDelayMs: number,
-        maxGaps: number,
-        maxGapWeight: number
-    ): GapCache {
-        const gapCache = new GapCache(exposureDelayMs, maxGaps, maxGapWeight);
-        gapCache._exposedGaps = GapSet.createFromArray(gaps, maxGapWeight)
-        return gapCache;
-    }
-
-    /**
-     * Internal helper to remove gaps in the staging and frozen sets
-     * overlapping with previously updated keys, right before the
-     * frozen gaps get exposed.
-     *
-     * @return {undefined}
-     */
-    _removeOverlappingGapsBeforeExpose(): void {
-        for (const { updatedKeys } of [this._stagingUpdates, this._frozenUpdates]) {
-            if (updatedKeys.size() === 0) {
-                continue;
-            }
-            for (const { newGaps } of [this._stagingUpdates, this._frozenUpdates]) {
-                if (newGaps.size === 0) {
-                    continue;
-                }
-                newGaps.removeOverlappingGaps(updatedKeys);
-            }
-        }
-    }
-
-    /**
-     * This function is the core mechanism that updates the exposed gaps in the
-     * cache. It is called on a regular interval defined by 'exposureDelayMs'.
-     *
-     * It does the following in order:
-     *
-     * - remove gaps from the frozen set that overlap with any key present in a
-     *   batch passed to removeOverlappingGaps() since the last two triggers of
-     *   _exposeFrozen()
-     *
-     * - merge the remaining gaps from the frozen set to the exposed set, which
-     *   makes them visible from calls to lookupGap()
-     *
-     * - rotate by freezing the currently staging updates and initiating a new
-     *   staging updates set
-     *
-     * @return {undefined}
-     */
-    _exposeFrozen(): void {
-        this._removeOverlappingGapsBeforeExpose();
-        for (const gap of this._frozenUpdates.newGaps) {
-            // Use a trivial strategy to keep the cache size within
-            // limits: refuse to add new gaps when the size is above
-            // the 'maxGaps' threshold. We solely rely on
-            // removeOverlappingGaps() to make space for new gaps.
-            if (this._exposedGaps.size < this.maxGaps) {
-                this._exposedGaps.setGap(gap.firstKey, gap.lastKey, gap.weight);
-            }
-        }
-        this._frozenUpdates = this._stagingUpdates;
-        this._stagingUpdates = new GapCacheUpdateSet(this.maxGapWeight);
-    }
-
-    /**
-     * Start the internal GapCache timer
-     *
-     * @return {undefined}
-     */
-    start(): void {
-        if (this._exposeFrozenInterval) {
-            return;
-        }
-        this._exposeFrozenInterval = setInterval(
-            () => this._exposeFrozen(),
-            this._exposureDelayMs);
-    }
-
-    /**
-     * Stop the internal GapCache timer
-     *
-     * @return {undefined}
-     */
-    stop(): void {
-        if (this._exposeFrozenInterval) {
-            clearInterval(this._exposeFrozenInterval);
-            this._exposeFrozenInterval = null;
-        }
-    }
-
-    /**
-     * Record a gap between two keys, associated with a weight to
-     * limit individual gap's spanning ranges in the cache, for a more
-     * granular invalidation.
-     *
-     * The function handles splitting and merging existing gaps to
-     * maintain an optimal weight of cache entries.
-     *
-     * NOTE 1: the caller must ensure that the full length of the gap
-     * between 'firstKey' and 'lastKey' has been built from a listing
-     * snapshot that is more recent than 'exposureDelayMs' milliseconds,
-     * in order to guarantee that the exposed gap will be fully
-     * covered (and potentially invalidated) from recent calls to
-     * removeOverlappingGaps().
-     *
-     * NOTE 2: a usual pattern when building a large gap from multiple
-     * calls to setGap() is to start the next gap from 'lastKey',
-     * which will be passed as 'firstKey' in the next call, so that
-     * gaps can be chained together and consolidated by lookupGap().
-     *
-     * @param {string} firstKey - first key of the gap
-     * @param {string} lastKey - last key of the gap, must be greater
-     * or equal than 'firstKey'
-     * @param {number} weight - total weight between 'firstKey' and 'lastKey'
-     * @return {undefined}
-     */
-    setGap(firstKey: string, lastKey: string, weight: number): void {
-        this._stagingUpdates.newGaps.setGap(firstKey, lastKey, weight);
-    }
-
-    /**
-     * Remove gaps that overlap with a given set of keys. Used to
-     * invalidate gaps when keys are inserted or deleted.
-     *
-     * @param {OrderedSet<string> | string[]} overlappingKeys - remove gaps that
-     * overlap with any of this set of keys
-     * @return {number} - how many gaps were removed from the exposed
-     * gaps only (overlapping gaps not yet exposed are also invalidated
-     * but are not accounted for in the returned value)
-     */
-    removeOverlappingGaps(overlappingKeys: OrderedSet<string> | string[]): number {
-        let overlappingKeysSet;
-        if (Array.isArray(overlappingKeys)) {
-            overlappingKeysSet = new OrderedSet(overlappingKeys);
-        } else {
-            overlappingKeysSet = overlappingKeys;
-        }
-        this._stagingUpdates.addUpdateBatch(overlappingKeysSet);
-        return this._exposedGaps.removeOverlappingGaps(overlappingKeysSet);
-    }
-
-    /**
-     * Lookup the next exposed gap that overlaps with [minKey, maxKey]. Internally
-     * chained gaps are coalesced in the response into a single contiguous large gap.
-     *
-     * @param {string} minKey - minimum key overlapping with the returned gap
-     * @param {string} [maxKey] - maximum key overlapping with the returned gap
-     * @return {Promise<GapSetEntry | null>} - result of the lookup if a gap
-     *   was found, null otherwise, as a Promise
-     */
-    lookupGap(minKey: string, maxKey?: string): Promise<GapSetEntry | null> {
-        return this._exposedGaps.lookupGap(minKey, maxKey);
-    }
-
-    /**
-     * Get the maximum weight setting for individual gaps.
-     *
-     * @return {number} - maximum weight of individual gaps
-     */
-    get maxGapWeight(): number {
-        return this._exposedGaps.maxWeight;
-    }
-
-    /**
-     * Set the maximum weight setting for individual gaps.
-     *
-     * @param {number} gapWeight - maximum weight of individual gaps
-     */
-    set maxGapWeight(gapWeight: number) {
-        this._exposedGaps.maxWeight = gapWeight;
-        // also update transient gap sets
-        this._stagingUpdates.newGaps.maxWeight = gapWeight;
-        this._frozenUpdates.newGaps.maxWeight = gapWeight;
-    }
-
-    /**
-     * Get the exposure delay in milliseconds, which is the minimum
-     * time after which newly cached gaps will be exposed by
-     * lookupGap().
-     *
-     * @return {number} - exposure delay in milliseconds
-     */
-    get exposureDelayMs(): number {
-        return this._exposureDelayMs;
-    }
-
-    /**
-     * Set the exposure delay in milliseconds, which is the minimum
-     * time after which newly cached gaps will be exposed by
-     * lookupGap(). Setting this attribute automatically updates the
-     * internal state to honor the new value.
-     *
-     * @param {number} - exposure delay in milliseconds
-     */
-    set exposureDelayMs(exposureDelayMs: number) {
-        if (exposureDelayMs !== this._exposureDelayMs) {
-            this._exposureDelayMs = exposureDelayMs;
-            if (this._exposeFrozenInterval) {
-                // invalidate all pending gap updates, as the new interval may not be
-                // safe for them
-                this._stagingUpdates = new GapCacheUpdateSet(this.maxGapWeight);
-                this._frozenUpdates = new GapCacheUpdateSet(this.maxGapWeight);
-
-                // reinitialize the _exposeFrozenInterval timer with the updated delay
-                this.stop();
-                this.start();
-            }
-        }
-    }
-
-    /**
-     * Get the number of exposed gaps
-     *
-     * @return {number} number of exposed gaps
-     */
-    get size(): number {
-        return this._exposedGaps.size;
-    }
-
-    /**
-     * Iterate over exposed gaps
-     *
-     * @return {Iterator<GapSetEntry>} an iterator over exposed gaps
-     */
-    [Symbol.iterator](): Iterator<GapSetEntry> {
-        return this._exposedGaps[Symbol.iterator]();
-    }
-
-    /**
-     * Get an array of all exposed gaps
-     *
-     * @return {GapSetEntry[]} array of exposed gaps
-     */
-    toArray(): GapSetEntry[] {
-        return this._exposedGaps.toArray();
-    }
-
-    /**
-     * Clear all exposed and staging gaps from the cache.
-     *
-     * Note: retains invalidating updates from removeOverlappingGaps()
-     * for correctness of gaps inserted afterwards.
-     *
-     * @return {undefined}
-     */
-    clear(): void {
-        this._stagingUpdates.newGaps = new GapSet(this.maxGapWeight);
-        this._frozenUpdates.newGaps = new GapSet(this.maxGapWeight);
-        this._exposedGaps = new GapSet(this.maxGapWeight);
-    }
-}
--- a/lib/algos/cache/GapSet.ts
+++ b/lib/algos/cache/GapSet.ts
@ -1,366 +0,0 @@
-import assert from 'assert';
-import { OrderedSet } from '@js-sdsl/ordered-set';
-
-import errors from '../../errors';
-
-export type GapSetEntry = {
-    firstKey: string,
-    lastKey: string,
-    weight: number,
-};
-
-export interface GapSetInterface {
-    maxWeight: number;
-    size: number;
-
-    setGap: (firstKey: string, lastKey: string, weight: number) => GapSetEntry;
-    removeOverlappingGaps: (overlappingKeys: string[]) => number;
-    lookupGap: (minKey: string, maxKey?: string) => Promise<GapSetEntry | null>;
-    [Symbol.iterator]: () => Iterator<GapSetEntry>;
-    toArray: () => GapSetEntry[];
-};
-
-/**
- * Specialized data structure to support caching of listing "gaps",
- * i.e. ranges of keys that can be skipped over during listing
- * (because they only contain delete markers as latest versions)
- */
-export default class GapSet implements GapSetInterface, Iterable<GapSetEntry> {
-    _gaps: OrderedSet<GapSetEntry>;
-    _maxWeight: number;
-
-    /**
-     * @constructor
-
-     * @param {number} maxWeight - weight threshold for each cached
-     * gap (unitless). Triggers splitting gaps when reached
-     */
-    constructor(maxWeight: number) {
-        this._gaps = new OrderedSet(
-            [],
-            (left: GapSetEntry, right: GapSetEntry) => (
-                left.firstKey < right.firstKey ? -1 :
-                left.firstKey > right.firstKey ? 1 : 0
-            )
-        );
-        this._maxWeight = maxWeight;
-    }
-
-    /**
-     * Create a GapSet from an array of gap entries (used in tests)
-     */
-    static createFromArray(gaps: GapSetEntry[], maxWeight: number): GapSet {
-        const gapSet = new GapSet(maxWeight);
-        for (const gap of gaps) {
-            gapSet._gaps.insert(gap);
-        }
-        return gapSet;
-    }
-
-    /**
-     * Record a gap between two keys, associated with a weight to limit
-     * individual gap sizes in the cache.
-     *
-     * The function handles splitting and merging existing gaps to
-     * maintain an optimal weight of cache entries.
-     *
-     * @param {string} firstKey - first key of the gap
-     * @param {string} lastKey - last key of the gap, must be greater
-     * or equal than 'firstKey'
-     * @param {number} weight - total weight between 'firstKey' and 'lastKey'
-     * @return {GapSetEntry} - existing or new gap entry
-     */
-    setGap(firstKey: string, lastKey: string, weight: number): GapSetEntry {
-        assert(lastKey >= firstKey);
-
-        // Step 1/4: Find the closest left-overlapping gap, and either re-use it
-        // or chain it with a new gap depending on the weights if it exists (otherwise
-        // just creates a new gap).
-        const curGapIt = this._gaps.reverseLowerBound(<GapSetEntry>{ firstKey });
-        let curGap;
-        if (curGapIt.isAccessible()) {
-            curGap = curGapIt.pointer;
-            if (curGap.lastKey >= lastKey) {
-                // return fully overlapping gap already cached
-                return curGap;
-            }
-        }
-        let remainingWeight = weight;
-        if (!curGap                         // no previous gap
-            || curGap.lastKey < firstKey    // previous gap not overlapping
-            || (curGap.lastKey === firstKey // previous gap overlapping by one key...
-                && curGap.weight + weight > this._maxWeight) // ...but we can't extend it
-           ) {
-            // create a new gap indexed by 'firstKey'
-            curGap = { firstKey, lastKey: firstKey, weight: 0 };
-            this._gaps.insert(curGap);
-        } else if (curGap.lastKey > firstKey && weight > this._maxWeight) {
-            // previous gap is either fully or partially contained in the new gap
-            // and cannot be extended: substract its weight from the total (heuristic
-            // in case the previous gap doesn't start at 'firstKey', which is the
-            // uncommon case)
-            remainingWeight -= curGap.weight;
-
-            // there may be an existing chained gap starting with the previous gap's
-            // 'lastKey': use it if it exists
-            const chainedGapIt = this._gaps.find(<GapSetEntry>{ firstKey: curGap.lastKey });
-            if (chainedGapIt.isAccessible()) {
-                curGap = chainedGapIt.pointer;
-            } else {
-                // no existing chained gap: chain a new gap to the previous gap
-                curGap = {
-                    firstKey: curGap.lastKey,
-                    lastKey: curGap.lastKey,
-                    weight: 0,
-                };
-                this._gaps.insert(curGap);
-            }
-        }
-        // Step 2/4: Cleanup existing gaps fully included in firstKey -> lastKey, and
-        // aggregate their weights in curGap to define the minimum weight up to the
-        // last merged gap.
-        let nextGap;
-        while (true) {
-            const nextGapIt = this._gaps.upperBound(<GapSetEntry>{ firstKey: curGap.firstKey });
-            nextGap = nextGapIt.isAccessible() && nextGapIt.pointer;
-            // stop the cleanup when no more gap or if the next gap is not fully
-            // included in curGap
-            if (!nextGap || nextGap.lastKey > lastKey) {
-                break;
-            }
-            this._gaps.eraseElementByIterator(nextGapIt);
-            curGap.lastKey = nextGap.lastKey;
-            curGap.weight += nextGap.weight;
-        }
-
-        // Step 3/4: Extend curGap to lastKey, adjusting the weight.
-        // At this point, curGap weight is the minimum weight of the finished gap, save it
-        // for step 4.
-        let minMergedWeight = curGap.weight;
-        if (curGap.lastKey === firstKey && firstKey !== lastKey) {
-            // extend the existing gap by the full amount 'firstKey -> lastKey'
-            curGap.lastKey = lastKey;
-            curGap.weight += remainingWeight;
-        } else if (curGap.lastKey <= lastKey) {
-            curGap.lastKey = lastKey;
-            curGap.weight = remainingWeight;
-        }
-
-        // Step 4/4: Find the closest right-overlapping gap, and if it exists, either merge
-        // it or chain it with curGap depending on the weights.
-        if (nextGap && nextGap.firstKey <= lastKey) {
-            // nextGap overlaps with the new gap: check if we can merge it
-            minMergedWeight += nextGap.weight;
-            let mergedWeight;
-            if (lastKey === nextGap.firstKey) {
-                // nextGap is chained with curGap: add the full weight of nextGap
-                mergedWeight = curGap.weight + nextGap.weight;
-            } else {
-                // strict overlap: don't add nextGap's weight unless
-                // it's larger than the sum of merged ranges (as it is
-                // then included in `minMergedWeight`)
-                mergedWeight = Math.max(curGap.weight, minMergedWeight);
-            }
-            if (mergedWeight <= this._maxWeight) {
-                // merge nextGap into curGap
-                curGap.lastKey = nextGap.lastKey;
-                curGap.weight = mergedWeight;
-                this._gaps.eraseElementByKey(nextGap);
-            } else {
-                // adjust the last key to chain with nextGap and substract the next
-                // gap's weight from curGap (heuristic)
-                curGap.lastKey = nextGap.firstKey;
-                curGap.weight = Math.max(mergedWeight - nextGap.weight, 0);
-                curGap = nextGap;
-            }
-        }
-        // return a copy of curGap
-        return Object.assign({}, curGap);
-    }
-
-    /**
-     * Remove gaps that overlap with one or more keys in a given array or
-     * OrderedSet. Used to invalidate gaps when keys are inserted or deleted.
-     *
-     * @param {OrderedSet<string> | string[]} overlappingKeys - remove gaps that overlap
-     * with any of this set of keys
-     * @return {number} - how many gaps were removed
-     */
-    removeOverlappingGaps(overlappingKeys: OrderedSet<string> | string[]): number {
-        // To optimize processing with a large number of keys and/or gaps, this function:
-        //
-        // 1. converts the overlappingKeys array to a OrderedSet (if not already a OrderedSet)
-        // 2. queries both the gaps set and the overlapping keys set in a loop, which allows:
-        //    - skipping ranges of overlapping keys at once when there is no new overlapping gap
-        //    - skipping ranges of gaps at once when there is no overlapping key
-        //
-        // This way, it is efficient when the number of non-overlapping gaps is large
-        // (which is the most common case in practice).
-
-        let overlappingKeysSet;
-        if (Array.isArray(overlappingKeys)) {
-            overlappingKeysSet = new OrderedSet(overlappingKeys);
-        } else {
-            overlappingKeysSet = overlappingKeys;
-        }
-        const firstKeyIt = overlappingKeysSet.begin();
-        let currentKey = firstKeyIt.isAccessible() && firstKeyIt.pointer;
-        let nRemoved = 0;
-        while (currentKey) {
-            const closestGapIt = this._gaps.reverseUpperBound(<GapSetEntry>{ firstKey: currentKey });
-            if (closestGapIt.isAccessible()) {
-                const closestGap = closestGapIt.pointer;
-                if (currentKey <= closestGap.lastKey) {
-                    // currentKey overlaps closestGap: remove the gap
-                    this._gaps.eraseElementByIterator(closestGapIt);
-                    nRemoved += 1;
-                }
-            }
-            const nextGapIt = this._gaps.lowerBound(<GapSetEntry>{ firstKey: currentKey });
-            if (!nextGapIt.isAccessible()) {
-                // no more gap: we're done
-                return nRemoved;
-            }
-            const nextGap = nextGapIt.pointer;
-            // advance to the last key potentially overlapping with nextGap
-            let currentKeyIt = overlappingKeysSet.reverseLowerBound(nextGap.lastKey);
-            if (currentKeyIt.isAccessible()) {
-                currentKey = currentKeyIt.pointer;
-                if (currentKey >= nextGap.firstKey) {
-                    // currentKey overlaps nextGap: remove the gap
-                    this._gaps.eraseElementByIterator(nextGapIt);
-                    nRemoved += 1;
-                }
-            }
-            // advance to the first key potentially overlapping with another gap
-            currentKeyIt = overlappingKeysSet.lowerBound(nextGap.lastKey);
-            currentKey = currentKeyIt.isAccessible() && currentKeyIt.pointer;
-        }
-        return nRemoved;
-    }
-
-    /**
-     * Internal helper to coalesce multiple chained gaps into a single gap.
-     *
-     * It is only used to construct lookupGap() return values and
-     * doesn't modify the GapSet.
-     *
-     * NOTE: The function may take a noticeable amount of time and CPU
-     * to execute if a large number of chained gaps have to be
-     * coalesced, but it should never take more than a few seconds. In
-     * most cases it should take less than a millisecond. It regularly
-     * yields to the nodejs event loop to avoid blocking it during a
-     * long execution.
-     *
-     * @param {GapSetEntry} firstGap - first gap of the chain to coalesce with
-     * the next ones in the chain
-     * @return {Promise<GapSetEntry>} - a new coalesced entry, as a Promise
-     */
-    _coalesceGapChain(firstGap: GapSetEntry): Promise<GapSetEntry> {
-        return new Promise(resolve => {
-            const coalescedGap: GapSetEntry = Object.assign({}, firstGap);
-            const coalesceGapChainIteration = () => {
-                // efficiency trade-off: 100 iterations of log(N) complexity lookups should
-                // not block the event loop for too long
-                for (let opCounter = 0; opCounter < 100; ++opCounter) {
-                    const chainedGapIt = this._gaps.find(
-                            <GapSetEntry>{ firstKey: coalescedGap.lastKey });
-                    if (!chainedGapIt.isAccessible()) {
-                        // chain is complete
-                        return resolve(coalescedGap);
-                    }
-                    const chainedGap = chainedGapIt.pointer;
-                    if (chainedGap.firstKey === chainedGap.lastKey) {
-                        // found a single-key gap: chain is complete
-                        return resolve(coalescedGap);
-                    }
-                    coalescedGap.lastKey = chainedGap.lastKey;
-                    coalescedGap.weight += chainedGap.weight;
-                }
-                // yield to the event loop before continuing the process
-                // of coalescing the gap chain
-                return process.nextTick(coalesceGapChainIteration);
-            };
-            coalesceGapChainIteration();
-        });
-    }
-
-    /**
-     * Lookup the next gap that overlaps with [minKey, maxKey]. Internally chained
-     * gaps are coalesced in the response into a single contiguous large gap.
-     *
-     * @param {string} minKey - minimum key overlapping with the returned gap
-     * @param {string} [maxKey] - maximum key overlapping with the returned gap
-     * @return {Promise<GapSetEntry | null>} - result of the lookup if a gap
-     *   was found, null otherwise, as a Promise
-     */
-    async lookupGap(minKey: string, maxKey?: string): Promise<GapSetEntry | null> {
-        let firstGap: GapSetEntry | null = null;
-        const minGapIt = this._gaps.reverseLowerBound(<GapSetEntry>{ firstKey: minKey });
-        const minGap = minGapIt.isAccessible() && minGapIt.pointer;
-        if (minGap && minGap.lastKey >= minKey) {
-            firstGap = minGap;
-        } else {
-            const maxGapIt = this._gaps.upperBound(<GapSetEntry>{ firstKey: minKey });
-            const maxGap = maxGapIt.isAccessible() && maxGapIt.pointer;
-            if (maxGap && (maxKey === undefined || maxGap.firstKey <= maxKey)) {
-                firstGap = maxGap;
-            }
-        }
-        if (!firstGap) {
-            return null;
-        }
-        return this._coalesceGapChain(firstGap);
-    }
-
-    /**
-     * Get the maximum weight setting for individual gaps.
-     *
-     * @return {number} - maximum weight of individual gaps
-     */
-    get maxWeight(): number {
-        return this._maxWeight;
-    }
-
-    /**
-     * Set the maximum weight setting for individual gaps.
-     *
-     * @param {number} gapWeight - maximum weight of individual gaps
-     */
-    set maxWeight(gapWeight: number) {
-        this._maxWeight = gapWeight;
-    }
-
-    /**
-     * Get the number of gaps stored in this set.
-     *
-     * @return {number} - number of gaps stored in this set
-     */
-    get size(): number {
-        return this._gaps.size();
-    }
-
-    /**
-     * Iterate over each gap of the set, ordered by first key
-     *
-     * @return {Iterator<GapSetEntry>} - an iterator over all gaps
-     *   Example:
-     *     for (const gap of myGapSet) { ... }
-     */
-    [Symbol.iterator](): Iterator<GapSetEntry> {
-        return this._gaps[Symbol.iterator]();
-    }
-
-    /**
-     * Return an array containing all gaps, ordered by first key
-     *
-     * NOTE: there is a toArray() method in the OrderedSet implementation
-     * but it does not scale well and overflows the stack quickly. This is
-     * why we provide an implementation based on an iterator.
-     *
-     * @return {GapSetEntry[]} - an array containing all gaps
-     */
-    toArray(): GapSetEntry[] {
-        return [...this];
-    }
-}
--- a/lib/algos/list/Extension.js
+++ b/lib/algos/list/Extension.js
@ -1,6 +1,6 @@
 'use strict'; // eslint-disable-line strict

-const { FILTER_ACCEPT, SKIP_NONE } = require('./tools');
+const { FILTER_SKIP, SKIP_NONE } = require('./tools');

 // Use a heuristic to amortize the cost of JSON
 // serialization/deserialization only on largest metadata where the
@ -92,26 +92,21 @@ class Extension {
     * @param {object} entry - a listing entry from metadata
     *                         expected format: { key, value }
     * @return {number} - result of filtering the entry:
-     *                    FILTER_ACCEPT: entry is accepted and may or not be included
-     *                                   in the result
-     *                    FILTER_SKIP: listing may skip directly (with "gte" param) to
-     *                                 the key returned by the skipping() method
-     *                    FILTER_END: the results are complete, listing can be stopped
+     *                    > 0: entry is accepted and included in the result
+     *                    = 0: entry is accepted but not included (skipping)
+     *                    < 0: entry is not accepted, listing should finish
     */
-    filter(/* entry: { key, value } */) {
-        return FILTER_ACCEPT;
+    filter(entry) {
+        return entry ? FILTER_SKIP : FILTER_SKIP;
    }

    /**
-     * Provides the next key at which the listing task is allowed to skip to.
-     * This could allow to skip over:
-     * - a key prefix ending with the delimiter
-     * - all remaining versions of an object when doing a current
-     *   versions listing in v0 format
-     * - a cached "gap" of deleted objects when doing a current
-     *   versions listing in v0 format
+     * Provides the insight into why filter is skipping an entry. This could be
+     * because it is skipping a range of delimited keys or a range of specific
+     * version when doing master version listing.
     *
-     * @return {string} - the next key at which the listing task is allowed to skip to
+     * @return {string} - the insight: a common prefix or a master key,
+     *                                 or SKIP_NONE if there is no insight
     */
    skipping() {
        return SKIP_NONE;
--- a/lib/algos/list/MPU.js
+++ b/lib/algos/list/MPU.js
@ -1,7 +1,7 @@
 'use strict'; // eslint-disable-line strict

 const { inc, checkLimit, listingParamsMasterKeysV0ToV1,
-    FILTER_END, FILTER_ACCEPT, SKIP_NONE } = require('./tools');
+    FILTER_END, FILTER_ACCEPT } = require('./tools');
 const DEFAULT_MAX_KEYS = 1000;
 const VSConst = require('../../versioning/constants').VersioningConstants;
 const { DbPrefixes, BucketVersioningKeyFormat } = VSConst;
@ -163,7 +163,7 @@ class MultipartUploads {
    }

    skipping() {
-        return SKIP_NONE;
+        return '';
    }

    /**
--- a/lib/algos/list/basic.js
+++ b/lib/algos/list/basic.js
@ -2,7 +2,7 @@

 const Extension = require('./Extension').default;

-const { checkLimit, FILTER_END, FILTER_ACCEPT } = require('./tools');
+const { checkLimit, FILTER_END, FILTER_ACCEPT, FILTER_SKIP } = require('./tools');
 const DEFAULT_MAX_KEYS = 10000;

 /**
@ -91,7 +91,7 @@ class List extends Extension {
     *                     < 0 : listing done
     */
    filter(elem) {
-        // Check if the result array is full
+        // Check first in case of maxkeys <= 0
        if (this.keys >= this.maxKeys) {
            return FILTER_END;
        }
@ -99,7 +99,7 @@ class List extends Extension {
             this.filterKeyStartsWith !== undefined) &&
            typeof elem === 'object' &&
            !this.customFilter(elem.value)) {
-            return FILTER_ACCEPT;
+            return FILTER_SKIP;
        }
        if (typeof elem === 'object') {
            this.res.push({
--- a/lib/algos/list/delimiter.js
+++ b/lib/algos/list/delimiter.js
@ -0,0 +1,274 @@
+'use strict'; // eslint-disable-line strict
+
+const Extension = require('./Extension').default;
+const { inc, listingParamsMasterKeysV0ToV1,
+    FILTER_END, FILTER_ACCEPT, FILTER_SKIP } = require('./tools');
+const VSConst = require('../../versioning/constants').VersioningConstants;
+const { DbPrefixes, BucketVersioningKeyFormat } = VSConst;
+
+/**
+ * Find the common prefix in the path
+ *
+ * @param {String} key            - path of the object
+ * @param {String} delimiter      - separator
+ * @param {Number} delimiterIndex - 'folder' index in the path
+ * @return {String}               - CommonPrefix
+ */
+function getCommonPrefix(key, delimiter, delimiterIndex) {
+    return key.substring(0, delimiterIndex + delimiter.length);
+}
+
+/**
+ * Handle object listing with parameters
+ *
+ * @prop {String[]} CommonPrefixes     - 'folders' defined by the delimiter
+ * @prop {String[]} Contents           - 'files' to list
+ * @prop {Boolean} IsTruncated         - truncated listing flag
+ * @prop {String|undefined} NextMarker - marker per amazon format
+ * @prop {Number} keys                 - count of listed keys
+ * @prop {String|undefined} delimiter  - separator per amazon format
+ * @prop {String|undefined} prefix     - prefix per amazon format
+ * @prop {Number} maxKeys              - number of keys to list
+ */
+class Delimiter extends Extension {
+    /**
+     * Create a new Delimiter instance
+     * @constructor
+     * @param {Object}  parameters                     - listing parameters
+     * @param {String}  [parameters.delimiter]         - delimiter per amazon
+     *                                                   format
+     * @param {String}  [parameters.prefix]            - prefix per amazon
+     *                                                   format
+     * @param {String}  [parameters.marker]            - marker per amazon
+     *                                                   format
+     * @param {Number}  [parameters.maxKeys]           - number of keys to list
+     * @param {Boolean} [parameters.v2]                - indicates whether v2
+     *                                                   format
+     * @param {String}  [parameters.startAfter]        - marker per amazon
+     *                                                   format
+     * @param {String}  [parameters.continuationToken] - obfuscated amazon
+     *                                                   token
+     * @param {Boolean} [parameters.alphabeticalOrder] - Either the result is
+     *                                                   alphabetically ordered
+     *                                                   or not
+     * @param {RequestLogger} logger                   - The logger of the
+     *                                                   request
+     * @param {String} [vFormat]                       - versioning key format
+     */
+    constructor(parameters, logger, vFormat) {
+        super(parameters, logger);
+        // original listing parameters
+        this.delimiter = parameters.delimiter;
+        this.prefix = parameters.prefix;
+        this.marker = parameters.marker;
+        this.maxKeys = parameters.maxKeys || 1000;
+        this.startAfter = parameters.startAfter;
+        this.continuationToken = parameters.continuationToken;
+        this.alphabeticalOrder =
+          typeof parameters.alphabeticalOrder !== 'undefined' ?
+              parameters.alphabeticalOrder : true;
+
+        this.vFormat = vFormat || BucketVersioningKeyFormat.v0;
+        // results
+        this.CommonPrefixes = [];
+        this.Contents = [];
+        this.IsTruncated = false;
+        this.NextMarker = parameters.marker;
+        this.NextContinuationToken =
+            parameters.continuationToken || parameters.startAfter;
+
+        this.startMarker = parameters.v2 ? 'startAfter' : 'marker';
+        this.continueMarker = parameters.v2 ? 'continuationToken' : 'marker';
+        this.nextContinueMarker = parameters.v2 ?
+            'NextContinuationToken' : 'NextMarker';
+
+        if (this.delimiter !== undefined &&
+            this[this.nextContinueMarker] !== undefined &&
+            this[this.nextContinueMarker].startsWith(this.prefix || '')) {
+            const nextDelimiterIndex =
+                this[this.nextContinueMarker].indexOf(this.delimiter,
+                    this.prefix ? this.prefix.length : 0);
+            this[this.nextContinueMarker] =
+                this[this.nextContinueMarker].slice(0, nextDelimiterIndex +
+                                        this.delimiter.length);
+        }
+
+        Object.assign(this, {
+            [BucketVersioningKeyFormat.v0]: {
+                genMDParams: this.genMDParamsV0,
+                getObjectKey: this.getObjectKeyV0,
+                skipping: this.skippingV0,
+            },
+            [BucketVersioningKeyFormat.v1]: {
+                genMDParams: this.genMDParamsV1,
+                getObjectKey: this.getObjectKeyV1,
+                skipping: this.skippingV1,
+            },
+        }[this.vFormat]);
+    }
+
+    genMDParamsV0() {
+        const params = {};
+        if (this.prefix) {
+            params.gte = this.prefix;
+            params.lt = inc(this.prefix);
+        }
+        const startVal = this[this.continueMarker] || this[this.startMarker];
+        if (startVal) {
+            if (params.gte && params.gte > startVal) {
+                return params;
+            }
+            delete params.gte;
+            params.gt = startVal;
+        }
+        return params;
+    }
+
+    genMDParamsV1() {
+        const params = this.genMDParamsV0();
+        return listingParamsMasterKeysV0ToV1(params);
+    }
+
+    /**
+     * check if the max keys count has been reached and set the
+     * final state of the result if it is the case
+     * @return {Boolean} - indicates if the iteration has to stop
+     */
+    _reachedMaxKeys() {
+        if (this.keys >= this.maxKeys) {
+            // In cases of maxKeys <= 0 -> IsTruncated = false
+            this.IsTruncated = this.maxKeys > 0;
+            return true;
+        }
+        return false;
+    }
+
+    /**
+     *  Add a (key, value) tuple to the listing
+     *  Set the NextMarker to the current key
+     *  Increment the keys counter
+     *  @param {String} key   - The key to add
+     *  @param {String} value - The value of the key
+     *  @return {number}      - indicates if iteration should continue
+     */
+    addContents(key, value) {
+        if (this._reachedMaxKeys()) {
+            return FILTER_END;
+        }
+        this.Contents.push({ key, value: this.trimMetadata(value) });
+        this[this.nextContinueMarker] = key;
+        ++this.keys;
+        return FILTER_ACCEPT;
+    }
+
+    getObjectKeyV0(obj) {
+        return obj.key;
+    }
+
+    getObjectKeyV1(obj) {
+        return obj.key.slice(DbPrefixes.Master.length);
+    }
+
+    /**
+     *  Filter to apply on each iteration, based on:
+     *  - prefix
+     *  - delimiter
+     *  - maxKeys
+     *  The marker is being handled directly by levelDB
+     *  @param {Object} obj       - The key and value of the element
+     *  @param {String} obj.key   - The key of the element
+     *  @param {String} obj.value - The value of the element
+     *  @return {number}          - indicates if iteration should continue
+     */
+    filter(obj) {
+        const key = this.getObjectKey(obj);
+        const value = obj.value;
+        if ((this.prefix && !key.startsWith(this.prefix))
+            || (this.alphabeticalOrder
+                && typeof this[this.nextContinueMarker] === 'string'
+                && key <= this[this.nextContinueMarker])) {
+            return FILTER_SKIP;
+        }
+        if (this.delimiter) {
+            const baseIndex = this.prefix ? this.prefix.length : 0;
+            const delimiterIndex = key.indexOf(this.delimiter, baseIndex);
+            if (delimiterIndex === -1) {
+                return this.addContents(key, value);
+            }
+            return this.addCommonPrefix(key, delimiterIndex);
+        }
+        return this.addContents(key, value);
+    }
+
+    /**
+     * Add a Common Prefix in the list
+     * @param {String} key   - object name
+     * @param {Number} index - after prefix starting point
+     * @return {Boolean}     - indicates if iteration should continue
+     */
+    addCommonPrefix(key, index) {
+        const commonPrefix = getCommonPrefix(key, this.delimiter, index);
+        if (this.CommonPrefixes.indexOf(commonPrefix) === -1
+                && this[this.nextContinueMarker] !== commonPrefix) {
+            if (this._reachedMaxKeys()) {
+                return FILTER_END;
+            }
+            this.CommonPrefixes.push(commonPrefix);
+            this[this.nextContinueMarker] = commonPrefix;
+            ++this.keys;
+            return FILTER_ACCEPT;
+        }
+        return FILTER_SKIP;
+    }
+
+    /**
+     * If repd happens to want to skip listing on a bucket in v0
+     * versioning key format, here is an idea.
+     *
+     * @return {string} - the present range (NextMarker) if repd believes
+     *                    that it's enough and should move on
+     */
+    skippingV0() {
+        return this[this.nextContinueMarker];
+    }
+
+    /**
+     * If repd happens to want to skip listing on a bucket in v1
+     * versioning key format, here is an idea.
+     *
+     * @return {string} - the present range (NextMarker) if repd believes
+     *                    that it's enough and should move on
+     */
+    skippingV1() {
+        return DbPrefixes.Master + this[this.nextContinueMarker];
+    }
+
+    /**
+     *  Return an object containing all mandatory fields to use once the
+     *  iteration is done, doesn't show a NextMarker field if the output
+     *  isn't truncated
+     *  @return {Object} - following amazon format
+     */
+    result() {
+        /* NextMarker is only provided when delimiter is used.
+         * specified in v1 listing documentation
+         * http://docs.aws.amazon.com/AmazonS3/latest/API/RESTBucketGET.html
+         */
+        const result = {
+            CommonPrefixes: this.CommonPrefixes,
+            Contents: this.Contents,
+            IsTruncated: this.IsTruncated,
+            Delimiter: this.delimiter,
+        };
+        if (this.parameters.v2) {
+            result.NextContinuationToken = this.IsTruncated
+                ? this.NextContinuationToken : undefined;
+        } else {
+            result.NextMarker = (this.IsTruncated && this.delimiter)
+                ? this.NextMarker : undefined;
+        }
+        return result;
+    }
+}
+
+module.exports = { Delimiter };
--- a/lib/algos/list/delimiter.ts
+++ b/lib/algos/list/delimiter.ts
@ -1,356 +0,0 @@
-'use strict'; // eslint-disable-line strict
-
-const Extension = require('./Extension').default;
-const { inc, listingParamsMasterKeysV0ToV1,
-    FILTER_END, FILTER_ACCEPT, FILTER_SKIP, SKIP_NONE } = require('./tools');
-const VSConst = require('../../versioning/constants').VersioningConstants;
-const { DbPrefixes, BucketVersioningKeyFormat } = VSConst;
-
-export interface FilterState {
-    id: number,
-};
-
-export interface FilterReturnValue {
-    FILTER_ACCEPT,
-    FILTER_SKIP,
-    FILTER_END,
-};
-
-export const enum DelimiterFilterStateId {
-    NotSkipping = 1,
-    SkippingPrefix = 2,
-};
-
-export interface DelimiterFilterState_NotSkipping extends FilterState {
-    id: DelimiterFilterStateId.NotSkipping,
-};
-
-export interface DelimiterFilterState_SkippingPrefix extends FilterState {
-    id: DelimiterFilterStateId.SkippingPrefix,
-    prefix: string;
-};
-
-type KeyHandler = (key: string, value: string) => FilterReturnValue;
-
-export type ResultObject = {
-    CommonPrefixes: string[];
-    Contents: {
-        key: string;
-        value: string;
-    }[];
-    IsTruncated: boolean;
-    Delimiter ?: string;
-    NextMarker ?: string;
-    NextContinuationToken ?: string;
-};
-
-/**
- * Handle object listing with parameters
- *
- * @prop {String[]} CommonPrefixes     - 'folders' defined by the delimiter
- * @prop {String[]} Contents           - 'files' to list
- * @prop {Boolean} IsTruncated         - truncated listing flag
- * @prop {String|undefined} NextMarker - marker per amazon format
- * @prop {Number} keys                 - count of listed keys
- * @prop {String|undefined} delimiter  - separator per amazon format
- * @prop {String|undefined} prefix     - prefix per amazon format
- * @prop {Number} maxKeys              - number of keys to list
- */
-export class Delimiter extends Extension {
-
-    state: FilterState;
-    keyHandlers: { [id: number]: KeyHandler };
-
-    /**
-     * Create a new Delimiter instance
-     * @constructor
-     * @param {Object}  parameters                     - listing parameters
-     * @param {String}  [parameters.delimiter]         - delimiter per amazon
-     *                                                   format
-     * @param {String}  [parameters.prefix]            - prefix per amazon
-     *                                                   format
-     * @param {String}  [parameters.marker]            - marker per amazon
-     *                                                   format
-     * @param {Number}  [parameters.maxKeys]           - number of keys to list
-     * @param {Boolean} [parameters.v2]                - indicates whether v2
-     *                                                   format
-     * @param {String}  [parameters.startAfter]        - marker per amazon
-     *                                                   format
-     * @param {String}  [parameters.continuationToken] - obfuscated amazon
-     *                                                   token
-     * @param {RequestLogger} logger                   - The logger of the
-     *                                                   request
-     * @param {String} [vFormat]                       - versioning key format
-     */
-    constructor(parameters, logger, vFormat) {
-        super(parameters, logger);
-        // original listing parameters
-        this.delimiter = parameters.delimiter;
-        this.prefix = parameters.prefix;
-        this.maxKeys = parameters.maxKeys || 1000;
-
-        if (parameters.v2) {
-            this.marker = parameters.continuationToken || parameters.startAfter;
-        } else {
-            this.marker = parameters.marker;
-        }
-        this.nextMarker = this.marker;
-
-        this.vFormat = vFormat || BucketVersioningKeyFormat.v0;
-        // results
-        this.CommonPrefixes = [];
-        this.Contents = [];
-        this.IsTruncated = false;
-        this.keyHandlers = {};
-
-        Object.assign(this, {
-            [BucketVersioningKeyFormat.v0]: {
-                genMDParams: this.genMDParamsV0,
-                getObjectKey: this.getObjectKeyV0,
-                skipping: this.skippingV0,
-            },
-            [BucketVersioningKeyFormat.v1]: {
-                genMDParams: this.genMDParamsV1,
-                getObjectKey: this.getObjectKeyV1,
-                skipping: this.skippingV1,
-            },
-        }[this.vFormat]);
-
-        // if there is a delimiter, we may skip ranges by prefix,
-        // hence using the NotSkippingPrefix flavor that checks the
-        // subprefix up to the delimiter for the NotSkipping state
-        if (this.delimiter) {
-            this.setKeyHandler(
-                DelimiterFilterStateId.NotSkipping,
-                this.keyHandler_NotSkippingPrefix.bind(this));
-        } else {
-            // listing without a delimiter never has to skip over any
-            // prefix -> use NeverSkipping flavor for the NotSkipping
-            // state
-            this.setKeyHandler(
-                DelimiterFilterStateId.NotSkipping,
-                this.keyHandler_NeverSkipping.bind(this));
-        }
-        this.setKeyHandler(
-            DelimiterFilterStateId.SkippingPrefix,
-            this.keyHandler_SkippingPrefix.bind(this));
-
-        this.state = <DelimiterFilterState_NotSkipping> {
-            id: DelimiterFilterStateId.NotSkipping,
-        };
-    }
-
-    genMDParamsV0() {
-        const params: { gt ?: string, gte ?: string, lt ?: string } = {};
-        if (this.prefix) {
-            params.gte = this.prefix;
-            params.lt = inc(this.prefix);
-        }
-        if (this.marker && this.delimiter) {
-            const commonPrefix = this.getCommonPrefix(this.marker);
-            if (commonPrefix) {
-                const afterPrefix = inc(commonPrefix);
-                if (!params.gte || afterPrefix > params.gte) {
-                    params.gte = afterPrefix;
-                }
-            }
-        }
-        if (this.marker && (!params.gte || this.marker >= params.gte)) {
-            delete params.gte;
-            params.gt = this.marker;
-        }
-        return params;
-    }
-
-    genMDParamsV1() {
-        const params = this.genMDParamsV0();
-        return listingParamsMasterKeysV0ToV1(params);
-    }
-
-    /**
-     * check if the max keys count has been reached and set the
-     * final state of the result if it is the case
-     * @return {Boolean} - indicates if the iteration has to stop
-     */
-    _reachedMaxKeys(): boolean {
-        if (this.keys >= this.maxKeys) {
-            // In cases of maxKeys <= 0 -> IsTruncated = false
-            this.IsTruncated = this.maxKeys > 0;
-            return true;
-        }
-        return false;
-    }
-
-    /**
-     *  Add a (key, value) tuple to the listing
-     *  Set the NextMarker to the current key
-     *  Increment the keys counter
-     *  @param {String} key   - The key to add
-     *  @param {String} value - The value of the key
-     *  @return {number}      - indicates if iteration should continue
-     */
-    addContents(key: string, value: string): void {
-        this.Contents.push({ key, value: this.trimMetadata(value) });
-        ++this.keys;
-        this.nextMarker = key;
-    }
-
-    getCommonPrefix(key: string): string | undefined {
-        if (!this.delimiter) {
-            return undefined;
-        }
-        const baseIndex = this.prefix ? this.prefix.length : 0;
-        const delimiterIndex = key.indexOf(this.delimiter, baseIndex);
-        if (delimiterIndex === -1) {
-            return undefined;
-        }
-        return key.substring(0, delimiterIndex + this.delimiter.length);
-    }
-
-    /**
-     * Add a Common Prefix in the list
-     * @param {String} commonPrefix   - common prefix to add
-     * @param {String} key            - full key starting with commonPrefix
-     * @return {Boolean}     - indicates if iteration should continue
-     */
-    addCommonPrefix(commonPrefix: string, key: string): void {
-        // add the new prefix to the list
-        this.CommonPrefixes.push(commonPrefix);
-        ++this.keys;
-        this.nextMarker = commonPrefix;
-    }
-
-    addCommonPrefixOrContents(key: string, value: string): string | undefined {
-        // add the subprefix to the common prefixes if the key has the delimiter
-        const commonPrefix = this.getCommonPrefix(key);
-        if (commonPrefix) {
-            this.addCommonPrefix(commonPrefix, key);
-            return commonPrefix;
-        }
-        this.addContents(key, value);
-        return undefined;
-    }
-
-    getObjectKeyV0(obj: { key: string }): string {
-        return obj.key;
-    }
-
-    getObjectKeyV1(obj: { key: string }): string {
-        return obj.key.slice(DbPrefixes.Master.length);
-    }
-
-    /**
-     *  Filter to apply on each iteration, based on:
-     *  - prefix
-     *  - delimiter
-     *  - maxKeys
-     *  The marker is being handled directly by levelDB
-     *  @param {Object} obj       - The key and value of the element
-     *  @param {String} obj.key   - The key of the element
-     *  @param {String} obj.value - The value of the element
-     *  @return {number}          - indicates if iteration should continue
-     */
-    filter(obj: { key: string, value: string }): FilterReturnValue {
-        const key = this.getObjectKey(obj);
-        const value = obj.value;
-
-        return this.handleKey(key, value);
-    }
-
-    setState(state: FilterState): void {
-        this.state = state;
-    }
-
-    setKeyHandler(stateId: number, keyHandler: KeyHandler): void {
-        this.keyHandlers[stateId] = keyHandler;
-    }
-
-    handleKey(key: string, value: string): FilterReturnValue {
-        return this.keyHandlers[this.state.id](key, value);
-    }
-
-    keyHandler_NeverSkipping(key: string, value: string): FilterReturnValue {
-        if (this._reachedMaxKeys()) {
-            return FILTER_END;
-        }
-        this.addContents(key, value);
-        return FILTER_ACCEPT;
-    }
-
-    keyHandler_NotSkippingPrefix(key: string, value: string): FilterReturnValue {
-        if (this._reachedMaxKeys()) {
-            return FILTER_END;
-        }
-        const commonPrefix = this.addCommonPrefixOrContents(key, value);
-        if (commonPrefix) {
-            // transition into SkippingPrefix state to skip all following keys
-            // while they start with the same prefix
-            this.setState(<DelimiterFilterState_SkippingPrefix> {
-                id: DelimiterFilterStateId.SkippingPrefix,
-                prefix: commonPrefix,
-            });
-        }
-        return FILTER_ACCEPT;
-    }
-
-    keyHandler_SkippingPrefix(key: string, value: string): FilterReturnValue {
-        const { prefix } = <DelimiterFilterState_SkippingPrefix> this.state;
-        if (key.startsWith(prefix)) {
-            return FILTER_SKIP;
-        }
-        this.setState(<DelimiterFilterState_NotSkipping> {
-            id: DelimiterFilterStateId.NotSkipping,
-        });
-        return this.handleKey(key, value);
-    }
-
-    skippingBase(): string | undefined {
-        switch (this.state.id) {
-        case DelimiterFilterStateId.SkippingPrefix:
-            const { prefix } = <DelimiterFilterState_SkippingPrefix> this.state;
-            return inc(prefix);
-
-        default:
-            return SKIP_NONE;
-        }
-    }
-
-    skippingV0() {
-        return this.skippingBase();
-    }
-
-    skippingV1() {
-        const skipTo = this.skippingBase();
-        if (skipTo === SKIP_NONE) {
-            return SKIP_NONE;
-        }
-        return DbPrefixes.Master + skipTo;
-    }
-
-    /**
-     *  Return an object containing all mandatory fields to use once the
-     *  iteration is done, doesn't show a NextMarker field if the output
-     *  isn't truncated
-     *  @return {Object} - following amazon format
-     */
-    result(): ResultObject {
-        /* NextMarker is only provided when delimiter is used.
-         * specified in v1 listing documentation
-         * http://docs.aws.amazon.com/AmazonS3/latest/API/RESTBucketGET.html
-         */
-        const result: ResultObject = {
-            CommonPrefixes: this.CommonPrefixes,
-            Contents: this.Contents,
-            IsTruncated: this.IsTruncated,
-            Delimiter: this.delimiter,
-        };
-        if (this.parameters.v2) {
-            result.NextContinuationToken = this.IsTruncated
-                ? this.nextMarker : undefined;
-        } else {
-            result.NextMarker = (this.IsTruncated && this.delimiter)
-                ? this.nextMarker : undefined;
-        }
-        return result;
-    }
-}
--- a/lib/algos/list/delimiterCurrent.ts
+++ b/lib/algos/list/delimiterCurrent.ts
@ -1,5 +1,4 @@
-const { DelimiterMaster } = require('./delimiterMaster');
-const { FILTER_ACCEPT, FILTER_END } = require('./tools');
+const { Delimiter } = require('./delimiter');

 type ResultObject = {
    Contents: {
@ -11,16 +10,15 @@ type ResultObject = {
 };

 /**
- * Handle object listing with parameters. This extends the base class DelimiterMaster
+ * Handle object listing with parameters. This extends the base class Delimiter
 * to return the master/current versions.
 */
-class DelimiterCurrent extends DelimiterMaster {
+class DelimiterCurrent extends Delimiter {
    /**
     * Delimiter listing of current versions.
     * @param {Object}  parameters            - listing parameters
     * @param {String}  parameters.beforeDate - limit the response to keys older than beforeDate
     * @param {String}  parameters.excludedDataStoreName - excluded datatore name
-     * @param {Number} parameters.maxScannedLifecycleListingEntries - max number of entries to be scanned
     * @param {RequestLogger} logger          - The logger of the request
     * @param {String} [vFormat]              - versioning key format
     */
@ -29,14 +27,11 @@ class DelimiterCurrent extends DelimiterMaster {

        this.beforeDate = parameters.beforeDate;
        this.excludedDataStoreName = parameters.excludedDataStoreName;
-        this.maxScannedLifecycleListingEntries = parameters.maxScannedLifecycleListingEntries;
-        this.scannedKeys = 0;
    }

-    genMDParamsV0() {
-        const params = super.genMDParamsV0();
-        // lastModified and dataStoreName parameters are used by metadata that enables built-in filtering, 
-        // a feature currently exclusive to MongoDB
+    genMDParamsV1() {
+        const params = super.genMDParamsV1();
+
        if (this.beforeDate) {
            params.lastModified = {
                lt: this.beforeDate,
@ -48,77 +43,17 @@ class DelimiterCurrent extends DelimiterMaster {
                ne: this.excludedDataStoreName,
            }
        }
-
        return params;
    }

-    /**
-     * Parses the stringified entry's value.
-     * @param s - sringified value
-     * @return - undefined if parsing fails, otherwise it contains the parsed value.
-     */
-    _parse(s) {
-        let p;
-        try {
-            p = JSON.parse(s);
-        } catch (e: any) {
-            this.logger.warn(
-                'Could not parse Object Metadata while listing',
-                { err: e.toString() });
-        }
-        return p;
-    }
-
-    /**
-     * check if the max keys count has been reached and set the
-     * final state of the result if it is the case
-     *
-     * specialized implementation on DelimiterCurrent to also check
-     * the number of scanned keys
-     *
-     * @return {Boolean} - indicates if the iteration has to stop
-     */
-    _reachedMaxKeys(): boolean {
-        if (this.maxScannedLifecycleListingEntries && this.scannedKeys >= this.maxScannedLifecycleListingEntries) {
-            this.IsTruncated = true;
-            this.logger.info('listing stopped due to reaching the maximum scanned entries limit',
-                {
-                    maxScannedLifecycleListingEntries: this.maxScannedLifecycleListingEntries,
-                    scannedKeys: this.scannedKeys,
-                });
-            return true;
-        }
-        return super._reachedMaxKeys();
-    }
-
-    addContents(key, value) {
-        ++this.scannedKeys;
-        const parsedValue = this._parse(value);
-        // if parsing fails, skip the key.
-        if (parsedValue) {
-            const lastModified = parsedValue['last-modified'];
-            const dataStoreName = parsedValue.dataStoreName;
-            // We then check if the current version is older than the "beforeDate" and
-            // "excludedDataStoreName" is not specified or if specified and the data store name is different.
-            if ((!this.beforeDate || (lastModified && lastModified < this.beforeDate)) &&
-                (!this.excludedDataStoreName || dataStoreName !== this.excludedDataStoreName)) {
-                super.addContents(key, value);
-            }
-            // In the event of a timeout occurring before any content is added,
-            // NextMarker is updated even if the object is not eligible.
-            // It minimizes the amount of data that the client needs to re-process if the request times out.
-            this.nextMarker = key;
-        }
-    }
-
-    result(): object {
+    result(): ResultObject {
        const result: ResultObject = {
            Contents: this.Contents,
            IsTruncated: this.IsTruncated,
        };

        if (this.IsTruncated) {
-            result.NextMarker = this.nextMarker;
+            result.NextMarker = this.NextMarker;
        }

        return result;
--- a/lib/algos/list/delimiterMaster.js
+++ b/lib/algos/list/delimiterMaster.js
@ -0,0 +1,200 @@
+'use strict'; // eslint-disable-line strict
+
+const Delimiter = require('./delimiter').Delimiter;
+const Version = require('../../versioning/Version').Version;
+const VSConst = require('../../versioning/constants').VersioningConstants;
+const { BucketVersioningKeyFormat } = VSConst;
+const { FILTER_ACCEPT, FILTER_SKIP, SKIP_NONE } = require('./tools');
+
+const VID_SEP = VSConst.VersionId.Separator;
+const { DbPrefixes } = VSConst;
+
+/**
+ * Handle object listing with parameters. This extends the base class Delimiter
+ * to return the raw master versions of existing objects.
+ */
+class DelimiterMaster extends Delimiter {
+    /**
+     * Delimiter listing of master versions.
+     * @param {Object}  parameters            - listing parameters
+     * @param {String}  parameters.delimiter  - delimiter per amazon format
+     * @param {String}  parameters.prefix     - prefix per amazon format
+     * @param {String}  parameters.marker     - marker per amazon format
+     * @param {Number}  parameters.maxKeys    - number of keys to list
+     * @param {Boolean} parameters.v2         - indicates whether v2 format
+     * @param {String}  parameters.startAfter - marker per amazon v2 format
+     * @param {String}  parameters.continuationToken - obfuscated amazon token
+     * @param {RequestLogger} logger          - The logger of the request
+     * @param {String} [vFormat]              - versioning key format
+     */
+    constructor(parameters, logger, vFormat) {
+        super(parameters, logger, vFormat);
+        // non-PHD master version or a version whose master is a PHD version
+        this.prvKey = undefined;
+        this.prvPHDKey = undefined;
+        this.inReplayPrefix = false;
+
+        Object.assign(this, {
+            [BucketVersioningKeyFormat.v0]: {
+                filter: this.filterV0,
+                skipping: this.skippingV0,
+            },
+            [BucketVersioningKeyFormat.v1]: {
+                filter: this.filterV1,
+                skipping: this.skippingV1,
+            },
+        }[this.vFormat]);
+    }
+
+    /**
+     *  Filter to apply on each iteration for buckets in v0 format,
+     *  based on:
+     *  - prefix
+     *  - delimiter
+     *  - maxKeys
+     *  The marker is being handled directly by levelDB
+     *  @param {Object} obj       - The key and value of the element
+     *  @param {String} obj.key   - The key of the element
+     *  @param {String} obj.value - The value of the element
+     *  @return {number}          - indicates if iteration should continue
+     */
+    filterV0(obj) {
+        let key = obj.key;
+        const value = obj.value;
+
+        if (key.startsWith(DbPrefixes.Replay)) {
+            this.inReplayPrefix = true;
+            return FILTER_SKIP;
+        }
+        this.inReplayPrefix = false;
+
+        /* Skip keys not starting with the prefix or not alphabetically
+         * ordered. */
+        if ((this.prefix && !key.startsWith(this.prefix))
+                || (typeof this[this.nextContinueMarker] === 'string' &&
+                    key <= this[this.nextContinueMarker])) {
+            return FILTER_SKIP;
+        }
+
+        /* Skip version keys (<key><versionIdSeparator><version>) if we already
+         * have a master version. */
+        const versionIdIndex = key.indexOf(VID_SEP);
+        if (versionIdIndex >= 0) {
+            key = key.slice(0, versionIdIndex);
+            /* - key === this.prvKey is triggered when a master version has
+             *   been accepted for this key,
+             * - key === this.NextMarker or this.NextContinueToken is triggered
+             *   when a listing page ends on an accepted obj and the next page
+             *   starts with a version of this object.
+             *   In that case prvKey is default set to undefined
+             *   in the constructor and comparing to NextMarker is the only
+             *   way to know  we should not accept this version. This test is
+             *   not redundant with the one at the beginning of this function,
+             *   we are comparing here the key without the version suffix,
+             * - key startsWith the previous NextMarker happens because we set
+             *   NextMarker to the common prefix instead of the whole key
+             *   value. (TODO: remove this test once ZENKO-1048 is fixed)
+             *   */
+            if (key === this.prvKey || key === this[this.nextContinueMarker] ||
+                (this.delimiter &&
+                key.startsWith(this[this.nextContinueMarker]))) {
+                /* master version already filtered */
+                return FILTER_SKIP;
+            }
+        }
+        if (Version.isPHD(value)) {
+            /* master version is a PHD version, we want to wait for the next
+             * one:
+             * - Set the prvKey to undefined to not skip the next version,
+             * - return accept to avoid users to skip the next values in range
+             *   (skip scan mechanism in metadata backend like Metadata or
+             *   MongoClient). */
+            this.prvKey = undefined;
+            this.prvPHDKey = key;
+            return FILTER_ACCEPT;
+        }
+        if (Version.isDeleteMarker(value)) {
+            /* This entry is a deleteMarker which has not been filtered by the
+             * version test. Either :
+             * - it is a deleteMarker on the master version, we want to SKIP
+             *   all the following entries with this key (no master version),
+             * - or a deleteMarker following a PHD (setting prvKey to undefined
+             *   when an entry is a PHD avoids the skip on version for the
+             *   next entry). In that case we expect the master version to
+             *   follow. */
+            if (key === this.prvPHDKey) {
+                this.prvKey = undefined;
+                return FILTER_ACCEPT;
+            }
+            this.prvKey = key;
+            return FILTER_SKIP;
+        }
+
+        this.prvKey = key;
+        if (this.delimiter) {
+            // check if the key has the delimiter
+            const baseIndex = this.prefix ? this.prefix.length : 0;
+            const delimiterIndex = key.indexOf(this.delimiter, baseIndex);
+            if (delimiterIndex >= 0) {
+                // try to add the prefix to the list
+                return this.addCommonPrefix(key, delimiterIndex);
+            }
+        }
+        return this.addContents(key, value);
+    }
+
+    /**
+     *  Filter to apply on each iteration for buckets in v1 format,
+     *  based on:
+     *  - prefix
+     *  - delimiter
+     *  - maxKeys
+     *  The marker is being handled directly by levelDB
+     *  @param {Object} obj       - The key and value of the element
+     *  @param {String} obj.key   - The key of the element
+     *  @param {String} obj.value - The value of the element
+     *  @return {number}          - indicates if iteration should continue
+     */
+    filterV1(obj) {
+        const value = obj.value;
+        if (value && Version.isDeleteMarker(value)) {
+            // Filtering master keys in v1 is simply listing the master
+            // keys, but we have to handle the corner case where objects
+            // got deleted when the versioning was suspended
+            return FILTER_SKIP;
+        }
+        return super.filter(obj);
+    }
+
+    skippingBase() {
+        if (this[this.nextContinueMarker]) {
+            // next marker or next continuation token:
+            // - foo/ : skipping foo/
+            // - foo  : skipping foo.
+            const index = this[this.nextContinueMarker].
+                lastIndexOf(this.delimiter);
+            if (index === this[this.nextContinueMarker].length - 1) {
+                return this[this.nextContinueMarker];
+            }
+            return this[this.nextContinueMarker] + VID_SEP;
+        }
+        return SKIP_NONE;
+    }
+
+    skippingV0() {
+        if (this.inReplayPrefix) {
+            return DbPrefixes.Replay;
+        }
+        return this.skippingBase();
+    }
+
+    skippingV1() {
+        const skipTo = this.skippingBase();
+        if (skipTo === SKIP_NONE) {
+            return SKIP_NONE;
+        }
+        return DbPrefixes.Master + skipTo;
+    }
+}
+
+module.exports = { DelimiterMaster };
--- a/lib/algos/list/delimiterMaster.ts
+++ b/lib/algos/list/delimiterMaster.ts
@ -1,620 +0,0 @@
-import {
-    Delimiter,
-    FilterState,
-    FilterReturnValue,
-    DelimiterFilterStateId,
-    DelimiterFilterState_NotSkipping,
-    DelimiterFilterState_SkippingPrefix,
-    ResultObject,
-} from './delimiter';
-const Version = require('../../versioning/Version').Version;
-const VSConst = require('../../versioning/constants').VersioningConstants;
-const { BucketVersioningKeyFormat } = VSConst;
-const { FILTER_ACCEPT, FILTER_SKIP, FILTER_END, SKIP_NONE, inc } = require('./tools');
-
-import { GapSetEntry } from '../cache/GapSet';
-import { GapCacheInterface } from '../cache/GapCache';
-
-const VID_SEP = VSConst.VersionId.Separator;
-const { DbPrefixes } = VSConst;
-
-export const enum DelimiterMasterFilterStateId {
-    SkippingVersionsV0 = 101,
-    WaitVersionAfterPHDV0 = 102,
-    SkippingGapV0 = 103,
-};
-
-interface DelimiterMasterFilterState_SkippingVersionsV0 extends FilterState {
-    id: DelimiterMasterFilterStateId.SkippingVersionsV0,
-    masterKey: string,
-};
-
-interface DelimiterMasterFilterState_WaitVersionAfterPHDV0 extends FilterState {
-    id: DelimiterMasterFilterStateId.WaitVersionAfterPHDV0,
-    masterKey: string,
-};
-
-interface DelimiterMasterFilterState_SkippingGapV0 extends FilterState {
-    id: DelimiterMasterFilterStateId.SkippingGapV0,
-};
-
-export const enum GapCachingState {
-    NoGapCache = 0, // there is no gap cache
-    UnknownGap = 1, // waiting for a cache lookup
-    GapLookupInProgress = 2, // asynchronous gap lookup in progress
-    GapCached = 3, // an upcoming or already skippable gap is cached
-    NoMoreGap = 4, // the cache doesn't have any more gaps inside the listed range
-};
-
-type GapCachingInfo_NoGapCache = {
-    state: GapCachingState.NoGapCache;
-};
-
-type GapCachingInfo_NoCachedGap = {
-    state: GapCachingState.UnknownGap
-        | GapCachingState.GapLookupInProgress
-    gapCache: GapCacheInterface;
-};
-
-type GapCachingInfo_GapCached = {
-    state: GapCachingState.GapCached;
-    gapCache: GapCacheInterface;
-    gapCached: GapSetEntry;
-};
-
-type GapCachingInfo_NoMoreGap = {
-    state: GapCachingState.NoMoreGap;
-};
-
-type GapCachingInfo = GapCachingInfo_NoGapCache
-    | GapCachingInfo_NoCachedGap
-    | GapCachingInfo_GapCached
-    | GapCachingInfo_NoMoreGap;
-
-
-export const enum GapBuildingState {
-    Disabled = 0, // no gap cache or no gap building needed (e.g. in V1 versioning format)
-    NotBuilding = 1, // not currently building a gap (i.e. not listing within a gap)
-    Building = 2, // currently building a gap (i.e. listing within a gap)
-    Expired = 3, // not allowed to build due to exposure delay timeout
-};
-
-type GapBuildingInfo_NothingToBuild = {
-    state: GapBuildingState.Disabled | GapBuildingState.Expired;
-};
-
-type GapBuildingParams = {
-    /**
-     * minimum weight for a gap to be created in the cache
-     */
-    minGapWeight: number;
-    /**
-     * trigger a cache setGap() call every N skippable keys
-     */
-    triggerSaveGapWeight: number;
-    /**
-     * timestamp to assess whether we're still inside the validity period to
-     * be allowed to build gaps
-     */
-    initTimestamp: number;
-};
-
-type GapBuildingInfo_NotBuilding = {
-    state: GapBuildingState.NotBuilding;
-    gapCache: GapCacheInterface;
-    params: GapBuildingParams;
-};
-
-type GapBuildingInfo_Building = {
-    state: GapBuildingState.Building;
-    gapCache: GapCacheInterface;
-    params: GapBuildingParams;
-    /**
-     * Gap currently being created
-     */
-    gap: GapSetEntry;
-    /**
-     * total current weight of the gap being created
-     */
-    gapWeight: number;
-};
-
-type GapBuildingInfo = GapBuildingInfo_NothingToBuild
-    | GapBuildingInfo_NotBuilding
-    | GapBuildingInfo_Building;
-
-/**
- * Handle object listing with parameters. This extends the base class Delimiter
- * to return the raw master versions of existing objects.
- */
-export class DelimiterMaster extends Delimiter {
-
-    _gapCaching: GapCachingInfo;
-    _gapBuilding: GapBuildingInfo;
-    _refreshedBuildingParams: GapBuildingParams | null;
-
-    /**
-     * Delimiter listing of master versions.
-     * @param {Object}  parameters            - listing parameters
-     * @param {String}  [parameters.delimiter]  - delimiter per amazon format
-     * @param {String}  [parameters.prefix]     - prefix per amazon format
-     * @param {String}  [parameters.marker]     - marker per amazon format
-     * @param {Number}  [parameters.maxKeys]    - number of keys to list
-     * @param {Boolean} [parameters.v2]         - indicates whether v2 format
-     * @param {String}  [parameters.startAfter] - marker per amazon v2 format
-     * @param {String}  [parameters.continuationToken] - obfuscated amazon token
-     * @param {RequestLogger} logger            - The logger of the request
-     * @param {String}  [vFormat="v0"]          - versioning key format
-     */
-    constructor(parameters, logger, vFormat?: string) {
-        super(parameters, logger, vFormat);
-
-        if (this.vFormat === BucketVersioningKeyFormat.v0) {
-            // override Delimiter's implementation of NotSkipping for
-            // DelimiterMaster logic (skipping versions and special
-            // handling of delete markers and PHDs)
-            this.setKeyHandler(
-                DelimiterFilterStateId.NotSkipping,
-                this.keyHandler_NotSkippingPrefixNorVersionsV0.bind(this));
-
-            // add extra state handlers specific to DelimiterMaster with v0 format
-            this.setKeyHandler(
-                DelimiterMasterFilterStateId.SkippingVersionsV0,
-                this.keyHandler_SkippingVersionsV0.bind(this));
-
-            this.setKeyHandler(
-                DelimiterMasterFilterStateId.WaitVersionAfterPHDV0,
-                this.keyHandler_WaitVersionAfterPHDV0.bind(this));
-
-            this.setKeyHandler(
-                DelimiterMasterFilterStateId.SkippingGapV0,
-                this.keyHandler_SkippingGapV0.bind(this));
-
-            if (this.marker) {
-                // distinct initial state to include some special logic
-                // before the first master key is found that does not have
-                // to be checked afterwards
-                this.state = <DelimiterMasterFilterState_SkippingVersionsV0> {
-                    id: DelimiterMasterFilterStateId.SkippingVersionsV0,
-                    masterKey: this.marker,
-                };
-            } else {
-                this.state = <DelimiterFilterState_NotSkipping> {
-                    id: DelimiterFilterStateId.NotSkipping,
-                };
-            }
-        } else {
-            // save base implementation of the `NotSkipping` state in
-            // Delimiter before overriding it with ours, to be able to call it from there
-            this.keyHandler_NotSkipping_Delimiter = this.keyHandlers[DelimiterFilterStateId.NotSkipping];
-            this.setKeyHandler(
-                DelimiterFilterStateId.NotSkipping,
-                this.keyHandler_NotSkippingPrefixNorVersionsV1.bind(this));
-        }
-        // in v1, we can directly use Delimiter's implementation,
-        // which is already set to the proper state
-
-        // default initialization of the gap cache and building states, can be
-        // set by refreshGapCache()
-        this._gapCaching = {
-            state: GapCachingState.NoGapCache,
-        };
-        this._gapBuilding = {
-            state: GapBuildingState.Disabled,
-        };
-        this._refreshedBuildingParams = null;
-    }
-
-    /**
-     * Get the validity period left before a refresh of the gap cache is needed
-     * to continue building new gaps.
-     *
-     * @return {number|null} one of:
-     * - the remaining time in milliseconds in which gaps can be added to the
-     *   cache before a call to refreshGapCache() is required
-     * - or 0 if there is no time left and a call to refreshGapCache() is required
-     *   to resume caching gaps
-     * - or null if refreshing the cache is never needed (because the gap cache
-     *   is either not available or not used)
-     */
-    getGapBuildingValidityPeriodMs(): number | null {
-        let gapBuilding;
-        switch (this._gapBuilding.state) {
-        case GapBuildingState.Disabled:
-            return null;
-        case GapBuildingState.Expired:
-            return 0;
-        case GapBuildingState.NotBuilding:
-            gapBuilding = <GapBuildingInfo_NotBuilding> this._gapBuilding;
-            break;
-        case GapBuildingState.Building:
-            gapBuilding = <GapBuildingInfo_Building> this._gapBuilding;
-            break;
-        }
-        const { gapCache, params } = gapBuilding;
-        const elapsedTime = Date.now() - params.initTimestamp;
-        return Math.max(gapCache.exposureDelayMs - elapsedTime, 0);
-    }
-
-    /**
-     * Refresh the gaps caching logic (gaps are series of current delete markers
-     * in V0 bucket metadata format). It has two effects:
-     *
-     * - starts exposing existing and future gaps from the cache to efficiently
-     *   skip over series of current delete markers that have been seen and cached
-     *   earlier
-     *
-     * - enables building and caching new gaps (or extend existing ones), for a
-     *   limited time period defined by the `gapCacheProxy.exposureDelayMs` value
-     *   in milliseconds. To refresh the validity period and resume building and
-     *   caching new gaps, one must restart a new listing from the database (starting
-     *   at the current listing key, included), then call refreshGapCache() again.
-     *
-     * @param {GapCacheInterface} gapCacheProxy - API proxy to the gaps cache
-     *   (the proxy should handle prefixing object keys with the bucket name)
-     * @param {number} [minGapWeight=100] - minimum weight of a gap for it to be
-     *   added in the cache
-     * @param {number} [triggerSaveGapWeight] - cumulative weight to wait for
-     *   before saving the current building gap. Cannot be greater than
-     *   `gapCacheProxy.maxGapWeight` (the value is thresholded to `maxGapWeight`
-     *   otherwise). Defaults to `gapCacheProxy.maxGapWeight / 2`.
-     * @return {undefined}
-     */
-    refreshGapCache(
-        gapCacheProxy: GapCacheInterface,
-        minGapWeight?: number,
-        triggerSaveGapWeight?: number
-    ): void {
-        if (this.vFormat !== BucketVersioningKeyFormat.v0) {
-            return;
-        }
-        if (this._gapCaching.state === GapCachingState.NoGapCache) {
-            this._gapCaching = {
-                state: GapCachingState.UnknownGap,
-                gapCache: gapCacheProxy,
-            };
-        }
-        const refreshedBuildingParams: GapBuildingParams = {
-            minGapWeight: minGapWeight || 100,
-            triggerSaveGapWeight: triggerSaveGapWeight
-                || Math.trunc(gapCacheProxy.maxGapWeight / 2),
-            initTimestamp: Date.now(),
-        };
-        if (this._gapBuilding.state === GapBuildingState.Building) {
-            // refreshed params will be applied as soon as the current building gap is saved
-            this._refreshedBuildingParams = refreshedBuildingParams;
-        } else {
-            this._gapBuilding = {
-                state: GapBuildingState.NotBuilding,
-                gapCache: gapCacheProxy,
-                params: refreshedBuildingParams,
-            };
-        }
-    }
-
-    /**
-     * Trigger a lookup of the closest upcoming or already skippable gap.
-     *
-     * @param {string} fromKey - lookup a gap not before 'fromKey'
-     * @return {undefined} - the lookup is asynchronous and its
-     * response is handled inside this function
-     */
-    _triggerGapLookup(gapCaching: GapCachingInfo_NoCachedGap, fromKey: string): void {
-        this._gapCaching = {
-            state: GapCachingState.GapLookupInProgress,
-            gapCache: gapCaching.gapCache,
-        };
-        const maxKey = this.prefix ? inc(this.prefix) : undefined;
-        gapCaching.gapCache.lookupGap(fromKey, maxKey).then(_gap => {
-            const gap = <GapSetEntry | null> _gap;
-            if (gap) {
-                this._gapCaching = {
-                    state: GapCachingState.GapCached,
-                    gapCache: gapCaching.gapCache,
-                    gapCached: gap,
-                };
-            } else {
-                this._gapCaching = {
-                    state: GapCachingState.NoMoreGap,
-                };
-            }
-        });
-    }
-
-    _checkGapOnMasterDeleteMarker(key: string): FilterReturnValue {
-        switch (this._gapBuilding.state) {
-        case GapBuildingState.Disabled:
-        case GapBuildingState.Expired:
-            break;
-        case GapBuildingState.NotBuilding:
-            this._createBuildingGap(key, 1);
-            break;
-        case GapBuildingState.Building:
-            this._updateBuildingGap(key);
-            break;
-        }
-        if (this._gapCaching.state === GapCachingState.GapCached) {
-            const { gapCached } = this._gapCaching;
-            if (key >= gapCached.firstKey) {
-                if (key <= gapCached.lastKey) {
-                    // we are inside the last looked up cached gap: transition to
-                    // 'SkippingGapV0' state
-                    this.setState(<DelimiterMasterFilterState_SkippingGapV0> {
-                        id: DelimiterMasterFilterStateId.SkippingGapV0,
-                    });
-                    // cut the current gap before skipping, it will be merged or
-                    // chained with the existing one (depending on its weight)
-                    if (this._gapBuilding.state === GapBuildingState.Building) {
-                        // substract 1 from the weight because we are going to chain this gap,
-                        // which has an overlap of one key.
-                        this._gapBuilding.gap.weight -= 1;
-                        this._cutBuildingGap();
-                    }
-                    return FILTER_SKIP;
-                }
-                // as we are past the cached gap, we will need another lookup
-                this._gapCaching = {
-                    state: GapCachingState.UnknownGap,
-                    gapCache: this._gapCaching.gapCache,
-                };
-            }
-        }
-        if (this._gapCaching.state === GapCachingState.UnknownGap) {
-            this._triggerGapLookup(this._gapCaching, key);
-        }
-        return FILTER_ACCEPT;
-    }
-
-    filter_onNewMasterKeyV0(key: string, value: string): FilterReturnValue {
-        // if this master key is a delete marker, accept it without
-        // adding the version to the contents
-        if (Version.isDeleteMarker(value)) {
-            // update the state to start skipping versions of the new master key
-            this.setState(<DelimiterMasterFilterState_SkippingVersionsV0> {
-                id: DelimiterMasterFilterStateId.SkippingVersionsV0,
-                masterKey: key,
-            });
-            return this._checkGapOnMasterDeleteMarker(key);
-        }
-        if (Version.isPHD(value)) {
-            // master version is a PHD version: wait for the first
-            // following version that will be considered as the actual
-            // master key
-            this.setState(<DelimiterMasterFilterState_WaitVersionAfterPHDV0> {
-                id: DelimiterMasterFilterStateId.WaitVersionAfterPHDV0,
-                masterKey: key,
-            });
-            return FILTER_ACCEPT;
-        }
-        // cut the current gap as soon as a non-deleted entry is seen
-        this._cutBuildingGap();
-
-        if (key.startsWith(DbPrefixes.Replay)) {
-            // skip internal replay prefix entirely
-            this.setState(<DelimiterFilterState_SkippingPrefix> {
-                id: DelimiterFilterStateId.SkippingPrefix,
-                prefix: DbPrefixes.Replay,
-            });
-            return FILTER_SKIP;
-        }
-        if (this._reachedMaxKeys()) {
-            return FILTER_END;
-        }
-
-        const commonPrefix = this.addCommonPrefixOrContents(key, value);
-        if (commonPrefix) {
-            // transition into SkippingPrefix state to skip all following keys
-            // while they start with the same prefix
-            this.setState(<DelimiterFilterState_SkippingPrefix> {
-                id: DelimiterFilterStateId.SkippingPrefix,
-                prefix: commonPrefix,
-            });
-            return FILTER_ACCEPT;
-        }
-        // update the state to start skipping versions of the new master key
-        this.setState(<DelimiterMasterFilterState_SkippingVersionsV0> {
-            id: DelimiterMasterFilterStateId.SkippingVersionsV0,
-            masterKey: key,
-        });
-        return FILTER_ACCEPT;
-    }
-
-    keyHandler_NotSkippingPrefixNorVersionsV0(key: string, value: string): FilterReturnValue {
-        return this.filter_onNewMasterKeyV0(key, value);
-    }
-
-    filter_onNewMasterKeyV1(key: string, value: string): FilterReturnValue {
-        // if this master key is a delete marker, accept it without
-        // adding the version to the contents
-        if (Version.isDeleteMarker(value)) {
-            return FILTER_ACCEPT;
-        }
-        // use base Delimiter's implementation
-        return this.keyHandler_NotSkipping_Delimiter(key, value);
-    }
-
-    keyHandler_NotSkippingPrefixNorVersionsV1(key: string, value: string): FilterReturnValue {
-        return this.filter_onNewMasterKeyV1(key, value);
-    }
-
-    keyHandler_SkippingVersionsV0(key: string, value: string): FilterReturnValue {
-        /* In the SkippingVersionsV0 state, skip all version keys
-         * (<key><versionIdSeparator><version>) */
-        const versionIdIndex = key.indexOf(VID_SEP);
-        if (versionIdIndex !== -1) {
-            // version keys count in the building gap weight because they must
-            // also be listed until skipped
-            if (this._gapBuilding.state === GapBuildingState.Building) {
-                this._updateBuildingGap(key);
-            }
-            return FILTER_SKIP;
-        }
-        return this.filter_onNewMasterKeyV0(key, value);
-    }
-
-    keyHandler_WaitVersionAfterPHDV0(key: string, value: string): FilterReturnValue {
-        // After a PHD key is encountered, the next version key of the
-        // same object if it exists is the new master key, hence
-        // consider it as such and call 'onNewMasterKeyV0' (the test
-        // 'masterKey == phdKey' is probably redundant when we already
-        // know we have a versioned key, since all objects in v0 have
-        // a master key, but keeping it in doubt)
-        const { masterKey: phdKey } = <DelimiterMasterFilterState_WaitVersionAfterPHDV0> this.state;
-        const versionIdIndex = key.indexOf(VID_SEP);
-        if (versionIdIndex !== -1) {
-            const masterKey = key.slice(0, versionIdIndex);
-            if (masterKey === phdKey) {
-                return this.filter_onNewMasterKeyV0(masterKey, value);
-            }
-        }
-        return this.filter_onNewMasterKeyV0(key, value);
-    }
-
-    keyHandler_SkippingGapV0(key: string, value: string): FilterReturnValue {
-        const { gapCache, gapCached } = <GapCachingInfo_GapCached> this._gapCaching;
-        if (key <= gapCached.lastKey) {
-            return FILTER_SKIP;
-        }
-        this._gapCaching = {
-            state: GapCachingState.UnknownGap,
-            gapCache,
-        };
-        this.setState(<DelimiterMasterFilterState_SkippingVersionsV0> {
-            id: DelimiterMasterFilterStateId.SkippingVersionsV0,
-        });
-        // Start a gap with weight=0 from the latest skippable key. This will
-        // allow to extend the gap just skipped with a chained gap in case
-        // other delete markers are seen after the existing gap is skipped.
-        this._createBuildingGap(gapCached.lastKey, 0, gapCached.weight);
-
-        return this.handleKey(key, value);
-    }
-
-    skippingBase(): string | undefined {
-        switch (this.state.id) {
-        case DelimiterMasterFilterStateId.SkippingVersionsV0:
-            const { masterKey } = <DelimiterMasterFilterState_SkippingVersionsV0> this.state;
-            return masterKey + inc(VID_SEP);
-
-        case DelimiterMasterFilterStateId.SkippingGapV0:
-            const { gapCached } = <GapCachingInfo_GapCached> this._gapCaching;
-            return gapCached.lastKey;
-
-        default:
-            return super.skippingBase();
-        }
-    }
-
-    result(): ResultObject {
-        this._cutBuildingGap();
-        return super.result();
-    }
-
-    _checkRefreshedBuildingParams(params: GapBuildingParams): GapBuildingParams {
-        if (this._refreshedBuildingParams) {
-            const newParams = this._refreshedBuildingParams;
-            this._refreshedBuildingParams = null;
-            return newParams;
-        }
-        return params;
-    }
-
-    /**
-     * Save the gap being built if allowed (i.e. still within the
-     * allocated exposure time window).
-     *
-     * @return {boolean} - true if the gap was saved, false if we are
-     * outside the allocated exposure time window.
-     */
-    _saveBuildingGap(): boolean {
-        const { gapCache, params, gap, gapWeight } =
-              <GapBuildingInfo_Building> this._gapBuilding;
-        const totalElapsed = Date.now() - params.initTimestamp;
-        if (totalElapsed >= gapCache.exposureDelayMs) {
-            this._gapBuilding = {
-                state: GapBuildingState.Expired,
-            };
-            this._refreshedBuildingParams = null;
-            return false;
-        }
-        const { firstKey, lastKey, weight } = gap;
-        gapCache.setGap(firstKey, lastKey, weight);
-        this._gapBuilding = {
-            state: GapBuildingState.Building,
-            gapCache,
-            params: this._checkRefreshedBuildingParams(params),
-            gap: {
-                firstKey: gap.lastKey,
-                lastKey: gap.lastKey,
-                weight: 0,
-            },
-            gapWeight,
-        };
-        return true;
-    }
-
-    /**
-     * Create a new gap to be extended afterwards
-     *
-     * @param {string} newKey - gap's first key
-     * @param {number} startWeight - initial weight of the building gap (usually 0 or 1)
-     * @param {number} [cachedWeight] - if continuing a cached gap, weight of the existing
-     *   cached portion
-     * @return {undefined}
-     */
-    _createBuildingGap(newKey: string, startWeight: number, cachedWeight?: number): void {
-        if (this._gapBuilding.state === GapBuildingState.NotBuilding) {
-            const { gapCache, params } = <GapBuildingInfo_NotBuilding> this._gapBuilding;
-            this._gapBuilding = {
-                state: GapBuildingState.Building,
-                gapCache,
-                params: this._checkRefreshedBuildingParams(params),
-                gap: {
-                    firstKey: newKey,
-                    lastKey: newKey,
-                    weight: startWeight,
-                },
-                gapWeight: (cachedWeight || 0) + startWeight,
-            };
-        }
-    }
-
-    _updateBuildingGap(newKey: string): void {
-        const gapBuilding = <GapBuildingInfo_Building> this._gapBuilding;
-        const { params, gap } = gapBuilding;
-        gap.lastKey = newKey;
-        gap.weight += 1;
-        gapBuilding.gapWeight += 1;
-        // the GapCache API requires updating a gap regularly because it can only split
-        // it once per update, by the known last key. In practice the default behavior
-        // is to trigger an update after a number of keys that is half the maximum weight.
-        // It is also useful for other listings to benefit from the cache sooner.
-        if (gapBuilding.gapWeight >= params.minGapWeight &&
-            gap.weight >= params.triggerSaveGapWeight) {
-            this._saveBuildingGap();
-        }
-    }
-
-    _cutBuildingGap(): void {
-        if (this._gapBuilding.state === GapBuildingState.Building) {
-            let gapBuilding = <GapBuildingInfo_Building> this._gapBuilding;
-            let { gapCache, params, gap, gapWeight } = gapBuilding;
-            // only set gaps that are significant enough in weight and
-            // with a non-empty extension
-            if (gapWeight >= params.minGapWeight && gap.weight > 0) {
-                // we're done if we were not allowed to save the gap
-                if (!this._saveBuildingGap()) {
-                    return;
-                }
-                // params may have been refreshed, reload them
-                gapBuilding = <GapBuildingInfo_Building> this._gapBuilding;
-                params = gapBuilding.params;
-            }
-            this._gapBuilding = {
-                state: GapBuildingState.NotBuilding,
-                gapCache,
-                params,
-            };
-        }
-    }
-}
--- a/lib/algos/list/delimiterNonCurrent.js
+++ b/lib/algos/list/delimiterNonCurrent.js
@ -1,37 +1,83 @@
-const { DelimiterVersions } = require('./delimiterVersions');
-const { FILTER_END, FILTER_SKIP } = require('./tools');
+'use strict'; // eslint-disable-line strict
+const Delimiter = require('./delimiter').Delimiter;
+const VSConst = require('../../versioning/constants').VersioningConstants;
+const { inc, FILTER_ACCEPT, FILTER_END, SKIP_NONE } = require('./tools');
+const VID_SEP = VSConst.VersionId.Separator;
+const { DbPrefixes } = VSConst;

+// TODO: find an acceptable timeout value.
+const DELIMITER_TIMEOUT_MS = 10 * 1000; // 10s
 const TRIM_METADATA_MIN_BLOB_SIZE = 10000;

 /**
- * Handle object listing with parameters. This extends the base class DelimiterVersions
+ * Handle object listing with parameters. This extends the base class Delimiter
 * to return the raw non-current versions objects.
 */
-class DelimiterNonCurrent extends DelimiterVersions {
+class DelimiterNonCurrent extends Delimiter {
    /**
     * Delimiter listing of non-current versions.
     * @param {Object}  parameters                  - listing parameters
-     * @param {String}  parameters.keyMarker        - key marker
     * @param {String}  parameters.versionIdMarker  - version id marker
-     * @param {String}  parameters.beforeDate       - limit the response to keys with stale date older than beforeDate.
+     * @param {String}  parameters.beforeDate       - limit the response to keys with stale date older than beforeDate
     * “stale date” is the date on when a version becomes non-current.
-     * @param {Number} parameters.maxScannedLifecycleListingEntries - max number of entries to be scanned
-     * @param {String} parameters.excludedDataStoreName - exclude dataStoreName matches from the versions
+     * @param {String}  parameters.keyMarker        - key marker
     * @param {RequestLogger} logger                - The logger of the request
     * @param {String} [vFormat]                    - versioning key format
     */
    constructor(parameters, logger, vFormat) {
        super(parameters, logger, vFormat);

+        this.versionIdMarker = parameters.versionIdMarker;
        this.beforeDate = parameters.beforeDate;
+        this.keyMarker = parameters.keyMarker;
        this.excludedDataStoreName = parameters.excludedDataStoreName;
-        this.maxScannedLifecycleListingEntries = parameters.maxScannedLifecycleListingEntries;
+        this.NextKeyMarker = null;

-        // internal state
-        this.prevKey = null;
+        this.skipping = this.skippingV1;
+        this.genMDParams = this.genMDParamsV1;
+
+        this.keyName = null;
        this.staleDate = null;

-        this.scannedKeys = 0;
+        // used for monitoring
+        this.evaluatedKeys = 0;
+    }
+
+    skippingV1() {
+        return SKIP_NONE;
+    }
+
+    genMDParamsV1() {
+        const params = {
+            gte: DbPrefixes.Version,
+            lt: inc(DbPrefixes.Version),
+        };
+
+        if (this.prefix) {
+            params.gte = `${DbPrefixes.Version}${this.prefix}`;
+            params.lt = `${DbPrefixes.Version}${inc(this.prefix)}`;
+        }
+
+        if (this.keyMarker && `${DbPrefixes.Version}${this.keyMarker}` >= params.gte) {
+            if (this.versionIdMarker) {
+                // versionIdMarker should always come with keyMarker but may not be the other way around.
+                // NOTE: "gte" (instead of "gt") is used to include the last version of the "previous"
+                // truncated listing when a versionId marker is specified.
+                // This "previous"/"already evaluated" version will be used to retrieve the stale date and
+                // skipped to not evaluate the same key twice in the addContents() method.
+                params.gte = DbPrefixes.Version
+                    + this.keyMarker
+                    + VID_SEP
+                    + this.versionIdMarker;
+            } else {
+                delete params.gte;
+                params.gt = DbPrefixes.Version + inc(this.keyMarker + VID_SEP);
+            }
+        }
+
+        this.start = Date.now();
+
+        return params;
    }

    getLastModified(value) {
@ -49,44 +95,12 @@ class DelimiterNonCurrent extends DelimiterVersions {
        return lastModified;
    }

-    // Overwrite keyHandler_SkippingVersions to include the last version from the previous listing.
-    // The creation (last-modified) date of this version will be the stale date for the following version.
-    // eslint-disable-next-line camelcase
-    keyHandler_SkippingVersions(key, versionId, value) {
-        if (key === this.keyMarker) {
-            // since the nonversioned key equals the marker, there is
-            // necessarily a versionId in this key
-            const _versionId = versionId;
-            if (_versionId < this.versionIdMarker) {
-                // skip all versions until marker
-                return FILTER_SKIP;
-            }
-        }
-        this.setState({
-            id: 1 /* NotSkipping */,
-        });
-        return this.handleKey(key, versionId, value);
-    }
-
-    filter(obj) {
-        if (this.maxScannedLifecycleListingEntries && this.scannedKeys >= this.maxScannedLifecycleListingEntries) {
-            this.IsTruncated = true;
-            this.logger.info('listing stopped due to reaching the maximum scanned entries limit',
-                {
-                    maxScannedLifecycleListingEntries: this.maxScannedLifecycleListingEntries,
-                    scannedKeys: this.scannedKeys,
-                });
-            return FILTER_END;
-        }
-        ++this.scannedKeys;
-        return super.filter(obj);
-    }
-
    /**
     * NOTE: Each version of a specific key is sorted from the latest to the oldest
     * thanks to the way version ids are generated.
-     * DESCRIPTION: Skip the version if it represents the master key, but keep its last-modified date in memory,
-     * which will be the stale date of the following version.
+     * DESCRIPTION: For a given key, the latest version is skipped since it represents the current version or
+     * the last version of the previous truncated listing.
+     * The current last-modified date is kept in memory and used as a "stale date" for the following version.
     * The following version is pushed only:
     * - if the "stale date" (picked up from the previous version) is available (JSON.parse has not failed),
     * - if "beforeDate" is not specified or if specified and the "stale date" is older.
@ -97,22 +111,43 @@ class DelimiterNonCurrent extends DelimiterVersions {
     * - no more metadata key is left to be processed
     * - the listing reaches the maximum number of key to be returned
     * - the internal timeout is reached
-     *  @param {String} key   - The key to add
-     *  @param {String} versionId - The version id
+     *  @param {String} keyVersionSuffix   - The key to add
     *  @param {String} value - The value of the key
-     *  @return {undefined}
+     *  @return {number}      - indicates if iteration should continue
     */
-    addVersion(key, versionId, value) {
-        this.nextKeyMarker = key;
-        this.nextVersionIdMarker = versionId;
+    addContents(keyVersionSuffix, value) {
+        if (this._reachedMaxKeys()) {
+            return FILTER_END;
+        }

-        // Skip the version if it represents the non-current version, but keep its last-modified date,
-        // which will be the stale date of the following version.
-        const isCurrentVersion = key !== this.prevKey;
-        if (isCurrentVersion) {
+        if (this.start && Date.now() - this.start > DELIMITER_TIMEOUT_MS) {
+            this.IsTruncated = true;
+            this.logger.info('listing stopped after expected internal timeout',
+                {
+                    timeoutMs: DELIMITER_TIMEOUT_MS,
+                    evaluatedKeys: this.evaluatedKeys,
+                });
+            return FILTER_END;
+        }
+        ++this.evaluatedKeys;
+
+        const versionIdIndex = keyVersionSuffix.indexOf(VID_SEP);
+        const key = keyVersionSuffix.slice(0, versionIdIndex);
+        const versionId = keyVersionSuffix.slice(versionIdIndex + 1);
+
+        this.NextKeyMarker = key;
+        this.NextVersionIdMarker = versionId;
+
+        // For a given key, the latest version is skipped since it represents either:
+        // - the current version or
+        // - the last version of the previous truncated listing
+        const isLatestVersion = key !== this.keyName;
+
+        if (isLatestVersion) {
+            this.keyName = key;
+            // The current last-modified date is kept in memory and used as a "stale date" for the following version.
            this.staleDate = this.getLastModified(value);
-            this.prevKey = key;
-            return;
+            return FILTER_ACCEPT;
        }

        // The following version is pushed only:
@ -130,7 +165,7 @@ class DelimiterNonCurrent extends DelimiterVersions {
                    const s = this._stringify(parsedValue, this.staleDate);
                    // check that _stringify succeeds to only push objects with a defined staleDate.
                    if (s) {
-                        this.Versions.push({ key, value: s });
+                        this.Contents.push({ key, value: s });
                        ++this.keys;
                    }
                }
@ -141,14 +176,9 @@ class DelimiterNonCurrent extends DelimiterVersions {
        // the following version.
        this.staleDate = lastModified || this.getLastModified(value);

-        return;
+        return FILTER_ACCEPT;
    }

-    /**
-     * Parses the stringified entry's value and remove the location property if too large.
-     * @param {string} s - sringified value
-     * @return {object} p - undefined if parsing fails, otherwise it contains the parsed value.
-     */
    _parse(s) {
        let p;
        try {
@ -181,19 +211,14 @@ class DelimiterNonCurrent extends DelimiterVersions {
    }

    result() {
-        const { Versions, IsTruncated, NextKeyMarker, NextVersionIdMarker } = super.result();
-
        const result = {
-            Contents: Versions,
-            IsTruncated,
+            Contents: this.Contents,
+            IsTruncated: this.IsTruncated,
        };

-        if (NextKeyMarker) {
-            result.NextKeyMarker = NextKeyMarker;
-        }
-
-        if (NextVersionIdMarker) {
-            result.NextVersionIdMarker = NextVersionIdMarker;
+        if (this.IsTruncated) {
+            result.NextKeyMarker = this.NextKeyMarker;
+            result.NextVersionIdMarker = this.NextVersionIdMarker;
        }

        return result;
--- a/lib/algos/list/delimiterOrphanDeleteMarker.js
+++ b/lib/algos/list/delimiterOrphanDeleteMarker.js
@ -1,50 +1,45 @@
-const DelimiterVersions = require('./delimiterVersions').DelimiterVersions;
-const { FILTER_END } = require('./tools');
+'use strict'; // eslint-disable-line strict
+const Delimiter = require('./delimiter').Delimiter;
+const VSConst = require('../../versioning/constants').VersioningConstants;
+const { inc, FILTER_ACCEPT, FILTER_END, SKIP_NONE } = require('./tools');
+const VID_SEP = VSConst.VersionId.Separator;
+const { DbPrefixes } = VSConst;
+
+const DELIMITER_TIMEOUT_MS = 10 * 1000; // 10s
 const TRIM_METADATA_MIN_BLOB_SIZE = 10000;
+
 /**
- * Handle object listing with parameters. This extends the base class DelimiterVersions
+ * Handle object listing with parameters. This extends the base class Delimiter
 * to return the orphan delete markers. Orphan delete markers are also
 * refered as expired object delete marker.
 * They are delete marker with zero noncurrent versions.
 */
-class DelimiterOrphanDeleteMarker extends DelimiterVersions {
+class DelimiterOrphanDeleteMarker extends Delimiter {
    /**
-     * Delimiter listing of orphan delete markers.
+     * Delimiter listing of non-current versions.
     * @param {Object}  parameters            - listing parameters
     * @param {String}  parameters.beforeDate - limit the response to keys older than beforeDate
-     * @param {Number} parameters.maxScannedLifecycleListingEntries - max number of entries to be scanned
     * @param {RequestLogger} logger          - The logger of the request
     * @param {String} [vFormat]              - versioning key format
     */
    constructor(parameters, logger, vFormat) {
-        const {
-            marker,
-            maxKeys,
-            prefix,
-            beforeDate,
-            maxScannedLifecycleListingEntries,
-        } = parameters;
+        super(parameters, logger, vFormat);

-        const versionParams = {
-            // The orphan delete marker logic uses the term 'marker' instead of 'keyMarker',
-            // as the latter could suggest the presence of a 'versionIdMarker'.
-            keyMarker: marker,
-            maxKeys,
-            prefix,
-        };
-        super(versionParams, logger, vFormat);
+        this.beforeDate = parameters.beforeDate;
+
+        this.skipping = this.skippingV1;
+        this.genMDParams = this.genMDParamsV1;

-        this.maxScannedLifecycleListingEntries = maxScannedLifecycleListingEntries;
-        this.beforeDate = beforeDate;
-        // this.prevKeyName is used as a marker for the next listing when the current one reaches its entry limit.
-        // We cannot rely on this.keyName, as it contains the name of the current key.
-        // In the event of a listing interruption due to reaching the maximum scanned entries,
-        // relying on this.keyName would cause the next listing to skip the current key because S3 starts
-        // listing after the marker.
-        this.prevKeyName = null;
        this.keyName = null;
+        this.staleDate = null;
        this.value = null;
-        this.scannedKeys = 0;
+
+        // used for monitoring
+        this.evaluatedKeys = 0;
+    }
+
+    skippingV1() {
+        return SKIP_NONE;
    }

    _reachedMaxKeys() {
@ -54,6 +49,28 @@ class DelimiterOrphanDeleteMarker extends DelimiterVersions {
        return false;
    }

+    genMDParamsV1() {
+        const params = {
+            gte: DbPrefixes.Version,
+            lt: inc(DbPrefixes.Version),
+        };
+
+        if (this.prefix) {
+            params.gte = `${DbPrefixes.Version}${this.prefix}`;
+            params.lt = `${DbPrefixes.Version}${inc(this.prefix)}`;
+        }
+
+        if (this.marker && `${DbPrefixes.Version}${this.marker}` >= params.gte) {
+            delete params.gte;
+            params.gt = DbPrefixes.Version
+                    + inc(this.marker + VID_SEP);
+        }
+
+        this.start = Date.now();
+
+        return params;
+    }
+
    _addOrphan() {
        const parsedValue = this._parse(this.value);
        // if parsing fails, skip the key.
@ -64,18 +81,13 @@ class DelimiterOrphanDeleteMarker extends DelimiterVersions {
            if ((!this.beforeDate || (lastModified && lastModified < this.beforeDate)) && isDeleteMarker) {
                // Prefer returning an untrimmed data rather than stopping the service in case of parsing failure.
                const s = this._stringify(parsedValue) || this.value;
-                this.Versions.push({ key: this.keyName, value: s });
-                this.nextKeyMarker = this.keyName;
+                this.Contents.push({ key: this.keyName, value: s });
+                this.NextMarker = this.keyName;
                ++this.keys;
            }
        }
    }

-    /**
-     * Parses the stringified entry's value and remove the location property if too large.
-     * @param {string} s - sringified value
-     * @return {object} p - undefined if parsing fails, otherwise it contains the parsed value.
-     */
    _parse(s) {
        let p;
        try {
@ -106,30 +118,6 @@ class DelimiterOrphanDeleteMarker extends DelimiterVersions {
        }
        return s;
    }
-    /**
-     * The purpose of _isMaxScannedEntriesReached is to restrict the number of scanned entries,
-     * thus controlling resource overhead (CPU...).
-     * @return {boolean} isMaxScannedEntriesReached - true if the maximum limit on the number
-     * of entries scanned has been reached, false otherwise.
-    */
-    _isMaxScannedEntriesReached() {
-        return this.maxScannedLifecycleListingEntries && this.scannedKeys >= this.maxScannedLifecycleListingEntries;
-    }
-
-    filter(obj) {
-        if (this._isMaxScannedEntriesReached()) {
-            this.nextKeyMarker = this.prevKeyName;
-            this.IsTruncated = true;
-            this.logger.info('listing stopped due to reaching the maximum scanned entries limit',
-                {
-                    maxScannedLifecycleListingEntries: this.maxScannedLifecycleListingEntries,
-                    scannedKeys: this.scannedKeys,
-                });
-            return FILTER_END;
-        }
-        ++this.scannedKeys;
-        return super.filter(obj);
-    }

    /**
     * NOTE: Each version of a specific key is sorted from the latest to the oldest
@ -143,62 +131,73 @@ class DelimiterOrphanDeleteMarker extends DelimiterVersions {
     * - the internal timeout is reached
     * NOTE: we cannot leverage MongoDB to list keys older than "beforeDate"
     * because then we will not be able to assess its orphanage.
-     *  @param {String} key   - The object key.
-     * @param {String} versionId   - The object version id.
-     *  @param {String} value - The value of the key
-     *  @return {undefined}
+     *  @param {String} keyVersionSuffix   - The key with version id as a suffix.
+     *  @param {String} value              - The value of the key
+     *  @return {number}                   - indicates if iteration should continue
     */
-    addVersion(key, versionId, value) {
+    addContents(keyVersionSuffix, value) {
+        if (this._reachedMaxKeys()) {
+            return FILTER_END;
+        }
+
+        if (this.start && Date.now() - this.start > DELIMITER_TIMEOUT_MS) {
+            this.IsTruncated = true;
+            this.NextMarker = this.keyName;
+
+            this.logger.info('listing stopped after expected internal timeout',
+                {
+                    timeoutMs: DELIMITER_TIMEOUT_MS,
+                    evaluatedKeys: this.evaluatedKeys,
+                });
+            return FILTER_END;
+        }
+        ++this.evaluatedKeys;
+
+        const versionIdIndex = keyVersionSuffix.indexOf(VID_SEP);
+        // key without version suffix
+        const key = keyVersionSuffix.slice(0, versionIdIndex);
+
        // For a given key, the youngest version is kept in memory since it represents the current version.
        if (key !== this.keyName) {
            // If this.value is defined, it means that <this.keyName, this.value> pair is "allowed" to be an orphan.
            if (this.value) {
                this._addOrphan();
            }
-            this.prevKeyName = this.keyName;
            this.keyName = key;
            this.value = value;

-            return;
+            return FILTER_ACCEPT;
        }

-        // If the key is not the current version, we can skip it in the next listing
-        // in the case where the current listing is interrupted due to reaching the maximum scanned entries.
-        this.prevKeyName = key;
        this.keyName = key;
        this.value = null;

-        return;
+        return FILTER_ACCEPT;
    }

    result() {
-        // Only check for remaining last orphan delete marker if the listing is not interrupted.
-        // This will help avoid false positives.
-        if (!this._isMaxScannedEntriesReached()) {
-            // The following check makes sure the last orphan delete marker is not forgotten.
-            if (this.keys < this.maxKeys) {
-                if (this.value) {
-                    this._addOrphan();
-                }
-            // The following make sure that if makeKeys is reached, isTruncated is set to true.
-            // We moved the "isTruncated" from _reachedMaxKeys to make sure we take into account the last entity
-            // if listing is truncated right before the last entity and the last entity is a orphan delete marker.
-            } else {
-                this.IsTruncated = this.maxKeys > 0;
+        // The following check makes sure the last orphan delete marker is not forgotten.
+        if (this.keys < this.maxKeys) {
+            if (this.value) {
+                this._addOrphan();
            }
+        // The following make sure that if makeKeys is reached, isTruncated is set to true.
+        // We moved the "isTruncated" from _reachedMaxKeys to make sure we take into account the last entity
+        // if listing is truncated right before the last entity and the last entity is a orphan delete marker.
+        } else {
+            this.IsTruncated = this.maxKeys > 0;
        }

        const result = {
-            Contents: this.Versions,
+            Contents: this.Contents,
            IsTruncated: this.IsTruncated,
        };

        if (this.IsTruncated) {
-            result.NextMarker = this.nextKeyMarker;
+            result.NextMarker = this.NextMarker;
        }

        return result;
    }
 }
-
 module.exports = { DelimiterOrphanDeleteMarker };
--- a/lib/algos/list/delimiterVersions.ts
+++ b/lib/algos/list/delimiterVersions.ts
@ -1,12 +1,6 @@
 'use strict'; // eslint-disable-line strict

-const Extension = require('./Extension').default;
-
-import {
-    FilterState,
-    FilterReturnValue,
-} from './delimiter';
-
+const Delimiter = require('./delimiter').Delimiter;
 const Version = require('../../versioning/Version').Version;
 const VSConst = require('../../versioning/constants').VersioningConstants;
 const { inc, FILTER_END, FILTER_ACCEPT, FILTER_SKIP, SKIP_NONE } =
@ -15,10 +9,24 @@ const { inc, FILTER_END, FILTER_ACCEPT, FILTER_SKIP, SKIP_NONE } =
 const VID_SEP = VSConst.VersionId.Separator;
 const { DbPrefixes, BucketVersioningKeyFormat } = VSConst;

+// TODO: when S3C-4682 code is back, cleanup fields, methods and types
+// already present in Delimiter class
+
+export interface FilterState {
+    id: number,
+};
+
+export interface FilterReturnValue {
+    FILTER_ACCEPT,
+    FILTER_SKIP,
+    FILTER_END,
+};
+
 export const enum DelimiterVersionsFilterStateId {
    NotSkipping = 1,
    SkippingPrefix = 2,
-    SkippingVersions = 3,
+    WaitForNullKey = 3,
+    SkippingVersions = 4,
 };

 export interface DelimiterVersionsFilterState_NotSkipping extends FilterState {
@ -30,12 +38,16 @@ export interface DelimiterVersionsFilterState_SkippingPrefix extends FilterState
    prefix: string;
 };

+export interface DelimiterVersionsFilterState_WaitForNullKey extends FilterState {
+    id: DelimiterVersionsFilterStateId.WaitForNullKey,
+};
+
 export interface DelimiterVersionsFilterState_SkippingVersions extends FilterState {
    id: DelimiterVersionsFilterStateId.SkippingVersions,
    gt: string;
 };

-type KeyHandler = (key: string, versionId: string | undefined, value: string) => FilterReturnValue;
+type KeyHandler = (key: string, value: string) => FilterReturnValue;

 type ResultObject = {
    CommonPrefixes: string[],
@ -68,17 +80,13 @@ type GenMDParamsItem = {
 * @prop {String|undefined} prefix     - prefix per amazon format
 * @prop {Number} maxKeys              - number of keys to list
 */
-export class DelimiterVersions extends Extension {
+export class DelimiterVersions extends Delimiter {

    state: FilterState;
    keyHandlers: { [id: number]: KeyHandler };

    constructor(parameters, logger, vFormat) {
-        super(parameters, logger);
-        // original listing parameters
-        this.delimiter = parameters.delimiter;
-        this.prefix = parameters.prefix;
-        this.maxKeys = parameters.maxKeys || 1000;
+        super(parameters, logger, vFormat);
        // specific to version listing
        this.keyMarker = parameters.keyMarker;
        this.versionIdMarker = parameters.versionIdMarker;
@ -86,11 +94,7 @@ export class DelimiterVersions extends Extension {
        this.masterKey = undefined;
        this.masterVersionId = undefined;
        this.nullKey = null;
-        this.vFormat = vFormat || BucketVersioningKeyFormat.v0;
        // listing results
-        this.CommonPrefixes = [];
-        this.Versions = [];
-        this.IsTruncated = false;
        this.nextKeyMarker = parameters.keyMarker;
        this.nextVersionIdMarker = undefined;

@ -122,14 +126,17 @@ export class DelimiterVersions extends Extension {
            DelimiterVersionsFilterStateId.SkippingPrefix,
            this.keyHandler_SkippingPrefix.bind(this));

+        this.setKeyHandler(
+            DelimiterVersionsFilterStateId.WaitForNullKey,
+            this.keyHandler_WaitForNullKey.bind(this));
+
        this.setKeyHandler(
            DelimiterVersionsFilterStateId.SkippingVersions,
            this.keyHandler_SkippingVersions.bind(this));

        if (this.versionIdMarker) {
-            this.state = <DelimiterVersionsFilterState_SkippingVersions> {
-                id: DelimiterVersionsFilterStateId.SkippingVersions,
-                gt: `${this.keyMarker}${VID_SEP}${this.versionIdMarker}`,
+            this.state = <DelimiterVersionsFilterState_WaitForNullKey> {
+                id: DelimiterVersionsFilterStateId.WaitForNullKey,
            };
        } else {
            this.state = <DelimiterVersionsFilterState_NotSkipping> {
@ -194,20 +201,6 @@ export class DelimiterVersions extends Extension {
        return [mParams, vParams];
    }

-    /**
-     * check if the max keys count has been reached and set the
-     * final state of the result if it is the case
-     * @return {Boolean} - indicates if the iteration has to stop
-     */
-    _reachedMaxKeys(): boolean {
-        if (this.keys >= this.maxKeys) {
-            // In cases of maxKeys <= 0 -> IsTruncated = false
-            this.IsTruncated = this.maxKeys > 0;
-            return true;
-        }
-        return false;
-    }
-
    /**
     * Used to synchronize listing of M and V prefixes by object key
     *
@ -243,30 +236,6 @@ export class DelimiterVersions extends Extension {
        return { key: nonversionedKey, versionId };
    }

-    /**
-     * Include a key in the listing output, in the Versions or CommonPrefix result
-     *
-     * @param {string} key - key (without version ID)
-     * @param {string} versionId - version ID
-     * @param {string} value - metadata value
-     * @return {undefined}
-     */
-    addKey(key: string, versionId: string, value: string) {
-        // add the subprefix to the common prefixes if the key has the delimiter
-        const commonPrefix = this.getCommonPrefix(key);
-        if (commonPrefix) {
-            this.addCommonPrefix(commonPrefix);
-            // transition into SkippingPrefix state to skip all following keys
-            // while they start with the same prefix
-            this.setState(<DelimiterVersionsFilterState_SkippingPrefix> {
-                id: DelimiterVersionsFilterStateId.SkippingPrefix,
-                prefix: commonPrefix,
-            });
-        } else {
-            this.addVersion(key, versionId, value);
-        }
-    }
-
    /**
     *  Add a (key, versionId, value) tuple to the listing.
     *  Set the NextMarker to the current key
@ -276,8 +245,8 @@ export class DelimiterVersions extends Extension {
     *  @param {String} value       - The value of the key
     *  @return {undefined}
     */
-    addVersion(key: string, versionId: string, value: string) {
-        this.Versions.push({
+    addContents(key: string, versionId: string, value: string) {
+        this.Contents.push({
            key,
            versionId,
            value: this.trimMetadata(value),
@ -309,7 +278,6 @@ export class DelimiterVersions extends Extension {
        this.CommonPrefixes.push(commonPrefix);
        ++this.keys;
        this.nextKeyMarker = commonPrefix;
-        this.nextVersionIdMarker = undefined;
    }

    /**
@ -325,6 +293,21 @@ export class DelimiterVersions extends Extension {
        this.nullKey = { key, versionId, value };
    }

+    /**
+     * Add the cached null key to the results. This is called when
+     * reaching the correct position for the null key in the output.
+     *
+     * @return {undefined}
+     */
+    addCurrentNullKey(): void {
+        this.addContents(
+            this.nullKey.key,
+            this.nullKey.versionId,
+            this.nullKey.value,
+        );
+        this.nullKey = null;
+    }
+
    getObjectKeyV0(obj: { key: string }): string {
        return obj.key;
    }
@ -348,24 +331,7 @@ export class DelimiterVersions extends Extension {
        const key = this.getObjectKey(obj);
        const value = obj.value;

-        const { key: nonversionedKey, versionId: keyVersionId } = this.parseKey(key);
-        if (this.nullKey) {
-            if (this.nullKey.key !== nonversionedKey
-                || this.nullKey.versionId < <string> keyVersionId) {
-                this.handleKey(
-                    this.nullKey.key, this.nullKey.versionId, this.nullKey.value);
-                this.nullKey = null;
-            }
-        }
-        if (keyVersionId === '') {
-            // null key
-            this.cacheNullKey(nonversionedKey, Version.from(value).getVersionId(), value);
-            if (this.state.id === DelimiterVersionsFilterStateId.SkippingVersions) {
-                return FILTER_SKIP;
-            }
-            return FILTER_ACCEPT;
-        }
-        return this.handleKey(nonversionedKey, keyVersionId, value);
+        return this.handleKey(key, value);
    }

    setState(state: FilterState): void {
@ -376,11 +342,11 @@ export class DelimiterVersions extends Extension {
        this.keyHandlers[stateId] = keyHandler;
    }

-    handleKey(key: string, versionId: string | undefined, value: string): FilterReturnValue {
-        return this.keyHandlers[this.state.id](key, versionId, value);
+    handleKey(key: string, value: string): FilterReturnValue {
+        return this.keyHandlers[this.state.id](key, value);
    }

-    keyHandler_NotSkippingV0(key: string, versionId: string | undefined, value: string): FilterReturnValue {
+    keyHandler_NotSkippingV0(key: string, value: string): FilterReturnValue {
        if (key.startsWith(DbPrefixes.Replay)) {
            // skip internal replay prefix entirely
            this.setState(<DelimiterVersionsFilterState_SkippingPrefix> {
@ -392,37 +358,68 @@ export class DelimiterVersions extends Extension {
        if (Version.isPHD(value)) {
            return FILTER_ACCEPT;
        }
-        return this.filter_onNewKey(key, versionId, value);
+        return this.filter_onNewKey(key, value);
    }

-    keyHandler_NotSkippingV1(key: string, versionId: string | undefined, value: string): FilterReturnValue {
+    keyHandler_NotSkippingV1(key: string, value: string): FilterReturnValue {
        // NOTE: this check on PHD is only useful for Artesca, S3C
        // does not use PHDs in V1 format
        if (Version.isPHD(value)) {
            return FILTER_ACCEPT;
        }
-        return this.filter_onNewKey(key, versionId, value);
+        return this.filter_onNewKey(key, value);
    }

-    filter_onNewKey(key: string, versionId: string | undefined, value: string): FilterReturnValue {
+    filter_onNewKey(key: string, value: string): FilterReturnValue {
        if (this._reachedMaxKeys()) {
            return FILTER_END;
        }
-        if (versionId === undefined) {
+        const { key: nonversionedKey, versionId: keyVersionId } = this.parseKey(key);
+        if (this.nullKey &&
+            (this.nullKey.key !== nonversionedKey
+             || this.nullKey.versionId < <string> keyVersionId)) {
+            this.addCurrentNullKey();
+            if (this._reachedMaxKeys()) {
+                // IsTruncated: true is set, which is wanted because
+                // there is at least one more key to output: the one
+                // being processed here
+                return FILTER_END;
+            }
+        }
+        let versionId: string;
+        if (keyVersionId === undefined) {
            this.masterKey = key;
            this.masterVersionId = Version.from(value).getVersionId() || 'null';
-            this.addKey(this.masterKey, this.masterVersionId, value);
+            versionId = this.masterVersionId;
        } else {
-            if (this.masterKey === key && this.masterVersionId === versionId) {
+            if (keyVersionId === '') {
+                // null key
+                this.cacheNullKey(nonversionedKey, Version.from(value).getVersionId(), value);
+                return FILTER_ACCEPT;
+            }
+            if (this.masterKey === nonversionedKey && this.masterVersionId === keyVersionId) {
                // do not add a version key if it is the master version
                return FILTER_ACCEPT;
            }
-            this.addKey(key, versionId, value);
+            versionId = keyVersionId;
        }
+        // add the subprefix to the common prefixes if the key has the delimiter
+        const commonPrefix = this.getCommonPrefix(nonversionedKey);
+        if (commonPrefix) {
+            this.addCommonPrefix(commonPrefix);
+            // transition into SkippingPrefix state to skip all following keys
+            // while they start with the same prefix
+            this.setState(<DelimiterVersionsFilterState_SkippingPrefix> {
+                id: DelimiterVersionsFilterStateId.SkippingPrefix,
+                prefix: commonPrefix,
+            });
+            return FILTER_ACCEPT;
+        }
+        this.addContents(nonversionedKey, versionId, value);
        return FILTER_ACCEPT;
    }

-    keyHandler_SkippingPrefix(key: string, versionId: string | undefined, value: string): FilterReturnValue {
+    keyHandler_SkippingPrefix(key: string, value: string): FilterReturnValue {
        const { prefix } = <DelimiterVersionsFilterState_SkippingPrefix> this.state;
        if (key.startsWith(prefix)) {
            return FILTER_SKIP;
@ -430,11 +427,39 @@ export class DelimiterVersions extends Extension {
        this.setState(<DelimiterVersionsFilterState_NotSkipping> {
            id: DelimiterVersionsFilterStateId.NotSkipping,
        });
-        return this.handleKey(key, versionId, value);
+        return this.handleKey(key, value);
    }

-    keyHandler_SkippingVersions(key: string, versionId: string | undefined, value: string): FilterReturnValue {
-        if (key === this.keyMarker) {
+    keyHandler_WaitForNullKey(key: string, value: string): FilterReturnValue {
+        const { key: nonversionedKey, versionId } = this.parseKey(key);
+        if (nonversionedKey !== this.keyMarker) {
+            this.setState(<DelimiterVersionsFilterState_NotSkipping> {
+                id: DelimiterVersionsFilterStateId.NotSkipping,
+            });
+            return this.handleKey(key, value);
+        }
+        // we may now skip versions until VersionIdMarker
+        this.setState(<DelimiterVersionsFilterState_SkippingVersions> {
+            id: DelimiterVersionsFilterStateId.SkippingVersions,
+            gt: `${this.keyMarker}${VID_SEP}${this.versionIdMarker}`,
+        });
+
+        if (versionId === '') {
+            // only cache the null key if its version is older than
+            // the current version ID marker, otherwise it has already
+            // been output in a previous listing output
+            const nullVersionId = Version.from(value).getVersionId();
+            if (nullVersionId > this.versionIdMarker) {
+                this.cacheNullKey(nonversionedKey, nullVersionId, value);
+            }
+            return FILTER_SKIP;
+        }
+        return this.handleKey(key, value);
+    }
+
+    keyHandler_SkippingVersions(key: string, value: string): FilterReturnValue {
+        const { key: nonversionedKey, versionId } = this.parseKey(key);
+        if (nonversionedKey === this.keyMarker) {
            // since the nonversioned key equals the marker, there is
            // necessarily a versionId in this key
            const _versionId = <string> versionId;
@ -450,21 +475,18 @@ export class DelimiterVersions extends Extension {
        this.setState(<DelimiterVersionsFilterState_NotSkipping> {
            id: DelimiterVersionsFilterStateId.NotSkipping,
        });
-        return this.handleKey(key, versionId, value);
+        return this.handleKey(key, value);
    }

-    skippingBase(): string | undefined {
+    skippingBase() {
        switch (this.state.id) {
        case DelimiterVersionsFilterStateId.SkippingPrefix:
            const { prefix } = <DelimiterVersionsFilterState_SkippingPrefix> this.state;
-            return inc(prefix);
+            return prefix;

        case DelimiterVersionsFilterStateId.SkippingVersions:
            const { gt } = <DelimiterVersionsFilterState_SkippingVersions> this.state;
-            // the contract of skipping() is to return the first key
-            // that can be skipped to, so adding a null byte to skip
-            // over the existing versioned key set in 'gt'
-            return `${gt}\0`;
+            return gt;

        default:
            return SKIP_NONE;
@ -511,12 +533,12 @@ export class DelimiterVersions extends Extension {
        //   does not fit, so we know the result is now truncated
        //   because there remains the null key to be output.
        //
-        if (this.nullKey) {
-            this.handleKey(this.nullKey.key, this.nullKey.versionId, this.nullKey.value);
+        if (this.nullKey && !this._reachedMaxKeys()) {
+            this.addCurrentNullKey();
        }
        const result: ResultObject = {
            CommonPrefixes: this.CommonPrefixes,
-            Versions: this.Versions,
+            Versions: this.Contents,
            IsTruncated: this.IsTruncated,
        };
        if (this.delimiter) {
--- a/lib/algos/list/skip.js
+++ b/lib/algos/list/skip.js
@ -52,21 +52,21 @@ class Skip {
        assert(this.skipRangeCb);

        const filteringResult = this.extension.filter(entry);
-        const skipTo = this.extension.skipping();
+        const skippingRange = this.extension.skipping();

        if (filteringResult === FILTER_END) {
            this.listingEndCb();
        } else if (filteringResult === FILTER_SKIP
-                   && skipTo !== SKIP_NONE) {
+                   && skippingRange !== SKIP_NONE) {
            if (++this.streakLength >= MAX_STREAK_LENGTH) {
                let newRange;
-                if (Array.isArray(skipTo)) {
+                if (Array.isArray(skippingRange)) {
                    newRange = [];
-                    for (let i = 0; i < skipTo.length; ++i) {
-                        newRange.push(skipTo[i]);
+                    for (let i = 0; i < skippingRange.length; ++i) {
+                        newRange.push(this._inc(skippingRange[i]));
                    }
                } else {
-                    newRange = skipTo;
+                    newRange = this._inc(skippingRange);
                }
                /* Avoid to loop on the same range again and again. */
                if (newRange === this.gteParams) {
@ -79,6 +79,16 @@ class Skip {
            this.streakLength = 0;
        }
    }
+
+    _inc(str) {
+        if (!str) {
+            return str;
+        }
+        const lastCharValue = str.charCodeAt(str.length - 1);
+        const lastCharNewValue = String.fromCharCode(lastCharValue + 1);
+
+        return `${str.slice(0, str.length - 1)}${lastCharNewValue}`;
+    }
 }


--- a/lib/auth/Vault.ts
+++ b/lib/auth/Vault.ts
@ -14,7 +14,7 @@ function vaultSignatureCb(
    err: Error | null,
    authInfo: { message: { body: any } },
    log: Logger,
-    callback: (err: Error | null, data?: any, results?: any, params?: any, infos?: any) => void,
+    callback: (err: Error | null, data?: any, results?: any, params?: any) => void,
    streamingV4Params?: any
 ) {
    // vaultclient API guarantees that it returns:
@ -38,9 +38,7 @@ function vaultSignatureCb(
    }
    // @ts-ignore
    log.addDefaultFields(auditLog);
-    return callback(null, userInfo, authorizationResults, streamingV4Params, {
-        accountQuota: info.accountQuota || {},
-    });
+    return callback(null, userInfo, authorizationResults, streamingV4Params);
 }

 export type AuthV4RequestParams = {
@ -386,19 +384,4 @@ export default class Vault {
            return callback(null, respBody);
        });
    }
-
-    report(log: Logger, callback: (err: Error | null, data?: any) => void) {
-        // call the report function of the client
-        if (!this.client.report) {
-            return callback(null, {});
-        }
-        // @ts-ignore
-        return this.client.report(log.getSerializedUids(), (err: Error | null, obj?: any) => {
-            if (err) {
-                log.debug(`error from ${this.implName}`, { error: err });
-                return callback(err);
-            }
-            return callback(null, obj);
-        });
-    }
 }
--- a/lib/auth/auth.ts
+++ b/lib/auth/auth.ts
@ -163,20 +163,6 @@ function doAuth(
    return cb(errors.InternalError);
 }

-/**
- * This function will generate a version 4 content-md5 header
- * It looks at the request path to determine what kind of header encoding is required
- *
- * @param path - the request path
- * @param payload - the request payload to hash
- */
-function generateContentMD5Header(
-    path: string,
-    payload: string,
-) {
-    const encoding = path && path.startsWith('/_/backbeat/') ? 'hex' : 'base64';
-    return crypto.createHash('md5').update(payload, 'binary').digest(encoding);
-}
 /**
 * This function will generate a version 4 header
 *
@ -189,7 +175,6 @@ function generateContentMD5Header(
 * @param [proxyPath] - path that gets proxied by reverse proxy
 * @param [sessionToken] - security token if the access/secret keys
 *                                are temporary credentials from STS
- * @param [payload] - body of the request if any
 */
 function generateV4Headers(
    request: any,
@ -197,9 +182,8 @@ function generateV4Headers(
    accessKey: string,
    secretKeyValue: string,
    awsService: string,
-    proxyPath?: string,
-    sessionToken?: string,
-    payload?: string,
+    proxyPath: string,
+    sessionToken: string
 ) {
    Object.assign(request, { headers: {} });
    const amzDate = convertUTCtoISO8601(Date.now());
@ -212,7 +196,7 @@ function generateV4Headers(
    const timestamp = amzDate;
    const algorithm = 'AWS4-HMAC-SHA256';

-    payload = payload || '';
+    let payload = '';
    if (request.method === 'POST') {
        payload = queryString.stringify(data, undefined, undefined, {
            encodeURIComponent,
@ -223,7 +207,6 @@ function generateV4Headers(
    request.setHeader('host', request._headers.host);
    request.setHeader('x-amz-date', amzDate);
    request.setHeader('x-amz-content-sha256', payloadChecksum);
-    request.setHeader('content-md5', generateContentMD5Header(request.path, payload));

    if (sessionToken) {
        request.setHeader('x-amz-security-token', sessionToken);
@ -234,7 +217,6 @@ function generateV4Headers(
        .filter(headerName =>
            headerName.startsWith('x-amz-')
            || headerName.startsWith('x-scal-')
-            || headerName === 'content-md5'
            || headerName === 'host',
        ).sort().join(';');
    const params = { request, signedHeaders, payloadChecksum,
--- a/lib/auth/backends/ChainBackend.ts
+++ b/lib/auth/backends/ChainBackend.ts
@ -134,7 +134,7 @@ export default class ChainBackend extends BaseBackend {
            }

            const check = (policy) => {
-                const key = (policy.arn || '') + (policy.versionId || '') + (policy.action || '');
+                const key = (policy.arn || '') + (policy.versionId || '');
                if (!policyMap[key] || !policyMap[key].isAllowed) {
                    policyMap[key] = policy;
                }
@ -158,12 +158,6 @@ export default class ChainBackend extends BaseBackend {
            if (policyMap[key].versionId) {
                policyRes.versionId = policyMap[key].versionId;
            }
-            if (policyMap[key].isImplicit !== undefined) {
-                policyRes.isImplicit = policyMap[key].isImplicit;
-            }
-            if (policyMap[key].action) {
-                policyRes.action = policyMap[key].action;
-            }
            return policyRes;
        });
    }
@ -212,22 +206,4 @@ export default class ChainBackend extends BaseBackend {
            return callback(null, res);
        });
    }
-
-    report(reqUid: string, callback: any) {
-        this._forEachClient((client, done) =>
-            client.report(reqUid, done),
-            (err, res) => {
-                if (err) {
-                    return callback(err);
-                }
-                const mergedRes = res.reduce((acc, val) => {
-                    Object.keys(val).forEach(k => {
-                        acc[k] = val[k];
-                    });
-                    return acc;
-                }, {});
-
-                return callback(null, mergedRes);
-            });
-    }
 }
--- a/lib/auth/backends/in_memory/Backend.ts
+++ b/lib/auth/backends/in_memory/Backend.ts
@ -161,10 +161,6 @@ class InMemoryBackend extends BaseBackend {
        };
        return cb(null, vaultReturnObject);
    }
-
-    report(log: Logger, callback: any) {
-        return callback(null, {});
-    }
 }


--- a/lib/clustering/ClusterRPC.ts
+++ b/lib/clustering/ClusterRPC.ts
@ -1,569 +0,0 @@
-import cluster, { Worker } from 'cluster';
-import * as werelogs from 'werelogs';
-
-import { default as errors } from '../../lib/errors';
-
-const rpcLogger = new werelogs.Logger('ClusterRPC');
-
-/**
- * Remote procedure calls support between cluster workers.
- *
- * When using the cluster module, new processes are forked and are
- * dispatched workloads, usually HTTP requests. The ClusterRPC module
- * implements a RPC system to send commands to all cluster worker
- * processes at once from any particular worker, and retrieve their
- * individual command results, like a distributed map operation.
- *
- * The existing nodejs cluster IPC channel is setup from the primary
- * to each worker, but not between workers, so there has to be a hop
- * by the primary.
- *
- * How a command is treated:
- *
- * - a worker sends a command message to the primary
- *
- * - the primary then forwards that command to each existing worker
- *   (including the requestor)
- *
- * - each worker then executes the command and returns a result or an
- *   error
- *
- * - the primary gathers all workers results into an array
- *
- * - finally, the primary dispatches the results array to the original
- *   requesting worker
- *
- *
- * Limitations:
- *
- * - The command payload must be serializable, which means that:
- *   - it should not contain circular references
- *   - it should be of a reasonable size to be sent in a single RPC message
- *
- * - The "toWorkers" parameter of value "*" targets the set of workers
- *   that are available at the time the command is dispatched. Any new
- *   worker spawned after the command has been dispatched for
- *   processing, but before the command completes, don't execute
- *   the command and hence are not part of the results array.
- *
- *
- * To set it up:
- *
- * - On the primary:
- *     if (cluster.isPrimary) {
- *         setupRPCPrimary();
- *     }
- *
- * - On the workers:
- *     if (!cluster.isPrimary) {
- *         setupRPCWorker({
- *             handler1: (payload: object, uids: string, callback: HandlerCallback) => void,
- *             handler2: ...
- *         });
- *     }
- *     Handler functions will be passed the command payload, request
- *     serialized uids, and must call the callback when the worker is done
- *     processing the command:
- *         callback(error: Error | null | undefined, result?: any)
- *
- * When this setup is done, any worker can start sending commands by calling
- * the async function sendWorkerCommand().
- */
-
-// exported types
-
-export type ResultObject = {
-    error: Error | null;
-    result: any;
-};
-
-/**
- * saved Promise for sendWorkerCommand
- */
-export type CommandPromise = {
-    resolve: (results?: ResultObject[]) => void;
-    reject: (error: Error) => void;
-    timeout: NodeJS.Timeout | null;
-};
-export type HandlerCallback = (error: (Error & { code?: number }) | null | undefined, result?: any) => void;
-export type HandlerFunction = (payload: object, uids: string, callback: HandlerCallback) => void;
-export type HandlersMap = {
-    [index: string]: HandlerFunction;
-};
-export type PrimaryHandlerFunction = (worker: Worker, payload: object, uids: string, callback: HandlerCallback) => void;
-export type PrimaryHandlersMap = Record<string, PrimaryHandlerFunction>;
-
-// private types
-
-type RPCMessage<T extends string, P> = {
-    type: T;
-    uids: string;
-    payload: P;
-};
-
-type RPCCommandMessage = RPCMessage<'cluster-rpc:command', any> & {
-    toWorkers: string;
-    toHandler: string;
-};
-
-type MarshalledResultObject = {
-    error: string | null;
-    errorCode?: number;
-    result: any;
-};
-
-type RPCCommandResultMessage = RPCMessage<'cluster-rpc:commandResult', MarshalledResultObject>;
-
-type RPCCommandResultsMessage = RPCMessage<'cluster-rpc:commandResults', {
-    results: MarshalledResultObject[];
-}>;
-
-type RPCCommandErrorMessage = RPCMessage<'cluster-rpc:commandError', {
-    error: string;
-}>;
-
-interface RPCSetupOptions {
-    /**
-     * As werelogs is not a peerDependency, arsenal and a parent project
-     * might have their own separate versions duplicated in dependencies.
-     * The config are therefore not shared.
-     * Use this to propagate werelogs config to arsenal's ClusterRPC.
-     */
-    werelogsConfig?: Parameters<typeof werelogs.configure>[0];
-};
-
-/**
- * In primary: store worker IDs that are waiting to be dispatched
- * their command's results, as a mapping.
- */
-const uidsToWorkerId: {
-    [index: string]: number;
-} = {};
-
-
-/**
- * In primary: store worker responses for commands in progress as a
- * mapping.
- *
- * Result objects are 'null' while the worker is still processing the
- * command. When a worker finishes processing it stores the result as:
- *    {
- *        error: string | null,
- *        result: any
- *    }
- */
-const uidsToCommandResults: {
-    [index: string]: {
-        [index: number]: MarshalledResultObject | null;
-    };
-} = {};
-
-/**
- * In workers: store promise callbacks for commands waiting to be
- * dispatched, as a mapping.
- */
-const uidsToCommandPromise: {
-    [index: string]: CommandPromise;
-} = {};
-
-
-function _isRpcMessage(message) {
-    return (message !== null &&
-            typeof message === 'object' &&
-            typeof message.type === 'string' &&
-            message.type.startsWith('cluster-rpc:'));
-}
-
-/**
- * Setup cluster RPC system on the primary
- *
- * @param {object} [handlers] - mapping of handler names to handler functions
- *     handler function:
- *         `handler({Worker} worker, {object} payload, {string} uids, {function} callback)`
- *     handler callback must be called when worker is done with the command:
- *         `callback({Error|null} error, {any} [result])`
- * @return {undefined}
- */
-export function setupRPCPrimary(handlers?: PrimaryHandlersMap, options?: RPCSetupOptions) {
-    if (options?.werelogsConfig) {
-        werelogs.configure(options.werelogsConfig);
-    }
-    cluster.on('message', (worker, message) => {
-        if (_isRpcMessage(message)) {
-            _handlePrimaryMessage(worker, message, handlers);
-        }
-    });
-}
-
-/**
- * Setup RPCs on a cluster worker process
- *
- * @param {object} handlers - mapping of handler names to handler functions
- *     handler function:
- *         handler({object} payload, {string} uids, {function} callback)
- *     handler callback must be called when worker is done with the command:
- *         callback({Error|null} error, {any} [result])
- * @return {undefined}
- * }
- */
-export function setupRPCWorker(handlers: HandlersMap, options?: RPCSetupOptions) {
-    if (!process.send) {
-        throw new Error('fatal: cannot setup cluster RPC: "process.send" is not available');
-    }
-    if (options?.werelogsConfig) {
-        werelogs.configure(options.werelogsConfig);
-    }
-    process.on('message', (message: RPCCommandMessage | RPCCommandResultsMessage) => {
-        if (_isRpcMessage(message)) {
-            _handleWorkerMessage(message, handlers);
-        }
-    });
-}
-
-/**
- * Send a command for workers to execute in parallel, and wait for results
- *
- * @param {string} toWorkers - which workers should execute the command
- *     Currently the supported values are:
- *         - "*", meaning all workers will execute the command
- *         - "PRIMARY", meaning primary process will execute the command
- * @param {string} toHandler - name of handler that will execute the
- * command in workers, as declared in setupRPCWorker() parameter object
- * @param {string} uids - unique identifier of the command, must be
- * unique across all commands in progress
- * @param {object} payload - message payload, sent as-is to the handler
- * @param {number} [timeoutMs=60000] - timeout the command with a
- * "RequestTimeout" error after this number of milliseconds - set to 0
- * to disable timeouts (the command may then hang forever)
- * @returns {Promise}
- */
-export async function sendWorkerCommand(
-    toWorkers: string,
-    toHandler: string,
-    uids: string,
-    payload: object,
-    timeoutMs: number = 60000
-) {
-    if (typeof uids !== 'string') {
-        rpcLogger.error('missing or invalid "uids" field', { uids });
-        throw errors.MissingParameter;
-    }
-    if (uidsToCommandPromise[uids] !== undefined) {
-        rpcLogger.error('a command is already in progress with same uids', { uids });
-        throw errors.OperationAborted;
-    }
-    rpcLogger.info('sending command', { toWorkers, toHandler, uids, payload });
-    return new Promise((resolve, reject) => {
-        let timeout: NodeJS.Timeout | null = null;
-        if (timeoutMs) {
-            timeout = setTimeout(() => {
-                delete uidsToCommandPromise[uids];
-                reject(errors.RequestTimeout);
-            }, timeoutMs);
-        }
-        uidsToCommandPromise[uids] = { resolve, reject, timeout };
-        const message: RPCCommandMessage = {
-            type: 'cluster-rpc:command',
-            toWorkers,
-            toHandler,
-            uids,
-            payload,
-        };
-        return process.send?.(message);
-    });
-}
-
-/**
- * Get the number of commands in flight
- * @returns {number}
- */
-export function getPendingCommandsCount() {
-    return Object.keys(uidsToCommandPromise).length;
-}
-
-
-function _dispatchCommandResultsToWorker(
-    worker: Worker,
-    uids: string,
-    resultsArray: MarshalledResultObject[]
-): void {
-    const message: RPCCommandResultsMessage = {
-        type: 'cluster-rpc:commandResults',
-        uids,
-        payload: {
-            results: resultsArray,
-        },
-    };
-    worker.send(message);
-}
-
-function _dispatchCommandErrorToWorker(
-    worker: Worker,
-    uids: string,
-    error: Error,
-): void {
-    const message: RPCCommandErrorMessage = {
-        type: 'cluster-rpc:commandError',
-        uids,
-        payload: {
-            error: error.message,
-        },
-    };
-    worker.send(message);
-}
-
-function _sendPrimaryCommandResult(
-    worker: Worker,
-    uids: string,
-    error: (Error & { code?: number }) | null | undefined,
-    result?: any
-): void {
-    const message: RPCCommandResultsMessage = {
-        type: 'cluster-rpc:commandResults',
-        uids,
-        payload: {
-            results: [{ error: error?.message || null, errorCode: error?.code, result }],
-        },
-    };
-    worker.send?.(message);
-}
-
-function _handlePrimaryCommandMessage(
-    fromWorker: Worker,
-    logger: any,
-    message: RPCCommandMessage,
-    handlers?: PrimaryHandlersMap
-): void {
-    const { toWorkers, toHandler, uids, payload } = message;
-    if (toWorkers === '*') {
-        if (uidsToWorkerId[uids] !== undefined) {
-            logger.warn('new command already has a waiting worker with same uids', {
-                uids, workerId: uidsToWorkerId[uids],
-            });
-            return undefined;
-        }
-        const commandResults = {};
-        for (const workerId of Object.keys(cluster.workers || {})) {
-            commandResults[workerId] = null;
-        }
-        uidsToWorkerId[uids] = fromWorker?.id;
-        uidsToCommandResults[uids] = commandResults;
-
-        for (const [workerId, worker] of Object.entries(cluster.workers || {})) {
-            logger.debug('sending command message to worker', {
-                workerId, toHandler, payload,
-            });
-            if (worker) {
-                worker.send(message);
-            }
-        }
-    } else if (toWorkers === 'PRIMARY') {
-        const { toHandler, uids, payload } = message;
-        const cb: HandlerCallback = (err, result) => _sendPrimaryCommandResult(fromWorker, uids, err, result);
-
-        if (toHandler in (handlers || {})) {
-            return handlers![toHandler](fromWorker, payload, uids, cb);
-        }
-        logger.error('no such handler in "toHandler" field from worker command message', {
-            toHandler,
-        });
-        return cb(errors.NotImplemented);
-    } else {
-        logger.error('unsupported "toWorkers" field from worker command message', {
-            toWorkers,
-        });
-        if (fromWorker) {
-            _dispatchCommandErrorToWorker(fromWorker, uids, errors.NotImplemented);
-        }
-    }
-}
-
-function _handlePrimaryCommandResultMessage(
-    fromWorkerId: number,
-    logger: any,
-    message: RPCCommandResultMessage
-): void {
-    const { uids, payload } = message;
-    const commandResults = uidsToCommandResults[uids];
-    if (!commandResults) {
-        logger.warn('received command response message from worker for command not in flight', {
-            workerId: fromWorkerId,
-            uids,
-        });
-        return undefined;
-    }
-    if (commandResults[fromWorkerId] === undefined) {
-        logger.warn('received command response message with unexpected worker ID', {
-            workerId: fromWorkerId,
-            uids,
-        });
-        return undefined;
-    }
-    if (commandResults[fromWorkerId] !== null) {
-        logger.warn('ignoring duplicate command response from worker', {
-            workerId: fromWorkerId,
-            uids,
-        });
-        return undefined;
-    }
-    commandResults[fromWorkerId] = payload;
-    const commandResultsArray = Object.values(commandResults);
-    if (commandResultsArray.every(response => response !== null)) {
-        logger.debug('all workers responded to command', { uids });
-        const completeCommandResultsArray = <MarshalledResultObject[]> commandResultsArray;
-        const toWorkerId = uidsToWorkerId[uids];
-        const toWorker = cluster.workers?.[toWorkerId];
-
-        delete uidsToCommandResults[uids];
-        delete uidsToWorkerId[uids];
-
-        if (!toWorker) {
-            logger.warn('worker shut down while its command was executing', {
-                workerId: toWorkerId, uids,
-            });
-            return undefined;
-        }
-        // send back response to original worker
-        _dispatchCommandResultsToWorker(toWorker, uids, completeCommandResultsArray);
-    }
-}
-
-function _handlePrimaryMessage(
-    fromWorker: Worker,
-    message: RPCCommandMessage | RPCCommandResultMessage,
-    handlers?: PrimaryHandlersMap
-): void {
-    const { type: messageType, uids } = message;
-    const logger = rpcLogger.newRequestLoggerFromSerializedUids(uids);
-    logger.debug('primary received message from worker', {
-        workerId: fromWorker?.id, rpcMessage: message,
-    });
-    if (messageType === 'cluster-rpc:command') {
-        return _handlePrimaryCommandMessage(fromWorker, logger, message, handlers);
-    }
-    if (messageType === 'cluster-rpc:commandResult') {
-        return _handlePrimaryCommandResultMessage(fromWorker?.id, logger, message);
-    }
-    logger.error('unsupported message type', {
-        workerId: fromWorker?.id, messageType, uids,
-    });
-    return undefined;
-}
-
-function _sendWorkerCommandResult(
-    uids: string,
-    error: Error | null | undefined,
-    result?: any
-): void {
-    const message: RPCCommandResultMessage = {
-        type: 'cluster-rpc:commandResult',
-        uids,
-        payload: {
-            error: error ? error.message : null,
-            result,
-        },
-    };
-    process.send?.(message);
-}
-
-function _handleWorkerCommandMessage(
-    logger: any,
-    message: RPCCommandMessage,
-    handlers: HandlersMap
-): void {
-    const { toHandler, uids, payload } = message;
-    const cb: HandlerCallback = (err, result) => _sendWorkerCommandResult(uids, err, result);
-
-    if (toHandler in handlers) {
-        return handlers[toHandler](payload, uids, cb);
-    }
-    logger.error('no such handler in "toHandler" field from worker command message', {
-        toHandler,
-    });
-    return cb(errors.NotImplemented);
-}
-
-function _handleWorkerCommandResultsMessage(
-    logger: any,
-    message: RPCCommandResultsMessage,
-): void {
-    const { uids, payload } = message;
-    const { results } = payload;
-    const commandPromise: CommandPromise = uidsToCommandPromise[uids];
-    if (commandPromise === undefined) {
-        logger.error('missing promise for command results', { uids, payload });
-        return undefined;
-    }
-    if (commandPromise.timeout) {
-        clearTimeout(commandPromise.timeout);
-    }
-    delete uidsToCommandPromise[uids];
-    const unmarshalledResults = results.map(workerResult => {
-        let workerError: Error | null = null;
-        if (workerResult.error) {
-            if (workerResult.error in errors) {
-                workerError = errors[workerResult.error];
-            } else {
-                workerError = new Error(workerResult.error);
-            }
-        }
-        if (workerError && workerResult.errorCode) {
-            (workerError as Error & { code: number }).code = workerResult.errorCode;
-        }
-        const unmarshalledResult: ResultObject = {
-            error: workerError,
-            result: workerResult.result,
-        };
-        return unmarshalledResult;
-    });
-    return commandPromise.resolve(unmarshalledResults);
-}
-
-function _handleWorkerCommandErrorMessage(
-    logger: any,
-    message: RPCCommandErrorMessage,
-): void {
-    const { uids, payload } = message;
-    const { error } = payload;
-    const commandPromise: CommandPromise = uidsToCommandPromise[uids];
-    if (commandPromise === undefined) {
-        logger.error('missing promise for command results', { uids, payload });
-        return undefined;
-    }
-    if (commandPromise.timeout) {
-        clearTimeout(commandPromise.timeout);
-    }
-    delete uidsToCommandPromise[uids];
-    let commandError: Error | null = null;
-    if (error in errors) {
-        commandError = errors[error];
-    } else {
-        commandError = new Error(error);
-    }
-    return commandPromise.reject(<Error> commandError);
-}
-
-function _handleWorkerMessage(
-    message: RPCCommandMessage | RPCCommandResultsMessage | RPCCommandErrorMessage,
-    handlers: HandlersMap
-): void {
-    const { type: messageType, uids } = message;
-    const workerId = cluster.worker?.id;
-    const logger = rpcLogger.newRequestLoggerFromSerializedUids(uids);
-    logger.debug('worker received message from primary', {
-        workerId, rpcMessage: message,
-    });
-    if (messageType === 'cluster-rpc:command') {
-        return _handleWorkerCommandMessage(logger, message, handlers);
-    }
-    if (messageType === 'cluster-rpc:commandResults') {
-        return _handleWorkerCommandResultsMessage(logger, message);
-    }
-    if (messageType === 'cluster-rpc:commandError') {
-        return _handleWorkerCommandErrorMessage(logger, message);
-    }
-    logger.error('unsupported message type', {
-        workerId, messageType,
-    });
-    return undefined;
-}
--- a/lib/constants.ts
+++ b/lib/constants.ts
@ -171,7 +171,3 @@ export const maxCachedBuckets = process.env.METADATA_MAX_CACHED_BUCKETS ?
    Number(process.env.METADATA_MAX_CACHED_BUCKETS) : 1000;

 export const validRestoreObjectTiers = new Set(['Expedited', 'Standard', 'Bulk']);
-export const maxBatchingConcurrentOperations = 5;
-
-/** For policy resource arn check we allow empty account ID to not break compatibility */
-export const policyArnAllowedEmptyAccountId = ['utapi', 'scuba'];
--- a/lib/db.ts
+++ b/lib/db.ts
@ -148,7 +148,7 @@ export class IndexTransaction {
                'missing condition for conditional put'
            );
        }
-        if (typeof condition.notExists !== 'string' && typeof condition.exists !== 'string') {
+        if (typeof condition.notExists !== 'string') {
            throw propError(
                'unsupportedConditionalOperation',
                'missing key or supported condition'
--- a/lib/errors/arsenalErrors.ts
+++ b/lib/errors/arsenalErrors.ts
@ -690,11 +690,6 @@ export const ReportNotPresent: ErrorFormat = {
        'The request was rejected because the credential report does not exist. To generate a credential report, use GenerateCredentialReport.',
 };

-export const Found: ErrorFormat = {
-    code: 302,
-    description: 'Resource Found'
-};
-
 // ------------- Special non-AWS S3 errors -------------

 export const MPUinProgress: ErrorFormat = {
@ -1042,15 +1037,3 @@ export const AuthMethodNotImplemented: ErrorFormat = {
    description: 'AuthMethodNotImplemented',
    code: 501,
 };
-
-// --------------------- quotaErros ---------------------
-
-export const NoSuchQuota: ErrorFormat = {
-    code: 404,
-    description: 'The specified resource does not have a quota.',
-};
-
-export const QuotaExceeded: ErrorFormat = {
-    code: 429,
-    description: 'The quota set for the resource is exceeded.',
-};
--- a/lib/models/BackendInfo.ts
+++ b/lib/models/BackendInfo.ts
@ -1,5 +1,3 @@
-import { RequestLogger } from 'werelogs';
-
 import { legacyLocations } from '../constants';
 import escapeForXml from '../s3middleware/escapeForXml';

--- a/lib/models/BucketInfo.ts
+++ b/lib/models/BucketInfo.ts
@ -101,7 +101,6 @@ export default class BucketInfo {
    _azureInfo: any | null;
    _ingestion: { status: 'enabled' | 'disabled' } | null;
    _capabilities?: Capabilities;
-    _quotaMax: number | 0;

    /**
    * Represents all bucket information.
@ -158,7 +157,6 @@ export default class BucketInfo {
    * @param [notificationConfiguration] - bucket notification configuration
    * @param [tags] - bucket tag set
    * @param [capabilities] - capabilities for the bucket
-    * @param quotaMax - bucket quota
    */
    constructor(
        name: string,
@ -187,7 +185,6 @@ export default class BucketInfo {
        notificationConfiguration?: any,
        tags?: Array<BucketTag> | [],
        capabilities?: Capabilities,
-        quotaMax?: number | 0,
    ) {
        assert.strictEqual(typeof name, 'string');
        assert.strictEqual(typeof owner, 'string');
@ -288,10 +285,6 @@ export default class BucketInfo {
            tags = [] as BucketTag[];
        }
        assert.strictEqual(areTagsValid(tags), true);
-        if (quotaMax) {
-            assert.strictEqual(typeof quotaMax, 'number');
-            assert(quotaMax >= 0, 'Quota cannot be negative');
-        }

        // IF UPDATING PROPERTIES, INCREMENT MODELVERSION NUMBER ABOVE
        this._acl = aclInstance;
@ -320,7 +313,6 @@ export default class BucketInfo {
        this._notificationConfiguration = notificationConfiguration || null;
        this._tags = tags;
        this._capabilities = capabilities || undefined;
-        this._quotaMax = quotaMax || 0;
        return this;
    }

@ -356,7 +348,6 @@ export default class BucketInfo {
            notificationConfiguration: this._notificationConfiguration,
            tags: this._tags,
            capabilities: this._capabilities,
-            quotaMax: this._quotaMax,
        };
        const final = this._websiteConfiguration
            ? {
@ -383,7 +374,7 @@ export default class BucketInfo {
            obj.bucketPolicy, obj.uid, obj.readLocationConstraint, obj.isNFS,
            obj.ingestion, obj.azureInfo, obj.objectLockEnabled,
            obj.objectLockConfiguration, obj.notificationConfiguration, obj.tags,
-            obj.capabilities, obj.quotaMax);
+            obj.capabilities);
    }

    /**
@ -410,8 +401,7 @@ export default class BucketInfo {
            data._bucketPolicy, data._uid, data._readLocationConstraint,
            data._isNFS, data._ingestion, data._azureInfo,
            data._objectLockEnabled, data._objectLockConfiguration,
-            data._notificationConfiguration, data._tags, data._capabilities,
-            data._quotaMax);
+            data._notificationConfiguration, data._tags, data._capabilities);
    }

    /**
@ -949,22 +939,4 @@ export default class BucketInfo {
        this._capabilities = capabilities;
        return this;
    }
-
-    /**
-     * Get the bucket quota information
-     * @return quotaMax
-     */
-    getQuota() {
-        return this._quotaMax;
-    }
-    
-    /**
-     * Set bucket quota
-     * @param quota - quota to be set
-     * @return - bucket quota info
-     */
-    setQuota(quota: number) {
-        this._quotaMax = quota || 0;
-        return this;
-    }
 }
--- a/lib/models/LifecycleConfiguration.ts
+++ b/lib/models/LifecycleConfiguration.ts
@ -666,38 +666,13 @@ export default class LifecycleConfiguration {
     * @return Returns an error object or `null`
     */
    _checkDate(date: string) {
-        const isoRegex = new RegExp(
-            "^(-?(?:[1-9][0-9]*)?[0-9]{4})" + // Year
-            "-(1[0-2]|0[1-9])" + // Month
-            "-(3[01]|0[1-9]|[12][0-9])" + // Day
-            "T(2[0-3]|[01][0-9])" + // Hour
-            ":([0-5][0-9])" + // Minute
-            ":([0-5][0-9])" + // Second
-            "(\\.[0-9]+)?" + // Fractional second
-            "(Z|[+-][01][0-9]:[0-5][0-9])?$", // Timezone
-            "g"
-        );
-        const matches = [...date.matchAll(isoRegex)];
-        if (matches.length !== 1) {
+        const isoRegex = new RegExp('^(-?(?:[1-9][0-9]*)?[0-9]{4})-' +
+            '(1[0-2]|0[1-9])-(3[01]|0[1-9]|[12][0-9])T(2[0-3]|[01][0-9])' +
+            ':([0-5][0-9]):([0-5][0-9])(.[0-9]+)?(Z)?$');
+        if (!isoRegex.test(date)) {
            const msg = 'Date must be in ISO 8601 format';
            return errors.InvalidArgument.customizeDescription(msg);
        }
-        // Check for a timezone in the last match group. If none, add a Z to indicate UTC.
-        if (!matches[0][matches[0].length-1]) {
-            date += 'Z';
-        }
-        const dateObj = new Date(date);
-        if (Number.isNaN(dateObj.getTime())) {
-            const msg = 'Date is not a valid date';
-            return errors.InvalidArgument.customizeDescription(msg);
-        }
-        if (dateObj.getUTCHours() !== 0
-            || dateObj.getUTCMinutes() !== 0
-            || dateObj.getUTCSeconds() !== 0
-            || dateObj.getUTCMilliseconds() !== 0) {
-            const msg = '\'Date\' must be at midnight GMT';
-            return errors.InvalidArgument.customizeDescription(msg);
-        }
        return null;
    }

@ -1241,7 +1216,7 @@ export default class LifecycleConfiguration {
                        `</DaysAfterInitiation></${actionName}>`;
                } else if (actionName === 'NoncurrentVersionExpiration') {
                    const Days = `<NoncurrentDays>${days}</NoncurrentDays>`;
-                    const NewerVersions = newerNoncurrentVersions ?
+                    const NewerVersions = newerNoncurrentVersions ? 
                        `<NewerNoncurrentVersions>${newerNoncurrentVersions}</NewerNoncurrentVersions>` : '';
                    Action = `<${actionName}>${Days}${NewerVersions}</${actionName}>`;
                } else if (actionName === 'Expiration') {
--- a/lib/models/ObjectMD.ts
+++ b/lib/models/ObjectMD.ts
@ -58,7 +58,6 @@ export type ObjectMDData = {
    'x-amz-server-side-encryption-customer-algorithm': string;
    'x-amz-website-redirect-location': string;
    'x-amz-scal-transition-in-progress'?: boolean;
-    'x-amz-scal-transition-time'?: string;
    azureInfo?: any;
    acl: ACL;
    key: string;
@ -650,24 +649,10 @@ export default class ObjectMD {
     * Set metadata transition in progress value
     *
     * @param inProgress - True if transition is in progress, false otherwise
-     * @param transitionTime - Date when the transition started
     * @return itself
     */
-    setTransitionInProgress(inProgress: false): this
-    setTransitionInProgress(inProgress: true, transitionTime: Date|string|number): this
-    setTransitionInProgress(inProgress: boolean, transitionTime?: Date|string|number) {
+    setTransitionInProgress(inProgress: boolean) {
        this._data['x-amz-scal-transition-in-progress'] = inProgress;
-        if (!inProgress || !transitionTime) {
-            delete this._data['x-amz-scal-transition-time'];
-        } else {
-            if (typeof transitionTime === 'number') {
-                transitionTime = new Date(transitionTime);
-            }
-            if (transitionTime instanceof Date) {
-                transitionTime = transitionTime.toISOString();
-            }
-            this._data['x-amz-scal-transition-time'] = transitionTime;
-        }
        return this;
    }

@ -680,14 +665,6 @@ export default class ObjectMD {
        return this._data['x-amz-scal-transition-in-progress'];
    }

-    /**
-     * Gets the transition time of the object.
-     * @returns The transition time of the object.
-     */
-    getTransitionTime() {
-        return this._data['x-amz-scal-transition-time'];
-    }
-
    /**
     * Set access control list
     *
--- a/lib/models/ReplicationConfiguration.ts
+++ b/lib/models/ReplicationConfiguration.ts
@ -1,8 +1,6 @@
 import assert from 'assert';
 import UUID from 'uuid';

-import { RequestLogger } from 'werelogs';
-
 import escapeForXml from '../s3middleware/escapeForXml';
 import errors from '../errors';
 import { isValidBucketName } from '../s3routes/routesUtils';
--- a/lib/network/http/server.ts
+++ b/lib/network/http/server.ts
@ -435,6 +435,7 @@ export default class Server {
            this._server.on('connection', sock => {
                // Setting no delay of the socket to the value configured
                // TODO fix this
+                // @ts-expect-errors
                sock.setNoDelay(this.isNoDelay());
                sock.on('error', err => this._logger.info(
                    'socket error - request rejected', { error: err }));
--- a/lib/network/probe/HealthProbeServer.ts
+++ b/lib/network/probe/HealthProbeServer.ts
@ -62,7 +62,7 @@ export default class HealthProbeServer extends httpServer {
    _onLiveness(
        _req: http.IncomingMessage,
        res: http.ServerResponse,
-        log: werelogs.RequestLogger,
+        log: RequestLogger,
    ) {
        if (this._livenessCheck(log)) {
            sendSuccess(res, log);
@ -74,7 +74,7 @@ export default class HealthProbeServer extends httpServer {
    _onReadiness(
        _req: http.IncomingMessage,
        res: http.ServerResponse,
-        log: werelogs.RequestLogger,
+        log: RequestLogger,
    ) {
        if (this._readinessCheck(log)) {
            sendSuccess(res, log);
--- a/lib/network/probe/ProbeServer.ts
+++ b/lib/network/probe/ProbeServer.ts
@ -16,7 +16,7 @@ export const DEFAULT_METRICS_ROUTE = '/metrics';
 * @param log - Werelogs instance for logging if you choose to
 */

-export type ProbeDelegate = (res: http.ServerResponse, log: werelogs.RequestLogger) => string | void
+export type ProbeDelegate = (res: http.ServerResponse, log: RequestLogger) => string | void

 export type ProbeServerParams = {
    port: number;
--- a/lib/network/probe/Utils.ts
+++ b/lib/network/probe/Utils.ts
@ -1,7 +1,4 @@
 import * as http from 'http';
-
-import { RequestLogger } from 'werelogs';
-
 import { ArsenalError } from '../../errors';

 /**
--- a/lib/network/rest/RESTClient.ts
+++ b/lib/network/rest/RESTClient.ts
@ -119,7 +119,7 @@ export default class RESTClient {
        method: string,
        headers: http.OutgoingHttpHeaders | null,
        key: string | null,
-        log: werelogs.RequestLogger,
+        log: RequestLogger,
        responseCb: (res: http.IncomingMessage) => void,
    ) {
        const reqHeaders = headers || {};
--- a/lib/network/rest/RESTServer.ts
+++ b/lib/network/rest/RESTServer.ts
@ -25,7 +25,7 @@ function setContentRange(

 function sendError(
    res: http.ServerResponse,
-    log: werelogs.RequestLogger,
+    log: RequestLogger,
    error: ArsenalError,
    optMessage?: string,
 ) {
@ -141,7 +141,7 @@ export default class RESTServer extends httpServer {
    _onPut(
        req: http.IncomingMessage,
        res: http.ServerResponse,
-        log: werelogs.RequestLogger,
+        log: RequestLogger,
    ) {
        let size: number;
        try {
@ -183,7 +183,7 @@ export default class RESTServer extends httpServer {
    _onGet(
        req: http.IncomingMessage,
        res: http.ServerResponse,
-        log: werelogs.RequestLogger,
+        log: RequestLogger,
    ) {
        let pathInfo: ReturnType<typeof parseURL>;
        let rangeSpec: ReturnType<typeof httpUtils.parseRangeSpec> | undefined =
@ -266,7 +266,7 @@ export default class RESTServer extends httpServer {
    _onDelete(
        req: http.IncomingMessage,
        res: http.ServerResponse,
-        log: werelogs.RequestLogger,
+        log: RequestLogger,
    ) {
        let pathInfo: ReturnType<typeof parseURL>;
        try {
--- a/lib/network/rpc/rpc.ts
+++ b/lib/network/rpc/rpc.ts
@ -497,7 +497,7 @@ export function RPCServer(params: {
    assert(params.logger);

    const httpServer = http.createServer();
-    const server = new IOServer(httpServer, { maxHttpBufferSize: 1e8 });
+    const server = new IOServer(httpServer);
    const log = params.logger;

    /**
--- a/lib/policy/resourcePolicySchema.json
+++ b/lib/policy/resourcePolicySchema.json
@ -38,7 +38,7 @@
        },
        "principalAWSUserArn": {
            "type": "string",
-            "pattern": "^arn:aws:iam::[0-9]{12}:user/(?!\\*)[\\w+=,.@ -/]{1,2017}$"
+            "pattern": "^arn:aws:iam::[0-9]{12}:user/(?!\\*)[\\w+=,.@ -/]{1,64}$"
        },
        "principalAWSRoleArn": {
            "type": "string",
@ -360,9 +360,6 @@
            "type": "string",
            "const": "2012-10-17"
        },
-        "Id": {
-            "type": "string"
-        },
        "Statement": {
            "oneOf": [
                {
--- a/lib/policy/userPolicySchema.json
+++ b/lib/policy/userPolicySchema.json
@ -28,7 +28,7 @@
        },
        "principalAWSUserArn": {
            "type": "string",
-            "pattern": "^arn:aws:iam::[0-9]{12}:user/(?!\\*)[\\w+=,.@ -/]{1,2017}$"
+            "pattern": "^arn:aws:iam::[0-9]{12}:user/(?!\\*)[\\w+=,.@ -/]{1,64}$"
        },
        "principalAWSRoleArn": {
            "type": "string",
--- a/lib/policyEvaluator/RequestContext.ts
+++ b/lib/policyEvaluator/RequestContext.ts
@ -12,39 +12,13 @@ import {
    actionMapSSO,
    actionMapSTS,
    actionMapMetadata,
-    actionMapScuba,
 } from './utils/actionMaps';

-export const actionNeedQuotaCheck = {
+const _actionNeedQuotaCheck = {
    objectPut: true,
-    objectPutVersion: true,
    objectPutPart: true,
-    objectRestore: true,
 };

-/**
- * This variable describes APIs that change the bytes
- * stored, requiring quota updates
- */
-export const actionWithDataDeletion = {
-    objectDelete: true,
-    objectDeleteVersion: true,
-    multipartDelete: true,
-    multiObjectDelete: true,
-};
-
-/**
- * The function returns true if the current API call is a copy object
- * and the action requires a quota evaluation logic, post retrieval
- * of the object metadata.
- * @param {string} action - the action being performed
- * @param {string} currentApi - the current API being called
- * @return {boolean} - whether the action requires a quota check
- */
-export function actionNeedQuotaCheckCopy(action: string, currentApi: string) {
-    return action === 'objectGet' && (currentApi === 'objectCopy' || currentApi === 'objectPutCopyPart');
-}
-
 function _findAction(service: string, method: string) {
    switch (service) {
        case 's3':
@ -62,8 +36,6 @@ function _findAction(service: string, method: string) {
            return actionMapSTS[method];
        case 'metadata':
            return actionMapMetadata[method];
-        case 'scuba':
-            return actionMapScuba[method];
        default:
            return undefined;
    }
@ -133,10 +105,6 @@ function _buildArn(
            return `arn:scality:metadata::${requesterInfo!.accountid}:` +
            `${generalResource}/`;
        }
-        case 'scuba': {
-            return `arn:scality:scuba::${requesterInfo!.accountid}:` +
-            `${generalResource}${specificResource ? '/' + specificResource : ''}`;
-        }
        default:
            return undefined;
    }
@ -205,7 +173,6 @@ export default class RequestContext {
    _needTagEval: boolean;
    _foundAction?: string;
    _foundResource?: string;
-    _objectLockRetentionDays?: number | null;

    constructor(
        headers: { [key: string]: string | string[] },
@ -227,7 +194,6 @@ export default class RequestContext {
        requestObjTags?: string,
        existingObjTag?: string,
        needTagEval?: false,
-        objectLockRetentionDays?: number,
    ) {
        this._headers = headers;
        this._query = query;
@ -256,12 +222,10 @@ export default class RequestContext {
        this._securityToken = securityToken;
        this._policyArn = policyArn;
        this._action = action;
-        this._needQuota = actionNeedQuotaCheck[apiMethod] === true
-            || actionWithDataDeletion[apiMethod] === true;
+        this._needQuota = _actionNeedQuotaCheck[apiMethod] === true;
        this._requestObjTags = requestObjTags || null;
        this._existingObjTag = existingObjTag || null;
        this._needTagEval = needTagEval || false;
-        this._objectLockRetentionDays = objectLockRetentionDays || null;
        return this;
    }

@ -293,7 +257,6 @@ export default class RequestContext {
            requestObjTags: this._requestObjTags,
            existingObjTag: this._existingObjTag,
            needTagEval: this._needTagEval,
-            objectLockRetentionDays: this._objectLockRetentionDays,
        };
        return JSON.stringify(requestInfo);
    }
@ -334,7 +297,6 @@ export default class RequestContext {
            obj.requestObjTags,
            obj.existingObjTag,
            obj.needTagEval,
-            obj.objectLockRetentionDays,
        );
    }

@ -738,24 +700,4 @@ export default class RequestContext {
    getNeedTagEval() {
        return this._needTagEval;
    }
-
-    /**
-     * Get object lock retention days
-     *
-     * @returns objectLockRetentionDays - object lock retention days 
-     */
-    getObjectLockRetentionDays() {
-        return this._objectLockRetentionDays;
-    }
-
-    /**
-     * Set object lock retention days
-     *
-     * @param objectLockRetentionDays - object lock retention days
-     * @returns itself
-     */
-    setObjectLockRetentionDays(objectLockRetentionDays: number) {
-        this._objectLockRetentionDays = objectLockRetentionDays;
-        return this;
-    }
 }
--- a/lib/policyEvaluator/evaluator.ts
+++ b/lib/policyEvaluator/evaluator.ts
@ -310,7 +310,6 @@ export function evaluatePolicy(
 }

 /**
- * @deprecated Upgrade to standardEvaluateAllPolicies
 * Evaluate whether a request is permitted under a policy.
 * @param requestContext - Info necessary to
 * evaluate permission
@ -326,16 +325,6 @@ export function evaluateAllPolicies(
    allPolicies: any[],
    log: Logger,
 ): string {
-    return standardEvaluateAllPolicies(requestContext, allPolicies, log).verdict;
-}
-export function standardEvaluateAllPolicies(
-    requestContext: RequestContext,
-    allPolicies: any[],
-    log: Logger,
-): {
-    verdict: string;
-    isImplicit: boolean;
-} {
    log.trace('evaluating all policies');
    let allow = false;
    let allowWithTagCondition = false;
@ -344,10 +333,7 @@ export function standardEvaluateAllPolicies(
        const singlePolicyVerdict = evaluatePolicy(requestContext, allPolicies[i], log);
        // If there is any Deny, just return Deny
        if (singlePolicyVerdict === 'Deny') {
-            return {
-                verdict: 'Deny',
-                isImplicit: false,
-            };
+            return 'Deny';
        }
        if (singlePolicyVerdict === 'Allow') {
            allow = true;
@ -358,7 +344,6 @@ export function standardEvaluateAllPolicies(
        } // else 'Neutral'
    }
    let verdict;
-    let isImplicit = false;
    if (allow) {
        if (denyWithTagCondition) {
            verdict = 'NeedTagConditionEval';
@ -370,9 +355,8 @@ export function standardEvaluateAllPolicies(
            verdict = 'NeedTagConditionEval';
        } else {
            verdict = 'Deny';
-            isImplicit = true;
        }
    }
-    log.trace('result of evaluating all policies', { verdict, isImplicit });
-    return { verdict, isImplicit };
+    log.trace('result of evaluating all policies', { verdict });
+    return verdict;
 }
--- a/lib/policyEvaluator/utils/actionMaps.ts
+++ b/lib/policyEvaluator/utils/actionMaps.ts
@ -52,12 +52,6 @@ const sharedActionMap = {
    objectPutVersion: 's3:PutObjectVersion',
 };

-const actionMapBucketQuotas = {
-    bucketGetQuota: 'scality:GetBucketQuota',
-    bucketUpdateQuota: 'scality:UpdateBucketQuota',
-    bucketDeleteQuota: 'scality:DeleteBucketQuota',
-};
-
 // action map used for request context
 const actionMapRQ = {
    bucketPut: 's3:CreateBucket',
@ -71,7 +65,6 @@ const actionMapRQ = {
    initiateMultipartUpload: 's3:PutObject',
    objectDeleteVersion: 's3:DeleteObjectVersion',
    objectDeleteTaggingVersion: 's3:DeleteObjectVersionTagging',
-    objectGetArchiveInfo: 'scality:GetObjectArchiveInfo',
    objectGetVersion: 's3:GetObjectVersion',
    objectGetACLVersion: 's3:GetObjectVersionAcl',
    objectGetTaggingVersion: 's3:GetObjectVersionTagging',
@ -86,11 +79,10 @@ const actionMapRQ = {
    objectPutLegalHoldVersion: 's3:PutObjectLegalHold',
    listObjectVersions: 's3:ListBucketVersions',
    ...sharedActionMap,
-    ...actionMapBucketQuotas,
 };

 // action map used for bucket policies
-const actionMapBP = actionMapRQ;
+const actionMapBP = { ...sharedActionMap };

 // action map for all relevant s3 actions
 const actionMapS3 = {
@ -159,15 +151,6 @@ const actionMonitoringMapS3 = {
    objectPutTagging: 'PutObjectTagging',
    objectRestore: 'RestoreObject',
    serviceGet: 'ListBuckets',
-    bucketGetQuota: 'GetBucketQuota',
-    bucketUpdateQuota: 'UpdateBucketQuota',
-    bucketDeleteQuota: 'DeleteBucketQuota', 
-};
-
-const actionMapAccountQuotas = {
-    UpdateAccountQuota : 'scality:UpdateAccountQuota',
-    DeleteAccountQuota : 'scality:DeleteAccountQuota',
-    GetAccountQuota : 'scality:GetAccountQuota',
 };

 const actionMapIAM = {
@ -211,7 +194,6 @@ const actionMapIAM = {
    tagUser: 'iam:TagUser',
    unTagUser: 'iam:UntagUser',
    listUserTags: 'iam:ListUserTags',
-    ...actionMapAccountQuotas,
 };

 const actionMapSSO = {
@ -227,14 +209,6 @@ const actionMapMetadata = {
    default: 'metadata:bucketd',
 };

-const actionMapScuba = {
-    GetMetrics: 'scuba:GetMetrics',
-    AdminStartIngest: 'scuba:AdminStartIngest',
-    AdminStopIngest: 'scuba:AdminStopIngest',
-    AdminReadRaftCseq: 'scuba:AdminReadRaftCseq',
-    AdminTriggerRepair: 'scuba:AdminTriggerRepair',
-};
-
 export {
    actionMapRQ,
    actionMapBP,
@ -244,5 +218,4 @@ export {
    actionMapSSO,
    actionMapSTS,
    actionMapMetadata,
-    actionMapScuba,
 };
--- a/lib/policyEvaluator/utils/checkArnMatch.ts
+++ b/lib/policyEvaluator/utils/checkArnMatch.ts
@ -1,5 +1,5 @@
 import { handleWildcardInResource } from './wildcards';
-import { policyArnAllowedEmptyAccountId } from '../../constants';
+
 /**
 * Checks whether an ARN from a request matches an ARN in a policy
 * to compare against each portion of the ARN from the request
@ -38,10 +38,9 @@ export default function checkArnMatch(
        const requestSegment = caseSensitive ? requestArnArr[j] :
            requestArnArr[j].toLowerCase();
        const policyArnArr = policyArn.split(':');
-        // We want to allow an empty account ID for utapi and scuba service ARNs to not
+        // We want to allow an empty account ID for utapi service ARNs to not
        // break compatibility.
-        if (j === 4 && policyArnAllowedEmptyAccountId.includes(policyArnArr[2])
-            && policyArnArr[4] === '') {
+        if (j === 4 && policyArnArr[2] === 'utapi' && policyArnArr[4] === '') {
            continue;
        } else if (!segmentRegEx.test(requestSegment)) {
            return false;
--- a/lib/policyEvaluator/utils/conditions.ts
+++ b/lib/policyEvaluator/utils/conditions.ts
@ -168,9 +168,6 @@ export function findConditionKey(
        return requestContext.getNeedTagEval() && requestContext.getRequestObjTags()
            ? getTagKeys(requestContext.getRequestObjTags()!)
            : undefined;
-    // The maximum retention period is 100 years.
-    case 's3:object-lock-remaining-retention-days':
-        return requestContext.getObjectLockRetentionDays() || undefined;
    default:
        return undefined;
    }
--- a/lib/s3middleware/azureHelpers/mpuUtils.ts
+++ b/lib/s3middleware/azureHelpers/mpuUtils.ts
@ -2,9 +2,6 @@ import assert from 'assert';
 import * as crypto from 'crypto';
 import * as stream from 'stream';
 import azure from '@azure/storage-blob';
-
-import { RequestLogger } from 'werelogs';
-
 import ResultsCollector from './ResultsCollector';
 import SubStreamInterface from './SubStreamInterface';
 import * as objectUtils from '../objectUtils';
--- a/lib/s3middleware/lifecycleHelpers/LifecycleDateTime.ts
+++ b/lib/s3middleware/lifecycleHelpers/LifecycleDateTime.ts
@ -1,25 +1,19 @@
-import { scaleMsPerDay } from '../objectUtils';
-const msInOneDay = 24 * 60 * 60 * 1000; // Milliseconds in a day.
+const oneDay = 24 * 60 * 60 * 1000; // Milliseconds in a day.

 export default class LifecycleDateTime {
    _transitionOneDayEarlier?: boolean;
    _expireOneDayEarlier?: boolean;
-    _timeProgressionFactor?: number;
-    _scaledMsPerDay: number;

    constructor(params?: {
        transitionOneDayEarlier: boolean;
        expireOneDayEarlier: boolean;
-        timeProgressionFactor: number;
    }) {
        this._transitionOneDayEarlier = params?.transitionOneDayEarlier;
        this._expireOneDayEarlier = params?.expireOneDayEarlier;
-        this._timeProgressionFactor = params?.timeProgressionFactor || 1;
-        this._scaledMsPerDay = scaleMsPerDay(this._timeProgressionFactor);
    }

    getCurrentDate() {
-        const timeTravel = this._expireOneDayEarlier ? msInOneDay : 0;
+        const timeTravel = this._expireOneDayEarlier ? oneDay : 0;
        return Date.now() + timeTravel;
    }

@ -31,7 +25,7 @@ export default class LifecycleDateTime {
    findDaysSince(date: Date) {
        const now = this.getCurrentDate();
        const diff = now - date.getTime();
-        return Math.floor(diff / this._scaledMsPerDay);
+        return Math.floor(diff / (1000 * 60 * 60 * 24));
    }

    /**
@ -58,8 +52,8 @@ export default class LifecycleDateTime {
        }
        if (transition.Days !== undefined) {
            const lastModifiedTime = this.getTimestamp(lastModified);
-            const timeTravel = this._transitionOneDayEarlier ? -msInOneDay : 0;
-            return lastModifiedTime + (transition.Days * this._scaledMsPerDay) + timeTravel;
+            const timeTravel = this._transitionOneDayEarlier ? -oneDay : 0;
+            return lastModifiedTime + (transition.Days * oneDay) + timeTravel;
        }
    }

@ -75,8 +69,8 @@ export default class LifecycleDateTime {
    ) {
        if (transition.NoncurrentDays !== undefined) {
            const lastModifiedTime = this.getTimestamp(lastModified);
-            const timeTravel = this._transitionOneDayEarlier ? -msInOneDay : 0;
-            return lastModifiedTime + (transition.NoncurrentDays * this._scaledMsPerDay) + timeTravel;
+            const timeTravel = this._transitionOneDayEarlier ? -oneDay : 0;
+            return lastModifiedTime + (transition.NoncurrentDays * oneDay) + timeTravel;
        }
    }
 }
--- a/lib/s3middleware/objectUtils.ts
+++ b/lib/s3middleware/objectUtils.ts
@ -1,5 +1,3 @@
-const msInOneDay = 24 * 60 * 60 * 1000; // Milliseconds in a day.
-
 export const getMD5Buffer = (base64MD5: WithImplicitCoercion<string> | Uint8Array) =>
    base64MD5 instanceof Uint8Array ? base64MD5 : Buffer.from(base64MD5, 'base64')

@ -8,14 +6,3 @@ export const getHexMD5 = (base64MD5: WithImplicitCoercion<string> | Uint8Array)

 export const getBase64MD5 = (hexMD5: WithImplicitCoercion<string>) =>
    Buffer.from(hexMD5, 'hex').toString('base64');
-
-
-/**
- * Calculates the number of scaled milliseconds per day based on the given time progression factor.
- * This function is intended for testing and simulation purposes only.
- * @param {number} timeProgressionFactor - The desired time progression factor for scaling.
- * @returns {number} The number of scaled milliseconds per day.
- * If the result is 0, the minimum value of 1 millisecond is returned.
- */
-export const scaleMsPerDay = (timeProgressionFactor: number): number =>
-    Math.round(msInOneDay / (timeProgressionFactor || 1)) || 1;
--- a/lib/s3routes/routes.ts
+++ b/lib/s3routes/routes.ts
@ -1,7 +1,4 @@
 import assert from 'assert';
-
-import { RequestLogger } from 'werelogs';
-
 import errors from '../errors';
 import routeGET from './routes/routeGET';
 import routePUT from './routes/routePUT';
--- a/lib/s3routes/routes/routeDELETE.ts
+++ b/lib/s3routes/routes/routeDELETE.ts
@ -1,5 +1,3 @@
-import { RequestLogger } from 'werelogs';
-
 import * as routesUtils from '../routesUtils';
 import errors from '../../errors';
 import StatsClient from '../../metrics/StatsClient';
@ -43,8 +41,6 @@ export default function routeDELETE(
            return call('bucketDeleteEncryption');
        } else if (query?.tagging !== undefined) {
            return call('bucketDeleteTagging');
-        } else if (query?.quota !== undefined) {
-            return call('bucketDeleteQuota');
        }
        call('bucketDelete');
    } else {
--- a/lib/s3routes/routes/routeGET.ts
+++ b/lib/s3routes/routes/routeGET.ts
@ -1,5 +1,3 @@
-import { RequestLogger } from 'werelogs';
-
 import * as routesUtils from '../routesUtils';
 import errors from '../../errors';
 import * as http from 'http';
@ -60,8 +58,6 @@ export default function routerGET(
            call('bucketGetEncryption');
        } else if (query.search !== undefined) {
            call('metadataSearch')
-        } else if (query.quota !== undefined) {
-            call('bucketGetQuota');
        } else {
            // GET bucket
            call('bucketGet');
--- a/lib/s3routes/routes/routeHEAD.ts
+++ b/lib/s3routes/routes/routeHEAD.ts
@ -1,5 +1,3 @@
-import { RequestLogger } from 'werelogs';
-
 import * as routesUtils from '../routesUtils';
 import errors from '../../errors';
 import StatsClient from '../../metrics/StatsClient';
--- a/lib/s3routes/routes/routeOPTIONS.ts
+++ b/lib/s3routes/routes/routeOPTIONS.ts
@ -1,5 +1,3 @@
-import { RequestLogger } from 'werelogs';
-
 import * as routesUtils from '../routesUtils';
 import errors from '../../errors';
 import * as http from 'http';
--- a/lib/s3routes/routes/routePOST.ts
+++ b/lib/s3routes/routes/routePOST.ts
@ -1,5 +1,3 @@
-import { RequestLogger } from 'werelogs';
-
 import * as routesUtils from '../routesUtils';
 import errors from '../../errors';
 import * as http from 'http';
--- a/lib/s3routes/routes/routePUT.ts
+++ b/lib/s3routes/routes/routePUT.ts
@ -1,5 +1,3 @@
-import { RequestLogger } from 'werelogs';
-
 import * as routesUtils from '../routesUtils';
 import errors from '../../errors';
 import * as http from 'http';
@ -105,13 +103,6 @@ export default function routePUT(
                    return routesUtils.responseNoBody(err, corsHeaders,
                        response, 200, log);
                });
-        } else if (query.quota !== undefined) {
-            api.callApiMethod('bucketUpdateQuota', request, response,
-                log, (err, resHeaders) => {
-                    routesUtils.statsReport500(err, statsClient);
-                    return routesUtils.responseNoBody(err, resHeaders, response,
-                        200, log);
-                });
        } else {
            // PUT bucket
            return api.callApiMethod('bucketPut', request, response, log,
--- a/lib/s3routes/routes/routeWebsite.ts
+++ b/lib/s3routes/routes/routeWebsite.ts
@ -1,5 +1,3 @@
-import { RequestLogger } from 'werelogs';
-
 import * as routesUtils from '../routesUtils';
 import errors from '../../errors';
 import * as http from 'http';
@ -29,11 +27,6 @@ export default function routerWebsite(
                routesUtils.statsReport500(err, statsClient);
                // request being redirected
                if (redirectInfo) {
-                    if (err && redirectInfo.withError) {
-                        return routesUtils.redirectRequestOnError(err,
-                            'GET', redirectInfo, dataGetInfo, dataRetrievalParams,
-                            response, resMetaHeaders, log)
-                    }
                    // note that key might have been modified in websiteGet
                    // api to add index document
                    return routesUtils.redirectRequest(redirectInfo,
@ -64,11 +57,6 @@ export default function routerWebsite(
            (err, resMetaHeaders, redirectInfo, key) => {
                routesUtils.statsReport500(err, statsClient);
                if (redirectInfo) {
-                    if (err && redirectInfo.withError) {
-                        return routesUtils.redirectRequestOnError(err,
-                            'HEAD', redirectInfo, null, dataRetrievalParams,
-                            response, resMetaHeaders, log)
-                    }
                    return routesUtils.redirectRequest(redirectInfo,
                        // TODO ARSN-217 encrypted does not exists in request.connection
                        // @ts-ignore
--- a/lib/s3routes/routesUtils.ts
+++ b/lib/s3routes/routesUtils.ts
@ -1,13 +1,10 @@
 import * as url from 'url';
-import * as http from 'http';
-import { eachSeries } from 'async';
-
-import { RequestLogger } from 'werelogs';
-
 import * as ipCheck from '../ipCheck';
 import errors, { ArsenalError } from '../errors';
 import * as constants from '../constants';
+import { eachSeries } from 'async';
 import DataWrapper from '../storage/data/DataWrapper';
+import * as http from 'http';
 import StatsClient from '../metrics/StatsClient';
 import { objectKeyByteLimit } from '../constants';
 const jsutil = require('../jsutil');
@ -694,8 +691,6 @@ export function streamUserErrorPage(
    log: RequestLogger,
 ) {
    setCommonResponseHeaders(corsHeaders, response, log);
-    response.setHeader('x-amz-error-code', err.message);
-    response.setHeader('x-amz-error-message', err.description);
    response.writeHead(err.code, { 'Content-type': 'text/html' });
    response.on('finish', () => {
        // TODO ARSN-216 Fix logger
@ -878,7 +873,7 @@ export function redirectRequest(
    }
    let redirectLocation = justPath ? `/${redirectKey}` :
        `${redirectProtocol}://${redirectHostName}/${redirectKey}`;
-    if (!redirectKey && redirectLocationHeader && redirectLocation !== '/') {
+    if (!redirectKey && redirectLocationHeader) {
        // remove hanging slash
        redirectLocation = redirectLocation.slice(0, -1);
    }
@ -895,52 +890,6 @@ export function redirectRequest(
    return undefined;
 }

-/**
- * redirectRequestOnError - redirect with an error body
- * @param err - arsenal error object
- * @param method - HTTP method
- * @param routingInfo - info for routing
- * @param [routingInfo.withError] - flag to differentiate from routing rules
- * @param [routingInfo.location] - location header
- * @param dataLocations --
- *   - array of locations to get streams from backend
- * @param retrieveDataParams - params to create instance of
- * data retrieval function
- * @param response - response object
- * @param corsHeaders - CORS-related response headers
- * @param log - Werelogs instance
- */
-export function redirectRequestOnError(
-    err: ArsenalError,
-    method: 'HEAD' | 'GET',
-    routingInfo: {
-        withError: true;
-        location: string;
-    },
-    dataLocations: { size: string | number }[] | null,
-    retrieveDataParams: any,
-    response: http.ServerResponse,
-    corsHeaders: { [key: string]: string },
-    log: RequestLogger,
-) {
-    response.setHeader('Location', routingInfo.location);
-
-    if (!dataLocations && err.is.Found) {
-        if (method === 'HEAD') {
-            return errorHeaderResponse(err, response, corsHeaders, log);
-        }
-        response.setHeader('x-amz-error-code', err.message);
-        response.setHeader('x-amz-error-message', err.description);
-        return errorHtmlResponse(err, false, '', response, corsHeaders, log);
-    }
-
-    // This is reached only for website error document (GET only)
-    const overrideErrorCode = err.flatten();
-    overrideErrorCode.code = 301;
-    return streamUserErrorPage(ArsenalError.unflatten(overrideErrorCode)!,
-        dataLocations || [], retrieveDataParams, response, corsHeaders, log);
-}
-
 /**
 * Get bucket name and object name from the request
 * @param request - http request object
--- a/lib/storage/data/DataWrapper.js
+++ b/lib/storage/data/DataWrapper.js
@ -2,8 +2,6 @@ const async = require('async');
 const PassThrough = require('stream').PassThrough;
 const assert = require('assert');

-const { Logger } = require('werelogs');
-
 const errors = require('../../errors').default;
 const MD5Sum = require('../../s3middleware/MD5Sum').default;
 const NullStream = require('../../s3middleware/nullStream').default;
@ -29,7 +27,6 @@ class DataWrapper {
        this.metadata = metadata;
        this.locStorageCheckFn = locStorageCheckFn;
        this.vault = vault;
-        this.logger = new Logger('DataWrapper');
    }

    put(cipherBundle, value, valueSize, keyContext, backendInfo, log, cb) {
@ -130,7 +127,7 @@ class DataWrapper {
    }

    delete(objectGetInfo, log, cb) {
-        const callback = cb || (() => {});
+        const callback = cb || log.end;
        const isMdModelVersion2 = typeof(objectGetInfo) === 'string';
        const isRequiredStringKey =
            constants.clientsRequireStringKey[this.implName];
@ -179,9 +176,7 @@ class DataWrapper {
            newObjDataStoreName)) {
            return process.nextTick(cb);
        }
-        const delLog = this.logger.newRequestLoggerFromSerializedUids(
-            log.getSerializedUids());
-        delLog.trace('initiating batch delete', {
+        log.trace('initiating batch delete', {
            keys: locations,
            implName: this.implName,
            method: 'batchDelete',
@ -207,21 +202,21 @@ class DataWrapper {
            return false;
        });
        if (shouldBatchDelete && keys.length > 1) {
-            return this.client.batchDelete(backendName, { keys }, delLog, cb);
+            return this.client.batchDelete(backendName, { keys }, log, cb);
        }
        return async.eachLimit(locations, 5, (loc, next) => {
-            process.nextTick(() => this.delete(loc, delLog, next));
+            process.nextTick(() => this.delete(loc, log, next));
        },
        err => {
            if (err) {
-                delLog.end().error('batch delete failed', { error: err });
+                log.end().error('batch delete failed', { error: err });
                // deletion of non-existing objects result in 204
                if (err.code === 404) {
                    return cb();
                }
                return cb(err);
            }
-            delLog.end().trace('batch delete successfully completed');
+            log.end().trace('batch delete successfully completed');
            return cb();
        });
    }
--- a/lib/storage/data/LocationConstraintParser.js
+++ b/lib/storage/data/LocationConstraintParser.js
@ -1,10 +1,10 @@
 const { http, https } = require('httpagent');
 const url = require('url');
 const AWS = require('aws-sdk');
+const Sproxy = require('sproxydclient');
+const Hyperdrive = require('hdclient');
 const HttpsProxyAgent = require('https-proxy-agent');

-require("aws-sdk/lib/maintenance_mode_message").suppress = true;
-
 const constants = require('../../constants');
 const DataFileBackend = require('./file/DataFileInterface');
 const inMemory = require('./in_memory/datastore').backend;
@ -25,13 +25,8 @@ function parseLC(config, vault) {
        if (locationObj.type === 'file') {
            clients[location] = new DataFileBackend(config);
        }
-        if (locationObj.type === 'vitastor') {
-            const VitastorBackend = require('./vitastor/VitastorBackend');
-            clients[location] = new VitastorBackend(location, locationObj.details);
-        }
        if (locationObj.type === 'scality') {
            if (locationObj.details.connector.sproxyd) {
-                const Sproxy = require('sproxydclient');
                clients[location] = new Sproxy({
                    bootstrap: locationObj.details.connector
                        .sproxyd.bootstrap,
@ -46,7 +41,6 @@ function parseLC(config, vault) {
                });
                clients[location].clientType = 'scality';
            } else if (locationObj.details.connector.hdclient) {
-                const Hyperdrive = require('hdclient');
                clients[location] = new Hyperdrive.hdcontroller.HDProxydClient(
                    locationObj.details.connector.hdclient);
                clients[location].clientType = 'scality';
--- a/lib/storage/data/MultipleBackendGateway.js
+++ b/lib/storage/data/MultipleBackendGateway.js
@ -5,7 +5,6 @@ const { parseTagFromQuery } = require('../../s3middleware/tagging');
 const { externalBackendHealthCheckInterval } = require('../../constants');
 const DataFileBackend = require('./file/DataFileInterface');
 const { createLogger, checkExternalBackend } = require('./external/utils');
-const jsutil = require('../../jsutil');

 class MultipleBackendGateway {
    constructor(clients, metadata, locStorageCheckFn) {
@ -200,12 +199,11 @@ class MultipleBackendGateway {
    uploadPart(request, streamingV4Params, stream, size, location, key,
        uploadId, partNumber, bucketName, log, cb) {
        const client = this.clients[location];
-        const cbOnce = jsutil.once(cb);

        if (client.uploadPart) {
            return this.locStorageCheckFn(location, size, log, err => {
                if (err) {
-                    return cbOnce(err);
+                    return cb(err);
                }
                return client.uploadPart(request, streamingV4Params, stream,
                    size, key, uploadId, partNumber, bucketName, log,
@ -219,14 +217,14 @@ class MultipleBackendGateway {
                                    'metric following object PUT failure',
                                        { error: error.message });
                                    }
-                                    return cbOnce(err);
+                                    return cb(err);
                                });
                        }
-                        return cbOnce(null, partInfo);
+                        return cb(null, partInfo);
                    });
            });
        }
-        return cbOnce();
+        return cb();
    }

    listParts(key, uploadId, location, bucketName, partNumberMarker, maxParts,
--- a/lib/storage/data/external/AwsClient.js
+++ b/lib/storage/data/external/AwsClient.js
@ -8,7 +8,6 @@ const getMetaHeaders =
 const { prepareStream } = require('../../../s3middleware/prepareStream');
 const { createLogger, logHelper, removeQuotes, trimXMetaPrefix } =
    require('./utils');
-const jsutil = require('../../../jsutil');

 const missingVerIdInternalError = errors.InternalError.customizeDescription(
    'Invalid state. Please ensure versioning is enabled ' +
@ -318,11 +317,9 @@ class AwsClient {
    uploadPart(request, streamingV4Params, stream, size, key, uploadId,
        partNumber, bucketName, log, callback) {
        let hashedStream = stream;
-        const cbOnce = jsutil.once(callback);
-
        if (request) {
            const partStream = prepareStream(request, streamingV4Params,
-                this._vault, log, cbOnce);
+                this._vault, log, callback);
            hashedStream = new MD5Sum();
            partStream.pipe(hashedStream);
        }
@ -336,7 +333,7 @@ class AwsClient {
            if (err) {
                logHelper(log, 'error', 'err from data backend ' +
                    'on uploadPart', err, this._dataStoreName, this.clientType);
-                return cbOnce(errors.ServiceUnavailable
+                return callback(errors.ServiceUnavailable
                    .customizeDescription('Error returned from ' +
                    `${this.type}: ${err.message}`),
                );
@ -350,7 +347,7 @@ class AwsClient {
                dataStoreName: this._dataStoreName,
                dataStoreETag: noQuotesETag,
            };
-            return cbOnce(null, dataRetrievalInfo);
+            return callback(null, dataRetrievalInfo);
        });
    }

--- a/lib/storage/data/vitastor/VitastorBackend.ts
+++ b/lib/storage/data/vitastor/VitastorBackend.ts
@ -1,696 +0,0 @@
-// Zenko CloudServer Vitastor data storage backend adapter
-// Copyright (c) Vitaliy Filippov, 2019+
-// License: VNPL-1.1 (see README.md for details)
-
-const stream = require('stream');
-
-const vitastor = require('vitastor');
-
-const VOLUME_MAGIC = 'VstS3Vol';
-const OBJECT_MAGIC = 'VstS3Obj';
-const FLAG_DELETED = 2n;
-
-type Volume = {
-    id: number,
-    partial_sectors: {
-        [key: string]: {
-            buffer: Buffer,
-            refs: number,
-        },
-    },
-    header: {
-        location: string,
-        bucket: string,
-        max_size: number,
-        create_ts: number,
-        used_ts: number,
-        size: number,
-        objects: number,
-        removed_objects: number,
-        object_bytes: number,
-        removed_bytes: number,
-    },
-};
-
-type ObjectHeader = {
-    size: number,
-    key: string,
-    part_num?: number,
-};
-
-class VitastorBackend
-{
-    locationName: string;
-    config: {
-        pool_id: number,
-        metadata_image: string,
-        metadata_pool_id: number,
-        metadata_inode_num: number,
-        size_buckets: number[],
-        size_bucket_mul: number,
-        id_batch_size: number,
-        sector_size: number,
-        write_chunk_size: number,
-        read_chunk_size: number,
-        pack_objects: boolean,
-        // and also other parameters for vitastor itself
-    };
-    next_id: number;
-    alloc_id: number;
-    opened: boolean;
-    on_open: ((...args: any[]) => void)[] | null;
-    open_error: Error | null;
-    cli: any;
-    kv: any;
-    volumes: {
-        [bucket: string]: {
-            [max_size: string]: Volume,
-        },
-    };
-    volumes_by_id: {
-        [id: string]: Volume,
-    };
-    volume_delete_stats: {
-        [id: string]: {
-            count: number,
-            bytes: number,
-        },
-    };
-
-    constructor(locationName, config)
-    {
-        this.locationName = locationName;
-        this.config = config;
-        // validate config
-        this.config.pool_id = Number(this.config.pool_id) || 0;
-        if (!this.config.pool_id)
-            throw new Error('pool_id is required for Vitastor');
-        if (!this.config.metadata_image && (!this.config.metadata_pool_id || !this.config.metadata_inode_num))
-            throw new Error('metadata_image or metadata_inode is required for Vitastor');
-        if (!this.config.size_buckets || !this.config.size_buckets.length)
-            this.config.size_buckets = [ 32*1024, 128*1024, 512*1024, 2*1024, 8*1024 ];
-        this.config.size_bucket_mul = Number(this.config.size_bucket_mul) || 2;
-        this.config.id_batch_size = Number(this.config.id_batch_size) || 100;
-        this.config.sector_size = Number(this.config.sector_size) || 0;
-        if (this.config.sector_size < 4096)
-            this.config.sector_size = 4096;
-        this.config.write_chunk_size = Number(this.config.write_chunk_size) || 0;
-        if (this.config.write_chunk_size < this.config.sector_size)
-            this.config.write_chunk_size = 4*1024*1024; // 4 MB
-        this.config.read_chunk_size = Number(this.config.read_chunk_size) || 0;
-        if (this.config.read_chunk_size < this.config.sector_size)
-            this.config.read_chunk_size = 4*1024*1024; // 4 MB
-        this.config.pack_objects = !!this.config.pack_objects;
-        // state
-        this.next_id = 1;
-        this.alloc_id = 0;
-        this.opened = false;
-        this.on_open = null;
-        this.open_error = null;
-        this.cli = new vitastor.Client(config);
-        this.kv = new vitastor.KV(this.cli);
-        // we group objects into volumes by bucket and size
-        this.volumes = {};
-        this.volumes_by_id = {};
-        this.volume_delete_stats = {};
-    }
-
-    async _makeVolumeId()
-    {
-        if (this.next_id <= this.alloc_id)
-        {
-            return this.next_id++;
-        }
-        const id_key = 'id'+this.config.pool_id;
-        const [ err, prev ] = await new Promise<[ any, string ]>(ok => this.kv.get(id_key, (err, value) => ok([ err, value ])));
-        if (err && err != vitastor.ENOENT)
-        {
-            throw new Error(err);
-        }
-        const new_id = (parseInt(prev) || 0) + 1;
-        this.next_id = new_id;
-        this.alloc_id = this.next_id + this.config.id_batch_size - 1;
-        await new Promise((ok, no) => this.kv.set(id_key, this.alloc_id, err => (err ? no(new Error(err)) : ok(null)), cas_old => cas_old === prev));
-        return this.next_id;
-    }
-
-    async _getVolume(bucketName, size)
-    {
-        if (!this.opened)
-        {
-            if (this.on_open)
-            {
-                await new Promise(ok => this.on_open!.push(ok));
-            }
-            else
-            {
-                this.on_open = [];
-                if (this.config.metadata_image)
-                {
-                    const img = new vitastor.Image(this.cli, this.config.metadata_image);
-                    const info = await new Promise<{ pool_id: number, inode_num: number }>(ok => img.get_info(ok));
-                    this.config.metadata_pool_id = info.pool_id;
-                    this.config.metadata_inode_num = info.inode_num;
-                }
-                const kv_config = {};
-                for (const key in this.config)
-                {
-                    if (key.substr(0, 3) === 'kv_')
-                        kv_config[key] = this.config[key];
-                }
-                this.open_error = await new Promise(ok => this.kv.open(
-                    this.config.metadata_pool_id, this.config.metadata_inode_num,
-                    kv_config, err => ok(err ? new Error(err) : null)
-                ));
-                this.opened = true;
-                this.on_open.map(cb => setImmediate(cb));
-                this.on_open = null;
-            }
-        }
-        if (this.open_error)
-        {
-            throw this.open_error;
-        }
-        let i;
-        for (i = 0; i < this.config.size_buckets.length && size >= this.config.size_buckets[i]; i++) {}
-        let s;
-        if (i < this.config.size_buckets.length)
-            s = this.config.size_buckets[i];
-        else if (this.config.size_bucket_mul > 1)
-        {
-            while (size >= s)
-                s = Math.floor(this.config.size_bucket_mul * s);
-        }
-        if (!this.volumes[bucketName])
-        {
-            this.volumes[bucketName] = {};
-        }
-        if (this.volumes[bucketName][s])
-        {
-            return this.volumes[bucketName][s];
-        }
-        const new_id = await this._makeVolumeId();
-        const new_vol = this.volumes[bucketName][s] = {
-            id: new_id,
-            // FIXME: partial_sectors should be written with CAS because otherwise we may lose quick deletes
-            partial_sectors: {},
-            header: {
-                location: this.locationName,
-                bucket: bucketName,
-                max_size: s,
-                create_ts: Date.now(),
-                used_ts: Date.now(),
-                size: this.config.sector_size, // initial position is right after header
-                objects: 0,
-                removed_objects: 0,
-                object_bytes: 0,
-                removed_bytes: 0,
-            },
-        };
-        this.volumes_by_id[new_id] = new_vol;
-        const header_text = JSON.stringify(this.volumes[bucketName][s].header);
-        const buf = Buffer.alloc(this.config.sector_size);
-        buf.write(VOLUME_MAGIC + header_text, 0);
-        await new Promise((ok, no) => this.cli.write(
-            this.config.pool_id, new_id, 0, buf, err => (err ? no(new Error(err)) : ok(null))
-        ));
-        await new Promise((ok, no) => this.kv.set(
-            'vol_'+this.config.pool_id+'_'+new_id, header_text, err => (err ? no(new Error(err)) : ok(null)), cas_old => !cas_old
-        ));
-        return new_vol;
-    }
-
-    toObjectGetInfo(objectKey, bucketName, storageLocation)
-    {
-        return null;
-    }
-
-    _bufferStart(vol, cur_pos, cur_size, cur_chunks, sector_refs)
-    {
-        if ((cur_pos % this.config.sector_size) ||
-            Math.floor((cur_pos + cur_size) / this.config.sector_size) == Math.floor(cur_pos / this.config.sector_size))
-        {
-            const sect_pos = Math.floor(cur_pos / this.config.sector_size) * this.config.sector_size;
-            const sect = vol.partial_sectors[sect_pos]
-                ? vol.partial_sectors[sect_pos].buffer
-                : Buffer.alloc(this.config.sector_size);
-            if (this.config.pack_objects)
-            {
-                // Save only if <pack_objects>
-                if (!vol.partial_sectors[sect_pos])
-                    vol.partial_sectors[sect_pos] = { buffer: sect, refs: 0 };
-                vol.partial_sectors[sect_pos].refs++;
-                sector_refs.push(sect_pos);
-            }
-            let off = cur_pos % this.config.sector_size;
-            let i = 0;
-            for (; i < cur_chunks.length; i++)
-            {
-                let copy_len = this.config.sector_size - off;
-                copy_len = copy_len > cur_chunks[i].length ? cur_chunks[i].length : copy_len;
-                cur_chunks[i].copy(sect, off, 0, copy_len);
-                off += copy_len;
-                if (copy_len < cur_chunks[i].length)
-                {
-                    cur_chunks[i] = cur_chunks[i].slice(copy_len);
-                    cur_size -= copy_len;
-                    break;
-                }
-                else
-                    cur_size -= cur_chunks[i].length;
-            }
-            cur_chunks.splice(0, i, sect);
-            cur_size += this.config.sector_size;
-            cur_pos = sect_pos;
-        }
-        return [ cur_pos, cur_size ];
-    }
-
-    _bufferEnd(vol, cur_pos, cur_size, cur_chunks, sector_refs, write_all)
-    {
-        const write_pos = cur_pos;
-        const write_chunks = cur_chunks;
-        let write_size = cur_size;
-        cur_chunks = [];
-        cur_pos += cur_size;
-        cur_size = 0;
-        let remain = (cur_pos % this.config.sector_size);
-        if (remain > 0)
-        {
-            cur_pos -= remain;
-            let last_sect = null;
-            if (write_all)
-            {
-                last_sect = vol.partial_sectors[cur_pos]
-                    ? vol.partial_sectors[cur_pos].buffer
-                    : Buffer.alloc(this.config.sector_size);
-                if (this.config.pack_objects)
-                {
-                    // Save only if <pack_objects>
-                    if (!vol.partial_sectors[cur_pos])
-                        vol.partial_sectors[cur_pos] = { buffer: last_sect, refs: 0 };
-                    vol.partial_sectors[cur_pos].refs++;
-                    sector_refs.push(cur_pos);
-                }
-            }
-            write_size -= remain;
-            if (write_size < 0)
-                write_size = 0;
-            for (let i = write_chunks.length-1; i >= 0 && remain > 0; i--)
-            {
-                if (write_chunks[i].length <= remain)
-                {
-                    remain -= write_chunks[i].length;
-                    if (write_all)
-                        write_chunks[i].copy(last_sect, remain);
-                    else
-                        cur_chunks.unshift(write_chunks[i]);
-                    write_chunks.pop();
-                }
-                else
-                {
-                    if (write_all)
-                        write_chunks[i].copy(last_sect, 0, write_chunks[i].length - remain);
-                    else
-                        cur_chunks.unshift(write_chunks[i].slice(write_chunks[i].length - remain));
-                    write_chunks[i] = write_chunks[i].slice(0, write_chunks[i].length - remain);
-                    remain = 0;
-                    i++;
-                }
-            }
-            if (write_all)
-            {
-                write_chunks.push(last_sect);
-                write_size += this.config.sector_size;
-            }
-        }
-        for (const chunk of cur_chunks)
-        {
-            cur_size += chunk.length;
-        }
-        return [ write_pos, write_chunks, write_size, cur_pos, cur_size, cur_chunks ];
-    }
-
-    /**
-     * reqUids: string, // request-ids for log, usually joined by ':'
-     * keyContext: {
-     *     // a lot of shit, basically all metadata
-     *     bucketName,
-     *     objectKey,
-     *     owner?,
-     *     namespace?,
-     *     partNumber?,
-     *     uploadId?,
-     *     metaHeaders?,
-     *     isDeleteMarker?,
-     *     tagging?,
-     *     contentType?,
-     *     cacheControl?,
-     *     contentDisposition?,
-     *     contentEncoding?,
-     * },
-     * callback: (error, objectGetInfo: any) => void,
-     */
-    put(stream, size, keyContext, reqUids, callback)
-    {
-        callback = once(callback);
-        this._getVolume(keyContext.bucketName, size)
-            .then(vol => this._put(vol, stream, size, keyContext, reqUids, callback))
-            .catch(callback);
-    }
-
-    _put(vol, stream, size, keyContext, reqUids, callback)
-    {
-        const object_header: ObjectHeader = {
-            size,
-            key: keyContext.objectKey,
-        };
-        if (keyContext.partNumber)
-        {
-            object_header.part_num = keyContext.partNumber;
-        }
-        // header is: <8 bytes magic> <8 bytes flags> <8 bytes json length> <json>
-        const hdr_begin_buf = Buffer.alloc(24);
-        const hdr_json_buf = Buffer.from(JSON.stringify(object_header), 'utf-8');
-        hdr_begin_buf.write(OBJECT_MAGIC);
-        hdr_begin_buf.writeBigInt64LE(BigInt(hdr_json_buf.length), 16);
-        const object_header_buf = Buffer.concat([ hdr_begin_buf, hdr_json_buf ]);
-        const object_pos = vol.header.size;
-        const object_get_info = { volume: vol.id, offset: object_pos, hdrlen: object_header_buf.length, size };
-        let cur_pos = object_pos;
-        let cur_chunks = [ object_header_buf ];
-        let cur_size = object_header_buf.length;
-        let err: Error|null = null;
-        let waiting = 1; // 1 for end or error, 1 for each write request
-        vol.header.size += object_header_buf.length + size;
-        if (!this.config.pack_objects && (vol.header.size % this.config.sector_size))
-        {
-            vol.header.size += this.config.sector_size - (vol.header.size % this.config.sector_size);
-        }
-        const writeChunk = (last) =>
-        {
-            const sector_refs = [];
-            // Handle partial beginning
-            [ cur_pos, cur_size ] = this._bufferStart(vol, cur_pos, cur_size, cur_chunks, sector_refs);
-            // Handle partial end
-            let write_pos, write_chunks, write_size;
-            [ write_pos, write_chunks, write_size, cur_pos, cur_size, cur_chunks ] = this._bufferEnd(vol, cur_pos, cur_size, cur_chunks, sector_refs, last);
-            waiting++;
-            // FIXME: pool_id: maybe it should be stored in volume metadata to allow to migrate volumes?
-            this.cli.write(this.config.pool_id, vol.id, write_pos, write_chunks, (res) =>
-            {
-                for (const sect of sector_refs)
-                {
-                    vol.partial_sectors[sect].refs--;
-                    if (!vol.partial_sectors[sect].refs &&
-                        vol.header.size >= sect+this.config.sector_size)
-                    {
-                        // Forget partial data when it's not needed anymore
-                        delete(vol.partial_sectors[sect]);
-                    }
-                }
-                waiting--;
-                if (res)
-                {
-                    err = new Error(res);
-                    waiting--;
-                }
-                if (!waiting)
-                {
-                    callback(err, err ? null : object_get_info);
-                }
-            });
-        };
-        // Stream data
-        stream.on('error', (e) =>
-        {
-            err = e;
-            waiting--;
-            if (!waiting)
-            {
-                callback(err, null);
-            }
-        });
-        stream.on('end', () =>
-        {
-            if (err)
-            {
-                return;
-            }
-            waiting--;
-            if (cur_size)
-            {
-                // write last chunk
-                writeChunk(true);
-            }
-            if (!waiting)
-            {
-                callback(null, object_get_info);
-            }
-        });
-        stream.on('data', (chunk) =>
-        {
-            if (err)
-            {
-                return;
-            }
-            cur_chunks.push(chunk);
-            cur_size += chunk.length;
-            if (cur_size >= this.config.write_chunk_size)
-            {
-                // got a complete chunk, write it out
-                writeChunk(false);
-            }
-        });
-    }
-
-    /**
-     * objectGetInfo: {
-     *   key: { volume, offset, hdrlen, size }, // from put
-     *   size,
-     *   start,
-     *   dataStoreName,
-     *   dataStoreETag,
-     *   range,
-     *   response: ServerResponse,
-     * },
-     * range?: [ start, end ], // like in HTTP - first byte index, last byte index
-     * callback: (error, readStream) => void,
-     */
-    get(objectGetInfo, range, reqUids, callback)
-    {
-        if (!(objectGetInfo instanceof Object) || !objectGetInfo.key ||
-            !(objectGetInfo.key instanceof Object) || !objectGetInfo.key.volume ||
-            !objectGetInfo.key.offset || !objectGetInfo.key.hdrlen || !objectGetInfo.key.size)
-        {
-            throw new Error('objectGetInfo must be { key: { volume, offset, hdrlen, size } }, but is '+JSON.stringify(objectGetInfo));
-        }
-        const [ start, end ] = range || [];
-        if (start < 0 || end < 0 || end != null && start != null && end < start || start >= objectGetInfo.key.size)
-        {
-            throw new Error('Invalid range: '+start+'-'+end);
-        }
-        let offset = objectGetInfo.key.offset + objectGetInfo.key.hdrlen + (start || 0);
-        let len = objectGetInfo.key.size - (start || 0);
-        if (end)
-        {
-            const len2 = end - (start || 0) + 1;
-            if (len2 < len)
-                len = len2;
-        }
-        callback(null, new VitastorReadStream(this.cli, objectGetInfo.key.volume, offset, len, this.config));
-    }
-
-    /**
-     * objectGetInfo: {
-     *   key: { volume, offset, hdrlen, size }, // from put
-     *   size,
-     *   start,
-     *   dataStoreName,
-     *   dataStoreETag,
-     *   range,
-     *   response: ServerResponse,
-     * },
-     * callback: (error) => void,
-     */
-    delete(objectGetInfo, reqUids, callback)
-    {
-        callback = once(callback);
-        this._delete(objectGetInfo, reqUids)
-            .then(callback)
-            .catch(callback);
-    }
-
-    async _delete(objectGetInfo, reqUids)
-    {
-        if (!(objectGetInfo instanceof Object) || !objectGetInfo.key ||
-            !(objectGetInfo.key instanceof Object) || !objectGetInfo.key.volume ||
-            !objectGetInfo.key.offset || !objectGetInfo.key.hdrlen || !objectGetInfo.key.size)
-        {
-            throw new Error('objectGetInfo must be { key: { volume, offset, hdrlen, size } }, but is '+JSON.stringify(objectGetInfo));
-        }
-        const in_sect_pos = (objectGetInfo.key.offset % this.config.sector_size);
-        const sect_pos = objectGetInfo.key.offset - in_sect_pos;
-        const vol = this.volumes_by_id[objectGetInfo.key.volume];
-        if (vol && vol.partial_sectors[sect_pos])
-        {
-            // The sector may still be written to in corner cases
-            const sect = vol.partial_sectors[sect_pos];
-            const flags = sect.buffer.readBigInt64LE(in_sect_pos + 8);
-            if (!(flags & FLAG_DELETED))
-            {
-                const del_stat = this.volume_delete_stats[vol.id] = (this.volume_delete_stats[vol.id] || { count: 0, bytes: 0 });
-                del_stat.count++;
-                del_stat.bytes += objectGetInfo.key.size;
-                sect.buffer.writeBigInt64LE(flags | FLAG_DELETED, in_sect_pos + 8);
-                sect.refs++;
-                const err = await new Promise<any>(ok => this.cli.write(this.config.pool_id, objectGetInfo.key.volume, sect_pos, sect.buffer, ok));
-                sect.refs--;
-                if (err)
-                {
-                    sect.buffer.writeBigInt64LE(0n, in_sect_pos + 8);
-                    throw new Error(err);
-                }
-            }
-        }
-        else
-        {
-            // RMW with CAS
-            const [ err, buf, version ] = await new Promise<[ any, Buffer, bigint ]>(ok => this.cli.read(
-                this.config.pool_id, objectGetInfo.key.volume, sect_pos, this.config.sector_size,
-                (err, buf, version) => ok([ err, buf, version ])
-            ));
-            if (err)
-            {
-                throw new Error(err);
-            }
-            // FIXME What if JSON crosses sector boundary? Prevent it if we want to pack objects
-            const magic = buf.slice(in_sect_pos, in_sect_pos+8).toString();
-            const flags = buf.readBigInt64LE(in_sect_pos+8);
-            const json_len = Number(buf.readBigInt64LE(in_sect_pos+16));
-            let json_hdr;
-            if (in_sect_pos+24+json_len <= buf.length)
-            {
-                try
-                {
-                    json_hdr = JSON.parse(buf.slice(in_sect_pos+24, in_sect_pos+24+json_len).toString());
-                }
-                catch (e)
-                {
-                }
-            }
-            if (magic !== OBJECT_MAGIC || !json_hdr || json_hdr.size !== objectGetInfo.key.size)
-            {
-                throw new Error(
-                    'header of object with size '+objectGetInfo.key.size+
-                    ' bytes not found in volume '+objectGetInfo.key.volume+' at '+objectGetInfo.key.offset
-                );
-            }
-            else if (!(flags & FLAG_DELETED))
-            {
-                buf.writeBigInt64LE(flags | FLAG_DELETED, in_sect_pos + 8);
-                const err = await new Promise<any>(ok => this.cli.write(this.config.pool_id, objectGetInfo.key.volume, sect_pos, buf, { version: version+1n }, ok));
-                if (err == vitastor.EINTR)
-                {
-                    // Retry
-                    await this._delete(objectGetInfo, reqUids);
-                }
-                else if (err)
-                {
-                    throw new Error(err);
-                }
-                else
-                {
-                    // FIXME: Write deletion statistics to volumes
-                    // FIXME: Implement defragmentation
-                    const del_stat = this.volume_delete_stats[objectGetInfo.key.volume] = (this.volume_delete_stats[objectGetInfo.key.volume] || { count: 0, bytes: 0 });
-                    del_stat.count++;
-                    del_stat.bytes += objectGetInfo.key.size;
-                }
-            }
-        }
-    }
-
-    /**
-     * config: full zenko server config,
-     * callback: (error, stats) => void, // stats is the returned statistics in arbitrary format
-     */
-    getDiskUsage(config, reqUids, callback)
-    {
-        // FIXME: Iterate all volumes and return its sizes and deletion statistics, or maybe just sizes
-        callback(null, {});
-    }
-}
-
-class VitastorReadStream extends stream.Readable
-{
-    constructor(cli, volume_id, offset, len, config, options = undefined)
-    {
-        super(options);
-        this.cli = cli;
-        this.volume_id = volume_id;
-        this.offset = offset;
-        this.end = offset + len;
-        this.pos = offset;
-        this.config = config;
-        this._reading = false;
-    }
-
-    _read(n)
-    {
-        if (this._reading)
-        {
-            return;
-        }
-        // FIXME: Validate object header
-        const chunk_size = n && this.config.read_chunk_size < n ? n : this.config.read_chunk_size;
-        const read_offset = this.pos;
-        const round_offset = read_offset - (read_offset % this.config.sector_size);
-        let read_end = this.end <= read_offset+chunk_size ? this.end : read_offset+chunk_size;
-        const round_end = (read_end % this.config.sector_size)
-            ? read_end + this.config.sector_size - (read_end % this.config.sector_size)
-            : read_end;
-        if (round_end <= this.end)
-            read_end = round_end;
-        this.pos = read_end;
-        if (read_end <= read_offset)
-        {
-            // EOF
-            this.push(null);
-            return;
-        }
-        this._reading = true;
-        this.cli.read(this.config.pool_id, this.volume_id, round_offset, round_end-round_offset, (err, buf, version) =>
-        {
-            this._reading = false;
-            if (err)
-            {
-                this.destroy(new Error(err));
-                return;
-            }
-            if (read_offset != round_offset || round_end != read_end)
-            {
-                buf = buf.subarray(read_offset-round_offset, buf.length-(round_end-read_end));
-            }
-            if (this.push(buf))
-            {
-                this._read(n);
-            }
-        });
-    }
-}
-
-function once(callback)
-{
-    let called = false;
-    return function()
-    {
-        if (!called)
-        {
-            called = true;
-            callback.apply(null, arguments);
-        }
-    };
-}
-
-module.exports = VitastorBackend;
--- a/lib/storage/metadata/MetadataWrapper.js
+++ b/lib/storage/metadata/MetadataWrapper.js
@ -226,19 +226,6 @@ class MetadataWrapper {
        });
    }

-    getBucketQuota(bucketName, log, cb) {
-        log.debug('getting bucket quota from metadata');
-        this.client.getBucketAttributes(bucketName, log, (err, data) => {
-            if (err) {
-                log.debug('error from metadata', { implName: this.implName,
-                    error: err });
-                return cb(err);
-            }
-            const bucketInfo = BucketInfo.fromObj(data);
-            return cb(err, { quota: bucketInfo.getQuota() });
-        });
-    }
-
    deleteBucket(bucketName, log, cb) {
        log.debug('deleting bucket from metadata');
        this.client.deleteBucket(bucketName, log, err => {
@ -292,28 +279,22 @@ class MetadataWrapper {
            });
    }

-    getObjectsMD(bucketName, objNamesWithParams, log, cb) {
-        if (typeof this.client.getObjects !== 'function') {
-            log.debug('backend does not support get object metadata with batching', {
-                implName: this.implName,
-            });
-            return cb(errors.NotImplemented);
-        }
-        log.debug('getting objects from metadata', { objects: objNamesWithParams });
-        return this.client.getObjects(bucketName, objNamesWithParams, log, (err, data) => {
+    getObjectMD(bucketName, objName, params, log, cb) {
+        log.debug('getting object from metadata');
+        this.client.getObject(bucketName, objName, params, log, (err, data) => {
            if (err) {
-                log.debug('error getting objects from metadata', { implName: this.implName, objects: objNamesWithParams,
+                log.debug('error from metadata', { implName: this.implName,
                    err });
                return cb(err);
            }
-            log.debug('objects retrieved from metadata', { objects: objNamesWithParams });
+            log.debug('object retrieved from metadata');
            return cb(err, data);
        });
    }

-    getObjectMD(bucketName, objName, params, log, cb) {
+    getObjectsMD(bucketName, objNamesWithParams, log, cb) {
        log.debug('getting object from metadata');
-        this.client.getObject(bucketName, objName, params, log, (err, data) => {
+        this.client.getObjects(bucketName, objNamesWithParams, log, (err, data) => {
            if (err) {
                log.debug('error from metadata', { implName: this.implName,
                    err });
--- a/lib/storage/metadata/bucketclient/BucketClientInterface.js
+++ b/lib/storage/metadata/bucketclient/BucketClientInterface.js
@ -1,5 +1,6 @@
 const assert = require('assert');

+const errors = require('../../../errors').default;
 const BucketInfo = require('../../../models/BucketInfo').default;

 class BucketClientInterface {
@ -111,14 +112,7 @@ class BucketClientInterface {
    }

    listLifecycleObject(bucketName, params, log, cb) {
-        this.client.listObject(bucketName, log.getSerializedUids(), params,
-            (err, data) => {
-                if (err) {
-                    return cb(err);
-                }
-                return cb(null, JSON.parse(data));
-            });
-        return null;
+        return process.nextTick(cb, errors.NotImplemented);
    }

    listMultipartUploads(bucketName, params, log, cb) {
--- a/lib/storage/metadata/file/BucketFileInterface.js
+++ b/lib/storage/metadata/file/BucketFileInterface.js
@ -326,7 +326,7 @@ class BucketFileInterface {
    }

    listLifecycleObject(bucketName, params, log, cb) {
-        return this.internalListObject(bucketName, params, log, cb);
+        return process.nextTick(cb, errors.NotImplemented);
    }

    listMultipartUploads(bucketName, params, log, cb) {
--- a/lib/storage/metadata/mongoclient/MongoClientInterface.js
+++ b/lib/storage/metadata/mongoclient/MongoClientInterface.js
@ -899,130 +899,35 @@ class MongoClientInterface {
            return cb(errors.InternalError);
        });
    }
+
    /**
-     * Puts an object into a MongoDB collection.
-     * Depending on the parameters, the object is either directly put into the collection
-     * or the existing object is marked as deleted and a new object is inserted.
-     *
-     * @param {Object} collection - The MongoDB collection to put the object into.
-     * @param {string} bucketName - The name of the bucket the object belongs to.
-     * @param {string} objName - The name of the object.
-     * @param {Object} value - The value of the object.
-     * @param {Object} params - Additional parameters.
-     * @param {string} params.vFormat - object key format.
-     * @param {boolean} params.needOplogUpdate - If true, the object is directly put into the collection
-     * with updating the operation log.
-     * @param {Object} log - The logger to use.
-     * @param {Function} cb - The callback function to call when the operation is complete. It is called with an error
-     * if there is an issue with the operation.
-     * @returns {Promise} A promise that resolves when the operation is complete. The promise is rejected with an error
-     * if there is an issue with the operation.
+     * Put object when versioning is not enabled
+     * @param {Object} c bucket collection
+     * @param {String} bucketName bucket name
+     * @param {String} objName object name
+     * @param {Object} objVal object metadata
+     * @param {Object} params params
+     * @param {Object} log logger
+     * @param {Function} cb callback
+     * @return {undefined}
     */
-    putObjectNoVer(collection, bucketName, objName, value, params, log, cb) {
-        if (params?.needOplogUpdate) {
-            return this.putObjectNoVerWithOplogUpdate(collection, bucketName, objName, value, params, log, cb);
-        }
-        const key = formatMasterKey(objName, params.vFormat);
-        const putFilter = { _id: key };
-        return collection.updateOne(putFilter, {
+    putObjectNoVer(c, bucketName, objName, objVal, params, log, cb) {
+        const masterKey = formatMasterKey(objName, params.vFormat);
+        c.updateOne({
+            _id: masterKey,
+        }, {
            $set: {
-                _id: key,
-                value,
+                _id: masterKey,
+                value: objVal,
            },
        }, {
            upsert: true,
-        }).then(() => cb()).catch(err => {
+        }).then(() => cb()).catch((err) => {
            log.error('putObjectNoVer: error putting obect with no versioning', { error: err.message });
            return cb(errors.InternalError);
        });
    }

-    /**
-     * Updates an object in a MongoDB collection without changing its version.
-     * If the object doesn't exist, it will be created (upsert is true for the second update operation).
-     * The operation is logged in the oplog.
-     *
-     * @param {Object} collection - The MongoDB collection to update the object in.
-     * @param {string} bucketName - The name of the bucket the object belongs to.
-     * @param {string} objName - The name of the object.
-     * @param {Object} value - The new value of the object.
-     * @param {Object} params - Additional parameters.
-     * @param {string} params.vFormat - object key format
-     * @param {string} params.originOp - origin operation
-     * @param {Object} log - The logger to use.
-     * @param {Function} cb - The callback function to call when the operation is complete.
-     * It is called with an error if there is an issue with the operation.
-     * @returns {void}
-     */
-    putObjectNoVerWithOplogUpdate(collection, bucketName, objName, value, params, log, cb) {
-        const key = formatMasterKey(objName, params.vFormat);
-        const putFilter = { _id: key };
-        // filter used when finding and updating object
-        const findFilter = {
-            ...putFilter,
-            $or: [
-                { 'value.deleted': { $exists: false } },
-                { 'value.deleted': { $eq: false } },
-            ],
-        };
-        const updateDeleteFilter = {
-            ...putFilter,
-            'value.deleted': true,
-        };
-        return async.waterfall([
-            // Adding delete flag when getting the object
-            // to avoid having race conditions.
-            next => collection.findOneAndUpdate(findFilter, {
-                $set: updateDeleteFilter,
-            }, {
-                upsert: false,
-            }).then(doc => {
-                if (!doc.value) {
-                    log.error('internalPutObject: unable to find target object to update',
-                        { bucket: bucketName, object: key });
-                    return next(errors.NoSuchKey);
-                }
-                const obj = doc.value;
-                const objMetadata = new ObjectMD(obj.value);
-                objMetadata.setOriginOp(params.originOp);
-                objMetadata.setDeleted(true);
-                return next(null, objMetadata.getValue());
-            }).catch(err => {
-                log.error('internalPutObject: error getting object',
-                    { bucket: bucketName, object: key, error: err.message });
-                return next(errors.InternalError);
-            }),
-            // We update the full object to get the whole object metadata
-            // in the oplog update event
-            (objMetadata, next) => collection.bulkWrite([
-                {
-                    updateOne: {
-                        filter: updateDeleteFilter,
-                        update: {
-                            $set: { _id: key, value: objMetadata },
-                        },
-                        upsert: false,
-                    },
-                },
-                {
-                    updateOne: {
-                        filter: putFilter,
-                        update: {
-                            $set: { _id: key, value },
-                        },
-                        upsert: true,
-                    },
-                },
-            ], { ordered: true }).then(() => next(null)).catch(next),
-        ], (err) => {
-            if (err) {
-                log.error('internalPutObject: error updating object',
-                    { bucket: bucketName, object: key, error: err.message });
-                return cb(errors.InternalError);
-            }
-            return cb();
-        });
-    }
    /**
     * Returns the putObjectVerCase function to use
     * depending on params
@ -1068,7 +973,8 @@ class MongoClientInterface {
                return putObjectVer(c, bucketName, objName, objVal, _params, log,
                    cb);
            }
-            return this.putObjectNoVer(c, bucketName, objName, objVal, _params, log, cb);
+            return this.putObjectNoVer(c, bucketName, objName, objVal,
+                _params, log, cb);
        });
    }

@ -1135,62 +1041,53 @@ class MongoClientInterface {
        ], cb);
    }

-    /**
-     * gets object metadata for a list of objects
-     * @param {String} bucketName bucket name
-     * @param {Array} objects array of objects
-     * @param {Object} log logger
-     * @param {Function} callback callback
-     * @return {undefined}
-     */
    getObjects(bucketName, objects, log, callback) {
        const c = this.getCollection(bucketName);
        let vFormat = null;
-        if (!Array.isArray(objects)) {
-            return callback(errors.InternalError.customizeDescription('objects must be an array'));
-        }
-        // We do not accept more than 1000 keys in a single request
-        if (objects.length > 1000) {
-            return callback(errors.InternalError.customizeDescription('cannot get more than 1000 objects'));
-        }
        // Function to process each document
        const processDoc = (doc, objName, params, key, cb) => {
-            const versionIdValue = params && params.versionId ? params.versionId : undefined;
-            if (!doc && versionIdValue) {
-                // If no document and a version ID is provided, return an error.
+            if (!doc && params && params.versionId) {
                return cb(null, {
-                    err: errors.NoSuchKey,
                    doc: null,
-                    versionId: versionIdValue,
+                    versionId: params.versionId,
                    key,
                });
            }
-            // If no master found then object is either non existent or last
-            // version is delete marker
+            // If no master found then object is either non existent
+            // or last version is delete marker
            if (!doc || doc.value.isPHD) {
-                return this.getLatestVersion(c, objName, vFormat, log, (err, _doc) => cb(null, {
-                    err,
-                    doc: _doc || null,
-                    versionId: versionIdValue,
-                    key,
-                }));
+                return this.getLatestVersion(c, objName, vFormat, log, (err, doc) => {
+                    if (err && !err.is.NoSuchKey) {
+                        return cb(err);
+                    }
+                    return cb(null, {
+                        doc: doc || null,
+                        versionId: params.versionId,
+                        key,
+                    });
+                });
            }
            MongoUtils.unserialize(doc.value);
            return cb(null, {
-                err: null,
                doc: doc.value,
-                versionId: versionIdValue,
+                versionId: params.versionId,
                key,
            });
        };
-        return this.getBucketVFormat(bucketName, log, (err, _vFormat) => {
+        this.getBucketVFormat(bucketName, log, (err, _vFormat) => {
            if (err) {
                return callback(err);
            }
            vFormat = _vFormat;
-            const keys = objects.map(({ key: objName, params }) => (params && params.versionId
-                ? formatVersionKey(objName, params.versionId, vFormat)
-                : formatMasterKey(objName, vFormat)));
+            // Create keys, maintaining the context with each key
+            const keysAndObjects = objects.map(({ key: objName, params }) => {
+                const _key = params && params.versionId
+                    ? formatVersionKey(objName, params.versionId, vFormat)
+                    : formatMasterKey(objName, vFormat);
+                return { key: _key, objName, params };
+            });
+            // Extract keys and find documents
+            const keys = keysAndObjects.map(o => o.key);
            return c.find({
                _id: { $in: keys },
                $or: [
@ -1201,14 +1098,10 @@ class MongoClientInterface {
                // Create a Map to quickly find docs by their keys
                const docByKey = new Map(docs.map(doc => [doc._id, doc]));
                // Process each document using associated context (objName, params)
-                async.mapLimit(objects, constants.maxBatchingConcurrentOperations,
-                    ({ key: objName, params }, cb) => {
-                        const key = params && params.versionId
-                            ? formatVersionKey(objName, params.versionId, vFormat)
-                            : formatMasterKey(objName, vFormat);
-                        const doc = docByKey.get(key);
-                        processDoc(doc, objName, params, key, cb);
-                    }, callback);
+                async.mapLimit(keysAndObjects, 5, ({ key, objName, params }, cb) => {
+                    const doc = docByKey.get(key);
+                    processDoc(doc, objName, params, key, cb);
+                }, callback);
            }).catch(err => {
                callback(err);
            });
@ -1373,7 +1266,7 @@ class MongoClientInterface {
                    'value.isPHD': true,
                    'value.versionId': mst.versionId,
                };
-                this.internalDeleteObject(c, bucketName, masterKey, filter, null, log, err => {
+                this.internalDeleteObject(c, bucketName, masterKey, filter, log, err => {
                    if (err) {
                        // the PHD master might get updated when a PUT is performed
                        // before the repair is done, we don't want to return an error
@ -1444,7 +1337,7 @@ class MongoClientInterface {
                .then(() => next())
                .catch(err => next(err)),
            // delete version
-            next => this.internalDeleteObject(c, bucketName, versionKey, {}, params, log,
+            next => this.internalDeleteObject(c, bucketName, versionKey, {}, log,
                err => {
                    // we don't return an error in case we don't find
                    // a version as we expect this case when dealing with
@ -1453,7 +1346,7 @@ class MongoClientInterface {
                        return next(null);
                    }
                    return next(err);
-                }, originOp),
+                }, originOp, params),
        ], err => {
            if (err) {
                log.error(
@ -1481,7 +1374,7 @@ class MongoClientInterface {
     */
    deleteObjectVerNotMaster(c, bucketName, objName, params, log, cb, originOp = 's3:ObjectRemoved:Delete') {
        const versionKey = formatVersionKey(objName, params.versionId, params.vFormat);
-        this.internalDeleteObject(c, bucketName, versionKey, {}, params, log, err => {
+        this.internalDeleteObject(c, bucketName, versionKey, {}, log, err => {
            if (err) {
                if (err.is.NoSuchKey) {
                    log.error(
@ -1495,7 +1388,7 @@ class MongoClientInterface {
                return cb(errors.InternalError);
            }
            return cb(null);
-        }, originOp);
+        }, originOp, params);
    }

    /**
@ -1572,7 +1465,7 @@ class MongoClientInterface {
     */
    deleteObjectNoVer(c, bucketName, objName, params, log, cb, originOp = 's3:ObjectRemoved:Delete') {
        const masterKey = formatMasterKey(objName, params.vFormat);
-        this.internalDeleteObject(c, bucketName, masterKey, {}, params, log, err => {
+        this.internalDeleteObject(c, bucketName, masterKey, {}, log, err => {
            if (err) {
                // Should not return an error when no object is found
                if (err.is.NoSuchKey) {
@ -1584,7 +1477,7 @@ class MongoClientInterface {
                return cb(errors.InternalError);
            }
            return cb(null);
-        }, originOp);
+        }, originOp, params);
    }

    /**
@ -1595,20 +1488,21 @@ class MongoClientInterface {
     * @param {string} bucketName bucket name
     * @param {string} key Key of the object to delete
     * @param {object} filter additional query filters
-     * @param {object} params request params
-     * @param {Logger} log logger instance
+     * @param {Logger}log logger instance
     * @param {Function} cb callback containing error
     * and BulkWriteResult
     * @param {String} [originOp=s3:ObjectRemoved:Delete] origin operation
+     * @param {object} [params] request params
     * @return {undefined}
     */
-    internalDeleteObject(collection, bucketName, key, filter, params, log, cb, originOp = 's3:ObjectRemoved:Delete') {
+    internalDeleteObject(collection, bucketName, key, filter, log, cb, originOp = 's3:ObjectRemoved:Delete',
+        params = null) {
        // filter used when deleting object
        const deleteFilter = Object.assign({
            _id: key,
        }, filter);

-        if (params && params.doesNotNeedOpogUpdate) {
+        if (params?.shouldOnlyDelete) {
            // If flag is true, directly delete object
            return collection.deleteOne(deleteFilter)
                .then(() => cb(null))
@ -1619,7 +1513,7 @@ class MongoClientInterface {
                });
        }

-        // filter used when finding and updating object
+        // If flag is false, proceed with normal operations
        const findFilter = Object.assign({
            _id: key,
            $or: [
@ -1632,6 +1526,7 @@ class MongoClientInterface {
            '_id': key,
            'value.deleted': true,
        }, filter);
+
        return async.waterfall([
            // Adding delete flag when getting the object
            // to avoid having race conditions.
@ -1660,8 +1555,8 @@ class MongoClientInterface {
            }),
            // We update the full object to get the whole object metadata
            // in the oplog update event
-            (objMetadata, next) => collection.bulkWrite([
-                {
+            (objMetadata, next) => {
+                const operations = [{
                    updateOne: {
                        filter: updateDeleteFilter,
                        update: {
@ -1669,12 +1564,17 @@ class MongoClientInterface {
                        },
                        upsert: false,
                    },
-                }, {
+                }];
+
+                // Add the delete operation if the shouldDelete flag is true
+                operations.push({
                    deleteOne: {
                        filter: updateDeleteFilter,
                    },
-                },
-            ], { ordered: true }).then(() => next(null)).catch(() => next()),
+                });
+
+                collection.bulkWrite(operations, { ordered: true }).then(() => next(null)).catch(() => next());
+            },
        ], (err, res) => {
            if (err) {
                if (err.is.NoSuchKey) {
@ -1734,13 +1634,10 @@ class MongoClientInterface {
    internalListObject(bucketName, params, extension, vFormat, log, cb) {
        const c = this.getCollection(bucketName);
        const getLatestVersion = this.getLatestVersion;
-        const cbOnce = jsutil.once(cb);
        let stream;
-        let baseStream;
        if (!params.secondaryStreamParams) {
            // listing masters only (DelimiterMaster)
            stream = new MongoReadStream(c, params.mainStreamParams, params.mongifiedSearch);
-            baseStream = stream;
            if (vFormat === BUCKET_VERSIONS.v1) {
                /**
                 * When listing masters only in v1 we can't just skip PHD
@ -1782,22 +1679,6 @@ class MongoClientInterface {
                    },
                });
                stream = stream.pipe(resolvePhdKey);
-                // Propagate the 'end' event from resolvePhdKey to stream
-                // to properly cleanup resources.
-                resolvePhdKey.on('end', () => {
-                    baseStream.emit('end');
-                });
-                baseStream.on('error', err => {
-                    const logObj = {
-                        rawError: err,
-                        error: err.message,
-                        errorStack: err.stack,
-                    };
-                    log.error(
-                        'internalListObjectV1: error listing objects', logObj);
-                    baseStream.destroy();
-                    return cbOnce(err);
-                });
            }
        } else {
            // listing both master and version keys (delimiterVersion Algo)
@ -1812,6 +1693,7 @@ class MongoClientInterface {
            extension,
            gte: gteParams,
        });
+        const cbOnce = jsutil.once(cb);
        skip.setListingEndCb(() => {
            stream.emit('end');
            stream.destroy();
@ -1848,14 +1730,10 @@ class MongoClientInterface {
                };
                log.error(
                    'internalListObjectV1: error listing objects', logObj);
-                // call explicitly the destroy method to clean the mongodb cursor
-                stream.destroy();
                cbOnce(err);
            })
            .on('end', () => {
                const data = extension.result();
-                // call explicitly the destroy method to clean the mongodb cursor
-                stream.destroy();
                cbOnce(null, data);
            });
        return undefined;
@ -1915,14 +1793,19 @@ class MongoClientInterface {
                return cb(err);
            }

+            if (vFormat !== BUCKET_VERSIONS.v1) {
+                log.error('not supported bucket format version',
+                    { method: 'listLifecycleObject', bucket: bucketName, vFormat });
+                return cb(errors.NotImplemented.customizeDescription('Not supported bucket format version'));
+            }
+
            const extName = params.listingType;

            const extension = new listAlgos[extName](params, log, vFormat);
-            const extensionParams = extension.genMDParams();
+            const mainStreamParams = extension.genMDParams();

            const internalParams = {
-                mainStreamParams: Array.isArray(extensionParams) ? extensionParams[0] : extensionParams,
-                secondaryStreamParams: Array.isArray(extensionParams) ? extensionParams[1] : null,
+                mainStreamParams,
            };

            return this.internalListObject(bucketName, internalParams, extension, vFormat, log, cb);
@ -2150,20 +2033,14 @@ class MongoClientInterface {
                return cb(err);
            }
            const { bucketCount, bucketInfos } = res;
-            let bucketWithQuotaCount = 0;

-            const retBucketInfos = bucketInfos.map(bucket => {
-                if (bucket.getQuota()) {
-                    bucketWithQuotaCount++;
-                }
-                return {
-                    name: bucket.getName(),
-                    location: bucket.getLocationConstraint(),
-                    isVersioned: !!bucket.getVersioningConfiguration(),
-                    ownerCanonicalId: bucket.getOwner(),
-                    ingestion: bucket.isIngestionBucket(),
-                };
-            });
+            const retBucketInfos = bucketInfos.map(bucket => ({
+                name: bucket.getName(),
+                location: bucket.getLocationConstraint(),
+                isVersioned: !!bucket.getVersioningConfiguration(),
+                ownerCanonicalId: bucket.getOwner(),
+                ingestion: bucket.isIngestionBucket(),
+            }));

            return this.readCountItems(log, (err, results) => {
                if (err) {
@ -2173,7 +2050,6 @@ class MongoClientInterface {
                /* eslint-disable */
                results.bucketList = retBucketInfos;
                results.buckets = bucketCount;
-                results.bucketWithQuotaCount = bucketWithQuotaCount;
                /* eslint-enable */
                return cb(null, results);
            });
@ -2559,7 +2435,7 @@ class MongoClientInterface {
                });
                return cb(errors.InternalError);
            }
-            return this.internalDeleteObject(c, bucketName, masterKey, filter, null, log,
+            return this.internalDeleteObject(c, bucketName, masterKey, filter, log,
                err => {
                    if (err) {
                        // unable to find an object that matches the conditions
--- a/lib/storage/metadata/mongoclient/readStream.js
+++ b/lib/storage/metadata/mongoclient/readStream.js
@ -85,8 +85,7 @@ class MongoReadStream extends Readable {
            Object.assign(query, searchOptions);
        }

-        const projection = { 'value.location': 0 };
-        this._cursor = c.find(query, { projection }).sort({
+        this._cursor = c.find(query).sort({
            _id: options.reverse ? -1 : 1,
        });
        if (options.limit && options.limit !== -1) {
--- a/lib/storage/utils.js
+++ b/lib/storage/utils.js
@ -10,21 +10,21 @@ function trySetDirSyncFlag(path) {

    const GETFLAGS = 2148034049;
    const SETFLAGS = 1074292226;
-    const FS_DIRSYNC_FL = 65536n;
+    const FS_DIRSYNC_FL = 65536;
    const buffer = Buffer.alloc(8, 0);
    const pathFD = fs.openSync(path, 'r');
    const status = ioctl(pathFD, GETFLAGS, buffer);
    assert.strictEqual(status, 0);
-    const currentFlags = buffer.readBigInt64LE(0);
+    const currentFlags = buffer.readUIntLE(0, 8);
    const flags = currentFlags | FS_DIRSYNC_FL;
-    buffer.writeBigInt64LE(flags, 0);
+    buffer.writeUIntLE(flags, 0, 8);
    const status2 = ioctl(pathFD, SETFLAGS, buffer);
    assert.strictEqual(status2, 0);
    fs.closeSync(pathFD);
    const pathFD2 = fs.openSync(path, 'r');
    const confirmBuffer = Buffer.alloc(8, 0);
    ioctl(pathFD2, GETFLAGS, confirmBuffer);
-    assert.strictEqual(confirmBuffer.readBigInt64LE(0),
+    assert.strictEqual(confirmBuffer.readUIntLE(0, 8),
        currentFlags | FS_DIRSYNC_FL, 'FS_DIRSYNC_FL not set');
    fs.closeSync(pathFD2);
 }
--- a/lib/versioning/Version.ts
+++ b/lib/versioning/Version.ts
@ -3,7 +3,7 @@ import { VersioningConstants } from './constants';
 const VID_SEP = VersioningConstants.VersionId.Separator;
 /**
 * Class for manipulating an object version.
- * The format of a version: { isNull, isNull2, isDeleteMarker, versionId, otherInfo }
+ * The format of a version: { isNull, isDeleteMarker, versionId, otherInfo }
 *
 * @note Some of these functions are optimized based on string search
 * prior to a full JSON parse/stringify. (Vinh: 18K op/s are achieved
@ -13,31 +13,24 @@ const VID_SEP = VersioningConstants.VersionId.Separator;
 export class Version {
    version: {
        isNull?: boolean;
-        isNull2?: boolean;
        isDeleteMarker?: boolean;
        versionId?: string;
        isPHD?: boolean;
-        nullVersionId?: string;
    };

    /**
     * Create a new version instantiation from its data object.
     * @param version - the data object to instantiate
     * @param version.isNull - is a null version
-     * @param version.isNull2 - Whether new version is null or not AND has
-     * been put with a Cloudserver handling null keys (i.e. supporting
-     * S3C-7352)
     * @param version.isDeleteMarker - is a delete marker
     * @param version.versionId - the version id
     * @constructor
     */
    constructor(version?: {
        isNull?: boolean;
-        isNull2?: boolean;
        isDeleteMarker?: boolean;
        versionId?: string;
        isPHD?: boolean;
-        nullVersionId?: string;
    }) {
        this.version = version || {};
    }
@ -90,33 +83,6 @@ export class Version {
        return `{ "isPHD": true, "versionId": "${versionId}" }`;
    }

-    /**
-     * Appends a key-value pair to a JSON object represented as a string. It adds
-     * a comma if the object is not empty (i.e., not just '{}'). It assumes the input
-     * string is formatted as a JSON object.
-     *
-     * @param {string} stringifiedObject The JSON object as a string to which the key-value pair will be appended.
-     * @param {string} key The key to append to the JSON object.
-     * @param {string} value The value associated with the key to append to the JSON object.
-     * @returns {string} The updated JSON object as a string with the new key-value pair appended.
-     * @example
-     * _jsonAppend('{"existingKey":"existingValue"}', 'newKey', 'newValue');
-     * // returns '{"existingKey":"existingValue","newKey":"newValue"}'
-     */
-    static _jsonAppend(stringifiedObject: string, key: string, value: string): string {
-        // stringifiedObject value has the format of '{...}'
-        let index = stringifiedObject.length - 2;
-        while (stringifiedObject.charAt(index) === ' ') {
-            index -= 1;
-        }
-        const needComma = stringifiedObject.charAt(index) !== '{';
-        return (
-            `${stringifiedObject.slice(0, stringifiedObject.length - 1)}` +
-            (needComma ? ',' : '') +
-            `"${key}":"${value}"}`
-        );
-    }
-
    /**
     * Put versionId into an object in the (cheap) way of string manipulation,
     * instead of the more expensive alternative parsing and stringification.
@ -127,32 +93,14 @@ export class Version {
     */
    static appendVersionId(value: string, versionId: string): string {
        // assuming value has the format of '{...}'
-        return Version._jsonAppend(value, 'versionId', versionId);
-    }
-
-    /**
-    * Updates or appends a `nullVersionId` property to a JSON-formatted string.
-    * This function first checks if the `nullVersionId` property already exists within the input string.
-    * If it exists, the function updates the `nullVersionId` with the new value provided.
-    * If it does not exist, the function appends a `nullVersionId` property with the provided value.
-    *
-    * @static
-    * @param {string} value - The JSON-formatted string that may already contain a `nullVersionId` property.
-    * @param {string} nullVersionId - The new value for the `nullVersionId` property to be updated or appended.
-    * @returns {string} The updated JSON-formatted string with the new `nullVersionId` value.
-    */
-    static updateOrAppendNullVersionId(value: string, nullVersionId: string): string {
-        // Check if "nullVersionId" already exists in the string
-        const nullVersionIdPattern = /"nullVersionId":"[^"]*"/;
-        const nullVersionIdExists = nullVersionIdPattern.test(value);
-    
-        if (nullVersionIdExists) {
-            // Replace the existing nullVersionId with the new one
-            return value.replace(nullVersionIdPattern, `"nullVersionId":"${nullVersionId}"`);
-        } else {
-            // Append nullVersionId
-            return Version._jsonAppend(value, 'nullVersionId', nullVersionId);
-        }
+        let index = value.length - 2;
+        while (value.charAt(index--) === ' ');
+        const comma = value.charAt(index + 1) !== '{';
+        return (
+            `${value.slice(0, value.length - 1)}` + // eslint-disable-line
+            (comma ? ',' : '') +
+            `"versionId":"${versionId}"}`
+        );
    }

    /**
@ -173,19 +121,6 @@ export class Version {
        return this.version.isNull ?? false;
    }

-    /**
-     * Check if a version is a null version and has
-     * been put with a Cloudserver handling null keys (i.e. supporting
-     * S3C-7352).
-     *
-     * @return - stating if the value is a null version and has
-     * been put with a Cloudserver handling null keys (i.e. supporting
-     * S3C-7352).
-     */
-    isNull2Version(): boolean {
-        return this.version.isNull2 ?? false;
-    }
-
    /**
     * Check if a stringified object is a delete marker.
     *
@ -255,19 +190,6 @@ export class Version {
        return this;
    }

-    /**
-     * Mark that the null version has been put with a Cloudserver handling null keys (i.e. supporting S3C-7352)
-     * 
-     * If `isNull2` is set, `isNull` is also set to maintain consistency.
-     * Explicitly setting both avoids misunderstandings and mistakes in future updates or fixes.
-     * @return - the updated version
-     */
-    setNull2Version() {
-        this.version.isNull2 = true;
-        this.version.isNull = true;
-        return this;
-    }
-
    /**
     * Serialize the version.
     *
--- a/lib/versioning/VersioningRequestProcessor.ts
+++ b/lib/versioning/VersioningRequestProcessor.ts
@ -1,8 +1,6 @@
-import { RequestLogger } from 'werelogs';
-
 import errors, { ArsenalError } from '../errors';
 import { Version } from './Version';
-import { generateVersionId as genVID, getInfVid } from './VersionID';
+import { generateVersionId as genVID } from './VersionID';
 import WriteCache from './WriteCache';
 import WriteGatheringManager from './WriteGatheringManager';

@ -483,113 +481,19 @@ export default class VersioningRequestProcessor {
            const versionId = request.options.versionId;
            const versionKey = formatVersionKey(key, versionId);
            const ops: any = [];
-            const masterVersion = data !== undefined &&
-                  Version.from(data);
-            // push a version key if we're not updating the null
-            // version (or in legacy Cloudservers not sending the
-            // 'isNull' parameter, but this has an issue, see S3C-7526)
-            if (request.options.isNull !== true) {
-                const versionOp = { key: versionKey, value: request.value };
-                ops.push(versionOp);
+            if (!request.options.isNull) {
+                ops.push({ key: versionKey, value: request.value });
            }
-            if (masterVersion) {
-                // master key exists
-                // note that older versions have a greater version ID
-                const versionIdFromMaster = masterVersion.getVersionId();
-                if (versionIdFromMaster === undefined ||
-                    versionIdFromMaster >= versionId) {
-                    let value = request.value;
-                    logger.debug('version to put is not older than master');
-                    // Delete the deprecated, null key for backward compatibility
-                    // to avoid storing both deprecated and new null keys.
-                    // If master null version was put with an older Cloudserver (or in compat mode),
-                    // there is a possibility that it also has a null versioned key
-                    // associated, so we need to delete it as we write the null key.
-                    // Deprecated null key gets deleted when the new CloudServer:
-                    // - updates metadata of a null master (options.isNull=true)
-                    // - puts metadata on top of a master null key (options.isNull=false)
-                    if (request.options.isNull !== undefined && // new null key behavior when isNull is defined.
-                        masterVersion.isNullVersion() && // master is null
-                        !masterVersion.isNull2Version()) { // master does not support the new null key behavior yet.
-                        const masterNullVersionId = masterVersion.getVersionId();
-                        // The deprecated null key is referenced in the "versionId" property of the master key.
-                        if (masterNullVersionId) {
-                            const oldNullVersionKey = formatVersionKey(key, masterNullVersionId);
-                            ops.push({ key: oldNullVersionKey, type: 'del' });
-                        }
-                    }
-                    // new behavior when isNull is defined is to only
-                    // update the master key if it is the latest
-                    // version, old behavior needs to copy master to
-                    // the null version because older Cloudservers
-                    // rely on version-specific PUT to copy master
-                    // contents to a new null version key (newer ones
-                    // use special versionId="null" requests for this
-                    // purpose).
-                    if (versionIdFromMaster !== versionId ||
-                        request.options.isNull === undefined) {
-                        // master key is strictly older than the put version
-                        let masterVersionId;
-                        if (masterVersion.isNullVersion() && versionIdFromMaster) {
-                            logger.debug('master key is a null version');
-                            masterVersionId = versionIdFromMaster;
-                        } else if (versionIdFromMaster === undefined) {
-                            logger.debug('master key is nonversioned');
-                            // master key does not have a versionID
-                            // => create one with the "infinite" version ID
-                            masterVersionId = getInfVid(this.replicationGroupId);
-                            masterVersion.setVersionId(masterVersionId);
-                        } else {
-                            logger.debug('master key is a regular version');
-                        }
-                        if (request.options.isNull === true) {
-                            if (!masterVersionId) {
-                                // master is a regular version: delete the null key that
-                                // may exist (older null version)
-                                logger.debug('delete null key');
-                                const nullKey = formatVersionKey(key, '');
-                                ops.push({ key: nullKey, type: 'del' });
-                            }
-                        } else if (masterVersionId) {
-                            logger.debug('create version key from master version');
-                            // isNull === false means Cloudserver supports null keys,
-                            // so create a null key in this case, and a version key otherwise
-                            const masterKeyVersionId = request.options.isNull === false ?
-                                  '' : masterVersionId;
-                            const masterVersionKey = formatVersionKey(key, masterKeyVersionId);
-                            masterVersion.setNullVersion();
-                            // isNull === false means Cloudserver supports null keys,
-                            // so create a null key with the isNull2 flag
-                            if (request.options.isNull === false) {
-                                masterVersion.setNull2Version();
-                            // else isNull === undefined means Cloudserver does not support null keys,
-                            // and versionIdFromMaster !== versionId means that a version is PUT on top of a null version
-                            // hence set/update the new master nullVersionId for backward compatibility
-                            } else if (versionIdFromMaster !== versionId) {
-                                // => set the nullVersionId to the master version if put version on top of null version.
-                                value = Version.updateOrAppendNullVersionId(request.value, masterVersionId);
-                            }
-                            ops.push({ key: masterVersionKey,
-                                       value: masterVersion.toString() });
-                        }
-                    } else {
-                        logger.debug('version to put is the master');
-                    }
-                    ops.push({ key, value: value });
-                } else {
-                    logger.debug('version to put is older than master');
-                    if (request.options.isNull === true && !masterVersion.isNullVersion()) {
-                        logger.debug('create or update null key');
-                        const nullKey = formatVersionKey(key, '');
-                        const nullKeyOp = { key: nullKey, value: request.value };
-                        ops.push(nullKeyOp);
-                        // for backward compatibility: remove null version key
-                        ops.push({ key: versionKey, type: 'del' });
-                    }
-                }
-            } else {
-                // master key does not exist: create it
-                ops.push({ key, value: request.value });
+            if (data === undefined ||
+                (Version.from(data).getVersionId() ?? '') >= versionId) {
+                // master does not exist or is not newer than put
+                // version and needs to be updated as well.
+                // Note that older versions have a greater version ID.
+                ops.push({ key: request.key, value: request.value });
+            } else if (request.options.isNull) {
+                logger.debug('create or update null key');
+                const nullKey = formatVersionKey(key, '');
+                ops.push({ key: nullKey, value: request.value });
            }
            return callback(null, ops, versionId);
        });
--- a/lib/versioning/WriteCache.ts
+++ b/lib/versioning/WriteCache.ts
@ -1,5 +1,3 @@
-import { RequestLogger } from 'werelogs';
-
 import errors, { ArsenalError } from '../errors';
 import WriteGatheringManager from './WriteGatheringManager';

--- a/lib/versioning/WriteGatheringManager.ts
+++ b/lib/versioning/WriteGatheringManager.ts
@ -1,5 +1,3 @@
-import { RequestLogger } from 'werelogs';
-
 import { ArsenalError } from '../errors';

 const WG_TIMEOUT = 5; // batching period in milliseconds
--- a/package.json
+++ b/package.json
@ -3,7 +3,7 @@
  "engines": {
    "node": ">=16"
  },
-  "version": "8.1.134",
+  "version": "8.1.101",
  "description": "Common utilities for the S3 project components",
  "main": "build/index.js",
  "repository": {
@ -19,38 +19,39 @@
  "dependencies": {
    "@azure/identity": "^3.1.1",
    "@azure/storage-blob": "^12.12.0",
-    "@js-sdsl/ordered-set": "^4.4.2",
-    "@swc/cli": "^0.4.0",
-    "@swc/core": "^1.7.4",
+    "@types/async": "^3.2.12",
+    "@types/utf8": "^3.0.1",
+    "JSONStream": "^1.0.0",
    "agentkeepalive": "^4.1.3",
-    "ajv": "^6.12.3",
-    "async": "^2.6.4",
+    "ajv": "6.12.3",
+    "async": "~2.6.4",
    "aws-sdk": "^2.1005.0",
    "backo": "^1.1.0",
-    "base-x": "^3.0.8",
-    "base62": "^2.0.1",
-    "bson": "^4.0.0",
-    "debug": "^4.1.0",
+    "base-x": "3.0.8",
+    "base62": "2.0.1",
+    "bson": "4.0.0",
+    "debug": "~4.1.0",
    "diskusage": "^1.1.1",
-    "fcntl": "git+https://git.yourcmc.ru/vitalif/zenko-fcntl.git",
-    "httpagent": "git+https://git.yourcmc.ru/vitalif/zenko-httpagent.git#development/1.0",
+    "fcntl": "github:scality/node-fcntl#0.2.0",
+    "hdclient": "scality/hdclient#1.1.5",
+    "httpagent": "scality/httpagent#1.0.6",
    "https-proxy-agent": "^2.2.0",
    "ioredis": "^4.28.5",
-    "ipaddr.js": "^1.9.1",
+    "ipaddr.js": "1.9.1",
    "joi": "^17.6.0",
-    "JSONStream": "^1.0.0",
-    "level": "^5.0.1",
-    "level-sublevel": "^6.6.5",
+    "level": "~5.0.1",
+    "level-sublevel": "~6.6.5",
    "mongodb": "^5.2.0",
    "node-forge": "^1.3.0",
-    "prom-client": "^14.2.0",
+    "prom-client": "14.2.0",
    "simple-glob": "^0.2.0",
-    "socket.io": "^4.6.1",
-    "socket.io-client": "^4.6.1",
-    "utf8": "^3.0.0",
+    "socket.io": "~4.6.1",
+    "socket.io-client": "~4.6.1",
+    "sproxydclient": "git+https://github.com/scality/sproxydclient#8.0.9",
+    "utf8": "3.0.0",
    "uuid": "^3.0.1",
-    "werelogs": "git+https://git.yourcmc.ru/vitalif/zenko-werelogs.git#development/8.1",
-    "xml2js": "^0.4.23"
+    "werelogs": "scality/werelogs#8.1.2",
+    "xml2js": "~0.4.23"
  },
  "optionalDependencies": {
    "ioctl": "^2.0.2"
@ -59,24 +60,22 @@
    "@babel/preset-env": "^7.16.11",
    "@babel/preset-typescript": "^7.16.7",
    "@sinonjs/fake-timers": "^6.0.1",
-    "@types/async": "^3.2.12",
-    "@types/utf8": "^3.0.1",
    "@types/ioredis": "^4.28.10",
    "@types/jest": "^27.4.1",
-    "@types/node": "^18.19.41",
+    "@types/node": "^17.0.21",
    "@types/xml2js": "^0.4.11",
    "eslint": "^8.14.0",
-    "eslint-config-airbnb-base": "^15.0.0",
-    "eslint-config-scality": "git+https://git.yourcmc.ru/vitalif/zenko-eslint-config-scality.git",
+    "eslint-config-airbnb": "6.2.0",
+    "eslint-config-scality": "scality/Guidelines#ec33dfb",
    "eslint-plugin-react": "^4.3.0",
    "jest": "^27.5.1",
    "mongodb-memory-server": "^8.12.2",
    "nyc": "^15.1.0",
    "sinon": "^9.0.2",
-    "temp": "^0.9.1",
+    "temp": "0.9.1",
    "ts-jest": "^27.1.3",
    "ts-node": "^10.6.0",
-    "typescript": "^4.9.5"
+    "typescript": "^4.6.2"
  },
  "scripts": {
    "lint": "eslint $(git ls-files '*.js')",
@ -84,11 +83,10 @@
    "lint_yml": "yamllint $(git ls-files '*.yml')",
    "test": "jest tests/unit",
    "build": "tsc",
-    "prepack": "tsc",
-    "postinstall": "[ -d build ] || swc -d build --copy-files package.json index.ts lib",
+    "prepare": "yarn build",
    "ft_test": "jest tests/functional --testTimeout=120000 --forceExit",
    "coverage": "nyc --clean jest tests --coverage --testTimeout=120000 --forceExit",
-    "build_doc": "cd documentation/listingAlgos/pics; dot -Tsvg delimiterStateChart.dot > delimiterStateChart.svg; dot -Tsvg delimiterMasterV0StateChart.dot > delimiterMasterV0StateChart.svg; dot -Tsvg delimiterVersionsStateChart.dot > delimiterVersionsStateChart.svg"
+    "build_doc": "cd documentation/listingAlgos/pics; dot -Tsvg delimiterVersionsStateChart.dot > delimiterVersionsStateChart.svg"
  },
  "private": true,
  "jest": {
--- a/tests/functional/clustering/ClusterRPC-test-server.js
+++ b/tests/functional/clustering/ClusterRPC-test-server.js
@ -1,356 +0,0 @@
-const async = require('async');
-const assert = require('assert');
-const cluster = require('cluster');
-const http = require('http');
-
-const errors = require('../../../build/lib/errors').default;
-
-const {
-    setupRPCPrimary,
-    setupRPCWorker,
-    sendWorkerCommand,
-    getPendingCommandsCount,
-} = require('../../../build/lib/clustering/ClusterRPC');
-
-/* eslint-disable prefer-const */
-let SERVER_PORT;
-let N_WORKERS;
-/* eslint-enable prefer-const */
-
-/* eslint-disable no-console */
-
-function genUIDS() {
-    return Math.trunc(Math.random() * 0x10000).toString(16);
-}
-
-// for testing robustness: regularly pollute the message channel with
-// unrelated IPC messages
-function sendPollutionMessage(message) {
-    if (cluster.isPrimary) {
-        const randomWorker = Math.trunc(Math.random() * cluster.workers.length);
-        const worker = cluster.workers[randomWorker];
-        if (worker) {
-            worker.send(message);
-        }
-    } else {
-        process.send(message);
-    }
-}
-const ipcPolluterIntervals = [
-    setInterval(
-        () => sendPollutionMessage('string pollution'), 1500),
-    setInterval(
-        () => sendPollutionMessage({ pollution: 'bar' }), 2321),
-    setInterval(
-        () => sendPollutionMessage({ type: 'pollution', foo: { bar: 'baz' } }), 2777),
-];
-
-function someTestHandlerFunc(payload, uids, callback) {
-    setTimeout(() => callback(null, { someResponsePayload: 'bar' }), 10);
-}
-
-function testHandlerWithFailureFunc(payload, uids, callback) {
-    setTimeout(() => {
-        // exactly one of the workers fails to execute this command
-        if (cluster.worker.id === 1) {
-            callback(errors.ServiceFailure);
-        } else {
-            callback(null, { someResponsePayload: 'bar' });
-        }
-    }, 10);
-}
-
-const rpcHandlers = {
-    SomeTestHandler: someTestHandlerFunc,
-    TestHandlerWithFailure: testHandlerWithFailureFunc,
-    TestHandlerWithNoResponse: () => {},
-};
-
-const primaryHandlers = {
-    echoHandler: (worker, payload, uids, callback) => {
-        callback(null, { workerId: worker.id, payload, uids });
-    },
-    errorWithHttpCodeHandler: (_worker, _payload, _uids, callback) => {
-        callback({ name: 'ErrorMock', code: 418, message: 'An error message from primary' });
-    },
-};
-
-function respondOnTestFailure(message, error, results) {
-    console.error('After sendWorkerCommand() resolve/reject: ' +
-                  `${message}, error=${error}, results=${JSON.stringify(results)}`);
-    console.trace();
-    throw errors.InternalError;
-}
-
-async function successfulCommandTestGeneric(nWorkers) {
-    try {
-        const results = await sendWorkerCommand('*', 'SomeTestHandler', genUIDS(), {});
-        if (results.length !== nWorkers) {
-            return respondOnTestFailure(
-                `expected ${nWorkers} worker results, got ${results.length}`,
-                null, results);
-        }
-        for (const result of results) {
-            if (typeof result !== 'object' || result === null) {
-                return respondOnTestFailure('not all results are objects', null, results);
-            }
-            if (result.error !== null) {
-                return respondOnTestFailure(
-                    'one or more workers had an unexpected error',
-                    null, results);
-            }
-            if (typeof result.result !== 'object' || result.result === null) {
-                return respondOnTestFailure(
-                    'one or more workers did not return a result object',
-                    null, results);
-            }
-            if (result.result.someResponsePayload !== 'bar') {
-                return respondOnTestFailure(
-                    'one or more workers did not return the expected payload',
-                    null, results);
-            }
-        }
-        return undefined;
-    } catch (err) {
-        return respondOnTestFailure(`returned unexpected error ${err}`, err, null);
-    }
-}
-
-async function successfulCommandTest() {
-    return successfulCommandTestGeneric(N_WORKERS);
-}
-
-async function successfulCommandWithExtraWorkerTest() {
-    return successfulCommandTestGeneric(N_WORKERS + 1);
-}
-
-async function unsupportedToWorkersTest() {
-    try {
-        const results = await sendWorkerCommand('badToWorkers', 'SomeTestHandler', genUIDS(), {});
-        return respondOnTestFailure('expected an error', null, results);
-    } catch (err) {
-        if (!err.is.NotImplemented) {
-            return respondOnTestFailure('expected a NotImplemented error', err, null);
-        }
-        return undefined;
-    }
-}
-
-async function unsupportedHandlerTest() {
-    try {
-        const results = await sendWorkerCommand('*', 'AWrongTestHandler', genUIDS(), {});
-        if (results.length !== N_WORKERS) {
-            return respondOnTestFailure(
-                `expected ${N_WORKERS} worker results, got ${results.length}`,
-                null, results);
-        }
-        for (const result of results) {
-            if (typeof result !== 'object' || result === null) {
-                return respondOnTestFailure('not all results are objects', null, results);
-            }
-            if (result.error === null || !result.error.is.NotImplemented) {
-                return respondOnTestFailure(
-                    'one or more workers did not return the expected NotImplemented error',
-                    null, results);
-            }
-        }
-        return undefined;
-    } catch (err) {
-        return respondOnTestFailure(`returned unexpected error ${err}`, err, null);
-    }
-}
-
-async function missingUidsTest() {
-    try {
-        const results = await sendWorkerCommand('*', 'SomeTestHandler', undefined, {});
-        return respondOnTestFailure('expected an error', null, results);
-    } catch (err) {
-        if (!err.is.MissingParameter) {
-            return respondOnTestFailure('expected a MissingParameter error', err, null);
-        }
-        return undefined;
-    }
-}
-
-async function duplicateUidsTest() {
-    const dupUIDS = genUIDS();
-    const promises = [
-        sendWorkerCommand('*', 'SomeTestHandler', dupUIDS, {}),
-        sendWorkerCommand('*', 'SomeTestHandler', dupUIDS, {}),
-    ];
-    const results = await Promise.allSettled(promises);
-    if (results[1].status !== 'rejected') {
-        return respondOnTestFailure('expected an error from the second call', null, null);
-    }
-    if (!results[1].reason.is.OperationAborted) {
-        return respondOnTestFailure(
-            'expected a OperationAborted error', results[1].reason, null);
-    }
-    return undefined;
-}
-
-async function unsuccessfulWorkerTest() {
-    try {
-        const results = await sendWorkerCommand('*', 'TestHandlerWithFailure', genUIDS(), {});
-        if (results.length !== N_WORKERS) {
-            return respondOnTestFailure(
-                `expected ${N_WORKERS} worker results, got ${results.length}`,
-                null, results);
-        }
-        const nServiceFailures = results.filter(result => (
-            result.error && result.error.is.ServiceFailure
-        )).length;
-        if (nServiceFailures !== 1) {
-            return respondOnTestFailure(
-                'expected exactly one worker result to be ServiceFailure error',
-                null, results);
-        }
-        return undefined;
-    } catch (err) {
-        return respondOnTestFailure(`returned unexpected error ${err}`, err, null);
-    }
-}
-
-async function workerTimeoutTest() {
-    try {
-        const results = await sendWorkerCommand(
-            '*', 'TestHandlerWithNoResponse', genUIDS(), {}, 1000);
-        return respondOnTestFailure('expected an error', null, results);
-    } catch (err) {
-        if (!err.is.RequestTimeout) {
-            return respondOnTestFailure('expected a RequestTimeout error', err, null);
-        }
-        return undefined;
-    }
-}
-
-async function workerToPrimaryEcho() {
-    const uids = genUIDS();
-    const payload = { testing: true };
-    const expected = { workerId: cluster.worker.id, payload, uids };
-
-    const results = await sendWorkerCommand('PRIMARY', 'echoHandler', uids, payload);
-    assert.strictEqual(results.length, 1, 'There is 1 and only 1 primary');
-    assert.ifError(results[0].error);
-    assert.deepStrictEqual(results[0].result, expected);
-}
-
-async function workerToPrimaryErrorWithHttpCode() {
-    const uids = genUIDS();
-    const payload = { testing: true };
-    const results = await sendWorkerCommand('PRIMARY', 'errorWithHttpCodeHandler', uids, payload);
-    assert.strictEqual(results.length, 1, 'There is 1 and only 1 primary');
-    assert.ok(results[0].error);
-    assert.strictEqual(results[0].error.message, 'An error message from primary');
-    assert.strictEqual(results[0].error.code, 418);
-}
-
-const TEST_URLS = {
-    '/successful-command': successfulCommandTest,
-    '/successful-command-with-extra-worker': successfulCommandWithExtraWorkerTest,
-    '/unsupported-to-workers': unsupportedToWorkersTest,
-    '/unsupported-handler': unsupportedHandlerTest,
-    '/missing-uids': missingUidsTest,
-    '/duplicate-uids': duplicateUidsTest,
-    '/unsuccessful-worker': unsuccessfulWorkerTest,
-    '/worker-timeout': workerTimeoutTest,
-    '/worker-to-primary/echo': workerToPrimaryEcho,
-    '/worker-to-primary/error-with-http-code': workerToPrimaryErrorWithHttpCode,
-};
-
-if (process.argv.length !== 4) {
-    console.error('ClusterRPC test server: GET requests on test URLs trigger test runs\n\n' +
-                  'Usage: node ClusterRPC-test-server.js <port> <nb-workers>\n\n' +
-                  'Available test URLs:');
-    console.error(`${Object.keys(TEST_URLS).map(url => `- ${url}\n`).join('')}`);
-    process.exit(2);
-}
-
-/* eslint-disable prefer-const */
-[
-    SERVER_PORT,
-    N_WORKERS,
-] = process.argv.slice(2, 4).map(value => Number.parseInt(value, 10));
-/* eslint-enable prefer-const */
-
-let server;
-
-if (cluster.isPrimary) {
-    async.timesSeries(
-        N_WORKERS,
-        (i, wcb) => cluster.fork().on('online', wcb),
-        () => {
-            setupRPCPrimary(primaryHandlers);
-        },
-    );
-} else {
-    // in worker
-    server = http.createServer((req, res) => {
-        if (req.url in TEST_URLS) {
-            return TEST_URLS[req.url]().then(() => {
-                if (getPendingCommandsCount() !== 0) {
-                    console.error(`There are still ${getPendingCommandsCount()} pending ` +
-                                  `RPC commands after test ${req.url} completed`);
-                    throw errors.InternalError;
-                }
-                res.writeHead(200);
-                res.end();
-            }).catch(err => {
-                // serialize AssertionError to be displayed nicely in jest
-                if (err instanceof assert.AssertionError) {
-                    const serializedErr = JSON.stringify({
-                        code: err.code,
-                        message: err.message,
-                        stack: err.stack,
-                        actual: err.actual,
-                        expected: err.expected,
-                        operator: err.operator,
-                    });
-                    res.writeHead(500);
-                    res.end(serializedErr);
-                } else {
-                    res.writeHead(err.code || 500);
-                    res.end(err.message);
-                }
-            });
-        }
-        console.error(`Invalid test URL ${req.url}`);
-        res.writeHead(400);
-        res.end();
-        return undefined;
-    });
-    server.listen(SERVER_PORT);
-    server.on('listening', () => {
-        console.log('Worker is listening');
-    });
-
-    setupRPCWorker(rpcHandlers);
-}
-
-function stop(signal) {
-    if (cluster.isPrimary) {
-        console.log(`Handling signal ${signal}`);
-        for (const worker of Object.values(cluster.workers)) {
-            worker.kill(signal);
-            worker.on('exit', () => {
-                console.log(`Worker ${worker.id} exited`);
-            });
-        }
-    }
-    for (const interval of ipcPolluterIntervals) {
-        clearInterval(interval);
-    }
-}
-
-process.on('SIGTERM', stop);
-process.on('SIGINT', stop);
-process.on('SIGPIPE', () => {});
-
-// for testing: spawn a new worker each time SIGUSR1 is received
-function spawnNewWorker() {
-    if (cluster.isPrimary) {
-        cluster.fork();
-    }
-}
-
-process.on('SIGUSR1', spawnNewWorker);
--- a/tests/functional/clustering/ClusterRPC.spec.js
+++ b/tests/functional/clustering/ClusterRPC.spec.js
@ -1,151 +0,0 @@
-'use strict'; // eslint-disable-line
-const assert = require('assert');
-const http = require('http');
-const readline = require('readline');
-const spawn = require('child_process').spawn;
-
-const TEST_SERVER_PORT = 8800;
-const NB_WORKERS = 4;
-
-let testServer = null;
-
-/*
- * jest tests don't correctly support cluster mode with child forked
- * processes, instead we use an external test server that launches
- * each test based on the provided URL, and returns either 200 for
- * success or 500 for failure. A crash would also cause a failure
- * from the client side.
- */
-function startTestServer(done) {
-    testServer = spawn('node', [
-        `${__dirname}/ClusterRPC-test-server.js`,
-        TEST_SERVER_PORT,
-        NB_WORKERS,
-    ]);
-    // gather server stderr to display test failures info
-    testServer.stdout.pipe(process.stdout);
-    testServer.stderr.pipe(process.stderr);
-
-    const rl = readline.createInterface({
-        input: testServer.stdout,
-    });
-    let nbListeningWorkers = 0;
-    rl.on('line', line => {
-        if (line === 'Worker is listening') {
-            nbListeningWorkers++;
-            if (nbListeningWorkers === NB_WORKERS) {
-                rl.close();
-                done();
-            }
-        }
-    });
-}
-
-function stopTestServer(done) {
-    testServer.kill('SIGTERM');
-    testServer.on('close', done);
-}
-
-/**
- * Try to deserialize and recreate AssertionError with stackTrace from spawned server
- * @param {string} responseBody maybe serialized AssertionError
- * @throws {assert.AssertionError}
- * @returns {undefined}
- */
-function handleAssertionError(responseBody) {
-    let parsed;
-    try {
-        parsed = JSON.parse(responseBody);
-    } catch (_) {
-        return;
-    }
-
-    if (parsed && parsed.code === 'ERR_ASSERTION') {
-        const err = new assert.AssertionError(parsed);
-        err.stack = parsed.stack;
-        throw err;
-    }
-}
-
-function runTest(testUrl, cb) {
-    const req = http.request(`http://localhost:${TEST_SERVER_PORT}/${testUrl}`, res => {
-        let responseBody = '';
-        res
-            .on('data', (chunk) => {
-                responseBody += chunk;
-            })
-            .on('end', () => {
-                try {
-                    handleAssertionError(responseBody);
-                    expect(res.statusCode).toEqual(200);
-                } catch (err) {
-                    if (!(err instanceof assert.AssertionError)) {
-                        err.message += `\n\nBody:\n${responseBody}`;
-                    }
-                    return cb(err);
-                }
-                return cb();
-            })
-            .on('error', err => cb(err));
-    });
-    req
-        .end()
-        .on('error', err => cb(err));
-}
-
-describe('ClusterRPC', () => {
-    beforeAll(done => startTestServer(done));
-    afterAll(done => stopTestServer(done));
-
-    it('should send a successful command to all workers', done => {
-        runTest('successful-command', done);
-    });
-
-    it('should error if "toWorkers" field is not "*"', done => {
-        runTest('unsupported-to-workers', done);
-    });
-
-    it('should error if handler name is not known', done => {
-        runTest('unsupported-handler', done);
-    });
-
-    it('should error if "uids" field is not passed', done => {
-        runTest('missing-uids', done);
-    });
-
-    it('should error if two simultaneous commands with same "uids" field are sent', done => {
-        runTest('duplicate-uids', done);
-    });
-
-    it('should timeout if one or more workers don\'t respond in allocated time', done => {
-        runTest('worker-timeout', done);
-    });
-
-    it('should return worker errors in results array', done => {
-        runTest('unsuccessful-worker', done);
-    });
-
-    it('should send a successful command to all workers after an extra worker is spawned', done => {
-        const rl = readline.createInterface({
-            input: testServer.stdout,
-        });
-        rl.on('line', line => {
-            if (line === 'Worker is listening') {
-                rl.close();
-                runTest('successful-command-with-extra-worker', done);
-            }
-        });
-        // The test server spawns a new worker when it receives SIGUSR1
-        testServer.kill('SIGUSR1');
-    });
-
-    describe('worker to primary', () => {
-        it('should succeed and return a result', done => {
-            runTest('worker-to-primary/echo', done);
-        });
-
-        it('should return an error with a code', done => {
-            runTest('worker-to-primary/error-with-http-code', done);
-        });
-    });
-});
--- a/tests/functional/metadata/mongodb/delObject.spec.js
+++ b/tests/functional/metadata/mongodb/delObject.spec.js
@ -454,48 +454,6 @@ describe('MongoClientInterface::metadata.deleteObjectMD', () => {
                    },
                ], done);
            });
-
-            it('should delete the object directly if params.doesNotNeedOpogUpdate is true', done => {
-                const objName = 'object-to-delete';
-                const objVal = {
-                    key: 'object-to-delete',
-                    versionId: 'null',
-                };
-                const versionParams = {
-                    versioning: false,
-                    versionId: null,
-                    repairMaster: null,
-                };
-                async.series([
-                    next => {
-                        metadata.putObjectMD(BUCKET_NAME, objName, objVal, versionParams, logger, next);
-                    },
-                    next => {
-                        metadata.deleteObjectMD(BUCKET_NAME, objName, { doesNotNeedOpogUpdate: true }, logger, next);
-                    },
-                    next => {
-                        metadata.getObjectMD(BUCKET_NAME, objName, null, logger, err => {
-                            assert.deepStrictEqual(err, errors.NoSuchKey);
-                            return next();
-                        });
-                    },
-                    next => {
-                        getObjectCount((err, count) => {
-                            assert.deepStrictEqual(err, null);
-                            assert.strictEqual(count, 0);
-                            return next();
-                        });
-                    },
-                ], done);
-            });
-
-            it('should throw an error if params.doesNotNeedOpogUpdate is true and object does not exist', done => {
-                const objName = 'non-existent-object';
-                metadata.deleteObjectMD(BUCKET_NAME, objName, { doesNotNeedOpogUpdate: true }, logger, err => {
-                    assert.deepStrictEqual(err, errors.InternalError);
-                    return done();
-                });
-            });
        });
    });
 });
--- a/tests/functional/metadata/mongodb/getObjects.spec.js
+++ b/tests/functional/metadata/mongodb/getObjects.spec.js
@ -1,331 +0,0 @@
-const async = require('async');
-const assert = require('assert');
-const werelogs = require('werelogs');
-const { MongoMemoryReplSet } = require('mongodb-memory-server');
-const { versioning } = require('../../../../index');
-const logger = new werelogs.Logger('MongoClientInterface', 'debug', 'debug');
-const BucketInfo = require('../../../../lib/models/BucketInfo').default;
-const MetadataWrapper =
-    require('../../../../lib/storage/metadata/MetadataWrapper');
-const genVID = versioning.VersionID.generateVersionId;
-const { BucketVersioningKeyFormat } = versioning.VersioningConstants;
-const { formatMasterKey, formatVersionKey } = require('../../../../lib/storage/metadata/mongoclient/utils');
-
-const IMPL_NAME = 'mongodb';
-const DB_NAME = 'metadata';
-const BUCKET_NAME = 'test-bucket-batching';
-const replicationGroupId = 'RG001';
-const N = 10;
-
-const mongoserver = new MongoMemoryReplSet({
-    debug: false,
-    instanceOpts: [
-        { port: 27019 },
-    ],
-    replSet: {
-        name: 'rs0',
-        count: 1,
-        DB_NAME,
-        storageEngine: 'ephemeralForTest',
-    },
-});
-
-let uidCounter = 0;
-function generateVersionId() {
-    return genVID(`${process.pid}.${uidCounter++}`,
-        replicationGroupId);
-}
-
-const variations = [
-    { it: '(v0)', vFormat: BucketVersioningKeyFormat.v0, versioning: false },
-    { it: '(v0)', vFormat: BucketVersioningKeyFormat.v0, versioning: true },
-    { it: '(v1)', vFormat: BucketVersioningKeyFormat.v1, versioning: false },
-    { it: '(v1)', vFormat: BucketVersioningKeyFormat.v1, versioning: true },
-];
-
-describe('MongoClientInterface::metadata.getObjectsMD', () => {
-    let metadata;
-    let collection;
-    let versionId2;
-
-    const params = {
-        key: 'pfx1-test-object',
-        objVal: {
-            key: 'pfx1-test-object',
-            versionId: 'null',
-        },
-    };
-
-    function updateMasterObject(objName, versionId, objVal, vFormat, cb) {
-        const mKey = formatMasterKey(objName, vFormat);
-        collection.updateOne(
-            {
-                _id: mKey,
-                $or: [{
-                    'value.versionId': {
-                        $exists: false,
-                    },
-                },
-                {
-                    'value.versionId': {
-                        $gt: versionId,
-                    },
-                },
-                ],
-            },
-            {
-                $set: { _id: mKey, value: objVal },
-            },
-            { upsert: true }).then(() => cb(null)).catch(err => cb(err));
-    }
-
-    /**
-     * Sets the "deleted" property to true
-     * @param {string} key object name
-     * @param {Function} cb callback
-     * @return {undefined}
-     */
-    function flagObjectForDeletion(key, cb) {
-        collection.updateMany(
-            { 'value.key': key },
-            { $set: { 'value.deleted': true } },
-            { upsert: false }).then(() => cb()).catch(err => cb(err));
-    }
-
-    beforeAll(done => {
-        mongoserver.start().then(() => {
-            mongoserver.waitUntilRunning().then(() => {
-                const opts = {
-                    mongodb: {
-                        replicaSetHosts: 'localhost:27019',
-                        writeConcern: 'majority',
-                        replicaSet: 'rs0',
-                        readPreference: 'primary',
-                        database: DB_NAME,
-                    },
-                };
-                metadata = new MetadataWrapper(IMPL_NAME, opts, null, logger);
-                metadata.setup(done);
-            });
-        });
-    });
-
-    afterAll(done => {
-        async.series([
-            next => metadata.close(next),
-            next => mongoserver.stop()
-                .then(() => next())
-                .catch(next),
-        ], done);
-    });
-
-    variations.forEach(variation => {
-        const itOnlyInV1 = variation.vFormat === 'v1' && variation.versioning ? it : it.skip;
-        describe(`vFormat : ${variation.vFormat}, versioning: ${variation.versioning}`, () => {
-            let paramsArr = [];
-
-            beforeEach(done => {
-                // reset params
-                paramsArr = Array.from({ length: N }, (_, i) => ({
-                    key: `pfx1-test-object${i + 1}`,
-                    objVal: {
-                        key: `pfx1-test-object${i + 1}`,
-                        versionId: 'null',
-                    },
-                }));
-                const bucketMD = BucketInfo.fromObj({
-                    _name: BUCKET_NAME,
-                    _owner: 'testowner',
-                    _ownerDisplayName: 'testdisplayname',
-                    _creationDate: new Date().toJSON(),
-                    _acl: {
-                        Canned: 'private',
-                        FULL_CONTROL: [],
-                        WRITE: [],
-                        WRITE_ACP: [],
-                        READ: [],
-                        READ_ACP: [],
-                    },
-                    _mdBucketModelVersion: 10,
-                    _transient: false,
-                    _deleted: false,
-                    _serverSideEncryption: null,
-                    _versioningConfiguration: null,
-                    _locationConstraint: 'us-east-1',
-                    _readLocationConstraint: null,
-                    _cors: null,
-                    _replicationConfiguration: null,
-                    _lifecycleConfiguration: null,
-                    _uid: '',
-                    _isNFS: null,
-                    ingestion: null,
-                });
-                const versionParams = {
-                    versioning: variation.versioning,
-                    versionId: null,
-                    repairMaster: null,
-                };
-                async.series([
-                    next => {
-                        metadata.client.defaultBucketKeyFormat = variation.vFormat;
-                        return next();
-                    },
-                    next => metadata.createBucket(BUCKET_NAME, bucketMD, logger, err => {
-                        if (err) {
-                            return next(err);
-                        }
-                        collection = metadata.client.getCollection(BUCKET_NAME);
-                        return next();
-                    }),
-                    next => {
-                        async.eachSeries(paramsArr, (params, eachCb) => {
-                            metadata.putObjectMD(BUCKET_NAME, params.key, params.objVal,
-                                versionParams, logger, (err, res) => {
-                                    if (err) {
-                                        return eachCb(err);
-                                    }
-                                    if (variation.versioning) {
-                                        // eslint-disable-next-line no-param-reassign
-                                        params.versionId = JSON.parse(res).versionId;
-                                    }
-                                    return eachCb(null);
-                                });
-                        }, next);
-                    },
-                    next => {
-                        metadata.putObjectMD(BUCKET_NAME, paramsArr[N - 1].key, paramsArr[N - 1].objVal,
-                            versionParams, logger, (err, res) => {
-                                if (err) {
-                                    return next(err);
-                                }
-                                if (variation.versioning) {
-                                    versionId2 = JSON.parse(res).versionId;
-                                } else {
-                                    versionId2 = 'null';
-                                }
-                                return next(null);
-                            });
-                    },
-                ], done);
-            });
-
-            afterEach(done => {
-                metadata.deleteBucket(BUCKET_NAME, logger, done);
-            });
-
-            it(`should get ${N} objects${variation.versioning ? '' : ' master'} versions using batching`, done => {
-                const request = paramsArr.map(({ key, objVal }) => ({
-                    key,
-                    params: {
-                        versionId: variation.versioning ? objVal.versionId : null,
-                    },
-                }));
-                metadata.getObjectsMD(BUCKET_NAME, request, logger, (err, objects) => {
-                    assert.strictEqual(err, null);
-                    assert.strictEqual(objects.length, N);
-                    objects.forEach((obj, i) => {
-                        assert.strictEqual(obj.doc.key, paramsArr[i].key);
-                        if (variation.versioning) {
-                            assert.strictEqual(obj.doc.versionId, paramsArr[i].objVal.versionId);
-                        }
-                    });
-                    return done();
-                });
-            });
-
-            it('should not throw an error if object or version is inexistent and return null doc', done => {
-                const request = [{
-                    key: 'nonexistent',
-                    params: {
-                        versionId: variation.versioning ? 'nonexistent' : null,
-                    },
-                }];
-                metadata.getObjectsMD(BUCKET_NAME, request, logger, (err, objects) => {
-                    assert.strictEqual(err, null);
-                    assert.strictEqual(objects.length, 1);
-                    assert.strictEqual(objects[0].doc, null);
-                    done();
-                });
-            });
-
-            it(`should return latest version when master is PHD ${variation.it}`, done => {
-                if (!variation.versioning) {
-                    return done();
-                }
-                const request = paramsArr.map(({ key, objVal }) => ({
-                    key,
-                    params: {
-                        versionId: variation.versioning ? objVal.versionId : null,
-                    },
-                }));
-                return async.series([
-                    next => {
-                        let objectName = null;
-                        if (variations.versioning) {
-                            objectName =
-                                formatVersionKey(paramsArr[N - 1].key, paramsArr[N - 1].versionId, variation.vFormat);
-                        } else {
-                            objectName = formatMasterKey(paramsArr[N - 1].key, variation.vFormat);
-                        }
-                        // adding isPHD flag to master
-                        const phdVersionId = generateVersionId();
-                        paramsArr[N - 1].objVal.versionId = phdVersionId;
-                        paramsArr[N - 1].objVal.isPHD = true;
-                        updateMasterObject(objectName, phdVersionId, paramsArr[N - 1].objVal,
-                            variation.vFormat, next);
-                    },
-                    // Should return latest object version
-                    next => metadata.getObjectsMD(BUCKET_NAME, request, logger, (err, objects) => {
-                        assert.deepStrictEqual(err, null);
-                        objects.forEach((obj, i) => {
-                            assert.strictEqual(obj.doc.key, paramsArr[i].objVal.key);
-                            if (variation.versioning && i === N - 1) {
-                                assert.strictEqual(obj.doc.versionId, versionId2);
-                            } else {
-                                assert.strictEqual(obj.doc.versionId, paramsArr[i].objVal.versionId);
-                            }
-                        });
-                        delete params.isPHD;
-                        return next();
-                    }),
-                ], done);
-            });
-
-            it('should fail to get an object tagged for deletion', done => {
-                const key = paramsArr[0].key;
-                flagObjectForDeletion(key, err => {
-                    assert(err);
-                    metadata.getObjectsMD(BUCKET_NAME, [{ key }], logger, (err, object) => {
-                        assert.strictEqual(err, null);
-                        assert.strictEqual(object[0].doc, null);
-                        done();
-                    });
-                });
-            });
-
-            itOnlyInV1(`Should return last version when master deleted ${variation.vFormat}`, done => {
-                const versioningParams = {
-                    versioning: true,
-                    versionId: null,
-                    repairMaster: null,
-                };
-                async.series([
-                    // putting a delete marker as last version
-                    next => {
-                        paramsArr[0].versionId = null;
-                        paramsArr[0].objVal.isDeleteMarker = true;
-                        return metadata.putObjectMD(BUCKET_NAME, paramsArr[0].key, paramsArr[0].objVal,
-                            versioningParams, logger, next);
-                    },
-                    next => metadata.getObjectsMD(BUCKET_NAME, [{ key: paramsArr[0].key }], logger, (err, objects) => {
-                        assert.strictEqual(err, null);
-                        assert.strictEqual(objects[0].doc.key, paramsArr[0].key);
-                        assert.strictEqual(objects[0].doc.isDeleteMarker, true);
-                        paramsArr[0].objVal.isDeleteMarker = null;
-                        return next();
-                    }),
-                ], done);
-            });
-        });
-    });
-});
--- a/tests/functional/metadata/mongodb/listLifecycleObject/current.spec.js
+++ b/tests/functional/metadata/mongodb/listLifecycleObject/current.spec.js
--- a/tests/functional/metadata/mongodb/listLifecycleObject/global.spec.js
+++ b/tests/functional/metadata/mongodb/listLifecycleObject/global.spec.js
@ -0,0 +1,104 @@
+const async = require('async');
+const assert = require('assert');
+const werelogs = require('werelogs');
+const { MongoMemoryReplSet } = require('mongodb-memory-server');
+const logger = new werelogs.Logger('MongoClientInterface', 'debug', 'debug');
+const MetadataWrapper =
+    require('../../../../../lib/storage/metadata/MetadataWrapper');
+const { versioning } = require('../../../../../index');
+const { BucketVersioningKeyFormat } = versioning.VersioningConstants;
+const { makeBucketMD } = require('./utils');
+
+const IMPL_NAME = 'mongodb';
+const DB_NAME = 'metadata';
+const BUCKET_NAME = 'test-lifecycle-list-bucket-v0';
+
+const mongoserver = new MongoMemoryReplSet({
+    debug: false,
+    instanceOpts: [
+        { port: 27020 },
+    ],
+    replSet: {
+        name: 'rs0',
+        count: 1,
+        DB_NAME,
+        storageEngine: 'ephemeralForTest',
+    },
+});
+
+describe('MongoClientInterface::metadata.listLifecycleObject::global', () => {
+    let metadata;
+
+    beforeAll(done => {
+        mongoserver.start().then(() => {
+            mongoserver.waitUntilRunning().then(() => {
+                const opts = {
+                    mongodb: {
+                        replicaSetHosts: 'localhost:27020',
+                        writeConcern: 'majority',
+                        replicaSet: 'rs0',
+                        readPreference: 'primary',
+                        database: DB_NAME,
+                    },
+                };
+                metadata = new MetadataWrapper(IMPL_NAME, opts, null, logger);
+                metadata.client.defaultBucketKeyFormat = BucketVersioningKeyFormat.v0;
+                metadata.setup(done);
+            });
+        });
+    });
+
+    afterAll(done => {
+        async.series([
+            next => metadata.close(next),
+            next => mongoserver.stop()
+                .then(() => next())
+                .catch(next),
+        ], done);
+    });
+
+    beforeEach(done => {
+        const bucketMD = makeBucketMD(BUCKET_NAME);
+        return metadata.createBucket(BUCKET_NAME, bucketMD, logger, done);
+    });
+
+    afterEach(done => {
+        metadata.deleteBucket(BUCKET_NAME, logger, done);
+    });
+
+    it('Should return error listing current versions if v0 key format', done => {
+        const params = {
+            listingType: 'DelimiterCurrent',
+        };
+        return metadata.listLifecycleObject(BUCKET_NAME, params, logger, (err, data) => {
+            assert(err.NotImplemented);
+            assert(!data);
+
+            return done();
+        });
+    });
+
+    it('Should return error listing non-current versions if v0 key format', done => {
+        const params = {
+            listingType: 'DelimiterNonCurrent',
+        };
+        return metadata.listLifecycleObject(BUCKET_NAME, params, logger, (err, data) => {
+            assert(err.NotImplemented);
+            assert(!data);
+
+            return done();
+        });
+    });
+
+    it('Should return error listing orphan delete markers if v0 key format', done => {
+        const params = {
+            listingType: 'DelimiterOrphanDeleteMarker',
+        };
+        return metadata.listLifecycleObject(BUCKET_NAME, params, logger, (err, data) => {
+            assert(err.NotImplemented);
+            assert(!data);
+
+            return done();
+        });
+    });
+});
--- a/tests/functional/metadata/mongodb/listLifecycleObject/noncurrent.spec.js
+++ b/tests/functional/metadata/mongodb/listLifecycleObject/noncurrent.spec.js
--- a/tests/functional/metadata/mongodb/listLifecycleObject/nullVersion.spec.js
+++ b/tests/functional/metadata/mongodb/listLifecycleObject/nullVersion.spec.js
@ -43,6 +43,7 @@ describe('MongoClientInterface::metadata.listLifecycleObject::nullVersion', () =
                    },
                };
                metadata = new MetadataWrapper(IMPL_NAME, opts, null, logger);
+                metadata.client.defaultBucketKeyFormat = BucketVersioningKeyFormat.v1;
                metadata.setup(done);
            });
        });
@ -57,159 +58,96 @@ describe('MongoClientInterface::metadata.listLifecycleObject::nullVersion', () =
        ], done);
    });

-    [BucketVersioningKeyFormat.v0, BucketVersioningKeyFormat.v1].forEach(v => {
-        describe(`bucket format version: ${v}`, () => {
-            beforeEach(done => {
-                const bucketMD = makeBucketMD(BUCKET_NAME);
-                const versionParams = {
-                    versioning: true,
-                    versionId: null,
-                    repairMaster: null,
+    beforeEach(done => {
+        const bucketMD = makeBucketMD(BUCKET_NAME);
+        const versionParams = {
+            versioning: true,
+            versionId: null,
+            repairMaster: null,
+        };
+        async.series([
+            next => metadata.createBucket(BUCKET_NAME, bucketMD, logger, next),
+            next => {
+                const objName = 'key0';
+                const timestamp = 0;
+
+                const lastModified = new Date(timestamp).toISOString();
+                const objVal = {
+                    'key': objName,
+                    'versionId': 'null',
+                    'isNull': true,
+                    'last-modified': lastModified,
                };
-                metadata.client.defaultBucketKeyFormat = v;
-                async.series([
-                    next => metadata.createBucket(BUCKET_NAME, bucketMD, logger, next),
-                    next => {
-                        const objName = 'key0';
-                        const timestamp = 0;
+                return metadata.putObjectMD(BUCKET_NAME, objName, objVal, versionParams, logger, next);
+            },
+            next => {
+                const objName = 'key1';
+                const timestamp = 0;

-                        const lastModified = new Date(timestamp).toISOString();
-                        const objVal = {
-                            'key': objName,
-                            'versionId': 'null',
-                            'isNull': true,
-                            'last-modified': lastModified,
-                        };
-                        return metadata.putObjectMD(BUCKET_NAME, objName, objVal, versionParams, logger, next);
-                    },
-                    next => {
-                        const objName = 'key1';
-                        const timestamp = 0;
-
-                        const lastModified = new Date(timestamp).toISOString();
-                        const objVal = {
-                            'key': objName,
-                            'versionId': 'null',
-                            'isNull': true,
-                            'last-modified': lastModified,
-                        };
-                        return metadata.putObjectMD(BUCKET_NAME, objName, objVal, versionParams, logger, next);
-                    },
-                    next => {
-                        const objName = 'key1';
-                        const timestamp = 0;
-
-                        const lastModified = new Date(timestamp).toISOString();
-                        const objVal = {
-                            'key': objName,
-                            'last-modified': lastModified,
-                        };
-                        return metadata.putObjectMD(BUCKET_NAME, objName, objVal, versionParams, logger, next);
-                    },
-                    // key2 simulates a scenario where:
-                    // 1) bucket is versioned
-                    // 2) put object key2
-                    // 3) bucket versioning gets suspended
-                    // 4) put object key2
-                    // result:
-                    // {
-                    //     "_id" : "Mkey0",
-                    //     "value" : {
-                    //         "key" : "key2",
-                    //         "isNull" : true,
-                    //         "versionId" : "<VersionId2>",
-                    //         "last-modified" : "2023-07-11T14:16:00.151Z",
-                    //     }
-                    // },
-                    // {
-                    //     "_id" : "Vkey0\u0000<VersionId1>",
-                    //     "value" : {
-                    //         "key" : "key2",
-                    //         "versionId" : "<VersionId1>",
-                    //         "tags" : {
-                    //         },
-                    //         "last-modified" : "2023-07-11T14:15:36.713Z",
-                    //     }
-                    // },
-                    next => {
-                        const objName = 'key2';
-                        const timestamp = 0;
-
-                        const lastModified = new Date(timestamp).toISOString();
-                        const objVal = {
-                            'key': objName,
-                            'last-modified': lastModified,
-                        };
-                        return metadata.putObjectMD(BUCKET_NAME, objName, objVal, versionParams, logger, next);
-                    },
-                    next => {
-                        const objName = 'key2';
-                        const timestamp = 0;
-                        const params = {
-                            versionId: '',
-                        };
-
-                        const lastModified = new Date(timestamp).toISOString();
-                        const objVal = {
-                            'key': objName,
-                            'last-modified': lastModified,
-                            'isNull': true,
-                        };
-                        return metadata.putObjectMD(BUCKET_NAME, objName, objVal, params, logger, next);
-                    },
-                ], done);
-            });
-
-            afterEach(done => metadata.deleteBucket(BUCKET_NAME, logger, done));
-
-            it('Should list the null current version and set IsNull to true', done => {
-                const params = {
-                    listingType: 'DelimiterCurrent',
+                const lastModified = new Date(timestamp).toISOString();
+                const objVal = {
+                    'key': objName,
+                    'versionId': 'null',
+                    'isNull': true,
+                    'last-modified': lastModified,
                };
-                return metadata.listLifecycleObject(BUCKET_NAME, params, logger, (err, data) => {
-                    assert.ifError(err);
-                    assert.strictEqual(data.IsTruncated, false);
-                    assert.strictEqual(data.Contents.length, 3);
+                return metadata.putObjectMD(BUCKET_NAME, objName, objVal, versionParams, logger, next);
+            },
+            next => {
+                const objName = 'key1';
+                const timestamp = 0;

-                    // check that key0 has a null current version
-                    const firstKey = data.Contents[0];
-                    assert.strictEqual(firstKey.key, 'key0');
-                    assert.strictEqual(firstKey.value.IsNull, true);
-
-                    // check that key1 has no null current version
-                    const secondKey = data.Contents[1];
-                    assert.strictEqual(secondKey.key, 'key1');
-                    assert(!secondKey.value.IsNull);
-
-                    // check that key2 has a null current version
-                    const thirdKey = data.Contents[2];
-                    assert.strictEqual(thirdKey.key, 'key2');
-                    assert.strictEqual(thirdKey.value.IsNull, true);
-                    return done();
-                });
-            });
-
-            it('Should list the null non-current version and set IsNull to true', done => {
-                const params = {
-                    listingType: 'DelimiterNonCurrent',
+                const lastModified = new Date(timestamp).toISOString();
+                const objVal = {
+                    'key': objName,
+                    'versionId': 'null',
+                    'last-modified': lastModified,
                };
-                return metadata.listLifecycleObject(BUCKET_NAME, params, logger, (err, data) => {
-                    assert.deepStrictEqual(err, null);
-                    assert.strictEqual(data.IsTruncated, false);
-                    assert.strictEqual(data.Contents.length, 2);
+                return metadata.putObjectMD(BUCKET_NAME, objName, objVal, versionParams, logger, next);
+            },
+        ], done);
+    });

-                    // check that key1 has a null non-current version
-                    const firstKey = data.Contents[0];
-                    assert.strictEqual(firstKey.key, 'key1');
-                    assert.strictEqual(firstKey.value.IsNull, true);
+    afterEach(done => {
+        metadata.deleteBucket(BUCKET_NAME, logger, done);
+    });

-                    // check that key2 has no null non-current version
-                    const secondKey = data.Contents[1];
-                    assert.strictEqual(secondKey.key, 'key2');
-                    assert(!secondKey.value.IsNull);
-                    return done();
-                });
-            });
+    it('Should list the null current version and set IsNull to true', done => {
+        const params = {
+            listingType: 'DelimiterCurrent',
+        };
+        return metadata.listLifecycleObject(BUCKET_NAME, params, logger, (err, data) => {
+            assert.ifError(err);
+            assert.strictEqual(data.IsTruncated, false);
+            assert.strictEqual(data.Contents.length, 2);
+
+            // check that key0 has a null current version
+            const firstKey = data.Contents[0];
+            assert.strictEqual(firstKey.key, 'key0');
+            assert.strictEqual(firstKey.value.IsNull, true);
+
+            // check that key1 has not a null current version
+            const secondKey = data.Contents[1];
+            assert.strictEqual(secondKey.key, 'key1');
+            assert(!secondKey.value.IsNull);
+            return done();
+        });
+    });
+
+    it('Should list the null non-current version and set IsNull to true', done => {
+        const params = {
+            listingType: 'DelimiterNonCurrent',
+        };
+        return metadata.listLifecycleObject(BUCKET_NAME, params, logger, (err, data) => {
+            assert.deepStrictEqual(err, null);
+            assert.strictEqual(data.IsTruncated, false);
+            assert.strictEqual(data.Contents.length, 1);
+
+            // check that key1 has a null non-current version
+            const firstKey = data.Contents[0];
+            assert.strictEqual(firstKey.key, 'key1');
+            assert.strictEqual(firstKey.value.IsNull, true);
+            return done();
        });
    });
 });
--- a/tests/functional/metadata/mongodb/listLifecycleObject/orphanDeleteMarker.spec.js
+++ b/tests/functional/metadata/mongodb/listLifecycleObject/orphanDeleteMarker.spec.js
@ -42,6 +42,7 @@ describe('MongoClientInterface::metadata.listLifecycleObject::orphan', () => {
                    },
                };
                metadata = new MetadataWrapper(IMPL_NAME, opts, null, logger);
+                metadata.client.defaultBucketKeyFormat = BucketVersioningKeyFormat.v1;
                metadata.setup(done);
            });
        });
@ -56,400 +57,392 @@ describe('MongoClientInterface::metadata.listLifecycleObject::orphan', () => {
        ], done);
    });

-    [BucketVersioningKeyFormat.v0, BucketVersioningKeyFormat.v1].forEach(v => {
-        describe(`bucket format version: ${v}`, () => {
-            beforeEach(done => {
-                const bucketMD = makeBucketMD(BUCKET_NAME);
-                const versionParams = {
+    beforeEach(done => {
+        const bucketMD = makeBucketMD(BUCKET_NAME);
+        const versionParams = {
+            versioning: true,
+            versionId: null,
+            repairMaster: null,
+        };
+        async.series([
+            next => metadata.createBucket(BUCKET_NAME, bucketMD, logger, next),
+            next => {
+                const keyName = 'pfx0-test-object';
+
+                const objVal = {
+                    'key': keyName,
+                    'isDeleteMarker': true,
+                    'last-modified': new Date(0).toISOString(), // 1970-01-01T00:00:00.000Z
+                };
+                const params = {
                    versioning: true,
-                    versionId: null,
-                    repairMaster: null,
                };
-                metadata.client.defaultBucketKeyFormat = v;
-                async.series([
-                    next => metadata.createBucket(BUCKET_NAME, bucketMD, logger, next),
-                    next => {
-                        const keyName = 'pfx0-test-object';
-
-                        const objVal = {
-                            'key': keyName,
-                            'isDeleteMarker': true,
-                            'last-modified': new Date(0).toISOString(), // 1970-01-01T00:00:00.000Z
-                        };
-                        const params = {
-                            versioning: true,
-                        };
-                        return metadata.putObjectMD(BUCKET_NAME, keyName, objVal, params, logger, next);
+                return metadata.putObjectMD(BUCKET_NAME, keyName, objVal, params, logger, next);
+            },
+            next => {
+                const params = {
+                    objName: 'pfx1-test-object',
+                    objVal: {
+                        key: 'pfx1-test-object',
+                        versionId: 'null',
                    },
-                    next => {
-                        const params = {
-                            objName: 'pfx1-test-object',
-                            objVal: {
-                                key: 'pfx1-test-object',
-                                versionId: 'null',
-                            },
-                            nbVersions: 1,
-                        };
-                        const timestamp = 0;
-                        putBulkObjectVersions(metadata, BUCKET_NAME, params.objName, params.objVal, versionParams,
-                            params.nbVersions, timestamp, logger, next);
+                    nbVersions: 1,
+                };
+                const timestamp = 0;
+                putBulkObjectVersions(metadata, BUCKET_NAME, params.objName, params.objVal, versionParams,
+                    params.nbVersions, timestamp, logger, next);
+            },
+            next => {
+                const params = {
+                    objName: 'pfx2-test-object',
+                    objVal: {
+                        key: 'pfx2-test-object',
+                        versionId: 'null',
                    },
-                    next => {
-                        const params = {
-                            objName: 'pfx2-test-object',
-                            objVal: {
-                                key: 'pfx2-test-object',
-                                versionId: 'null',
-                            },
-                            nbVersions: 1,
-                        };
-                        const timestamp = 0;
-                        putBulkObjectVersions(metadata, BUCKET_NAME, params.objName, params.objVal, versionParams,
-                            params.nbVersions, timestamp, logger, next);
-                    },
-                    next => {
-                        const keyName = 'pfx2-test-object';
-
-                        const objVal = {
-                            'key': keyName,
-                            'isDeleteMarker': true,
-                            'last-modified': new Date(2).toISOString(), // 1970-01-01T00:00:00.002Z
-                        };
-                        const params = {
-                            versioning: true,
-                        };
-                        return metadata.putObjectMD(BUCKET_NAME, keyName, objVal, params, logger, next);
-                    },
-                    next => {
-                        const keyName = 'pfx3-test-object';
-
-                        const objVal = {
-                            'key': keyName,
-                            'isDeleteMarker': true,
-                            'last-modified': new Date(0).toISOString(), // 1970-01-01T00:00:00.000Z
-                        };
-                        const params = {
-                            versioning: true,
-                        };
-                        return metadata.putObjectMD(BUCKET_NAME, keyName, objVal, params, logger, next);
-                    },
-                    next => {
-                        const keyName = 'pfx4-test-object';
-
-                        const objVal = {
-                            'key': keyName,
-                            'isDeleteMarker': true,
-                            'last-modified': new Date(5).toISOString(), // 1970-01-01T00:00:00.005Z
-                        };
-                        const params = {
-                            versioning: true,
-                        };
-                        return metadata.putObjectMD(BUCKET_NAME, keyName, objVal, params, logger, next);
-                    },
-                    next => {
-                        const keyName = 'pfx4-test-object2';
-
-                        const objVal = {
-                            'key': keyName,
-                            'isDeleteMarker': true,
-                            'last-modified': new Date(6).toISOString(), // 1970-01-01T00:00:00.006Z
-                        };
-                        const params = {
-                            versioning: true,
-                        };
-                        return metadata.putObjectMD(BUCKET_NAME, keyName, objVal, params, logger, next);
-                    },
-                ], done);
-            });
-            /* eslint-disable max-len */
-            // { "_id" : "Mpfx1-test-object", "value" : { "key" : "pfx1-test-object", "versionId" : "v1", "last-modified" : "1970-01-01T00:00:00.001Z" } }
-            // { "_id" : "Vpfx0-test-object{sep}v0", "value" : { "key" : "pfx0-test-object", "isDeleteMarker" : true, "last-modified" : "1970-01-01T00:00:00.000Z", "versionId" : "v0" } }
-            // { "_id" : "Vpfx1-test-object{sep}v1", "value" : { "key" : "pfx1-test-object", "versionId" : "v1", "last-modified" : "1970-01-01T00:00:00.001Z" } }
-            // { "_id" : "Vpfx2-test-object{sep}v3", "value" : { "key" : "pfx2-test-object", "isDeleteMarker" : true, "last-modified" : "1970-01-01T00:00:00.002Z", "versionId" : "v3" } }
-            // { "_id" : "Vpfx2-test-object{sep}v2", "value" : { "key" : "pfx2-test-object", "versionId" : "v2", "last-modified" : "1970-01-01T00:00:00.001Z" } }
-            // { "_id" : "Vpfx3-test-object{sep}v4", "value" : { "key" : "pfx3-test-object", "isDeleteMarker" : true, "last-modified" : "1970-01-01T00:00:00.000Z", "versionId" : "v4" } }
-            // { "_id" : "Vpfx4-test-object{sep}v5", "value" : { "key" : "pfx4-test-object", "isDeleteMarker" : true, "last-modified" : "1970-01-01T00:00:00.005Z", "versionId" : "v5" } }
-            // { "_id" : "Vpfx4-test-object2{sep}v6", "value" : { "key" : "pfx4-test-object", "isDeleteMarker" : true, "last-modified" : "1970-01-01T00:00:00.006Z", "versionId" : "v6" } }
-            /* eslint-enable max-len */
-
-            afterEach(done => {
-                metadata.deleteBucket(BUCKET_NAME, logger, done);
-            });
-
-            it('Should list orphan delete markers', done => {
-                const params = {
-                    listingType: 'DelimiterOrphanDeleteMarker',
+                    nbVersions: 1,
                };
-                return metadata.listLifecycleObject(BUCKET_NAME, params, logger, (err, data) => {
-                    assert.deepStrictEqual(err, null);
-                    assert.strictEqual(data.IsTruncated, false);
-                    assert(!data.NextMarker);
-                    assert.strictEqual(data.Contents.length, 4);
-                    assert.strictEqual(data.Contents[0].key, 'pfx0-test-object');
-                    assert.strictEqual(data.Contents[1].key, 'pfx3-test-object');
-                    assert.strictEqual(data.Contents[2].key, 'pfx4-test-object');
-                    assert.strictEqual(data.Contents[3].key, 'pfx4-test-object2');
-                    return done();
-                });
-            });
+                const timestamp = 0;
+                putBulkObjectVersions(metadata, BUCKET_NAME, params.objName, params.objVal, versionParams,
+                    params.nbVersions, timestamp, logger, next);
+            },
+            next => {
+                const keyName = 'pfx2-test-object';

-            it('Should return empty list when beforeDate is before youngest last-modified', done => {
-                const params = {
-                    listingType: 'DelimiterOrphanDeleteMarker',
-                    beforeDate: '1970-01-01T00:00:00.000Z',
+                const objVal = {
+                    'key': keyName,
+                    'isDeleteMarker': true,
+                    'last-modified': new Date(2).toISOString(), // 1970-01-01T00:00:00.002Z
                };
-                return metadata.listLifecycleObject(BUCKET_NAME, params, logger, (err, data) => {
-                    assert.deepStrictEqual(err, null);
-                    assert.strictEqual(data.IsTruncated, false);
-                    assert(!data.NextMarker);
-                    assert.strictEqual(data.Contents.length, 0);
-
-                    return done();
-                });
-            });
-
-            it('Should list orphan delete markers older than 1970-01-01T00:00:00.003Z', done => {
                const params = {
-                    listingType: 'DelimiterOrphanDeleteMarker',
-                    beforeDate: '1970-01-01T00:00:00.003Z',
+                    versioning: true,
                };
-                return metadata.listLifecycleObject(BUCKET_NAME, params, logger, (err, data) => {
-                    assert.deepStrictEqual(err, null);
-                    assert.strictEqual(data.IsTruncated, false);
-                    assert(!data.NextMarker);
-                    assert.strictEqual(data.Contents.length, 2);
-                    assert.strictEqual(data.Contents[0].key, 'pfx0-test-object');
-                    assert.strictEqual(data.Contents[1].key, 'pfx3-test-object');
+                return metadata.putObjectMD(BUCKET_NAME, keyName, objVal, params, logger, next);
+            },
+            next => {
+                const keyName = 'pfx3-test-object';

-                    return done();
-                });
-            });
-
-            it('Should return the first part of the orphan delete markers listing', done => {
+                const objVal = {
+                    'key': keyName,
+                    'isDeleteMarker': true,
+                    'last-modified': new Date(0).toISOString(), // 1970-01-01T00:00:00.000Z
+                };
                const params = {
-                    listingType: 'DelimiterOrphanDeleteMarker',
-                    maxKeys: 1,
+                    versioning: true,
                };
-                return metadata.listLifecycleObject(BUCKET_NAME, params, logger, (err, data) => {
-                    assert.deepStrictEqual(err, null);
-                    assert.strictEqual(data.IsTruncated, true);
-                    assert.strictEqual(data.NextMarker, 'pfx0-test-object');
-                    assert.strictEqual(data.Contents.length, 1);
-                    assert.strictEqual(data.Contents[0].key, 'pfx0-test-object');
+                return metadata.putObjectMD(BUCKET_NAME, keyName, objVal, params, logger, next);
+            },
+            next => {
+                const keyName = 'pfx4-test-object';

-                    return done();
-                });
-            });
-
-            it('Should return the second part of the orphan delete markers listing', done => {
+                const objVal = {
+                    'key': keyName,
+                    'isDeleteMarker': true,
+                    'last-modified': new Date(5).toISOString(), // 1970-01-01T00:00:00.005Z
+                };
                const params = {
-                    listingType: 'DelimiterOrphanDeleteMarker',
-                    marker: 'pfx0-test-object',
-                    maxKeys: 1,
+                    versioning: true,
                };
-                return metadata.listLifecycleObject(BUCKET_NAME, params, logger, (err, data) => {
-                    assert.deepStrictEqual(err, null);
-                    assert.strictEqual(data.IsTruncated, true);
-                    assert.strictEqual(data.NextMarker, 'pfx3-test-object');
-                    assert.strictEqual(data.Contents.length, 1);
-                    assert.strictEqual(data.Contents[0].key, 'pfx3-test-object');
+                return metadata.putObjectMD(BUCKET_NAME, keyName, objVal, params, logger, next);
+            },
+            next => {
+                const keyName = 'pfx4-test-object2';

-                    return done();
-                });
-            });
-
-            it('Should return the third part of the orphan delete markers listing', done => {
+                const objVal = {
+                    'key': keyName,
+                    'isDeleteMarker': true,
+                    'last-modified': new Date(6).toISOString(), // 1970-01-01T00:00:00.006Z
+                };
                const params = {
-                    listingType: 'DelimiterOrphanDeleteMarker',
-                    marker: 'pfx3-test-object',
-                    maxKeys: 1,
+                    versioning: true,
                };
-                return metadata.listLifecycleObject(BUCKET_NAME, params, logger, (err, data) => {
-                    assert.deepStrictEqual(err, null);
-                    assert.strictEqual(data.IsTruncated, true);
-                    assert.strictEqual(data.NextMarker, 'pfx4-test-object');
-                    assert.strictEqual(data.Contents.length, 1);
-                    assert.strictEqual(data.Contents[0].key, 'pfx4-test-object');
+                return metadata.putObjectMD(BUCKET_NAME, keyName, objVal, params, logger, next);
+            },
+        ], done);
+    });
+    /* eslint-disable max-len */
+    // { "_id" : "Mpfx1-test-object", "value" : { "key" : "pfx1-test-object", "versionId" : "v1", "last-modified" : "1970-01-01T00:00:00.001Z" } }
+    // { "_id" : "Vpfx0-test-object{sep}v0", "value" : { "key" : "pfx0-test-object", "isDeleteMarker" : true, "last-modified" : "1970-01-01T00:00:00.000Z", "versionId" : "v0" } }
+    // { "_id" : "Vpfx1-test-object{sep}v1", "value" : { "key" : "pfx1-test-object", "versionId" : "v1", "last-modified" : "1970-01-01T00:00:00.001Z" } }
+    // { "_id" : "Vpfx2-test-object{sep}v3", "value" : { "key" : "pfx2-test-object", "isDeleteMarker" : true, "last-modified" : "1970-01-01T00:00:00.002Z", "versionId" : "v3" } }
+    // { "_id" : "Vpfx2-test-object{sep}v2", "value" : { "key" : "pfx2-test-object", "versionId" : "v2", "last-modified" : "1970-01-01T00:00:00.001Z" } }
+    // { "_id" : "Vpfx3-test-object{sep}v4", "value" : { "key" : "pfx3-test-object", "isDeleteMarker" : true, "last-modified" : "1970-01-01T00:00:00.000Z", "versionId" : "v4" } }
+    // { "_id" : "Vpfx4-test-object{sep}v5", "value" : { "key" : "pfx4-test-object", "isDeleteMarker" : true, "last-modified" : "1970-01-01T00:00:00.005Z", "versionId" : "v5" } }
+    // { "_id" : "Vpfx4-test-object2{sep}v6", "value" : { "key" : "pfx4-test-object", "isDeleteMarker" : true, "last-modified" : "1970-01-01T00:00:00.006Z", "versionId" : "v6" } }
+    /* eslint-enable max-len */

-                    return done();
-                });
-            });
+    afterEach(done => {
+        metadata.deleteBucket(BUCKET_NAME, logger, done);
+    });

-            it('Should return the fourth part of the orphan delete markers listing', done => {
-                const params = {
-                    listingType: 'DelimiterOrphanDeleteMarker',
-                    marker: 'pfx4-test-object',
-                    maxKeys: 1,
-                };
-                return metadata.listLifecycleObject(BUCKET_NAME, params, logger, (err, data) => {
-                    assert.deepStrictEqual(err, null);
-                    assert.strictEqual(data.IsTruncated, false);
-                    assert(!data.NextMarker);
-                    assert.strictEqual(data.Contents.length, 1);
-                    assert.strictEqual(data.Contents[0].key, 'pfx4-test-object2');
+    it('Should list orphan delete markers', done => {
+        const params = {
+            listingType: 'DelimiterOrphanDeleteMarker',
+        };
+        return metadata.listLifecycleObject(BUCKET_NAME, params, logger, (err, data) => {
+            assert.deepStrictEqual(err, null);
+            assert.strictEqual(data.IsTruncated, false);
+            assert(!data.NextMarker);
+            assert.strictEqual(data.Contents.length, 4);
+            assert.strictEqual(data.Contents[0].key, 'pfx0-test-object');
+            assert.strictEqual(data.Contents[1].key, 'pfx3-test-object');
+            assert.strictEqual(data.Contents[2].key, 'pfx4-test-object');
+            assert.strictEqual(data.Contents[3].key, 'pfx4-test-object2');
+            return done();
+        });
+    });

-                    return done();
-                });
-            });
+    it('Should return empty list when beforeDate is before youngest last-modified', done => {
+        const params = {
+            listingType: 'DelimiterOrphanDeleteMarker',
+            beforeDate: '1970-01-01T00:00:00.000Z',
+        };
+        return metadata.listLifecycleObject(BUCKET_NAME, params, logger, (err, data) => {
+            assert.deepStrictEqual(err, null);
+            assert.strictEqual(data.IsTruncated, false);
+            assert(!data.NextMarker);
+            assert.strictEqual(data.Contents.length, 0);

-            it('Should list the two first orphan delete markers', done => {
-                const params = {
-                    listingType: 'DelimiterOrphanDeleteMarker',
-                    maxKeys: 2,
-                };
-                return metadata.listLifecycleObject(BUCKET_NAME, params, logger, (err, data) => {
-                    assert.deepStrictEqual(err, null);
-                    assert.strictEqual(data.IsTruncated, true);
-                    assert.strictEqual(data.Contents.length, 2);
-                    assert.strictEqual(data.NextMarker, 'pfx3-test-object');
-                    assert.strictEqual(data.Contents[0].key, 'pfx0-test-object');
-                    assert.strictEqual(data.Contents[1].key, 'pfx3-test-object');
+            return done();
+        });
+    });

-                    return done();
-                });
-            });
+    it('Should list orphan delete markers older than 1970-01-01T00:00:00.003Z', done => {
+        const params = {
+            listingType: 'DelimiterOrphanDeleteMarker',
+            beforeDate: '1970-01-01T00:00:00.003Z',
+        };
+        return metadata.listLifecycleObject(BUCKET_NAME, params, logger, (err, data) => {
+            assert.deepStrictEqual(err, null);
+            assert.strictEqual(data.IsTruncated, false);
+            assert(!data.NextMarker);
+            assert.strictEqual(data.Contents.length, 2);
+            assert.strictEqual(data.Contents[0].key, 'pfx0-test-object');
+            assert.strictEqual(data.Contents[1].key, 'pfx3-test-object');

-            it('Should list the four first orphan delete markers', done => {
-                const params = {
-                    listingType: 'DelimiterOrphanDeleteMarker',
-                    maxKeys: 4,
-                };
-                return metadata.listLifecycleObject(BUCKET_NAME, params, logger, (err, data) => {
-                    assert.deepStrictEqual(err, null);
-                    assert.strictEqual(data.IsTruncated, false);
-                    assert(!data.NextMarker);
-                    assert.strictEqual(data.Contents.length, 4);
-                    assert.strictEqual(data.Contents[0].key, 'pfx0-test-object');
-                    assert.strictEqual(data.Contents[1].key, 'pfx3-test-object');
-                    assert.strictEqual(data.Contents[2].key, 'pfx4-test-object');
-                    assert.strictEqual(data.Contents[3].key, 'pfx4-test-object2');
+            return done();
+        });
+    });

-                    return done();
-                });
-            });
+    it('Should return the first part of the orphan delete markers listing', done => {
+        const params = {
+            listingType: 'DelimiterOrphanDeleteMarker',
+            maxKeys: 1,
+        };
+        return metadata.listLifecycleObject(BUCKET_NAME, params, logger, (err, data) => {
+            assert.deepStrictEqual(err, null);
+            assert.strictEqual(data.IsTruncated, true);
+            assert.strictEqual(data.NextMarker, 'pfx0-test-object');
+            assert.strictEqual(data.Contents.length, 1);
+            assert.strictEqual(data.Contents[0].key, 'pfx0-test-object');

-            it('Should return an empty list if no orphan delete marker starts with prefix pfx2', done => {
-                const params = {
-                    listingType: 'DelimiterOrphanDeleteMarker',
-                    prefix: 'pfx2',
-                };
-                return metadata.listLifecycleObject(BUCKET_NAME, params, logger, (err, data) => {
-                    assert.deepStrictEqual(err, null);
-                    assert.strictEqual(data.IsTruncated, false);
-                    assert(!data.NextMarker);
-                    assert.strictEqual(data.Contents.length, 0);
+            return done();
+        });
+    });

-                    return done();
-                });
-            });
+    it('Should return the second part of the orphan delete markers listing', done => {
+        const params = {
+            listingType: 'DelimiterOrphanDeleteMarker',
+            marker: 'pfx0-test-object',
+            maxKeys: 1,
+        };
+        return metadata.listLifecycleObject(BUCKET_NAME, params, logger, (err, data) => {
+            assert.deepStrictEqual(err, null);
+            assert.strictEqual(data.IsTruncated, true);
+            assert.strictEqual(data.NextMarker, 'pfx3-test-object');
+            assert.strictEqual(data.Contents.length, 1);
+            assert.strictEqual(data.Contents[0].key, 'pfx3-test-object');

-            it('Should list orphan delete markers that start with prefix pfx4', done => {
-                const params = {
-                    listingType: 'DelimiterOrphanDeleteMarker',
-                    prefix: 'pfx4',
-                };
-                return metadata.listLifecycleObject(BUCKET_NAME, params, logger, (err, data) => {
-                    assert.deepStrictEqual(err, null);
-                    assert.strictEqual(data.IsTruncated, false);
-                    assert(!data.NextMarker);
-                    assert.strictEqual(data.Contents.length, 2);
-                    assert.strictEqual(data.Contents[0].key, 'pfx4-test-object');
-                    assert.strictEqual(data.Contents[1].key, 'pfx4-test-object2');
+            return done();
+        });
+    });

-                    return done();
-                });
-            });
+    it('Should return the third part of the orphan delete markers listing', done => {
+        const params = {
+            listingType: 'DelimiterOrphanDeleteMarker',
+            marker: 'pfx3-test-object',
+            maxKeys: 1,
+        };
+        return metadata.listLifecycleObject(BUCKET_NAME, params, logger, (err, data) => {
+            assert.deepStrictEqual(err, null);
+            assert.strictEqual(data.IsTruncated, true);
+            assert.strictEqual(data.NextMarker, 'pfx4-test-object');
+            assert.strictEqual(data.Contents.length, 1);
+            assert.strictEqual(data.Contents[0].key, 'pfx4-test-object');

-            it('Should return the first orphan delete marker version that starts with prefix', done => {
-                const params = {
-                    listingType: 'DelimiterOrphanDeleteMarker',
-                    prefix: 'pfx4',
-                    maxKeys: 1,
-                };
-                return metadata.listLifecycleObject(BUCKET_NAME, params, logger, (err, data) => {
-                    assert.deepStrictEqual(err, null);
-                    assert.strictEqual(data.IsTruncated, true);
-                    assert.strictEqual(data.Contents.length, 1);
-                    assert.strictEqual(data.NextMarker, 'pfx4-test-object');
-                    assert.strictEqual(data.Contents[0].key, 'pfx4-test-object');
+            return done();
+        });
+    });

-                    return done();
-                });
-            });
+    it('Should return the fourth part of the orphan delete markers listing', done => {
+        const params = {
+            listingType: 'DelimiterOrphanDeleteMarker',
+            marker: 'pfx4-test-object',
+            maxKeys: 1,
+        };
+        return metadata.listLifecycleObject(BUCKET_NAME, params, logger, (err, data) => {
+            assert.deepStrictEqual(err, null);
+            assert.strictEqual(data.IsTruncated, false);
+            assert(!data.NextMarker);
+            assert.strictEqual(data.Contents.length, 1);
+            assert.strictEqual(data.Contents[0].key, 'pfx4-test-object2');

-            it('Should return the following orphan delete marker version that starts with prefix', done => {
-                const params = {
-                    listingType: 'DelimiterOrphanDeleteMarker',
-                    marker: 'pfx4-test-object',
-                    prefix: 'pfx4',
-                    maxKeys: 1,
-                };
-                return metadata.listLifecycleObject(BUCKET_NAME, params, logger, (err, data) => {
-                    assert.deepStrictEqual(err, null);
-                    assert.strictEqual(data.IsTruncated, false);
-                    assert(!data.NextMarker);
-                    assert.strictEqual(data.Contents.length, 1);
-                    assert.strictEqual(data.Contents[0].key, 'pfx4-test-object2');
+            return done();
+        });
+    });

-                    return done();
-                });
-            });
+    it('Should list the two first orphan delete markers', done => {
+        const params = {
+            listingType: 'DelimiterOrphanDeleteMarker',
+            maxKeys: 2,
+        };
+        return metadata.listLifecycleObject(BUCKET_NAME, params, logger, (err, data) => {
+            assert.deepStrictEqual(err, null);
+            assert.strictEqual(data.IsTruncated, true);
+            assert.strictEqual(data.Contents.length, 2);
+            assert.strictEqual(data.NextMarker, 'pfx3-test-object');
+            assert.strictEqual(data.Contents[0].key, 'pfx0-test-object');
+            assert.strictEqual(data.Contents[1].key, 'pfx3-test-object');

-            it('Should return the truncated list of orphan delete markers older than 1970-01-01T00:00:00.006Z',
-                done => {
-                    const params = {
-                        listingType: 'DelimiterOrphanDeleteMarker',
-                        maxKeys: 2,
-                        beforeDate: '1970-01-01T00:00:00.006Z',
-                    };
-                    return metadata.listLifecycleObject(BUCKET_NAME, params, logger, (err, data) => {
-                        assert.deepStrictEqual(err, null);
-                        assert.strictEqual(data.IsTruncated, true);
-                        assert.strictEqual(data.Contents.length, 2);
-                        assert.strictEqual(data.Contents[0].key, 'pfx0-test-object');
-                        assert.strictEqual(data.Contents[1].key, 'pfx3-test-object');
-                        assert.strictEqual(data.NextMarker, 'pfx3-test-object');
+            return done();
+        });
+    });

-                        return done();
-                    });
-                });
+    it('Should list the four first orphan delete markers', done => {
+        const params = {
+            listingType: 'DelimiterOrphanDeleteMarker',
+            maxKeys: 4,
+        };
+        return metadata.listLifecycleObject(BUCKET_NAME, params, logger, (err, data) => {
+            assert.deepStrictEqual(err, null);
+            assert.strictEqual(data.IsTruncated, false);
+            assert(!data.NextMarker);
+            assert.strictEqual(data.Contents.length, 4);
+            assert.strictEqual(data.Contents[0].key, 'pfx0-test-object');
+            assert.strictEqual(data.Contents[1].key, 'pfx3-test-object');
+            assert.strictEqual(data.Contents[2].key, 'pfx4-test-object');
+            assert.strictEqual(data.Contents[3].key, 'pfx4-test-object2');

-            it('Should return the following list of orphan delete markers older than 1970-01-01T00:00:00.006Z',
-                done => {
-                    const params = {
-                        listingType: 'DelimiterOrphanDeleteMarker',
-                        maxKeys: 2,
-                        beforeDate: '1970-01-01T00:00:00.006Z',
-                        marker: 'pfx3-test-object',
-                    };
-                    return metadata.listLifecycleObject(BUCKET_NAME, params, logger, (err, data) => {
-                        assert.deepStrictEqual(err, null);
-                        assert.strictEqual(data.IsTruncated, false);
-                        assert.strictEqual(data.Contents.length, 1);
-                        assert.strictEqual(data.Contents[0].key, 'pfx4-test-object');
+            return done();
+        });
+    });

-                        return done();
-                    });
-                });
+    it('Should return an empty list if no orphan delete marker starts with prefix pfx2', done => {
+        const params = {
+            listingType: 'DelimiterOrphanDeleteMarker',
+            prefix: 'pfx2',
+        };
+        return metadata.listLifecycleObject(BUCKET_NAME, params, logger, (err, data) => {
+            assert.deepStrictEqual(err, null);
+            assert.strictEqual(data.IsTruncated, false);
+            assert(!data.NextMarker);
+            assert.strictEqual(data.Contents.length, 0);

-            it('Should return the truncated list of orphan delete markers older than 1970-01-01T00:00:00.001Z',
-                done => {
-                    const params = {
-                        listingType: 'DelimiterOrphanDeleteMarker',
-                        maxKeys: 2,
-                        beforeDate: '1970-01-01T00:00:00.001Z',
-                    };
-                    return metadata.listLifecycleObject(BUCKET_NAME, params, logger, (err, data) => {
-                        assert.deepStrictEqual(err, null);
-                        assert.strictEqual(data.IsTruncated, true);
-                        assert.strictEqual(data.Contents.length, 2);
-                        assert.strictEqual(data.Contents[0].key, 'pfx0-test-object');
-                        assert.strictEqual(data.Contents[1].key, 'pfx3-test-object');
-                        assert.strictEqual(data.NextMarker, 'pfx3-test-object');
+            return done();
+        });
+    });

-                        return done();
-                    });
-                });
+    it('Should list orphan delete markers that start with prefix pfx4', done => {
+        const params = {
+            listingType: 'DelimiterOrphanDeleteMarker',
+            prefix: 'pfx4',
+        };
+        return metadata.listLifecycleObject(BUCKET_NAME, params, logger, (err, data) => {
+            assert.deepStrictEqual(err, null);
+            assert.strictEqual(data.IsTruncated, false);
+            assert(!data.NextMarker);
+            assert.strictEqual(data.Contents.length, 2);
+            assert.strictEqual(data.Contents[0].key, 'pfx4-test-object');
+            assert.strictEqual(data.Contents[1].key, 'pfx4-test-object2');
+
+            return done();
+        });
+    });
+
+    it('Should return the first orphan delete marker version that starts with prefix', done => {
+        const params = {
+            listingType: 'DelimiterOrphanDeleteMarker',
+            prefix: 'pfx4',
+            maxKeys: 1,
+        };
+        return metadata.listLifecycleObject(BUCKET_NAME, params, logger, (err, data) => {
+            assert.deepStrictEqual(err, null);
+            assert.strictEqual(data.IsTruncated, true);
+            assert.strictEqual(data.Contents.length, 1);
+            assert.strictEqual(data.NextMarker, 'pfx4-test-object');
+            assert.strictEqual(data.Contents[0].key, 'pfx4-test-object');
+
+            return done();
+        });
+    });
+
+    it('Should return the following orphan delete marker version that starts with prefix', done => {
+        const params = {
+            listingType: 'DelimiterOrphanDeleteMarker',
+            marker: 'pfx4-test-object',
+            prefix: 'pfx4',
+            maxKeys: 1,
+        };
+        return metadata.listLifecycleObject(BUCKET_NAME, params, logger, (err, data) => {
+            assert.deepStrictEqual(err, null);
+            assert.strictEqual(data.IsTruncated, false);
+            assert(!data.NextMarker);
+            assert.strictEqual(data.Contents.length, 1);
+            assert.strictEqual(data.Contents[0].key, 'pfx4-test-object2');
+
+            return done();
+        });
+    });
+
+    it('Should return the truncated list of orphan delete markers older than 1970-01-01T00:00:00.006Z', done => {
+        const params = {
+            listingType: 'DelimiterOrphanDeleteMarker',
+            maxKeys: 2,
+            beforeDate: '1970-01-01T00:00:00.006Z',
+        };
+        return metadata.listLifecycleObject(BUCKET_NAME, params, logger, (err, data) => {
+            assert.deepStrictEqual(err, null);
+            assert.strictEqual(data.IsTruncated, true);
+            assert.strictEqual(data.Contents.length, 2);
+            assert.strictEqual(data.Contents[0].key, 'pfx0-test-object');
+            assert.strictEqual(data.Contents[1].key, 'pfx3-test-object');
+            assert.strictEqual(data.NextMarker, 'pfx3-test-object');
+
+            return done();
+        });
+    });
+
+    it('Should return the following list of orphan delete markers older than 1970-01-01T00:00:00.006Z', done => {
+        const params = {
+            listingType: 'DelimiterOrphanDeleteMarker',
+            maxKeys: 2,
+            beforeDate: '1970-01-01T00:00:00.006Z',
+            marker: 'pfx3-test-object',
+        };
+        return metadata.listLifecycleObject(BUCKET_NAME, params, logger, (err, data) => {
+            assert.deepStrictEqual(err, null);
+            assert.strictEqual(data.IsTruncated, false);
+            assert.strictEqual(data.Contents.length, 1);
+            assert.strictEqual(data.Contents[0].key, 'pfx4-test-object');
+
+            return done();
+        });
+    });
+
+    it('Should return the truncated list of orphan delete markers older than 1970-01-01T00:00:00.001Z', done => {
+        const params = {
+            listingType: 'DelimiterOrphanDeleteMarker',
+            maxKeys: 2,
+            beforeDate: '1970-01-01T00:00:00.001Z',
+        };
+        return metadata.listLifecycleObject(BUCKET_NAME, params, logger, (err, data) => {
+            assert.deepStrictEqual(err, null);
+            assert.strictEqual(data.IsTruncated, true);
+            assert.strictEqual(data.Contents.length, 2);
+            assert.strictEqual(data.Contents[0].key, 'pfx0-test-object');
+            assert.strictEqual(data.Contents[1].key, 'pfx3-test-object');
+            assert.strictEqual(data.NextMarker, 'pfx3-test-object');
+
+            return done();
        });
    });
 });
--- a/tests/functional/metadata/mongodb/listObject.spec.js
+++ b/tests/functional/metadata/mongodb/listObject.spec.js
@ -8,8 +8,6 @@ const MetadataWrapper =
    require('../../../../lib/storage/metadata/MetadataWrapper');
 const { versioning } = require('../../../../index');
 const { BucketVersioningKeyFormat } = versioning.VersioningConstants;
-const sinon = require('sinon');
-const MongoReadStream = require('../../../../lib/storage/metadata/mongoclient/readStream');

 const IMPL_NAME = 'mongodb';
 const DB_NAME = 'metadata';
@ -72,13 +70,6 @@ describe('MongoClientInterface::metadata.listObject', () => {
            { upsert: false }).then(() => cb()).catch(err => cb(err));
    }

-    function customListingParser(entries) {
-        return entries.map(entry => {
-            const tmp = JSON.parse(entry.value);
-            return tmp;
-        });
-    }
-
    beforeAll(done => {
        mongoserver.start().then(() => {
            mongoserver.waitUntilRunning().then(() => {
@ -159,12 +150,6 @@ describe('MongoClientInterface::metadata.listObject', () => {
                            objVal: {
                                key: 'pfx1-test-object',
                                versionId: 'null',
-                                location: [{
-                                    start: 0,
-                                    size: 150,
-                                    dataStoreETag: 'etag',
-                                    dataStoreVersionId: 'versionId',
-                                }],
                            },
                            nbVersions: 5,
                        };
@ -492,81 +477,6 @@ describe('MongoClientInterface::metadata.listObject', () => {
                    }),
                ], done);
            });
-
-            it('Should properly destroy the MongoDBReadStream', done => {
-                // eslint-disable-next-line func-names
-                const destroyStub = sinon.stub(MongoReadStream.prototype, 'destroy').callsFake(function (...args) {
-                    // You can add extra logic here if needed
-                    MongoReadStream.prototype.destroy.wrappedMethod.apply(this, ...args);
-                });
-                const params = {
-                    listingType: 'DelimiterMaster',
-                    maxKeys: 100,
-                };
-                return metadata.listObject(BUCKET_NAME, params, logger, err => {
-                    assert.ifError(err);
-                    assert(destroyStub.called, 'Destroy should have been called on MongoReadStream');
-                    // Restore original destroy method
-                    destroyStub.restore();
-                    return done();
-                });
-            });
-
-
-            it('Should properly destroy the MongoDBReadStream on error', done => {
-                // eslint-disable-next-line func-names
-                const destroyStub = sinon.stub(MongoReadStream.prototype, 'destroy').callsFake(function (...args) {
-                    // You can add extra logic here if needed
-                    MongoReadStream.prototype.destroy.wrappedMethod.apply(this, ...args);
-                });
-                // stub the cursor creation to emit an error
-                // eslint-disable-next-line func-names
-                const readStub = sinon.stub(MongoReadStream.prototype, '_read').callsFake(function () {
-                    this.emit('error', new Error('error'));
-                });
-                const params = {
-                    listingType: 'DelimiterMaster',
-                    maxKeys: 100,
-                };
-                return metadata.listObject(BUCKET_NAME, params, logger, err => {
-                    assert(err, 'Expected an error');
-                    assert(destroyStub.called, 'Destroy should have been called on MongoReadStream');
-                    destroyStub.restore();
-                    readStub.restore();
-                    return done();
-                });
-            });
-
-            it('Should not include location in listing result and use custom listing parser', done => {
-                const opts = {
-                    mongodb: {
-                        replicaSetHosts: 'localhost:27020',
-                        writeConcern: 'majority',
-                        replicaSet: 'rs0',
-                        readPreference: 'primary',
-                        database: DB_NAME,
-                    },
-                    customListingParser,
-                };
-
-                const parserSpy = sinon.spy(opts, 'customListingParser');
-
-                const md = new MetadataWrapper(IMPL_NAME, opts, null, logger);
-                md.setup(() => {
-                    const params = {
-                        listingType: 'DelimiterMaster',
-                        maxKeys: 100,
-                    };
-                    return md.listObject(BUCKET_NAME, params, logger, (err, data) => {
-                        assert.ifError(err);
-                        assert.strictEqual(data.Contents.length, 3);
-                        assert.strictEqual(data.Contents[0].key, 'pfx1-test-object');
-                        assert.strictEqual(data.Contents[0].location, undefined);
-                        assert(parserSpy.called);
-                        return done();
-                    });
-                });
-            });
        });
    });
 });
--- a/tests/unit/algos/cache/GapCache.spec.ts
+++ b/tests/unit/algos/cache/GapCache.spec.ts
@ -1,265 +0,0 @@
-import GapCache from '../../../../lib/algos/cache/GapCache';
-
-describe('GapCache', () => {
-    let gapCache;
-
-    beforeEach(() => {
-        // exposureDelayMs=100, maxGaps=10, maxGapWeight=100
-        gapCache = new GapCache(100, 10, 100);
-        gapCache.start();
-    });
-    afterEach(() => {
-        gapCache.stop();
-    });
-
-    describe('getters and setters', () => {
-        it('maxGapWeight getter', () => {
-            expect(gapCache.maxGapWeight).toEqual(100);
-        });
-
-        it('maxGapWeight setter', () => {
-            gapCache.maxGapWeight = 123;
-            expect(gapCache.maxGapWeight).toEqual(123);
-            // check that internal gap sets have also been updated
-            expect(gapCache._stagingUpdates.newGaps.maxWeight).toEqual(123);
-            expect(gapCache._frozenUpdates.newGaps.maxWeight).toEqual(123);
-        });
-
-        it('exposureDelayMs getter', () => {
-            expect(gapCache.exposureDelayMs).toEqual(100);
-        });
-
-        it('exposureDelayMs setter', async () => {
-            // insert a first gap
-            gapCache.setGap('bar', 'baz', 10);
-
-            // change the exposure delay to 50ms
-            gapCache.exposureDelayMs = 50;
-            expect(gapCache.exposureDelayMs).toEqual(50);
-
-            gapCache.setGap('qux', 'quz', 10);
-
-            // wait for more than twice the new exposure delay
-            await new Promise(resolve => setTimeout(resolve, 200));
-
-            // only the second gap should have been exposed, due to the change of
-            // exposure delay subsequent to the first call to setGap()
-            expect(await gapCache.lookupGap('ape', 'zoo')).toEqual(
-                { firstKey: 'qux', lastKey: 'quz', weight: 10 }
-            );
-        });
-    });
-
-    describe('clear()', () => {
-        it('should clear all exposed gaps', async () => {
-            gapCache.setGap('bar', 'baz', 10);
-            gapCache.setGap('qux', 'quz', 20);
-            await new Promise(resolve => setTimeout(resolve, 300));
-
-            expect(await gapCache.lookupGap('ape', 'zoo')).toEqual(
-                { firstKey: 'bar', lastKey: 'baz', weight: 10 }
-            );
-            gapCache.clear();
-            expect(await gapCache.lookupGap('ape', 'zoo')).toBeNull();
-        });
-
-        it('should clear all staging gaps', async () => {
-            gapCache.setGap('bar', 'baz', 10);
-            gapCache.setGap('qux', 'quz', 20);
-
-            gapCache.clear();
-            await new Promise(resolve => setTimeout(resolve, 300));
-
-            expect(await gapCache.lookupGap('ape', 'zoo')).toBeNull();
-        });
-
-        it('should keep existing invalidating updates against the next new gaps', async () => {
-            // invalidate future gaps containing 'dog'
-            expect(gapCache.removeOverlappingGaps(['dog'])).toEqual(0);
-
-            // then, clear the cache
-            gapCache.clear();
-
-            // wait for 50ms (half of exposure delay of 100ms) before
-            // setting a new gap overlapping with 'dog'
-            await new Promise(resolve => setTimeout(resolve, 50));
-            gapCache.setGap('cat', 'fox', 10);
-
-            // also set a non-overlapping gap to make sure it is not invalidated
-            gapCache.setGap('goat', 'hog', 20);
-
-            // wait an extra 250ms to ensure all valid gaps have been exposed
-            await new Promise(resolve => setTimeout(resolve, 250));
-            // the next gap is indeed 'goat'... because 'cat'... should have been invalidated
-            expect(await gapCache.lookupGap('bat', 'zoo')).toEqual(
-                { firstKey: 'goat', lastKey: 'hog', weight: 20 });
-        });
-    });
-
-    it('should expose gaps after at least exposureDelayMs milliseconds', async () => {
-        gapCache.setGap('bar', 'baz', 10);
-        expect(await gapCache.lookupGap('ape', 'cat')).toBeNull();
-
-        // wait for 50ms which is half of the minimum time to exposure
-        await new Promise(resolve => setTimeout(resolve, 50));
-        // the gap should not be exposed yet
-        expect(await gapCache.lookupGap('ape', 'cat')).toBeNull();
-
-        // wait for an extra 250ms (total 300ms): the upper bound for exposure of any
-        // setGap() call is twice the exposureDelayMs value, so 200ms, wait an extra
-        // 100ms to cope with scheduling uncertainty and GapSet processing time, after
-        // which the gap introduced by setGap() should always be exposed.
-        await new Promise(resolve => setTimeout(resolve, 250));
-        expect(await gapCache.lookupGap('ape', 'cat')).toEqual(
-            { firstKey: 'bar', lastKey: 'baz', weight: 10 });
-
-        // check getters
-        expect(gapCache.maxGaps).toEqual(10);
-        expect(gapCache.maxGapWeight).toEqual(100);
-        expect(gapCache.size).toEqual(1);
-
-        // check iteration over the exposed gaps
-        let nGaps = 0;
-        for (const gap of gapCache) {
-            expect(gap).toEqual({ firstKey: 'bar', lastKey: 'baz', weight: 10 });
-            nGaps += 1;
-        }
-        expect(nGaps).toEqual(1);
-
-        // check toArray()
-        expect(gapCache.toArray()).toEqual([
-            { firstKey: 'bar', lastKey: 'baz', weight: 10 },
-        ]);
-    });
-
-    it('removeOverlappingGaps() should invalidate all overlapping gaps that are already exposed',
-    async () => {
-        gapCache.setGap('cat', 'fox', 10);
-        gapCache.setGap('lion', 'seal', 20);
-        // wait for 3x100ms to ensure all setGap() calls have been exposed
-        await new Promise(resolve => setTimeout(resolve, 300));
-        // expect 0 gap removed because 'hog' is not in any gap
-        expect(gapCache.removeOverlappingGaps(['hog'])).toEqual(0);
-        // expect 1 gap removed because 'cat' -> 'fox' should be already exposed
-        expect(gapCache.removeOverlappingGaps(['dog'])).toEqual(1);
-        // the gap should have been invalidated permanently
-        expect(await gapCache.lookupGap('dog', 'fox')).toBeNull();
-        // the other gap should still be present
-        expect(await gapCache.lookupGap('rat', 'tiger')).toEqual(
-            { firstKey: 'lion', lastKey: 'seal', weight: 20 });
-    });
-
-    it('removeOverlappingGaps() should invalidate all overlapping gaps that are not yet exposed',
-    async () => {
-        gapCache.setGap('cat', 'fox', 10);
-        gapCache.setGap('lion', 'seal', 20);
-        // make the following calls asynchronous for the sake of the
-        // test, but not waiting for the exposure delay
-        await new Promise(resolve => setImmediate(resolve));
-        // expect 0 gap removed because 'hog' is not in any gap
-        expect(gapCache.removeOverlappingGaps(['hog'])).toEqual(0);
-        // expect 0 gap removed because 'cat' -> 'fox' is not exposed yet,
-        // but internally it should have been removed from the staging or
-        // frozen gap set
-        expect(gapCache.removeOverlappingGaps(['dog'])).toEqual(0);
-
-        // wait for 3x100ms to ensure all non-invalidated setGap() calls have been exposed
-        await new Promise(resolve => setTimeout(resolve, 300));
-        // the gap should have been invalidated permanently
-        expect(await gapCache.lookupGap('dog', 'fox')).toBeNull();
-        // the other gap should now be exposed
-        expect(await gapCache.lookupGap('rat', 'tiger')).toEqual(
-            { firstKey: 'lion', lastKey: 'seal', weight: 20 });
-    });
-
-    it('removeOverlappingGaps() should invalidate gaps created later by setGap() but ' +
-    'within the exposure delay', async () => {
-        // wait for 80ms (slightly less than exposure delay of 100ms)
-        // before calling removeOverlappingGaps(), so that the next
-        // exposure timer kicks in before the call to setGap()
-        await new Promise(resolve => setTimeout(resolve, 80));
-
-        // there is no exposed gap yet, so expect 0 gap removed
-        expect(gapCache.removeOverlappingGaps(['dog'])).toEqual(0);
-
-        // wait for 50ms (half of exposure delay of 100ms) before
-        // setting a new gap overlapping with 'dog'
-        await new Promise(resolve => setTimeout(resolve, 50));
-        gapCache.setGap('cat', 'fox', 10);
-
-        // also set a non-overlapping gap to make sure it is not invalidated
-        gapCache.setGap('goat', 'hog', 20);
-
-        // wait an extra 250ms to ensure all valid gaps have been exposed
-        await new Promise(resolve => setTimeout(resolve, 250));
-        // the next gap is indeed 'goat'... because 'cat'... should have been invalidated
-        expect(await gapCache.lookupGap('bat', 'zoo')).toEqual(
-            { firstKey: 'goat', lastKey: 'hog', weight: 20 });
-    });
-
-    it('removeOverlappingGaps() should not invalidate gaps created more than twice ' +
-    'the exposure delay later', async () => {
-        // there is no exposed gap yet, so expect 0 gap removed
-        expect(gapCache.removeOverlappingGaps(['dog'])).toEqual(0);
-
-        // wait for 250ms (more than twice the exposure delay of 100ms) before
-        // setting a new gap overlapping with 'dog'
-        await new Promise(resolve => setTimeout(resolve, 250));
-        gapCache.setGap('cat', 'fox', 10);
-
-        // also set a non-overlapping gap to make sure it is not invalidated
-        gapCache.setGap('goat', 'hog', 20);
-
-        // wait for an extra 250ms to ensure the new gap is exposed
-        await new Promise(resolve => setTimeout(resolve, 250));
-        // should find the inserted gap as it should not have been invalidated
-        expect(await gapCache.lookupGap('bat', 'zoo')).toEqual(
-            { firstKey: 'cat', lastKey: 'fox', weight: 10 });
-    });
-
-    it('exposed gaps should be merged when possible', async () => {
-        gapCache.setGap('bar', 'baz', 10);
-        gapCache.setGap('baz', 'qux', 10);
-        // wait until the merged gap is exposed
-        await new Promise(resolve => setTimeout(resolve, 300));
-        expect(await gapCache.lookupGap('ape', 'cat')).toEqual(
-            { firstKey: 'bar', lastKey: 'qux', weight: 20 });
-    });
-
-    it('exposed gaps should be split when above maxGapWeight', async () => {
-        gapCache.setGap('bar', 'baz', gapCache.maxGapWeight - 1);
-        gapCache.setGap('baz', 'qux', 10);
-        // wait until the gaps are exposed
-        await new Promise(resolve => setTimeout(resolve, 300));
-        expect(await gapCache.lookupGap('cat', 'dog')).toEqual(
-            { firstKey: 'baz', lastKey: 'qux', weight: 10 });
-    });
-
-    it('gaps should not be exposed when reaching the maxGaps limit', async () => {
-        const gapsArray = new Array(gapCache.maxGaps).fill(undefined).map(
-            (_, i) => {
-                const firstKey = `0000${i}`.slice(-4);
-                return {
-                    firstKey,
-                    lastKey: `${firstKey}foo`,
-                    weight: 10,
-                };
-            }
-        );
-        for (const gap of gapsArray) {
-            gapCache.setGap(gap.firstKey, gap.lastKey, gap.weight);
-        }
-        // wait until the gaps are exposed
-        await new Promise(resolve => setTimeout(resolve, 300));
-        expect(gapCache.size).toEqual(gapCache.maxGaps);
-
-        gapCache.setGap('noroomforthisgap', 'noroomforthisgapfoo');
-        // wait until the gaps are exposed
-        await new Promise(resolve => setTimeout(resolve, 300));
-
-        // the number of gaps should still be 'maxGaps'
-        expect(gapCache.size).toEqual(gapCache.maxGaps);
-        // the gaps should correspond to the original array
-        expect(gapCache.toArray()).toEqual(gapsArray);
-    });
-});
--- a/tests/unit/algos/cache/GapSet.spec.ts
+++ b/tests/unit/algos/cache/GapSet.spec.ts
@ -1,878 +0,0 @@
-import { OrderedSet } from '@js-sdsl/ordered-set';
-import GapSet from '../../../../lib/algos/cache/GapSet';
-
-function genRandomKey(): string {
-    const CHARS = 'abcdefghijklmnopqrstuvwxyz0123456789';
-    return new Array(16).fill(undefined).map(
-        () => CHARS[Math.trunc(Math.random() * CHARS.length)]
-    ).join('');
-}
-
-function genRandomUnchainedGaps(nGaps) {
-    const gapBounds = new Array(nGaps * 2).fill(undefined).map(
-        () => genRandomKey()
-    );
-    gapBounds.sort();
-    const gapsArray = new Array(nGaps).fill(undefined).map(
-        (_, i) => ({
-            firstKey: gapBounds[2 * i],
-            lastKey: gapBounds[2 * i + 1],
-            weight: 10,
-        })
-    );
-    return gapsArray;
-}
-
-function genRandomChainedGaps(nGaps) {
-    const gapBounds = new Array(nGaps + 1).fill(undefined).map(
-        () => genRandomKey()
-    );
-    gapBounds.sort();
-    const gapsArray = new Array(nGaps).fill(undefined).map(
-        (_, i) => ({
-            firstKey: gapBounds[i],
-            lastKey: gapBounds[i + 1],
-            weight: 10,
-        })
-    );
-    return gapsArray;
-}
-
-/**
- * Shuffle an array in-place
- *
- * @param {any[]} - The array to shuffle
- * @return {undefined}
- */
-function shuffleArray(array) {
-    for (let i = array.length - 1; i > 0; i--) {
-        const randIndex = Math.trunc(Math.random() * (i + 1));
-        /* eslint-disable no-param-reassign */
-        const randIndexVal = array[randIndex];
-        array[randIndex] = array[i];
-        array[i] = randIndexVal;
-        /* eslint-enable no-param-reassign */
-    }
-}
-
-describe('GapSet', () => {
-    const INITIAL_GAPSET = [
-        { firstKey: 'bar', lastKey: 'baz', weight: 10 },
-        { firstKey: 'qux', lastKey: 'quz', weight: 20 },
-    ];
-    const INITIAL_GAPSET_WITH_CHAIN = [
-        // single-key gap
-        { firstKey: 'ape', lastKey: 'ape', weight: 1 },
-        // start of chain
-        { firstKey: 'bar', lastKey: 'baz', weight: 10 },
-        { firstKey: 'baz', lastKey: 'qux', weight: 15 },
-        { firstKey: 'qux', lastKey: 'quz', weight: 20 },
-        { firstKey: 'quz', lastKey: 'rat', weight: 25 },
-        { firstKey: 'rat', lastKey: 'yak', weight: 30 },
-        // end of chain
-    ]
-
-    let gapsArray;
-    let gapSet;
-    let gapsArrayWithChain;
-    let gapSetWithChain;
-    beforeEach(() => {
-        gapsArray = JSON.parse(
-            JSON.stringify(INITIAL_GAPSET)
-        );
-        gapSet = GapSet.createFromArray(gapsArray, 100);
-        gapsArrayWithChain = JSON.parse(
-            JSON.stringify(INITIAL_GAPSET_WITH_CHAIN)
-        );
-        gapSetWithChain = GapSet.createFromArray(gapsArrayWithChain, 100);
-    });
-
-    describe('GapSet::size', () => {
-        it('should return 0 for an empty gap set', () => {
-            const emptyGapSet = new GapSet(100);
-            expect(emptyGapSet.size).toEqual(0);
-        });
-
-        it('should return the size of the gap set', () => {
-            expect(gapSet.size).toEqual(2);
-        });
-
-        it('should reflect the new size after removal of gaps', () => {
-            gapSet._gaps.eraseElementByKey({ firstKey: 'bar' });
-            expect(gapSet.size).toEqual(1);
-        });
-    });
-
-    describe('GapSet::maxWeight', () => {
-        it('getter', () => {
-            const emptyGapSet = new GapSet(123);
-            expect(emptyGapSet.maxWeight).toEqual(123);
-        });
-
-        it('setter', () => {
-            const emptyGapSet = new GapSet(123);
-            emptyGapSet.maxWeight = 456;
-            expect(emptyGapSet.maxWeight).toEqual(456);
-        });
-    });
-
-    describe('GapSet::setGap()', () => {
-        it('should start a gap with a single key in empty gap set', () => {
-            const emptyGapSet = new GapSet(100);
-            const gap = emptyGapSet.setGap('foo', 'foo', 1);
-            expect(gap).toEqual({ firstKey: 'foo', lastKey: 'foo', weight: 1 });
-            expect(emptyGapSet.toArray()).toEqual([
-                { firstKey: 'foo', lastKey: 'foo', weight: 1 },
-            ]);
-        });
-
-        it('should start a gap with a single key in non-empty gap set', () => {
-            const gap = gapSet.setGap('foo', 'foo', 1);
-            expect(gap).toEqual({ firstKey: 'foo', lastKey: 'foo', weight: 1 });
-            expect(gapSet.toArray()).toEqual([
-                { firstKey: 'bar', lastKey: 'baz', weight: 10 },
-                { firstKey: 'foo', lastKey: 'foo', weight: 1 },
-                { firstKey: 'qux', lastKey: 'quz', weight: 20 },
-            ]);
-        });
-
-        it('should start a gap with multiple keys in empty gap set', () => {
-            const emptyGapSet = new GapSet(100);
-            const gap = emptyGapSet.setGap('foo', 'qux', 5);
-            expect(gap).toEqual({ firstKey: 'foo', lastKey: 'qux', weight: 5 });
-            expect(emptyGapSet.toArray()).toEqual([
-                { firstKey: 'foo', lastKey: 'qux', weight: 5 },
-            ]);
-        });
-
-        it('should return a new object rather than a gap managed by GapSet', () => {
-            const emptyGapSet = new GapSet(100);
-            const gap = emptyGapSet.setGap('foo', 'qux', 5);
-            gap.lastKey = 'quz';
-            // check that modifying the returned gap doesn't affect the GapSet
-            expect(emptyGapSet.toArray()).toEqual([
-                { firstKey: 'foo', lastKey: 'qux', weight: 5 },
-            ]);
-        });
-
-        it('should return an existing gap that includes the wanted gap', () => {
-            const gap = gapSet.setGap('bat', 'bay', 5);
-            expect(gap).toEqual({ firstKey: 'bar', lastKey: 'baz', weight: 10 });
-            expect(gapSet.toArray()).toEqual(INITIAL_GAPSET);
-        });
-
-        it('should return an existing gap that starts with the wanted gap first key', () => {
-            const gap = gapSet.setGap('bar', 'bay', 5);
-            expect(gap).toEqual({ firstKey: 'bar', lastKey: 'baz', weight: 10 });
-            expect(gapSet.toArray()).toEqual(INITIAL_GAPSET);
-        });
-
-        it('should return an existing gap that ends with the wanted gap last key', () => {
-            const gap = gapSet.setGap('bat', 'baz', 5);
-            expect(gap).toEqual({ firstKey: 'bar', lastKey: 'baz', weight: 10 });
-            expect(gapSet.toArray()).toEqual(INITIAL_GAPSET);
-        });
-
-        it('should return the existing chained gap that starts with the first key', () => {
-            const gap = gapSetWithChain.setGap('baz', 'quo', 10);
-            expect(gap).toEqual({ firstKey: 'baz', lastKey: 'qux', weight: 15 });
-            expect(gapSetWithChain.toArray()).toEqual(INITIAL_GAPSET_WITH_CHAIN);
-        });
-
-        it('should extend a single-key gap with no other gap', () => {
-            const singleKeyGap = { firstKey: 'foo', lastKey: 'foo', weight: 1 };
-            const singleKeyGapSet = GapSet.createFromArray([singleKeyGap], 100);
-
-            const extendedGap = singleKeyGapSet.setGap('foo', 'qux', 30);
-            expect(extendedGap).toEqual({ firstKey: 'foo', lastKey: 'qux', weight: 31 });
-            expect(singleKeyGapSet.toArray()).toEqual([
-                { firstKey: 'foo', lastKey: 'qux', weight: 31 },
-            ]);
-        });
-
-        it('should extend a gap with no next gap', () => {
-            // existing gap: 'qux' -> 'quz'
-            const extendedGap = gapSet.setGap('qux', 'rat', 25);
-            expect(extendedGap).toEqual({ firstKey: 'qux', lastKey: 'rat', weight: 25 });
-            expect(gapSet.toArray()).toEqual([
-                { firstKey: 'bar', lastKey: 'baz', weight: 10 },
-                { firstKey: 'qux', lastKey: 'rat', weight: 25 },
-            ]);
-        });
-
-        it('should extend a gap without overlap with next gap', () => {
-            // existing gap: 'bar' -> 'baz'
-            const extendedGap = gapSet.setGap('bar', 'dog', 15);
-            expect(extendedGap).toEqual({ firstKey: 'bar', lastKey: 'dog', weight: 15 });
-            expect(gapSet.toArray()).toEqual([
-                { firstKey: 'bar', lastKey: 'dog', weight: 15 },
-                { firstKey: 'qux', lastKey: 'quz', weight: 20 },
-            ]);
-        });
-
-        it('should extend a gap starting from its last key', () => {
-            // existing gap: 'qux' -> 'quz'
-            const extendedGap = gapSet.setGap('quz', 'rat', 5);
-            expect(extendedGap).toEqual({ firstKey: 'qux', lastKey: 'rat', weight: 25 });
-            expect(gapSet.toArray()).toEqual([
-                { firstKey: 'bar', lastKey: 'baz', weight: 10 },
-                { firstKey: 'qux', lastKey: 'rat', weight: 25 },
-            ]);
-        });
-
-        it('should merge with next gap with single-key overlap if total weight is ' +
-        'under maxWeight', () => {
-            const extendedGap = gapSet.setGap('bar', 'qux', 80);
-            // updated weight is accurately set as the sum of
-            // overlapping individual gap weights
-            expect(extendedGap).toEqual({ firstKey: 'bar', lastKey: 'quz', weight: 80 + 20 });
-            expect(gapSet.toArray()).toEqual([
-                { firstKey: 'bar', lastKey: 'quz', weight: 80 + 20 },
-            ]);
-        });
-
-        it('should chain with next gap with single-key overlap if total weight is ' +
-        'above maxWeight', () => {
-            const extendedGap = gapSet.setGap('bar', 'qux', 90);
-            expect(extendedGap).toEqual({ firstKey: 'qux', lastKey: 'quz', weight: 20 });
-            expect(gapSet.toArray()).toEqual([
-                { firstKey: 'bar', lastKey: 'qux', weight: 90 },
-                { firstKey: 'qux', lastKey: 'quz', weight: 20 },
-            ]);
-        });
-
-        it('should merge with both previous and next gap if bounds overlap by a ' +
-        'single key and total weight is under maxWeight', () => {
-            const extendedGap = gapSet.setGap('baz', 'qux', 30);
-            // updated weight is accurately set as the sum of
-            // overlapping individual gap weights
-            expect(extendedGap).toEqual({ firstKey: 'bar', lastKey: 'quz', weight: 10 + 30 + 20 });
-            expect(gapSet.toArray()).toEqual([
-                { firstKey: 'bar', lastKey: 'quz', weight: 10 + 30 + 20 },
-            ]);
-        });
-
-        it('should merge with previous gap and chain with next gap if bounds overlap by a ' +
-        'single key on either side and weight is above maxWeight when merging on right side', () => {
-            const extendedGap = gapSet.setGap('baz', 'qux', 90);
-            expect(extendedGap).toEqual({ firstKey: 'qux', lastKey: 'quz', weight: 20 });
-            expect(gapSet.toArray()).toEqual([
-                { firstKey: 'bar', lastKey: 'qux', weight: 100 },
-                { firstKey: 'qux', lastKey: 'quz', weight: 20 },
-            ]);
-        });
-
-        it('should chain with previous gap and merge with next gap if bounds overlap by a ' +
-        'single key on either side and weight is above maxWeight when merging on left side', () => {
-            // modified version of the common test set with increased weight
-            // for 'bar' -> 'baz'
-            const gapSet = GapSet.createFromArray([
-                { firstKey: 'bar', lastKey: 'baz', weight: 80 },
-                { firstKey: 'qux', lastKey: 'quz', weight: 20 },
-            ], 100);
-            const extendedGap = gapSet.setGap('baz', 'qux', 70);
-            expect(extendedGap).toEqual({ firstKey: 'baz', lastKey: 'quz', weight: 90 });
-            expect(gapSet.toArray()).toEqual([
-                { firstKey: 'bar', lastKey: 'baz', weight: 80 },
-                { firstKey: 'baz', lastKey: 'quz', weight: 90 },
-            ]);
-        });
-
-        it('should merge with both previous and next gap if left bound overlaps by a ' +
-        'single key and total weight is under maxWeight', () => {
-            const extendedGap = gapSet.setGap('baz', 'quxxx', 40);
-            // updated weight is heuristically set as the sum of the
-            // previous chained gap's weight and the new weight
-            // (excluding the overlapping gap on right side)
-            expect(extendedGap).toEqual({ firstKey: 'bar', lastKey: 'quz', weight: 10 + 40 });
-            expect(gapSet.toArray()).toEqual([
-                { firstKey: 'bar', lastKey: 'quz', weight: 10 + 40 },
-            ]);
-        });
-
-        it('should chain with previous gap and merge with next gap if left bound overlaps by a ' +
-        'single key and total weight is above maxWeight', () => {
-            const extendedGap = gapSet.setGap('baz', 'quxxx', 95);
-            // updated weight is accurately set as the sum of
-            // overlapping individual gap weights
-            expect(extendedGap).toEqual({ firstKey: 'baz', lastKey: 'quz', weight: 95 });
-            expect(gapSet.toArray()).toEqual([
-                { firstKey: 'bar', lastKey: 'baz', weight: 10 },
-                { firstKey: 'baz', lastKey: 'quz', weight: 95 },
-            ]);
-        });
-
-        it('should extend a gap with overlap with next gap and large weight', () => {
-            const extendedGap = gapSet.setGap('bar', 'quxxx', 80);
-            // updated weight is heuristically chosen to be the new
-            // gap weight which is larger than the sum of the existing merged
-            // gap weights
-            expect(extendedGap).toEqual({ firstKey: 'bar', lastKey: 'quz', weight: 80 });
-            expect(gapSet.toArray()).toEqual([
-                { firstKey: 'bar', lastKey: 'quz', weight: 80 },
-            ]);
-        });
-
-        it('should extend a gap with overlap with next gap and small weight', () => {
-            const extendedGap = gapSet.setGap('bar', 'quxxx', 11);
-            // updated weight is heuristically chosen to be the sum of the existing merged
-            // gap weights which is larger than the new gap weight
-            expect(extendedGap).toEqual({ firstKey: 'bar', lastKey: 'quz', weight: 10 + 20 });
-            expect(gapSet.toArray()).toEqual([
-                { firstKey: 'bar', lastKey: 'quz', weight: 10 + 20 },
-            ]);
-        });
-
-        it('should extend a gap with overlap beyond last key of next gap', () => {
-            const extendedGap = gapSet.setGap('bar', 'rat', 80);
-            // updated weight is the new gap weight
-            expect(extendedGap).toEqual({ firstKey: 'bar', lastKey: 'rat', weight: 80 });
-            expect(gapSet.toArray()).toEqual([
-                { firstKey: 'bar', lastKey: 'rat', weight: 80 },
-            ]);
-        });
-
-        it('should extend a gap with overlap beyond last key of next gap with a chained gap ' +
-        'if above maxWeight', () => {
-            // gapSet was initialized with maxWeight=100
-            const extendedGap = gapSet.setGap('bar', 'rat', 105);
-            // returned new gap is the right-side chained gap
-            // updated weight is the new gap weight minus the left-side chained gap's weight
-            expect(extendedGap).toEqual({ firstKey: 'baz', lastKey: 'rat', weight: 105 - 10 });
-            expect(gapSet.toArray()).toEqual([
-                { firstKey: 'bar', lastKey: 'baz', weight: 10 },
-                { firstKey: 'baz', lastKey: 'rat', weight: 105 - 10 },
-            ]);
-        });
-
-        it('should extend a single-key gap with overlap on chained gaps', () => {
-            // existing gap: 'ape' -> 'ape' (weight=1)
-            const extendedGap = gapSetWithChain.setGap('ape', 'dog', 30);
-            // updated weight heuristically including the new gap
-            // weight, which is larger than the overlapping gaps cumulated
-            // weights (10+15=25)
-            expect(extendedGap).toEqual({ firstKey: 'ape', lastKey: 'qux', weight: 30 });
-            expect(gapSetWithChain.toArray()).toEqual([
-                { firstKey: 'ape', lastKey: 'qux', weight: 30 },
-                { firstKey: 'qux', lastKey: 'quz', weight: 20 },
-                { firstKey: 'quz', lastKey: 'rat', weight: 25 },
-                { firstKey: 'rat', lastKey: 'yak', weight: 30 },
-            ]);
-        });
-
-        it('should merge and extend + update weight a gap with overlap not past end of chained gaps',
-        () => {
-            const extendedGap = gapSetWithChain.setGap('baz', 'sea', 80);
-            expect(extendedGap).toEqual({ firstKey: 'baz', lastKey: 'yak', weight: 90 });
-            expect(gapSetWithChain.toArray()).toEqual([
-                { firstKey: 'ape', lastKey: 'ape', weight: 1 },
-                { firstKey: 'bar', lastKey: 'baz', weight: 10 },
-                { firstKey: 'baz', lastKey: 'yak', weight: 90 },
-            ]);
-        });
-
-        it('should merge and extend + update weight a gap with overlap past end of chained gaps',
-        () => {
-            const extendedGap = gapSetWithChain.setGap('baz', 'zoo', 95);
-            expect(extendedGap).toEqual({ firstKey: 'baz', lastKey: 'zoo', weight: 95 });
-            expect(gapSetWithChain.toArray()).toEqual([
-                { firstKey: 'ape', lastKey: 'ape', weight: 1 },
-                { firstKey: 'bar', lastKey: 'baz', weight: 10 },
-                { firstKey: 'baz', lastKey: 'zoo', weight: 95 },
-            ]);
-        });
-
-        it('should extend gap + update weight with overlap past end of chained gaps and ' +
-        'above maxWeight', () => {
-            const extendedGap = gapSetWithChain.setGap('baz', 'zoo', 105);
-            // updated weight is the new gap weight minus the left-side chained gap's weight
-            expect(extendedGap).toEqual({ firstKey: 'qux', lastKey: 'zoo', weight: 105 - 15 });
-            expect(gapSetWithChain.toArray()).toEqual([
-                { firstKey: 'ape', lastKey: 'ape', weight: 1 },
-                { firstKey: 'bar', lastKey: 'baz', weight: 10 },
-                { firstKey: 'baz', lastKey: 'qux', weight: 15 },
-                { firstKey: 'qux', lastKey: 'zoo', weight: 105 - 15 },
-            ]);
-        });
-
-        it('should return existing chained gap with overlap above maxWeight', () => {
-            const chainedGapsArray = [
-                { firstKey: 'ant', lastKey: 'cat', weight: 90 },
-                { firstKey: 'cat', lastKey: 'fox', weight: 40 },
-            ];
-            const chainedGapsSet = GapSet.createFromArray(chainedGapsArray, 100);
-            const extendedGap = chainedGapsSet.setGap('bat', 'dog', 105);
-            expect(extendedGap).toEqual({ firstKey: 'cat', lastKey: 'fox', weight: 40 });
-            expect(chainedGapsSet.toArray()).toEqual([
-                { firstKey: 'ant', lastKey: 'cat', weight: 90 },
-                { firstKey: 'cat', lastKey: 'fox', weight: 40 },
-            ]);
-        });
-
-        it('should merge but not extend nor update weight with overlap on chained gaps', () => {
-            // existing chained gap: 'baz' -> 'qux'
-            const extendedGap = gapSetWithChain.setGap('baz', 'quxxx', 25);
-            // updated weight is the sum of the two merged gap's weights
-            expect(extendedGap).toEqual({ firstKey: 'baz', lastKey: 'quz', weight: 15 + 20 });
-            expect(gapSetWithChain.toArray()).toEqual([
-                { firstKey: 'ape', lastKey: 'ape', weight: 1 },
-                { firstKey: 'bar', lastKey: 'baz', weight: 10 },
-                { firstKey: 'baz', lastKey: 'quz', weight: 15 + 20 },
-                { firstKey: 'quz', lastKey: 'rat', weight: 25 },
-                { firstKey: 'rat', lastKey: 'yak', weight: 30 },
-            ]);
-        });
-    });
-
-    describe('GapSet::removeOverlappingGaps()', () => {
-        describe('with zero key as parameter', () => {
-            it('passed in an array: should not remove any gap', () => {
-                const nRemoved = gapSet.removeOverlappingGaps([]);
-                expect(nRemoved).toEqual(0);
-                expect(gapSet.toArray()).toEqual(INITIAL_GAPSET);
-            });
-            it('passed in a OrderedSet: should not remove any gap', () => {
-                const nRemoved = gapSet.removeOverlappingGaps(new OrderedSet());
-                expect(nRemoved).toEqual(0);
-                expect(gapSet.toArray()).toEqual(INITIAL_GAPSET);
-            });
-        });
-        describe('with an array of one key as parameter', () => {
-            it('should not remove any gap if no overlap', () => {
-                const nRemoved = gapSet.removeOverlappingGaps(['rat']);
-                expect(nRemoved).toEqual(0);
-                expect(gapSet.toArray()).toEqual(INITIAL_GAPSET);
-            });
-
-            it('should remove a single gap if overlaps', () => {
-                const nRemoved = gapSet.removeOverlappingGaps(['bat']);
-                expect(nRemoved).toEqual(1);
-                expect(gapSet.toArray()).toEqual([
-                    // removed: { firstKey: 'bar', lastKey: 'baz', weight: 10 },
-                    { firstKey: 'qux', lastKey: 'quz', weight: 20 },
-                ]);
-            });
-
-            it('should remove a single gap if overlaps with first key of first gap', () => {
-                const nRemoved = gapSet.removeOverlappingGaps(['bar']);
-                expect(nRemoved).toEqual(1);
-                expect(gapSet.toArray()).toEqual([
-                    // removed: { firstKey: 'bar', lastKey: 'baz', weight: 10 },
-                    { firstKey: 'qux', lastKey: 'quz', weight: 20 },
-                ]);
-            });
-
-            it('should remove a single gap if overlaps with first key of non-first gap', () => {
-                const nRemoved = gapSet.removeOverlappingGaps(['qux']);
-                expect(nRemoved).toEqual(1);
-                expect(gapSet.toArray()).toEqual([
-                    { firstKey: 'bar', lastKey: 'baz', weight: 10 },
-                    // removed: { firstKey: 'qux', lastKey: 'quz', weight: 20 },
-                ]);
-            });
-
-            it('should remove a single gap if overlaps with last key', () => {
-                const nRemoved = gapSet.removeOverlappingGaps(['quz']);
-                expect(nRemoved).toEqual(1);
-                expect(gapSet.toArray()).toEqual([
-                    { firstKey: 'bar', lastKey: 'baz', weight: 10 },
-                    // removed: { firstKey: 'qux', lastKey: 'quz', weight: 20 },
-                ]);
-            });
-
-            it('should remove a single gap in chain if overlaps with one chained gap', () => {
-                const nRemoved = gapSetWithChain.removeOverlappingGaps(['dog']);
-                expect(nRemoved).toEqual(1);
-                expect(gapSetWithChain.toArray()).toEqual([
-                    { firstKey: 'ape', lastKey: 'ape', weight: 1 },
-                    { firstKey: 'bar', lastKey: 'baz', weight: 10 },
-                    // removed: { firstKey: 'baz', lastKey: 'qux', weight: 15 },
-                    { firstKey: 'qux', lastKey: 'quz', weight: 20 },
-                    { firstKey: 'quz', lastKey: 'rat', weight: 25 },
-                    { firstKey: 'rat', lastKey: 'yak', weight: 30 },
-                ]);
-            });
-
-            it('should remove two gaps in chain if overlaps with two chained gap', () => {
-                const nRemoved = gapSetWithChain.removeOverlappingGaps(['qux']);
-                expect(nRemoved).toEqual(2);
-                expect(gapSetWithChain.toArray()).toEqual([
-                    { firstKey: 'ape', lastKey: 'ape', weight: 1 },
-                    { firstKey: 'bar', lastKey: 'baz', weight: 10 },
-                    // removed: { firstKey: 'baz', lastKey: 'qux', weight: 15 },
-                    // removed: { firstKey: 'qux', lastKey: 'quz', weight: 20 },
-                    { firstKey: 'quz', lastKey: 'rat', weight: 25 },
-                    { firstKey: 'rat', lastKey: 'yak', weight: 30 },
-                ]);
-            });
-        });
-
-        describe('with an array of two keys as parameter', () => {
-            it('should not remove any gap if no overlap', () => {
-                const nRemoved = gapSet.removeOverlappingGaps(['rat', `rat\0v100`]);
-                expect(nRemoved).toEqual(0);
-                expect(gapSet.toArray()).toEqual(INITIAL_GAPSET);
-            });
-
-            it('should remove a single gap if both keys overlap', () => {
-                const nRemoved = gapSet.removeOverlappingGaps(['bat', 'bat\0v100']);
-                expect(nRemoved).toEqual(1);
-                expect(gapSet.toArray()).toEqual([
-                    // removed: { firstKey: 'bar', lastKey: 'baz', weight: 10 },
-                    { firstKey: 'qux', lastKey: 'quz', weight: 20 },
-                ]);
-            });
-
-            it('should remove a single gap if min key overlaps with first key of first gap', () => {
-                const nRemoved = gapSet.removeOverlappingGaps(['bar\0v100', 'bar']);
-                expect(nRemoved).toEqual(1);
-                expect(gapSet.toArray()).toEqual([
-                    // removed: { firstKey: 'bar', lastKey: 'baz', weight: 10 },
-                    { firstKey: 'qux', lastKey: 'quz', weight: 20 },
-                ]);
-            });
-
-            it('should remove a single gap if max key overlaps with first key of first gap', () => {
-                const nRemoved = gapSet.removeOverlappingGaps(['ape', 'bar']);
-                expect(nRemoved).toEqual(1);
-                expect(gapSet.toArray()).toEqual([
-                    // removed: { firstKey: 'bar', lastKey: 'baz', weight: 10 },
-                    { firstKey: 'qux', lastKey: 'quz', weight: 20 },
-                ]);
-            });
-
-            it('should not remove any gap if both keys straddle an existing gap without overlap',
-            () => {
-                const nRemoved = gapSet.removeOverlappingGaps(['cow', 'ape']);
-                expect(nRemoved).toEqual(0);
-                expect(gapSet.toArray()).toEqual([
-                    { firstKey: 'bar', lastKey: 'baz', weight: 10 },
-                    { firstKey: 'qux', lastKey: 'quz', weight: 20 },
-                ]);
-            });
-
-            it('should remove the two last gaps in chained gaps if last gap bounds match ' +
-            'the two keys', () => {
-                const nRemoved = gapSetWithChain.removeOverlappingGaps(['yak', 'rat']);
-                expect(nRemoved).toEqual(2);
-                expect(gapSetWithChain.toArray()).toEqual([
-                    { firstKey: 'ape', lastKey: 'ape', weight: 1 },
-                    { firstKey: 'bar', lastKey: 'baz', weight: 10 },
-                    { firstKey: 'baz', lastKey: 'qux', weight: 15 },
-                    { firstKey: 'qux', lastKey: 'quz', weight: 20 },
-                    // removed: { firstKey: 'quz', lastKey: 'rat', weight: 25 },
-                    // removed: { firstKey: 'rat', lastKey: 'yak', weight: 30 },
-                ]);
-            });
-
-            it('should remove first and last gap in chained gaps if their bounds match ' +
-            'the two keys', () => {
-                const nRemoved = gapSetWithChain.removeOverlappingGaps(['yak', 'bar']);
-                expect(nRemoved).toEqual(2);
-                expect(gapSetWithChain.toArray()).toEqual([
-                    { firstKey: 'ape', lastKey: 'ape', weight: 1 },
-                    // removed: { firstKey: 'bar', lastKey: 'baz', weight: 10 },
-                    { firstKey: 'baz', lastKey: 'qux', weight: 15 },
-                    { firstKey: 'qux', lastKey: 'quz', weight: 20 },
-                    { firstKey: 'quz', lastKey: 'rat', weight: 25 },
-                    // removed: { firstKey: 'rat', lastKey: 'yak', weight: 30 },
-                ]);
-            });
-        });
-
-        describe('with an array of three keys as parameter', () => {
-            it('should remove a single gap if only median key overlaps with gap', () => {
-                const nRemoved = gapSet.removeOverlappingGaps(['ape', 'bat', 'cow']);
-                expect(nRemoved).toEqual(1);
-                expect(gapSet.toArray()).toEqual([
-                    // removed: { firstKey: 'bar', lastKey: 'baz', weight: 10 },
-                    { firstKey: 'qux', lastKey: 'quz', weight: 20 },
-                ]);
-            });
-
-            it('should remove a single-key gap and two contiguous chained gaps each overlapping' +
-            'with one key', () => {
-                const nRemoved = gapSetWithChain.removeOverlappingGaps(['ape', 'bat', 'cow']);
-                expect(nRemoved).toEqual(3);
-                expect(gapSetWithChain.toArray()).toEqual([
-                    // removed: { firstKey: 'ape', lastKey: 'ape', weight: 1 },
-                    // removed: { firstKey: 'bar', lastKey: 'baz', weight: 10 },
-                    // removed: { firstKey: 'baz', lastKey: 'qux', weight: 15 },
-                    { firstKey: 'qux', lastKey: 'quz', weight: 20 },
-                    { firstKey: 'quz', lastKey: 'rat', weight: 25 },
-                    { firstKey: 'rat', lastKey: 'yak', weight: 30 },
-                ]);
-            });
-
-            it('should not remove any gap if all keys are intermingled but do not overlap', () => {
-                const nRemoved = gapSet.removeOverlappingGaps(['ape', 'rat', 'cow']);
-                expect(nRemoved).toEqual(0);
-                expect(gapSet.toArray()).toEqual([
-                    { firstKey: 'bar', lastKey: 'baz', weight: 10 },
-                    { firstKey: 'qux', lastKey: 'quz', weight: 20 },
-                ]);
-            });
-
-            it('should remove three discontiguous chained gaps each overlapping with one key', () => {
-                const nRemoved = gapSetWithChain.removeOverlappingGaps(['bat', 'quxxx', 'tiger']);
-                expect(nRemoved).toEqual(3);
-                expect(gapSetWithChain.toArray()).toEqual([
-                    { firstKey: 'ape', lastKey: 'ape', weight: 1 },
-                    // removed: { firstKey: 'bar', lastKey: 'baz', weight: 10 },
-                    { firstKey: 'baz', lastKey: 'qux', weight: 15 },
-                    // removed: { firstKey: 'qux', lastKey: 'quz', weight: 20 },
-                    { firstKey: 'quz', lastKey: 'rat', weight: 25 },
-                    // { firstKey: 'rat', lastKey: 'yak', weight: 30 },
-                ]);
-            });
-        });
-
-        describe('with a OrderedSet of three keys as parameter', () => {
-            it('should remove a single gap if only median key overlaps with gap', () => {
-                const nRemoved = gapSet.removeOverlappingGaps(
-                    new OrderedSet(['ape', 'bat', 'cow']));
-                expect(nRemoved).toEqual(1);
-                expect(gapSet.toArray()).toEqual([
-                    // removed: { firstKey: 'bar', lastKey: 'baz', weight: 10 },
-                    { firstKey: 'qux', lastKey: 'quz', weight: 20 },
-                ]);
-            });
-        });
-
-        // this helper checks that:
-        // - the gaps not overlapping with any key are still present in newGapsArray
-        // - and the gaps overlapping with at least one key have been removed from oldGapsArray
-        // NOTE: It uses a sorted list of keys for efficiency, otherwise it would require
-        // O(n^2) compute time which would be expensive with 50K keys.
-        function checkOverlapInvariant(sortedKeys, oldGapsArray, newGapsArray) {
-            let oldGapIdx = 0;
-            let newGapIdx = 0;
-            for (const key of sortedKeys) {
-                // for all gaps not overlapping with any key in 'sortedKeys',
-                // check that they are still in 'newGapsArray'
-                while (oldGapIdx < oldGapsArray.length &&
-                       oldGapsArray[oldGapIdx].lastKey < key) {
-                    expect(oldGapsArray[oldGapIdx]).toEqual(newGapsArray[newGapIdx]);
-                    oldGapIdx += 1;
-                    newGapIdx += 1;
-                }
-                // for the gap(s) overlapping with the current key,
-                // check that they have been removed from 'newGapsArray'
-                while (oldGapIdx < oldGapsArray.length &&
-                       oldGapsArray[oldGapIdx].firstKey <= key) {
-                    if (newGapIdx < newGapsArray.length) {
-                        expect(oldGapsArray[oldGapIdx]).not.toEqual(newGapsArray[newGapIdx]);
-                    }
-                    ++oldGapIdx;
-                }
-            }
-            // check the range after the last key in 'sortedKeys'
-            while (oldGapIdx < oldGapsArray.length) {
-                expect(oldGapsArray[oldGapIdx]).toEqual(newGapsArray[newGapIdx]);
-                oldGapIdx += 1;
-                newGapIdx += 1;
-            }
-            // check that no extra range is in newGapsArray
-            expect(newGapIdx).toEqual(newGapsArray.length);
-        }
-
-        [false, true].forEach(chained => {
-            describe(`with 10K random ${chained ? 'chained' : 'unchained'} gaps`, () => {
-                let largeGapsArray;
-                let largeGapSet;
-                beforeEach(() => {
-                    largeGapsArray = chained ?
-                        genRandomChainedGaps(10000) :
-                        genRandomUnchainedGaps(10000);
-                    largeGapSet = GapSet.createFromArray(largeGapsArray, 100);
-                });
-
-                [{
-                    desc: 'equal to their first key',
-                    getGapKey: gap => gap.firstKey,
-                }, {
-                    desc: 'equal to their last key',
-                    getGapKey: gap => gap.lastKey,
-                }, {
-                    desc: 'neither their first nor last key',
-                    getGapKey: gap => `${gap.firstKey}/foo`,
-                }].forEach(testCase => {
-                    it(`should remove the overlapping gap(s) with one key ${testCase.desc}`, () => {
-                        const gapIndex = 5000;
-                        const gap = largeGapsArray[gapIndex];
-                        const overlappingKey = testCase.getGapKey(gap);
-                        const nRemoved = largeGapSet.removeOverlappingGaps([overlappingKey]);
-                        let firstRemovedGapIndex, lastRemovedGapIndex;
-                        if (chained && overlappingKey === gap.firstKey) {
-                            expect(nRemoved).toEqual(2);
-                            [firstRemovedGapIndex, lastRemovedGapIndex] = [4999, 5000];
-                        } else if (chained && overlappingKey === gap.lastKey) {
-                            expect(nRemoved).toEqual(2);
-                            [firstRemovedGapIndex, lastRemovedGapIndex] = [5000, 5001];
-                        } else {
-                            expect(nRemoved).toEqual(1);
-                            [firstRemovedGapIndex, lastRemovedGapIndex] = [5000, 5000];
-                        }
-                        const expectedGaps = [
-                            ...largeGapsArray.slice(0, firstRemovedGapIndex),
-                            ...largeGapsArray.slice(lastRemovedGapIndex + 1)
-                        ];
-                        const newGaps = largeGapSet.toArray();
-                        expect(newGaps).toEqual(expectedGaps);
-                    });
-
-                    it(`should remove all gaps when they all overlap with one key ${testCase.desc}`,
-                       () => {
-                           // simulate a scenario made of 200 batches of 50 operations, each with
-                           // random keys scattered across all gaps that each overlaps a distinct gap
-                           // (supposedly a worst-case performance scenario for such batch sizes)
-                           const overlappingKeys = largeGapsArray.map(testCase.getGapKey);
-                           shuffleArray(overlappingKeys);
-                           for (let i = 0; i < overlappingKeys.length; i += 50) {
-                               const nRemoved = largeGapSet.removeOverlappingGaps(
-                                   overlappingKeys.slice(i, i + 50));
-                               // with unchained gaps, we expect to have removed exactly
-                               // 50 gaps (the size of 'overlappingKeys').
-                               if (!chained) {
-                                   expect(nRemoved).toEqual(50);
-                               }
-                           }
-                           const newGaps = largeGapSet.toArray();
-                           expect(newGaps).toEqual([]);
-                       });
-                });
-
-                it('should remove only and all overlapping gaps with 50K randomized keys', () => {
-                    const randomizedKeys = new Array(50000).fill(undefined).map(
-                        () => genRandomKey()
-                    );
-                    for (let i = 0; i < randomizedKeys.length; i += 50) {
-                        largeGapSet.removeOverlappingGaps(
-                            randomizedKeys.slice(i, i + 50));
-                    }
-                    const newGaps = largeGapSet.toArray();
-                    randomizedKeys.sort();
-                    checkOverlapInvariant(randomizedKeys, largeGapsArray, newGaps);
-                });
-            });
-        });
-    });
-
-    describe('GapSet::_coalesceGapChain()', () => {
-        afterEach(() => {
-            // check that the gap sets were not modified by the operation
-            expect(gapSet.toArray()).toEqual(INITIAL_GAPSET);
-            expect(gapSetWithChain.toArray()).toEqual(INITIAL_GAPSET_WITH_CHAIN);
-        });
-        it('should not coalesce if gaps are not chained', async () => {
-            const gap = { firstKey: 'bar', lastKey: 'baz', weight: 10 };
-            const coalescedGap = await gapSet._coalesceGapChain(gap);
-            expect(coalescedGap).toEqual({ firstKey: 'bar', lastKey: 'baz', weight: 10 });
-        });
-
-        it('should coalesce one chained gap', async () => {
-            const gap = { firstKey: 'quz', lastKey: 'rat', weight: 25 };
-            const coalescedGap = await gapSetWithChain._coalesceGapChain(gap);
-            expect(coalescedGap).toEqual({ firstKey: 'quz', lastKey: 'yak', weight: 55 });
-        });
-
-        it('should coalesce a chain of five gaps', async () => {
-            const gap = { firstKey: 'bar', lastKey: 'baz', weight: 10 };
-            const coalescedGap = await gapSetWithChain._coalesceGapChain(gap);
-            expect(coalescedGap).toEqual({ firstKey: 'bar', lastKey: 'yak', weight: 100 });
-        });
-
-        it('should coalesce a chain of one thousand gaps', async () => {
-            const getKey = i => `000${i}`.slice(-4);
-            const thousandGapsArray = new Array(1000).fill(undefined).map(
-                (_, i) => ({ firstKey: getKey(i), lastKey: getKey(i + 1), weight: 10 })
-            );
-            const thousandGapsSet = GapSet.createFromArray(thousandGapsArray, 100);
-            const gap = { firstKey: '0000', lastKey: '0001', weight: 10 };
-            const coalescedGap = await thousandGapsSet._coalesceGapChain(gap);
-            expect(coalescedGap).toEqual({ firstKey: '0000', lastKey: '1000', weight: 10000 });
-        });
-
-        it('should coalesce a single-key gap', async () => {
-            const singleKeyGapSet = GapSet.createFromArray([
-                { firstKey: '0000', lastKey: '0000', weight: 1 },
-            ], 100);
-            const gap = { firstKey: '0000', lastKey: '0000', weight: 1 };
-            const coalescedGap = await singleKeyGapSet._coalesceGapChain(gap);
-            expect(coalescedGap).toEqual({ firstKey: '0000', lastKey: '0000', weight: 1 });
-        });
-
-        it('should coalesce a chain of two gaps ending with a single-key gap', async () => {
-            const singleKeyGapSet = GapSet.createFromArray([
-                { firstKey: '0000', lastKey: '0003', weight: 9 },
-                { firstKey: '0003', lastKey: '0003', weight: 1 },
-            ], 100);
-            const gap = { firstKey: '0000', lastKey: '0003', weight: 9 };
-            const coalescedGap = await singleKeyGapSet._coalesceGapChain(gap);
-            expect(coalescedGap).toEqual({ firstKey: '0000', lastKey: '0003', weight: 9 });
-        });
-    });
-
-    describe('GapSet::lookupGap()', () => {
-        afterEach(() => {
-            // check that the gap sets were not modified by the operation
-            expect(gapSet.toArray()).toEqual(INITIAL_GAPSET);
-            expect(gapSetWithChain.toArray()).toEqual(INITIAL_GAPSET_WITH_CHAIN);
-        });
-
-        it('should return null with empty cache', async () => {
-            const emptyGapSet = new GapSet(100);
-            const gap = await emptyGapSet.lookupGap('cat', 'dog');
-            expect(gap).toBeNull();
-        });
-
-        it('should return null if no gap overlaps [minKey, maxKey]', async () => {
-            const gap = await gapSet.lookupGap('cat', 'dog');
-            expect(gap).toBeNull();
-        });
-
-        it('should return the first gap that overlaps if all gaps overlap', async () => {
-            const gap = await gapSet.lookupGap('ape', 'zoo');
-            expect(gap).toEqual({ firstKey: 'bar', lastKey: 'baz', weight: 10 });
-        });
-
-        it('should return an existing gap that contains [minKey, maxKey]', async () => {
-            const gap1 = await gapSet.lookupGap('bat', 'bay');
-            expect(gap1).toEqual({ firstKey: 'bar', lastKey: 'baz', weight: 10 });
-            const gap2 = await gapSet.lookupGap('quxxx', 'quy');
-            expect(gap2).toEqual({ firstKey: 'qux', lastKey: 'quz', weight: 20 });
-        });
-
-        it('should return an existing gap that overlaps with minKey but not maxKey', async () => {
-            const gap = await gapSet.lookupGap('ape', 'bat');
-            expect(gap).toEqual({ firstKey: 'bar', lastKey: 'baz', weight: 10 });
-        });
-
-        it('should return an existing gap that overlaps just with minKey when no maxKey is provided',
-        async () => {
-            const gap = await gapSet.lookupGap('ape');
-            expect(gap).toEqual({ firstKey: 'bar', lastKey: 'baz', weight: 10 });
-        });
-
-        it('should return an existing gap that overlaps with maxKey but not minKey', async () => {
-            const gap = await gapSet.lookupGap('bat', 'cat');
-            expect(gap).toEqual({ firstKey: 'bar', lastKey: 'baz', weight: 10 });
-        });
-
-        it('should return an existing gap that is contained in [minKey, maxKey] strictly', async () => {
-            const gap = await gapSet.lookupGap('dog', 'rat');
-            expect(gap).toEqual({ firstKey: 'qux', lastKey: 'quz', weight: 20 });
-        });
-
-        it('should return a coalesced gap from chained gaps that fully overlaps [minKey, maxKey]', async () => {
-            const gap = await gapSetWithChain.lookupGap('bat', 'zoo');
-            expect(gap).toEqual({ firstKey: 'bar', lastKey: 'yak', weight: 100 });
-        });
-
-        it('should return a coalesced gap from chained gaps that contain [minKey, maxKey] strictly',
-        async () => {
-            const gap = await gapSetWithChain.lookupGap('bog', 'dog');
-            expect(gap).toEqual({ firstKey: 'baz', lastKey: 'yak', weight: 90 });
-        });
-    });
-});
--- a/tests/unit/algos/list/delimiter.spec.js
+++ b/tests/unit/algos/list/delimiter.spec.js
@ -7,17 +7,23 @@ const DelimiterMaster =
    require('../../../../lib/algos/list/delimiterMaster').DelimiterMaster;
 const Werelogs = require('werelogs').Logger;
 const logger = new Werelogs('listTest');
+const performListing = require('../../../utils/performListing');
 const zpad = require('../../helpers').zpad;
 const { inc } = require('../../../../lib/algos/list/tools');
 const VSConst = require('../../../../lib/versioning/constants').VersioningConstants;
 const { DbPrefixes } = VSConst;

 class Test {
-    constructor(name, input, genMDParams, output) {
+    constructor(name, input, genMDParams, output, filter) {
        this.name = name;
        this.input = input;
        this.genMDParams = genMDParams;
        this.output = output;
+        this.filter = filter || this._defaultFilter;
+    }
+
+    _defaultFilter() {
+        return true;
    }
 }

@ -27,7 +33,7 @@ const valueDeleteMarker = '{"hello":"world","isDeleteMarker":"true"}';
 const data = [
    { key: 'Pâtisserie=中文-español-English', value },
    { key: 'notes/spring/1.txt', value },
-    { key: 'notes/spring/4.txt', value },
+    { key: 'notes/spring/2.txt', value },
    { key: 'notes/spring/march/1.txt', value },
    { key: 'notes/summer/1.txt', value },
    { key: 'notes/summer/2.txt', value },
@ -50,9 +56,6 @@ const dataVersioned = [
    { key: 'notes/spring/2.txt\0foo', value },
    { key: 'notes/spring/3.txt', value: valueDeleteMarker },
    { key: 'notes/spring/3.txt\0foo', value },
-    { key: 'notes/spring/4.txt', value: valuePHD },
-    { key: 'notes/spring/4.txt\0bar', value },
-    { key: 'notes/spring/4.txt\0foo', value },
    { key: 'notes/spring/march/1.txt', value },
    { key: 'notes/spring/march/1.txt\0bar', value },
    { key: 'notes/spring/march/1.txt\0foo', value },
@ -75,8 +78,15 @@ const dataVersioned = [
    { key: 'notes/yore.rs', value },
    { key: 'notes/zaphod/Beeblebrox.txt', value },
 ];
+const nonAlphabeticalData = [
+    { key: 'zzz', value },
+    { key: 'aaa', value },
+];

 const receivedData = data.map(item => ({ key: item.key, value: item.value }));
+const receivedNonAlphaData = nonAlphabeticalData.map(
+    item => ({ key: item.key, value: item.value }),
+);

 const tests = [
    new Test('all elements', {}, {
@ -114,7 +124,7 @@ const tests = [
        Delimiter: undefined,
        IsTruncated: false,
        NextMarker: undefined,
-    }),
+    }, (e, input) => e.key > input.marker),
    new Test('with bad marker', {
        marker: 'zzzz',
        delimiter: '/',
@ -132,7 +142,7 @@ const tests = [
        Delimiter: '/',
        IsTruncated: false,
        NextMarker: undefined,
-    }),
+    }, (e, input) => e.key > input.marker),
    new Test('with makKeys', {
        maxKeys: 3,
    }, {
@ -209,12 +219,12 @@ const tests = [
        marker: 'notes/summer0',
    }, {
        v0: {
-            gt: 'notes/summer0',
-            lt: 'notes/summer0',
+            gt: `notes/summer${inc('/')}`,
+            lt: `notes/summer${inc('/')}`,
        },
        v1: {
-            gt: `${DbPrefixes.Master}notes/summer0`,
-            lt: `${DbPrefixes.Master}notes/summer0`,
+            gt: `${DbPrefixes.Master}notes/summer${inc('/')}`,
+            lt: `${DbPrefixes.Master}notes/summer${inc('/')}`,
        },
    }, {
        Contents: [],
@ -222,18 +232,18 @@ const tests = [
        Delimiter: '/',
        IsTruncated: false,
        NextMarker: undefined,
-    }),
+    }, (e, input) => e.key > input.marker),
    new Test('delimiter and prefix (related to #147)', {
        delimiter: '/',
        prefix: 'notes/',
    }, {
        v0: {
            gte: 'notes/',
-            lt: 'notes0',
+            lt: `notes${inc('/')}`,
        },
        v1: {
            gte: `${DbPrefixes.Master}notes/`,
-            lt: `${DbPrefixes.Master}notes0`,
+            lt: `${DbPrefixes.Master}notes${inc('/')}`,
        },
    }, {
        Contents: [
@ -256,11 +266,11 @@ const tests = [
    }, {
        v0: {
            gt: 'notes/year.txt',
-            lt: 'notes0',
+            lt: `notes${inc('/')}`,
        },
        v1: {
            gt: `${DbPrefixes.Master}notes/year.txt`,
-            lt: `${DbPrefixes.Master}notes0`,
+            lt: `${DbPrefixes.Master}notes${inc('/')}`,
        },
    }, {
        Contents: [
@ -272,8 +282,8 @@ const tests = [
        Delimiter: '/',
        IsTruncated: false,
        NextMarker: undefined,
-    }),
-    new Test('all parameters 1/5', {
+    }, (e, input) => e.key > input.marker),
+    new Test('all parameters 1/3', {
        delimiter: '/',
        prefix: 'notes/',
        marker: 'notes/',
@ -281,11 +291,11 @@ const tests = [
    }, {
        v0: {
            gt: 'notes/',
-            lt: 'notes0',
+            lt: `notes${inc('/')}`,
        },
        v1: {
            gt: `${DbPrefixes.Master}notes/`,
-            lt: `${DbPrefixes.Master}notes0`,
+            lt: `${DbPrefixes.Master}notes${inc('/')}`,
        },
    }, {
        Contents: [],
@ -293,21 +303,21 @@ const tests = [
        Delimiter: '/',
        IsTruncated: true,
        NextMarker: 'notes/spring/',
-    }),
+    }, (e, input) => e.key > input.marker),

-    new Test('all parameters 2/5', {
+    new Test('all parameters 2/3', {
        delimiter: '/',
-        prefix: 'notes/',
+        prefix: 'notes/', // prefix
        marker: 'notes/spring/',
        maxKeys: 1,
    }, {
        v0: {
-            gte: 'notes/spring0',
-            lt: 'notes0',
+            gt: 'notes/spring/',
+            lt: `notes${inc('/')}`,
        },
        v1: {
-            gte: `${DbPrefixes.Master}notes/spring0`,
-            lt: `${DbPrefixes.Master}notes0`,
+            gt: `${DbPrefixes.Master}notes/spring/`,
+            lt: `${DbPrefixes.Master}notes${inc('/')}`,
        },
    }, {
        Contents: [],
@ -315,21 +325,21 @@ const tests = [
        Delimiter: '/',
        IsTruncated: true,
        NextMarker: 'notes/summer/',
-    }),
+    }, (e, input) => e.key > input.marker),

-    new Test('all parameters 3/5', {
+    new Test('all parameters 3/3', {
        delimiter: '/',
-        prefix: 'notes/',
+        prefix: 'notes/', // prefix
        marker: 'notes/summer/',
        maxKeys: 1,
    }, {
        v0: {
-            gte: 'notes/summer0',
-            lt: 'notes0',
+            gt: 'notes/summer/',
+            lt: `notes${inc('/')}`,
        },
        v1: {
-            gte: `${DbPrefixes.Master}notes/summer0`,
-            lt: `${DbPrefixes.Master}notes0`,
+            gt: `${DbPrefixes.Master}notes/summer/`,
+            lt: `${DbPrefixes.Master}notes${inc('/')}`,
        },
    }, {
        Contents: [
@ -339,21 +349,21 @@ const tests = [
        Delimiter: '/',
        IsTruncated: true,
        NextMarker: 'notes/year.txt',
-    }),
+    }, (e, input) => e.key > input.marker),

-    new Test('all parameters 4/5', {
+    new Test('all parameters 4/3', {
        delimiter: '/',
-        prefix: 'notes/',
+        prefix: 'notes/', // prefix
        marker: 'notes/year.txt',
        maxKeys: 1,
    }, {
        v0: {
            gt: 'notes/year.txt',
-            lt: 'notes0',
+            lt: `notes${inc('/')}`,
        },
        v1: {
            gt: `${DbPrefixes.Master}notes/year.txt`,
-            lt: `${DbPrefixes.Master}notes0`,
+            lt: `${DbPrefixes.Master}notes${inc('/')}`,
        },
    }, {
        Contents: [
@ -363,9 +373,9 @@ const tests = [
        Delimiter: '/',
        IsTruncated: true,
        NextMarker: 'notes/yore.rs',
-    }),
+    }, (e, input) => e.key > input.marker),

-    new Test('all parameters 5/5', {
+    new Test('all parameters 5/3', {
        delimiter: '/',
        prefix: 'notes/',
        marker: 'notes/yore.rs',
@ -373,11 +383,11 @@ const tests = [
    }, {
        v0: {
            gt: 'notes/yore.rs',
-            lt: 'notes0',
+            lt: `notes${inc('/')}`,
        },
        v1: {
            gt: `${DbPrefixes.Master}notes/yore.rs`,
-            lt: `${DbPrefixes.Master}notes0`,
+            lt: `${DbPrefixes.Master}notes${inc('/')}`,
        },
    }, {
        Contents: [],
@ -385,29 +395,7 @@ const tests = [
        Delimiter: '/',
        IsTruncated: false,
        NextMarker: undefined,
-    }),
-
-    new Test('marker inside common prefix', {
-        delimiter: '/',
-        prefix: 'notes/',
-        marker: 'notes/spring/1.txt',
-        maxKeys: 1,
-    }, {
-        v0: {
-            gte: 'notes/spring0',
-            lt: 'notes0',
-        },
-        v1: {
-            gte: `${DbPrefixes.Master}notes/spring0`,
-            lt: `${DbPrefixes.Master}notes0`,
-        },
-    }, {
-        Contents: [],
-        CommonPrefixes: ['notes/summer/'],
-        Delimiter: '/',
-        IsTruncated: true,
-        NextMarker: 'notes/summer/',
-    }),
+    }, (e, input) => e.key > input.marker),

    new Test('all elements v2', {
        v2: true,
@ -447,7 +435,7 @@ const tests = [
        Delimiter: undefined,
        IsTruncated: false,
        NextContinuationToken: undefined,
-    }),
+    }, (e, input) => e.key > input.startAfter),
    new Test('with bad startAfter', {
        startAfter: 'zzzz',
        delimiter: '/',
@ -466,7 +454,7 @@ const tests = [
        Delimiter: '/',
        IsTruncated: false,
        NextContinuationToken: undefined,
-    }),
+    }, (e, input) => e.key > input.startAfter),
    new Test('with valid continuationToken', {
        continuationToken: receivedData[4].key,
        v2: true,
@ -490,7 +478,7 @@ const tests = [
        Delimiter: undefined,
        IsTruncated: false,
        NextContinuationToken: undefined,
-    }),
+    }, (e, input) => e.key > input.continuationToken),
    new Test('with bad continuationToken', {
        continuationToken: 'zzzz',
        delimiter: '/',
@ -509,49 +497,47 @@ const tests = [
        Delimiter: '/',
        IsTruncated: false,
        NextContinuationToken: undefined,
-    }),
+    }, (e, input) => e.key > input.continuationToken),
    new Test('bad startAfter and good prefix', {
        delimiter: '/',
        prefix: 'notes/summer/',
        startAfter: 'notes/summer0',
-        v2: true,
    }, {
        v0: {
-            gt: 'notes/summer0',
-            lt: 'notes/summer0',
+            gte: 'notes/summer/',
+            lt: `notes/summer${inc('/')}`,
        },
        v1: {
-            gt: `${DbPrefixes.Master}notes/summer0`,
-            lt: `${DbPrefixes.Master}notes/summer0`,
+            gte: `${DbPrefixes.Master}notes/summer/`,
+            lt: `${DbPrefixes.Master}notes/summer${inc('/')}`,
        },
    }, {
        Contents: [],
        CommonPrefixes: [],
        Delimiter: '/',
        IsTruncated: false,
-        NextContinuationToken: undefined,
-    }),
+        NextMarker: undefined,
+    }, (e, input) => e.key > input.startAfter),
    new Test('bad continuation token and good prefix', {
        delimiter: '/',
        prefix: 'notes/summer/',
        continuationToken: 'notes/summer0',
-        v2: true,
    }, {
        v0: {
-            gt: 'notes/summer0',
-            lt: 'notes/summer0',
+            gte: 'notes/summer/',
+            lt: `notes/summer${inc('/')}`,
        },
        v1: {
-            gt: `${DbPrefixes.Master}notes/summer0`,
-            lt: `${DbPrefixes.Master}notes/summer0`,
+            gte: `${DbPrefixes.Master}notes/summer/`,
+            lt: `${DbPrefixes.Master}notes/summer${inc('/')}`,
        },
    }, {
        Contents: [],
        CommonPrefixes: [],
        Delimiter: '/',
        IsTruncated: false,
-        NextContinuationToken: undefined,
-    }),
+        NextMarker: undefined,
+    }, (e, input) => e.key > input.continuationToken),

    new Test('no delimiter v2', {
        startAfter: 'notes/year.txt',
@ -573,9 +559,9 @@ const tests = [
        Delimiter: undefined,
        IsTruncated: true,
        NextContinuationToken: 'notes/yore.rs',
-    }),
+    }, (e, input) => e.key > input.startAfter),

-    new Test('all parameters v2 1/5', {
+    new Test('all parameters v2 1/6', {
        delimiter: '/',
        prefix: 'notes/',
        startAfter: 'notes/',
@ -584,11 +570,11 @@ const tests = [
    }, {
        v0: {
            gt: 'notes/',
-            lt: 'notes0',
+            lt: `notes${inc('/')}`,
        },
        v1: {
            gt: `${DbPrefixes.Master}notes/`,
-            lt: `${DbPrefixes.Master}notes0`,
+            lt: `${DbPrefixes.Master}notes${inc('/')}`,
        },
    }, {
        Contents: [],
@ -596,9 +582,9 @@ const tests = [
        Delimiter: '/',
        IsTruncated: true,
        NextContinuationToken: 'notes/spring/',
-    }),
+    }, (e, input) => e.key > input.startAfter),

-    new Test('all parameters v2 2/5', {
+    new Test('all parameters v2 2/6', {
        delimiter: '/',
        prefix: 'notes/',
        continuationToken: 'notes/spring/',
@ -606,12 +592,12 @@ const tests = [
        v2: true,
    }, {
        v0: {
-            gte: 'notes/spring0',
-            lt: 'notes0',
+            gt: 'notes/spring/',
+            lt: `notes${inc('/')}`,
        },
        v1: {
-            gte: `${DbPrefixes.Master}notes/spring0`,
-            lt: `${DbPrefixes.Master}notes0`,
+            gt: `${DbPrefixes.Master}notes/spring/`,
+            lt: `${DbPrefixes.Master}notes${inc('/')}`,
        },
    }, {
        Contents: [],
@ -619,7 +605,7 @@ const tests = [
        Delimiter: '/',
        IsTruncated: true,
        NextContinuationToken: 'notes/summer/',
-    }),
+    }, (e, input) => e.key > input.continuationToken),

    new Test('all parameters v2 3/5', {
        delimiter: '/',
@ -629,12 +615,12 @@ const tests = [
        v2: true,
    }, {
        v0: {
-            gte: 'notes/summer0',
-            lt: 'notes0',
+            gt: 'notes/summer/',
+            lt: `notes${inc('/')}`,
        },
        v1: {
-            gte: `${DbPrefixes.Master}notes/summer0`,
-            lt: `${DbPrefixes.Master}notes0`,
+            gt: `${DbPrefixes.Master}notes/summer/`,
+            lt: `${DbPrefixes.Master}notes${inc('/')}`,
        },
    }, {
        Contents: [
@ -644,7 +630,7 @@ const tests = [
        Delimiter: '/',
        IsTruncated: true,
        NextContinuationToken: 'notes/year.txt',
-    }),
+    }, (e, input) => e.key > input.continuationToken),

    new Test('all parameters v2 4/5', {
        delimiter: '/',
@ -655,11 +641,11 @@ const tests = [
    }, {
        v0: {
            gt: 'notes/year.txt',
-            lt: 'notes0',
+            lt: `notes${inc('/')}`,
        },
        v1: {
            gt: `${DbPrefixes.Master}notes/year.txt`,
-            lt: `${DbPrefixes.Master}notes0`,
+            lt: `${DbPrefixes.Master}notes${inc('/')}`,
        },
    }, {
        Contents: [
@ -669,7 +655,7 @@ const tests = [
        Delimiter: '/',
        IsTruncated: true,
        NextContinuationToken: 'notes/yore.rs',
-    }),
+    }, (e, input) => e.key > input.startAfter),

    new Test('all parameters v2 5/5', {
        delimiter: '/',
@ -680,11 +666,11 @@ const tests = [
    }, {
        v0: {
            gt: 'notes/yore.rs',
-            lt: 'notes0',
+            lt: `notes${inc('/')}`,
        },
        v1: {
            gt: `${DbPrefixes.Master}notes/yore.rs`,
-            lt: `${DbPrefixes.Master}notes0`,
+            lt: `${DbPrefixes.Master}notes${inc('/')}`,
        },
    }, {
        Contents: [],
@ -692,11 +678,35 @@ const tests = [
        Delimiter: '/',
        IsTruncated: false,
        NextContinuationToken: undefined,
-    }),
+    }, (e, input) => e.key > input.startAfter),
+
 ];

-function getTestListing(mdParams, data, vFormat) {
+const alphabeticalOrderTests = [
+    {
+        params: {},
+        expectedValue: true,
+    }, {
+        params: {
+            alphabeticalOrder: undefined,
+        },
+        expectedValue: true,
+    }, {
+        params: {
+            alphabeticalOrder: true,
+        },
+        expectedValue: true,
+    }, {
+        params: {
+            alphabeticalOrder: false,
+        },
+        expectedValue: false,
+    },
+];
+
+function getTestListing(test, data, vFormat) {
    return data
+        .filter(e => test.filter(e, test.input))
        .map(obj => {
            if (vFormat === 'v0') {
                return obj;
@ -708,12 +718,7 @@ function getTestListing(mdParams, data, vFormat) {
                };
            }
            return assert.fail(`bad format ${vFormat}`);
-        })
-        .filter(e =>
-            (!mdParams.gt || e.key > mdParams.gt) &&
-            (!mdParams.gte || e.key >= mdParams.gte) &&
-            (!mdParams.lt || e.key < mdParams.lt),
-        );
+        });
 }

 ['v0', 'v1'].forEach(vFormat => {
@ -727,7 +732,16 @@ function getTestListing(mdParams, data, vFormat) {
                });
            }
            assert.strictEqual(delimiter.skipping(),
-                `${vFormat === 'v1' ? DbPrefixes.Master : ''}foo0`);
+                `${vFormat === 'v1' ? DbPrefixes.Master : ''}foo/`);
+        });
+
+        it('Should set Delimiter alphabeticalOrder field to the expected value', () => {
+            alphabeticalOrderTests.forEach(test => {
+                const delimiter = new Delimiter(test.params);
+                assert.strictEqual(delimiter.alphabeticalOrder,
+                    test.expectedValue,
+                    `${JSON.stringify(test.params)}`);
+            });
        });

        tests.forEach(test => {
@ -737,13 +751,9 @@ function getTestListing(mdParams, data, vFormat) {
                assert.deepStrictEqual(params, test.genMDParams[vFormat]);
            });
            it(`Should list ${test.name}`, () => {
-                const listing = new Delimiter(test.input, logger, vFormat);
-                const mdParams = listing.genMDParams();
-                const rawEntries = getTestListing(mdParams, data, vFormat);
-                for (const entry of rawEntries) {
-                    listing.filter(entry);
-                }
-                const res = listing.result();
+                // Simulate skip scan done by LevelDB
+                const d = getTestListing(test, data, vFormat);
+                const res = performListing(d, Delimiter, test.input, logger, vFormat);
                assert.deepStrictEqual(res, test.output);
            });
        });
@ -752,16 +762,49 @@ function getTestListing(mdParams, data, vFormat) {
        if (vFormat === 'v0') {
            tests.forEach(test => {
                it(`Should list master versions ${test.name}`, () => {
-                    const listing = new DelimiterMaster(test.input, logger, vFormat);
-                    const mdParams = listing.genMDParams();
-                    const rawEntries = getTestListing(mdParams, dataVersioned, vFormat);
-                    for (const entry of rawEntries) {
-                        listing.filter(entry);
-                    }
-                    const res = listing.result();
+                    // Simulate skip scan done by LevelDB
+                    const d = dataVersioned.filter(e => test.filter(e, test.input));
+                    const res = performListing(d, DelimiterMaster, test.input, logger, vFormat);
                    assert.deepStrictEqual(res, test.output);
                });
            });
        }
+
+        it('Should filter values according to alphabeticalOrder parameter', () => {
+            let test = new Test('alphabeticalOrder parameter set', {
+                delimiter: '/',
+                alphabeticalOrder: true,
+            }, {
+            }, {
+                Contents: [
+                    receivedNonAlphaData[0],
+                ],
+                Delimiter: '/',
+                CommonPrefixes: [],
+                IsTruncated: false,
+                NextMarker: undefined,
+            });
+            let d = getTestListing(test, nonAlphabeticalData, vFormat);
+            let res = performListing(d, Delimiter, test.input, logger, vFormat);
+            assert.deepStrictEqual(res, test.output);
+
+            test = new Test('alphabeticalOrder parameter set', {
+                delimiter: '/',
+                alphabeticalOrder: false,
+            }, {
+            }, {
+                Contents: [
+                    receivedNonAlphaData[0],
+                    receivedNonAlphaData[1],
+                ],
+                Delimiter: '/',
+                CommonPrefixes: [],
+                IsTruncated: false,
+                NextMarker: undefined,
+            });
+            d = getTestListing(test, nonAlphabeticalData, vFormat);
+            res = performListing(d, Delimiter, test.input, logger, vFormat);
+            assert.deepStrictEqual(res, test.output);
+        });
    });
 });
--- a/tests/unit/algos/list/delimiterCurrent.spec.js
+++ b/tests/unit/algos/list/delimiterCurrent.spec.js
@ -6,12 +6,19 @@ const DelimiterCurrent =
    require('../../../../lib/algos/list/delimiterCurrent').DelimiterCurrent;
 const {
    FILTER_ACCEPT,
+    FILTER_SKIP,
    FILTER_END,
 } = require('../../../../lib/algos/list/tools');
 const VSConst =
    require('../../../../lib/versioning/constants').VersioningConstants;
 const { DbPrefixes } = VSConst;

+const VID_SEP = VSConst.VersionId.Separator;
+const EmptyResult = {
+    Contents: [],
+    IsTruncated: false,
+};
+
 const fakeLogger = {
    trace: () => {},
    debug: () => {},
@ -21,410 +28,101 @@ const fakeLogger = {
    fatal: () => {},
 };

-function getListingKey(key, vFormat) {
-    if (vFormat === 'v0') {
-        return key;
-    }
-    if (vFormat === 'v1') {
-        return `${DbPrefixes.Master}${key}`;
-    }
-    return assert.fail(`bad vFormat ${vFormat}`);
+function makeV1Key(key) {
+    const keyPrefix = key.includes(VID_SEP) ?
+        DbPrefixes.Version : DbPrefixes.Master;
+    return `${keyPrefix}${key}`;
 }

-['v0', 'v1'].forEach(v => {
-    describe(`DelimiterCurrent with ${v} bucket format`, () => {
-        it('should return expected metadata parameters', () => {
-            const prefix = 'pre';
-            const marker = 'premark';
-            const beforeDate = '1970-01-01T00:00:00.005Z';
-            const excludedDataStoreName = 'location1';
-            const maxScannedLifecycleListingEntries = 2;
-            const delimiter = new DelimiterCurrent({
-                prefix,
-                marker,
-                beforeDate,
-                excludedDataStoreName,
-                maxScannedLifecycleListingEntries,
-            }, fakeLogger, v);
+describe('DelimiterCurrent', () => {
+    it('should accept entry starting with prefix', () => {
+        const delimiter = new DelimiterCurrent({ prefix: 'prefix' }, fakeLogger, 'v1');

-            const expectedParams = {
-                dataStoreName: {
-                    ne: excludedDataStoreName,
+        const masterKey = 'prefix1';
+        const date1 = '1970-01-01T00:00:00.001Z';
+        const value1 = `{"last-modified": "${date1}"}`;
+        assert.strictEqual(delimiter.filter({ key: makeV1Key(masterKey), value: value1 }), FILTER_ACCEPT);
+
+        const expectedResult = {
+            Contents: [
+                {
+                    key: masterKey,
+                    value: value1,
                },
-                lastModified: {
-                    lt: beforeDate,
+            ],
+            IsTruncated: false,
+        };
+
+        assert.deepStrictEqual(delimiter.result(), expectedResult);
+    });
+
+    it('should skip entry not starting with prefix', () => {
+        const delimiter = new DelimiterCurrent({ prefix: 'prefix' }, fakeLogger, 'v1');
+
+        const listingKey = makeV1Key('noprefix');
+        assert.strictEqual(delimiter.filter({ key: listingKey, value: '' }), FILTER_SKIP);
+
+        assert.deepStrictEqual(delimiter.result(), EmptyResult);
+    });
+
+    it('should accept a master and return it', () => {
+        const delimiter = new DelimiterCurrent({ }, fakeLogger, 'v1');
+
+        const masterKey = 'key';
+
+        const date1 = '1970-01-01T00:00:00.001Z';
+        const value1 = `{"last-modified": "${date1}"}`;
+
+        assert.strictEqual(delimiter.filter({
+            key: makeV1Key(masterKey),
+            value: value1,
+        }), FILTER_ACCEPT);
+
+        const expectedResult = {
+            Contents: [
+                {
+                    key: masterKey,
+                    value: value1,
                },
-                gt: getListingKey('premark', v),
-                lt: getListingKey('prf', v),
-            };
-            assert.deepStrictEqual(delimiter.genMDParams(), expectedParams);
-            assert.strictEqual(delimiter.maxScannedLifecycleListingEntries, 2);
-        });
-
-        it('should accept entry starting with prefix', () => {
-            const delimiter = new DelimiterCurrent({ prefix: 'prefix' }, fakeLogger, v);
-
-            const masterKey = 'prefix1';
-            const date1 = '1970-01-01T00:00:00.001Z';
-            const value1 = `{"last-modified": "${date1}"}`;
-            assert.strictEqual(delimiter.filter({ key: getListingKey(masterKey, v), value: value1 }), FILTER_ACCEPT);
-
-            const expectedResult = {
-                Contents: [
-                    {
-                        key: masterKey,
-                        value: value1,
-                    },
-                ],
-                IsTruncated: false,
-            };
-
-            assert.deepStrictEqual(delimiter.result(), expectedResult);
-        });
-
-        it('should accept a master and return it', () => {
-            const delimiter = new DelimiterCurrent({ }, fakeLogger, v);
-
-            const masterKey = 'key';
-
-            const date1 = '1970-01-01T00:00:00.001Z';
-            const value1 = `{"last-modified": "${date1}"}`;
-
-            assert.strictEqual(delimiter.filter({
-                key: getListingKey(masterKey, v),
-                value: value1,
-            }), FILTER_ACCEPT);
-
-            const expectedResult = {
-                Contents: [
-                    {
-                        key: masterKey,
-                        value: value1,
-                    },
-                ],
-                IsTruncated: false,
-            };
-
-            assert.deepStrictEqual(delimiter.result(), expectedResult);
-        });
-
-        it('should accept the first master and return the truncated content', () => {
-            const delimiter = new DelimiterCurrent({ maxKeys: 1 }, fakeLogger, v);
-
-            const masterKey1 = 'key1';
-            const date1 = '1970-01-01T00:00:00.001Z';
-            const value1 = `{"last-modified": "${date1}"}`;
-
-            assert.strictEqual(delimiter.filter({
-                key: getListingKey(masterKey1, v),
-                value: value1,
-            }), FILTER_ACCEPT);
-
-            const masterKey2 = 'key2';
-            const date2 = '1970-01-01T00:00:00.000Z';
-            const value2 = `{"last-modified": "${date2}"}`;
-
-            assert.strictEqual(delimiter.filter({
-                key: getListingKey(masterKey2, v),
-                value: value2,
-            }), FILTER_END);
-
-            const expectedResult = {
-                Contents: [
-                    {
-                        key: masterKey1,
-                        value: value1,
-                    },
-                ],
-                NextMarker: masterKey1,
-                IsTruncated: true,
-            };
-
-            assert.deepStrictEqual(delimiter.result(), expectedResult);
-        });
-
-        it('should return the object created before beforeDate', () => {
-            const beforeDate = '1970-01-01T00:00:00.003Z';
-            const delimiter = new DelimiterCurrent({ beforeDate }, fakeLogger, v);
-
-            const masterKey1 = 'key1';
-            const date1 = '1970-01-01T00:00:00.004Z';
-            const value1 = `{"last-modified": "${date1}"}`;
-
-            assert.strictEqual(delimiter.filter({
-                key: getListingKey(masterKey1, v),
-                value: value1,
-            }), FILTER_ACCEPT);
-
-            const masterKey2 = 'key2';
-            const date2 = '1970-01-01T00:00:00.000Z';
-            const value2 = `{"last-modified": "${date2}"}`;
-
-            assert.strictEqual(delimiter.filter({
-                key: getListingKey(masterKey2, v),
-                value: value2,
-            }), FILTER_ACCEPT);
-
-            const expectedResult = {
-                Contents: [
-                    {
-                        key: masterKey2,
-                        value: value2,
-                    },
-                ],
-                IsTruncated: false,
-            };
-
-            assert.deepStrictEqual(delimiter.result(), expectedResult);
-        });
-
-        it('should return an empty list if last-modified is an empty string', () => {
-            const beforeDate = '1970-01-01T00:00:00.003Z';
-            const delimiter = new DelimiterCurrent({ beforeDate }, fakeLogger, v);
-
-            const masterKey0 = 'key0';
-            const value0 = '{"last-modified": ""}';
-
-            assert.strictEqual(delimiter.filter({
-                key: getListingKey(masterKey0, v),
-                value: value0,
-            }), FILTER_ACCEPT);
-
-            const expectedResult = {
-                Contents: [],
-                IsTruncated: false,
-            };
-
-            assert.deepStrictEqual(delimiter.result(), expectedResult);
-        });
-
-        it('should return an empty list if last-modified is undefined', () => {
-            const beforeDate = '1970-01-01T00:00:00.003Z';
-            const delimiter = new DelimiterCurrent({ beforeDate }, fakeLogger, v);
-
-            const masterKey0 = 'key0';
-            const value0 = '{}';
-
-            assert.strictEqual(delimiter.filter({
-                key: getListingKey(masterKey0, v),
-                value: value0,
-            }), FILTER_ACCEPT);
-
-            const expectedResult = {
-                Contents: [],
-                IsTruncated: false,
-            };
-
-            assert.deepStrictEqual(delimiter.result(), expectedResult);
-        });
-
-        it('should return the object with dataStore name that does not match', () => {
-            const beforeDate = '1970-01-01T00:00:00.005Z';
-            const excludedDataStoreName = 'location-excluded';
-            const delimiter = new DelimiterCurrent({ beforeDate, excludedDataStoreName }, fakeLogger, v);
-
-            const masterKey1 = 'key1';
-            const date1 = '1970-01-01T00:00:00.004Z';
-            const value1 = `{"last-modified": "${date1}", "dataStoreName": "valid"}`;
-
-            assert.strictEqual(delimiter.filter({
-                key: getListingKey(masterKey1, v),
-                value: value1,
-            }), FILTER_ACCEPT);
-
-            const masterKey2 = 'key2';
-            const date2 = '1970-01-01T00:00:00.000Z';
-            const value2 = `{"last-modified": "${date2}", "dataStoreName": "${excludedDataStoreName}"}`;
-
-            assert.strictEqual(delimiter.filter({
-                key: getListingKey(masterKey2, v),
-                value: value2,
-            }), FILTER_ACCEPT);
-
-            const expectedResult = {
-                Contents: [
-                    {
-                        key: masterKey1,
-                        value: value1,
-                    },
-                ],
-                IsTruncated: false,
-            };
-
-            assert.deepStrictEqual(delimiter.result(), expectedResult);
-        });
-
-        it('should stop fetching entries if the max keys are reached and return the accurate next marker', () => {
-            const beforeDate = '1970-01-01T00:00:00.005Z';
-            const excludedDataStoreName = 'location-excluded';
-            const delimiter = new DelimiterCurrent({ beforeDate, excludedDataStoreName, maxKeys: 1 }, fakeLogger, v);
-
-            const masterKey1 = 'key1';
-            const date1 = '1970-01-01T00:00:00.004Z';
-            const value1 = `{"last-modified": "${date1}", "dataStoreName": "valid"}`;
-
-            assert.strictEqual(delimiter.filter({
-                key: getListingKey(masterKey1, v),
-                value: value1,
-            }), FILTER_ACCEPT);
-
-            const masterKey2 = 'key2';
-            const date2 = '1970-01-01T00:00:00.000Z';
-            const value2 = `{"last-modified": "${date2}", "dataStoreName": "${excludedDataStoreName}"}`;
-
-            assert.strictEqual(delimiter.filter({
-                key: getListingKey(masterKey2, v),
-                value: value2,
-            }), FILTER_END);
-
-            const expectedResult = {
-                Contents: [
-                    {
-                        key: masterKey1,
-                        value: value1,
-                    },
-                ],
-                IsTruncated: true,
-                NextMarker: masterKey1,
-            };
-
-            assert.deepStrictEqual(delimiter.result(), expectedResult);
-        });
-
-        it('should return the object created before beforeDate and with dataStore name that does not match', () => {
-            const beforeDate = '1970-01-01T00:00:00.003Z';
-            const excludedDataStoreName = 'location-excluded';
-            const delimiter = new DelimiterCurrent({ beforeDate, excludedDataStoreName }, fakeLogger, v);
-
-            const masterKey1 = 'key1';
-            const date1 = '1970-01-01T00:00:00.004Z';
-            const value1 = `{"last-modified": "${date1}", "dataStoreName": "valid"}`;
-
-            assert.strictEqual(delimiter.filter({
-                key: getListingKey(masterKey1, v),
-                value: value1,
-            }), FILTER_ACCEPT);
-
-            const masterKey2 = 'key2';
-            const date2 = '1970-01-01T00:00:00.001Z';
-            const value2 = `{"last-modified": "${date2}", "dataStoreName": "valid"}`;
-
-            assert.strictEqual(delimiter.filter({
-                key: getListingKey(masterKey2, v),
-                value: value2,
-            }), FILTER_ACCEPT);
-
-            const masterKey3 = 'key3';
-            const date3 = '1970-01-01T00:00:00.000Z';
-            const value3 = `{"last-modified": "${date3}", "dataStoreName": "${excludedDataStoreName}"}`;
-
-            assert.strictEqual(delimiter.filter({
-                key: getListingKey(masterKey3, v),
-                value: value3,
-            }), FILTER_ACCEPT);
-
-            const expectedResult = {
-                Contents: [
-                    {
-                        key: masterKey2,
-                        value: value2,
-                    },
-                ],
-                IsTruncated: false,
-            };
-
-            assert.deepStrictEqual(delimiter.result(), expectedResult);
-        });
-
-        it('should return the objects pushed before max scanned entries value is reached', () => {
-            const beforeDate = '1970-01-01T00:00:00.003Z';
-            const maxScannedLifecycleListingEntries = 2;
-            const delimiter = new DelimiterCurrent({ beforeDate, maxScannedLifecycleListingEntries }, fakeLogger, v);
-
-            const masterKey1 = 'key1';
-            const date1 = '1970-01-01T00:00:00.000Z';
-            const value1 = `{"last-modified": "${date1}"}`;
-
-            assert.strictEqual(delimiter.filter({
-                key: getListingKey(masterKey1, v),
-                value: value1,
-            }), FILTER_ACCEPT);
-
-            const masterKey2 = 'key2';
-            const date2 = '1970-01-01T00:00:00.001Z';
-            const value2 = `{"last-modified": "${date2}"}`;
-
-            assert.strictEqual(delimiter.filter({
-                key: getListingKey(masterKey2, v),
-                value: value2,
-            }), FILTER_ACCEPT);
-
-            const masterKey3 = 'key3';
-            const date3 = '1970-01-01T00:00:00.002Z';
-            const value3 = `{"last-modified": "${date3}"}`;
-
-            assert.strictEqual(delimiter.filter({
-                key: getListingKey(masterKey3, v),
-                value: value3,
-            }), FILTER_END);
-
-            const expectedResult = {
-                Contents: [
-                    {
-                        key: masterKey1,
-                        value: value1,
-                    },
-                    {
-                        key: masterKey2,
-                        value: value2,
-                    },
-                ],
-                NextMarker: masterKey2,
-                IsTruncated: true,
-            };
-
-            assert.deepStrictEqual(delimiter.result(), expectedResult);
-        });
-
-        it('should return empty content after max scanned entries value is reached', () => {
-            const beforeDate = '1970-01-01T00:00:00.003Z';
-            const maxScannedLifecycleListingEntries = 2;
-            const delimiter = new DelimiterCurrent({ beforeDate, maxScannedLifecycleListingEntries }, fakeLogger, v);
-
-            const masterKey1 = 'key1';
-            const date1 = '1970-01-01T00:00:00.004Z';
-            const value1 = `{"last-modified": "${date1}"}`;
-
-            assert.strictEqual(delimiter.filter({
-                key: getListingKey(masterKey1, v),
-                value: value1,
-            }), FILTER_ACCEPT);
-
-            const masterKey2 = 'key2';
-            const date2 = '1970-01-01T00:00:00.005Z';
-            const value2 = `{"last-modified": "${date2}"}`;
-
-            assert.strictEqual(delimiter.filter({
-                key: getListingKey(masterKey2, v),
-                value: value2,
-            }), FILTER_ACCEPT);
-
-            const masterKey3 = 'key3';
-            const date3 = '1970-01-01T00:00:00.006Z';
-            const value3 = `{"last-modified": "${date3}"}`;
-
-            assert.strictEqual(delimiter.filter({
-                key: getListingKey(masterKey3, v),
-                value: value3,
-            }), FILTER_END);
-
-            const expectedResult = {
-                Contents: [],
-                NextMarker: masterKey2,
-                IsTruncated: true,
-            };
-
-            assert.deepStrictEqual(delimiter.result(), expectedResult);
-        });
+            ],
+            IsTruncated: false,
+        };
+
+        assert.deepStrictEqual(delimiter.result(), expectedResult);
+    });
+
+    it('should accept the first master and return the truncated content', () => {
+        const delimiter = new DelimiterCurrent({ maxKeys: 1 }, fakeLogger, 'v1');
+
+        const masterKey1 = 'key1';
+        const date1 = '1970-01-01T00:00:00.001Z';
+        const value1 = `{"last-modified": "${date1}"}`;
+
+        assert.strictEqual(delimiter.filter({
+            key: makeV1Key(masterKey1),
+            value: value1,
+        }), FILTER_ACCEPT);
+
+        const masterKey2 = 'key2';
+        const date2 = '1970-01-01T00:00:00.000Z';
+        const value2 = `{"last-modified": "${date2}"}`;
+
+        assert.strictEqual(delimiter.filter({
+            key: makeV1Key(masterKey2),
+            value: value2,
+        }), FILTER_END);
+
+        const expectedResult = {
+            Contents: [
+                {
+                    key: masterKey1,
+                    value: value1,
+                },
+            ],
+            NextMarker: masterKey1,
+            IsTruncated: true,
+        };
+
+        assert.deepStrictEqual(delimiter.result(), expectedResult);
    });
 });
--- a/tests/unit/algos/list/delimiterMaster.spec.js
+++ b/tests/unit/algos/list/delimiterMaster.spec.js
@ -0,0 +1,495 @@
+'use strict'; // eslint-disable-line strict
+
+const assert = require('assert');
+
+const DelimiterMaster =
+    require('../../../../lib/algos/list/delimiterMaster').DelimiterMaster;
+const {
+    FILTER_ACCEPT,
+    FILTER_SKIP,
+    SKIP_NONE,
+    inc,
+} = require('../../../../lib/algos/list/tools');
+const VSConst =
+    require('../../../../lib/versioning/constants').VersioningConstants;
+const Version = require('../../../../lib/versioning/Version').Version;
+const { generateVersionId } = require('../../../../lib/versioning/VersionID');
+const { DbPrefixes } = VSConst;
+const zpad = require('../../helpers').zpad;
+
+
+const VID_SEP = VSConst.VersionId.Separator;
+const EmptyResult = {
+    CommonPrefixes: [],
+    Contents: [],
+    IsTruncated: false,
+    NextMarker: undefined,
+    Delimiter: undefined,
+};
+
+const fakeLogger = {
+    trace: () => {},
+    debug: () => {},
+    info: () => {},
+    warn: () => {},
+    error: () => {},
+    fatal: () => {},
+};
+
+function getListingKey(key, vFormat) {
+    if (vFormat === 'v0') {
+        return key;
+    }
+    if (vFormat === 'v1') {
+        return `${DbPrefixes.Master}${key}`;
+    }
+    return assert.fail(`bad vFormat ${vFormat}`);
+}
+
+['v0', 'v1'].forEach(vFormat => {
+    describe(`Delimiter All masters listing algorithm vFormat=${vFormat}`, () => {
+        it('should return SKIP_NONE for DelimiterMaster when both NextMarker ' +
+        'and NextContinuationToken are undefined', () => {
+            const delimiter = new DelimiterMaster({ delimiter: '/' }, fakeLogger, vFormat);
+
+            assert.strictEqual(delimiter.NextMarker, undefined);
+
+            // When there is no NextMarker or NextContinuationToken, it should
+            // return SKIP_NONE
+            assert.strictEqual(delimiter.skipping(), SKIP_NONE);
+        });
+
+        it('should return <key><VersionIdSeparator> for DelimiterMaster when ' +
+        'NextMarker is set and there is a delimiter', () => {
+            const key = 'key';
+            const delimiter = new DelimiterMaster({ delimiter: '/', marker: key },
+                fakeLogger, vFormat);
+
+            /* Filter a master version to set NextMarker. */
+            const listingKey = getListingKey(key, vFormat);
+            delimiter.filter({ key: listingKey, value: '' });
+            assert.strictEqual(delimiter.NextMarker, key);
+
+            /* With a delimiter skipping should return previous key + VID_SEP
+             * (except when a delimiter is set and the NextMarker ends with the
+             * delimiter) . */
+            assert.strictEqual(delimiter.skipping(), listingKey + VID_SEP);
+        });
+
+        it('should return <key><VersionIdSeparator> for DelimiterMaster when ' +
+        'NextContinuationToken is set and there is a delimiter', () => {
+            const key = 'key';
+            const delimiter = new DelimiterMaster(
+                { delimiter: '/', startAfter: key, v2: true },
+                fakeLogger, vFormat);
+
+            // Filter a master version to set NextContinuationToken
+            const listingKey = getListingKey(key, vFormat);
+            delimiter.filter({ key: listingKey, value: '' });
+            assert.strictEqual(delimiter.NextContinuationToken, key);
+
+            assert.strictEqual(delimiter.skipping(), listingKey + VID_SEP);
+        });
+
+        it('should return NextMarker for DelimiterMaster when NextMarker is set' +
+        ', there is a delimiter and the key ends with the delimiter', () => {
+            const delimiterChar = '/';
+            const keyWithEndingDelimiter = `key${delimiterChar}`;
+            const delimiter = new DelimiterMaster({
+                delimiter: delimiterChar,
+                marker: keyWithEndingDelimiter,
+            }, fakeLogger, vFormat);
+
+            /* When a delimiter is set and the NextMarker ends with the
+             * delimiter it should return the next marker value. */
+            assert.strictEqual(delimiter.NextMarker, keyWithEndingDelimiter);
+            const skipKey = vFormat === 'v1' ?
+                `${DbPrefixes.Master}${keyWithEndingDelimiter}` :
+                keyWithEndingDelimiter;
+            assert.strictEqual(delimiter.skipping(), skipKey);
+        });
+
+        it('should skip entries not starting with prefix', () => {
+            const delimiter = new DelimiterMaster({ prefix: 'prefix' }, fakeLogger, vFormat);
+
+            const listingKey = getListingKey('wrong', vFormat);
+            assert.strictEqual(delimiter.filter({ key: listingKey }), FILTER_SKIP);
+            assert.strictEqual(delimiter.NextMarker, undefined);
+            assert.strictEqual(delimiter.prvKey, undefined);
+            assert.deepStrictEqual(delimiter.result(), EmptyResult);
+        });
+
+        it('should skip entries inferior to next marker', () => {
+            const delimiter = new DelimiterMaster({ marker: 'b' }, fakeLogger, vFormat);
+
+            const listingKey = getListingKey('a', vFormat);
+            assert.strictEqual(delimiter.filter({ key: listingKey }), FILTER_SKIP);
+            assert.strictEqual(delimiter.NextMarker, 'b');
+            assert.strictEqual(delimiter.prvKey, undefined);
+            assert.deepStrictEqual(delimiter.result(), EmptyResult);
+        });
+
+        it('should accept a master version', () => {
+            const delimiter = new DelimiterMaster({}, fakeLogger, vFormat);
+            const key = 'key';
+            const value = '';
+
+            const listingKey = getListingKey(key, vFormat);
+            assert.strictEqual(delimiter.filter({ key: listingKey, value }), FILTER_ACCEPT);
+            if (vFormat === 'v0') {
+                assert.strictEqual(delimiter.prvKey, key);
+            }
+            assert.strictEqual(delimiter.NextMarker, key);
+            assert.deepStrictEqual(delimiter.result(), {
+                CommonPrefixes: [],
+                Contents: [{ key, value }],
+                IsTruncated: false,
+                NextMarker: undefined,
+                Delimiter: undefined,
+            });
+        });
+
+        it('should return good values for entries with different common prefixes', () => {
+            const delimiterChar = '/';
+            const commonPrefix1 = `commonPrefix1${delimiterChar}`;
+            const commonPrefix2 = `commonPrefix2${delimiterChar}`;
+            const prefix1Key1 = `${commonPrefix1}key1`;
+            const prefix1Key2 = `${commonPrefix1}key2`;
+            const prefix2Key1 = `${commonPrefix2}key1`;
+            const value = 'value';
+
+            const delimiter = new DelimiterMaster({ delimiter: delimiterChar },
+                fakeLogger, vFormat);
+
+            /* Filter the first entry with a common prefix. It should be
+             * accepted and added to the result. */
+            assert.strictEqual(delimiter.filter({
+                key: getListingKey(prefix1Key1, vFormat),
+                value,
+            }),
+            FILTER_ACCEPT);
+            assert.deepStrictEqual(delimiter.result(), {
+                CommonPrefixes: [commonPrefix1],
+                Contents: [],
+                IsTruncated: false,
+                NextMarker: undefined,
+                Delimiter: delimiterChar,
+            });
+
+            /* Filter the second entry with the same common prefix than the
+             * first entry. It should be skipped and not added to the result. */
+            assert.strictEqual(delimiter.filter({
+                key: getListingKey(prefix1Key2, vFormat),
+                value,
+            }),
+            FILTER_SKIP);
+            assert.deepStrictEqual(delimiter.result(), {
+                CommonPrefixes: [commonPrefix1],
+                Contents: [],
+                IsTruncated: false,
+                NextMarker: undefined,
+                Delimiter: delimiterChar,
+            });
+
+            /* Filter an entry with a new common prefix. It should be accepted
+             * and not added to the result. */
+            assert.strictEqual(delimiter.filter({
+                key: getListingKey(prefix2Key1, vFormat),
+                value,
+            }),
+            FILTER_ACCEPT);
+            assert.deepStrictEqual(delimiter.result(), {
+                CommonPrefixes: [commonPrefix1, commonPrefix2],
+                Contents: [],
+                IsTruncated: false,
+                NextMarker: undefined,
+                Delimiter: delimiterChar,
+            });
+        });
+
+        it('should skip a delete marker version', () => {
+            const delimiter = new DelimiterMaster({}, fakeLogger, vFormat);
+            const version = new Version({ isDeleteMarker: true });
+            const key = 'key';
+            const obj = {
+                key: `${key}${VID_SEP}version`,
+                value: version.toString(),
+            };
+
+            /* When filtered, it should return FILTER_SKIP and set the prvKey if vFormat is v0. It
+             * should not be added to the result content or common prefixes. */
+            assert.strictEqual(delimiter.filter(obj), FILTER_SKIP);
+            assert.strictEqual(delimiter.NextMarker, undefined);
+            if (vFormat === 'v0') {
+                assert.strictEqual(delimiter.prvKey, key);
+            }
+            assert.deepStrictEqual(delimiter.result(), EmptyResult);
+        });
+
+        if (vFormat === 'v0') {
+            it('should accept a PHD version as first input', () => {
+                const delimiter = new DelimiterMaster({}, fakeLogger, vFormat);
+                const keyPHD = 'keyPHD';
+                const objPHD = {
+                    key: keyPHD,
+                    value: Version.generatePHDVersion(generateVersionId('', '')),
+                };
+
+                /* When filtered, it should return FILTER_ACCEPT and set the prvKey
+                 * to undefined. It should not be added to the result content or common
+                 * prefixes. */
+                assert.strictEqual(delimiter.filter(objPHD), FILTER_ACCEPT);
+                assert.strictEqual(delimiter.prvKey, undefined);
+                assert.strictEqual(delimiter.NextMarker, undefined);
+                assert.deepStrictEqual(delimiter.result(), EmptyResult);
+            });
+
+            it('should accept a PHD version', () => {
+                const delimiter = new DelimiterMaster({}, fakeLogger, vFormat);
+                const key = 'keyA';
+                const value = '';
+                const keyPHD = 'keyBPHD';
+                const objPHD = {
+                    key: keyPHD,
+                    value: Version.generatePHDVersion(generateVersionId('', '')),
+                };
+
+                /* Filter a master version to set the NextMarker, the prvKey and add
+                 * and element in result content. */
+                delimiter.filter({ key, value });
+
+                /* When filtered, it should return FILTER_ACCEPT and set the prvKey
+                 * to undefined. It should not be added to the result content or common
+                 * prefixes. */
+                assert.strictEqual(delimiter.filter(objPHD), FILTER_ACCEPT);
+                assert.strictEqual(delimiter.prvKey, undefined);
+                assert.strictEqual(delimiter.NextMarker, key);
+                assert.deepStrictEqual(delimiter.result(), {
+                    CommonPrefixes: [],
+                    Contents: [{ key, value }],
+                    IsTruncated: false,
+                    NextMarker: undefined,
+                    Delimiter: undefined,
+                });
+            });
+
+            it('should accept a version after a PHD', () => {
+                const delimiter = new DelimiterMaster({}, fakeLogger, vFormat);
+                const masterKey = 'key';
+                const keyVersion = `${masterKey}${VID_SEP}version`;
+                const value = '';
+                const objPHD = {
+                    key: masterKey,
+                    value: Version.generatePHDVersion(generateVersionId('', '')),
+                };
+
+                /* Filter the PHD object. */
+                delimiter.filter(objPHD);
+
+                /* The filtering of the PHD object has no impact, the version is
+                 * accepted and added to the result. */
+                assert.strictEqual(delimiter.filter({
+                    key: keyVersion,
+                    value,
+                }), FILTER_ACCEPT);
+                assert.strictEqual(delimiter.prvKey, masterKey);
+                assert.strictEqual(delimiter.NextMarker, masterKey);
+                assert.deepStrictEqual(delimiter.result(), {
+                    CommonPrefixes: [],
+                    Contents: [{ key: masterKey, value }],
+                    IsTruncated: false,
+                    NextMarker: undefined,
+                    Delimiter: undefined,
+                });
+            });
+
+            it('should skip version after a delete marker master', () => {
+                const delimiter = new DelimiterMaster({}, fakeLogger, vFormat);
+                const version = new Version({ isDeleteMarker: true });
+                const key = 'key';
+                const versionKey = `${key}${VID_SEP}version`;
+
+                delimiter.filter({ key, value: version.toString() });
+                assert.strictEqual(delimiter.filter({
+                    key: versionKey,
+                    value: 'value',
+                }), FILTER_SKIP);
+                assert.strictEqual(delimiter.NextMarker, undefined);
+                assert.strictEqual(delimiter.prvKey, key);
+                assert.deepStrictEqual(delimiter.result(), EmptyResult);
+            });
+
+            it('should accept a new master key after a delete marker master', () => {
+                const delimiter = new DelimiterMaster({}, fakeLogger, vFormat);
+                const version = new Version({ isDeleteMarker: true });
+                const key1 = 'key1';
+                const key2 = 'key2';
+                const value = 'value';
+
+                delimiter.filter({ key: key1, value: version.toString() });
+                assert.strictEqual(delimiter.filter({
+                    key: key2,
+                    value: 'value',
+                }), FILTER_ACCEPT);
+                assert.strictEqual(delimiter.NextMarker, key2);
+                assert.strictEqual(delimiter.prvKey, key2);
+                assert.deepStrictEqual(delimiter.result(), {
+                    CommonPrefixes: [],
+                    Contents: [{ key: key2, value }],
+                    IsTruncated: false,
+                    NextMarker: undefined,
+                    Delimiter: undefined,
+                });
+            });
+
+            it('should accept the master version and skip the other ones', () => {
+                const delimiter = new DelimiterMaster({}, fakeLogger, vFormat);
+                const masterKey = 'key';
+                const masterValue = 'value';
+                const versionKey = `${masterKey}${VID_SEP}version`;
+                const versionValue = 'versionvalue';
+
+                /* Filter the master version. */
+                delimiter.filter({ key: masterKey, value: masterValue });
+
+                /* Version is skipped, not added to the result. The delimiter
+                 * NextMarker and prvKey value are unmodified and set to the
+                 * masterKey. */
+                assert.strictEqual(delimiter.filter({
+                    key: versionKey,
+                    value: versionValue,
+                }), FILTER_SKIP);
+                assert.strictEqual(delimiter.NextMarker, masterKey);
+                assert.strictEqual(delimiter.prvKey, masterKey);
+                assert.deepStrictEqual(delimiter.result(), {
+                    CommonPrefixes: [],
+                    Contents: [{ key: masterKey, value: masterValue }],
+                    IsTruncated: false,
+                    NextMarker: undefined,
+                    Delimiter: undefined,
+                });
+            });
+
+            it('should return good listing result for version', () => {
+                const delimiter = new DelimiterMaster({}, fakeLogger, vFormat);
+                const masterKey = 'key';
+                const versionKey1 = `${masterKey}${VID_SEP}version1`;
+                const versionKey2 = `${masterKey}${VID_SEP}version2`;
+                const value2 = 'value2';
+
+                /* Filter the PHD version. */
+                assert.strictEqual(delimiter.filter({
+                    key: masterKey,
+                    value: '{ "isPHD": true, "value": "version" }',
+                }), FILTER_ACCEPT);
+
+                /* Filter a delete marker version. */
+                assert.strictEqual(delimiter.filter({
+                    key: versionKey1,
+                    value: '{ "isDeleteMarker": true }',
+                }), FILTER_ACCEPT);
+
+                /* Filter a last version with a specific value. */
+                assert.strictEqual(delimiter.filter({
+                    key: versionKey2,
+                    value: value2,
+                }), FILTER_ACCEPT);
+
+                assert.deepStrictEqual(delimiter.result(), {
+                    CommonPrefixes: [],
+                    Contents: [{ key: masterKey, value: value2 }],
+                    IsTruncated: false,
+                    NextMarker: undefined,
+                    Delimiter: undefined,
+                });
+            });
+
+            /* We test here the internal management of the prvKey field of the
+             * DelimiterMaster class, in particular once it has been set to an entry
+             * key before to finally skip this entry because of an already present
+             * common prefix. */
+            it('should accept a version after skipping an object because of its commonPrefix', () => {
+                const delimiterChar = '/';
+                const commonPrefix1 = `commonPrefix1${delimiterChar}`;
+                const commonPrefix2 = `commonPrefix2${delimiterChar}`;
+                const prefix1Key1 = `${commonPrefix1}key1`;
+                const prefix1Key2 = `${commonPrefix1}key2`;
+                const prefix2VersionKey1 = `${commonPrefix2}key1${VID_SEP}version`;
+                const value = 'value';
+
+                const delimiter = new DelimiterMaster({ delimiter: delimiterChar },
+                    fakeLogger, vFormat);
+
+                /* Filter the two first entries with the same common prefix to add
+                 * it to the result and reach the state where an entry is skipped
+                 * because of an already present common prefix in the result. */
+                delimiter.filter({ key: prefix1Key1, value });
+                delimiter.filter({ key: prefix1Key2, value });
+
+                /* Filter an object with a key containing a version part and a new
+                 * common prefix. It should be accepted and the new common prefix
+                 * added to the result. */
+                assert.strictEqual(delimiter.filter({
+                    key: prefix2VersionKey1,
+                    value,
+                }), FILTER_ACCEPT);
+                assert.deepStrictEqual(delimiter.result(), {
+                    CommonPrefixes: [commonPrefix1, commonPrefix2],
+                    Contents: [],
+                    IsTruncated: false,
+                    NextMarker: undefined,
+                    Delimiter: delimiterChar,
+                });
+            });
+
+            it('should skip a versioned entry when there is a delimiter and the key ' +
+            'starts with the NextMarker value', () => {
+                const delimiterChar = '/';
+                const commonPrefix = `commonPrefix${delimiterChar}`;
+                const key = `${commonPrefix}key${VID_SEP}version`;
+                const value = 'value';
+
+                const delimiter = new DelimiterMaster({ delimiter: delimiterChar },
+                    fakeLogger, vFormat);
+                /* TODO: should be set to a whole key instead of just a common prefix
+                 * once ZENKO-1048 is fixed. */
+                delimiter.NextMarker = commonPrefix;
+
+                assert.strictEqual(delimiter.filter({ key, value }), FILTER_SKIP);
+            });
+
+            it('should return good skipping value for DelimiterMaster on replay keys', () => {
+                const delimiter = new DelimiterMaster(
+                    { delimiter: '/', v2: true },
+                    fakeLogger, vFormat);
+
+                for (let i = 0; i < 10; i++) {
+                    delimiter.filter({
+                        key: `foo/${zpad(i)}`,
+                        value: '{}',
+                    });
+                }
+                // simulate a listing that goes through a replay key, ...
+                assert.strictEqual(
+                    delimiter.filter({
+                        key: `${DbPrefixes.Replay}xyz`,
+                        value: 'abcdef',
+                    }),
+                    FILTER_SKIP);
+                // ...it should skip the whole replay prefix
+                assert.strictEqual(delimiter.skipping(), DbPrefixes.Replay);
+
+                // simulate a listing that reaches regular object keys
+                // beyond the replay prefix, ...
+                assert.strictEqual(
+                    delimiter.filter({
+                        key: `${inc(DbPrefixes.Replay)}foo/bar`,
+                        value: '{}',
+                    }),
+                    FILTER_ACCEPT);
+                // ...it should return to skipping by prefix as usual
+                assert.strictEqual(delimiter.skipping(), `${inc(DbPrefixes.Replay)}foo/`);
+            });
+        }
+    });
+});
--- a/tests/unit/algos/list/delimiterMaster.spec.ts
+++ b/tests/unit/algos/list/delimiterMaster.spec.ts
--- a/tests/unit/algos/list/delimiterNonCurrent.spec.js
+++ b/tests/unit/algos/list/delimiterNonCurrent.spec.js
@ -6,12 +6,16 @@ const DelimiterNonCurrent =
    require('../../../../lib/algos/list/delimiterNonCurrent').DelimiterNonCurrent;
 const {
    FILTER_ACCEPT,
+    FILTER_SKIP,
    FILTER_END,
 } = require('../../../../lib/algos/list/tools');
 const VSConst =
    require('../../../../lib/versioning/constants').VersioningConstants;
 const { DbPrefixes } = VSConst;

+// TODO: find an acceptable timeout value.
+const DELIMITER_TIMEOUT_MS = 10 * 1000; // 10s
+
 const VID_SEP = VSConst.VersionId.Separator;
 const EmptyResult = {
    Contents: [],
@ -27,426 +31,342 @@ const fakeLogger = {
    fatal: () => {},
 };

-function getListingKey(key, vFormat) {
-    if (vFormat === 'v0') {
-        return key;
-    }
-    if (vFormat === 'v1') {
-        const keyPrefix = key.includes(VID_SEP) ?
-            DbPrefixes.Version : DbPrefixes.Master;
-        return `${keyPrefix}${key}`;
-    }
-    return assert.fail(`bad format ${vFormat}`);
+function makeV1Key(key) {
+    const keyPrefix = key.includes(VID_SEP) ?
+        DbPrefixes.Version : DbPrefixes.Master;
+    return `${keyPrefix}${key}`;
 }

-['v0', 'v1'].forEach(v => {
-    describe(`DelimiterNonCurrent with ${v} bucket format`, () => {
-        it('should return expected metadata parameters', () => {
-            const prefix = 'pre';
-            const keyMarker = 'premark';
-            const versionIdMarker = 'vid1';
-            const maxScannedLifecycleListingEntries = 2;
-            const delimiter = new DelimiterNonCurrent({
-                prefix,
-                keyMarker,
-                versionIdMarker,
-                maxScannedLifecycleListingEntries,
-            }, fakeLogger, v);
-
-            let expectedParams;
-            if (v === 'v0') {
-                expectedParams = { gte: `${keyMarker}${VID_SEP}`, lt: 'prf' };
-            } else {
-                expectedParams = [
-                    {
-                        gte: `${DbPrefixes.Master}${keyMarker}${VID_SEP}`,
-                        lt: `${DbPrefixes.Master}prf`,
-                    },
-                    {
-                        gte: `${DbPrefixes.Version}${keyMarker}${VID_SEP}`,
-                        lt: `${DbPrefixes.Version}prf`,
-                    },
-                ];
-            }
-            assert.deepStrictEqual(delimiter.genMDParams(), expectedParams);
-            assert.strictEqual(delimiter.maxScannedLifecycleListingEntries, 2);
-        });
-        it('should accept entry starting with prefix', () => {
-            const delimiter = new DelimiterNonCurrent({ prefix: 'prefix' }, fakeLogger, v);
-
-            const listingKey = getListingKey('prefix1', v);
-            assert.strictEqual(delimiter.filter({ key: listingKey, value: '' }), FILTER_ACCEPT);
-
-            assert.deepStrictEqual(delimiter.result(), EmptyResult);
-        });
-
-        it('should accept a version and return an empty content', () => {
-            const delimiter = new DelimiterNonCurrent({ }, fakeLogger, v);
-
-            const masterKey = 'key';
-
-            const versionId1 = 'version1';
-            const versionKey1 = `${masterKey}${VID_SEP}${versionId1}`;
-            const date1 = '1970-01-01T00:00:00.001Z';
-            const value1 = `{"versionId":"${versionId1}", "last-modified": "${date1}"}`;
-
-            assert.strictEqual(delimiter.filter({
-                key: getListingKey(versionKey1, v),
-                value: value1,
-            }), FILTER_ACCEPT);
-
-            assert.deepStrictEqual(delimiter.result(), EmptyResult);
-        });
-
-        it('should accept two versions and return the noncurrent version', () => {
-            const delimiter = new DelimiterNonCurrent({ }, fakeLogger, v);
-
-            const masterKey = 'key';
-
-            // filter first version
-            const versionId1 = 'version1';
-            const versionKey1 = `${masterKey}${VID_SEP}${versionId1}`;
-            const date1 = '1970-01-01T00:00:00.002Z';
-            const value1 = `{"versionId":"${versionId1}", "last-modified": "${date1}"}`;
-
-            assert.strictEqual(delimiter.filter({
-                key: getListingKey(versionKey1, v),
-                value: value1,
-            }), FILTER_ACCEPT);
-
-            // filter second version
-            const versionId2 = 'version2';
-            const versionKey2 = `${masterKey}${VID_SEP}${versionId2}`;
-            const date2 = '1970-01-01T00:00:00.001Z';
-            const value2 = `{"versionId":"${versionId2}", "last-modified": "${date2}"}`;
-
-            assert.strictEqual(delimiter.filter({
-                key: getListingKey(versionKey2, v),
-                value: value2,
-            }), FILTER_ACCEPT);
-
-            const expectedResult = {
-                Contents: [
-                    {
-                        key: masterKey,
-                        value: `{"versionId":"${versionId2}","last-modified":"${date2}","staleDate":"${date1}"}`,
-                    },
-                ],
-                IsTruncated: false,
-            };
-
-            assert.deepStrictEqual(delimiter.result(), expectedResult);
-        });
-
-        it('should accept three versions and return the noncurrent version which stale date before beforeDate', () => {
-            const beforeDate = '1970-01-01T00:00:00.002Z';
-            const delimiter = new DelimiterNonCurrent({ beforeDate }, fakeLogger, v);
-
-            const masterKey = 'key';
-
-            // filter first version
-            const versionId1 = 'version1';
-            const versionKey1 = `${masterKey}${VID_SEP}${versionId1}`;
-            const date1 = beforeDate;
-            const value1 = `{"versionId":"${versionId1}", "last-modified": "${date1}"}`;
-
-            assert.strictEqual(delimiter.filter({
-                key: getListingKey(versionKey1, v),
-                value: value1,
-            }), FILTER_ACCEPT);
-
-            // filter second version
-            const versionId2 = 'version2';
-            const versionKey2 = `${masterKey}${VID_SEP}${versionId2}`;
-            const date2 = '1970-01-01T00:00:00.001Z';
-            const value2 = `{"versionId":"${versionId2}", "last-modified": "${date2}"}`;
-
-            assert.strictEqual(delimiter.filter({
-                key: getListingKey(versionKey2, v),
-                value: value2,
-            }), FILTER_ACCEPT);
-
-            // filter third version
-            const versionId3 = 'version3';
-            const versionKey3 = `${masterKey}${VID_SEP}${versionId3}`;
-            const date3 = '1970-01-01T00:00:00.000Z';
-            const value3 = `{"versionId":"${versionId3}", "last-modified": "${date3}"}`;
-
-            assert.strictEqual(delimiter.filter({
-                key: getListingKey(versionKey3, v),
-                value: value3,
-            }), FILTER_ACCEPT);
-
-            const expectedResult = {
-                Contents: [
-                    {
-                        key: masterKey,
-                        value: `{"versionId":"${versionId3}","last-modified":"${date3}","staleDate":"${date2}"}`,
-                    },
-                ],
-                IsTruncated: false,
-            };
-
-            assert.deepStrictEqual(delimiter.result(), expectedResult);
-        });
-
-        it('should accept one delete marker and one version and return the noncurrent version', () => {
-            const delimiter = new DelimiterNonCurrent({ }, fakeLogger, v);
-
-            // const version = new Version({ isDeleteMarker: true });
-            const masterKey = 'key';
-
-            // filter delete marker
-            const versionId1 = 'version1';
-            const versionKey1 = `${masterKey}${VID_SEP}${versionId1}`;
-            const date1 = '1970-01-01T00:00:00.002Z';
-            const value1 = `{"versionId":"${versionId1}", "last-modified": "${date1}", "isDeleteMarker": true}`;
-
-            assert.strictEqual(delimiter.filter({
-                key: getListingKey(versionKey1, v),
-                value: value1,
-            }), FILTER_ACCEPT);
-
-            // filter second version
-            const versionId2 = 'version2';
-            const versionKey2 = `${masterKey}${VID_SEP}${versionId2}`;
-            const date2 = '1970-01-01T00:00:00.001Z';
-            const value2 = `{"versionId":"${versionId2}", "last-modified": "${date2}"}`;
-
-            assert.strictEqual(delimiter.filter({
-                key: getListingKey(versionKey2, v),
-                value: value2,
-            }), FILTER_ACCEPT);
-
-            const expectedResult = {
-                Contents: [
-                    {
-                        key: masterKey,
-                        value: `{"versionId":"${versionId2}","last-modified":"${date2}","staleDate":"${date1}"}`,
-                    },
-                ],
-                IsTruncated: false,
-            };
-
-            assert.deepStrictEqual(delimiter.result(), expectedResult);
-        });
-
-        it('should end filtering if max keys reached', () => {
-            const delimiter = new DelimiterNonCurrent({ maxKeys: 1 }, fakeLogger, v);
-
-            const masterKey = 'key';
-
-            // filter delete marker
-            const versionId1 = 'version1';
-            const versionKey1 = `${masterKey}${VID_SEP}${versionId1}`;
-            const date1 = '1970-01-01T00:00:00.002Z';
-            const value1 = `{"versionId":"${versionId1}", "last-modified": "${date1}", "isDeleteMarker": true}`;
-
-            assert.strictEqual(delimiter.filter({
-                key: getListingKey(versionKey1, v),
-                value: value1,
-            }), FILTER_ACCEPT);
-
-            // filter second version
-            const versionId2 = 'version2';
-            const versionKey2 = `${masterKey}${VID_SEP}${versionId2}`;
-            const date2 = '1970-01-01T00:00:00.001Z';
-            const value2 = `{"versionId":"${versionId2}", "last-modified": "${date2}"}`;
-
-            assert.strictEqual(delimiter.filter({
-                key: getListingKey(versionKey2, v),
-                value: value2,
-            }), FILTER_ACCEPT);
-
-            // filter third version
-            const versionId3 = 'version3';
-            const versionKey3 = `${masterKey}${VID_SEP}${versionId3}`;
-            const date3 = '1970-01-01T00:00:00.000Z';
-            const value3 = `{"versionId":"${versionId3}", "last-modified": "${date3}"}`;
-
-            assert.strictEqual(delimiter.filter({
-                key: getListingKey(versionKey3, v),
-                value: value3,
-            }), FILTER_END);
-
-
-            const expectedResult = {
-                Contents: [
-                    {
-                        key: masterKey,
-                        value: `{"versionId":"${versionId2}","last-modified":"${date2}","staleDate":"${date1}"}`,
-                    },
-                ],
-                IsTruncated: true,
-                NextKeyMarker: masterKey,
-                NextVersionIdMarker: versionId2,
-            };
-
-            assert.deepStrictEqual(delimiter.result(), expectedResult);
-        });
-
-        it('should return the non-current versions pushed before max scanned entries value is reached', () => {
-            const maxScannedLifecycleListingEntries = 2;
-            const delimiter = new DelimiterNonCurrent({ maxScannedLifecycleListingEntries }, fakeLogger, v);
-
-            const masterKey = 'key';
-
-            // filter delete marker
-            const versionId1 = 'version1';
-            const versionKey1 = `${masterKey}${VID_SEP}${versionId1}`;
-            const date1 = '1970-01-01T00:00:00.002Z';
-            const value1 = `{"versionId":"${versionId1}", "last-modified": "${date1}", "isDeleteMarker": true}`;
-
-            assert.strictEqual(delimiter.filter({
-                key: getListingKey(versionKey1, v),
-                value: value1,
-            }), FILTER_ACCEPT);
-
-            // filter second version
-            const versionId2 = 'version2';
-            const versionKey2 = `${masterKey}${VID_SEP}${versionId2}`;
-            const date2 = '1970-01-01T00:00:00.001Z';
-            const value2 = `{"versionId":"${versionId2}", "last-modified": "${date2}"}`;
-
-            assert.strictEqual(delimiter.filter({
-                key: getListingKey(versionKey2, v),
-                value: value2,
-            }), FILTER_ACCEPT);
-
-            // filter third version
-            const versionId3 = 'version3';
-            const versionKey3 = `${masterKey}${VID_SEP}${versionId3}`;
-            const date3 = '1970-01-01T00:00:00.000Z';
-            const value3 = `{"versionId":"${versionId3}", "last-modified": "${date3}"}`;
-
-            assert.strictEqual(delimiter.filter({
-                key: getListingKey(versionKey3, v),
-                value: value3,
-            }), FILTER_END);
-
-
-            const expectedResult = {
-                Contents: [
-                    {
-                        key: masterKey,
-                        value: `{"versionId":"${versionId2}","last-modified":"${date2}","staleDate":"${date1}"}`,
-                    },
-                ],
-                IsTruncated: true,
-                NextKeyMarker: masterKey,
-                NextVersionIdMarker: versionId2,
-            };
-
-            assert.deepStrictEqual(delimiter.result(), expectedResult);
-        });
-
-        it('should return empty content after max scanned entries value is reached', () => {
-            const maxScannedLifecycleListingEntries = 2;
-            const delimiter = new DelimiterNonCurrent({ maxScannedLifecycleListingEntries }, fakeLogger, v);
-
-            // filter current version
-            const masterKey1 = 'key1';
-            const versionId1 = 'version1';
-            const versionKey1 = `${masterKey1}${VID_SEP}${versionId1}`;
-            const date1 = '1970-01-01T00:00:00.002Z';
-            const value1 = `{"versionId":"${versionId1}", "last-modified": "${date1}"`;
-
-            assert.strictEqual(delimiter.filter({
-                key: getListingKey(versionKey1, v),
-                value: value1,
-            }), FILTER_ACCEPT);
-
-            // filter current version
-            const masterKey2 = 'key2';
-            const versionId2 = 'version2';
-            const versionKey2 = `${masterKey2}${VID_SEP}${versionId2}`;
-            const date2 = '1970-01-01T00:00:00.001Z';
-            const value2 = `{"versionId":"${versionId2}", "last-modified": "${date2}"}`;
-
-            assert.strictEqual(delimiter.filter({
-                key: getListingKey(versionKey2, v),
-                value: value2,
-            }), FILTER_ACCEPT);
-
-            // filter current version
-            const masterKey3 = 'key3';
-            const versionId3 = 'version3';
-            const versionKey3 = `${masterKey3}${VID_SEP}${versionId3}`;
-            const date3 = '1970-01-01T00:00:00.000Z';
-            const value3 = `{"versionId":"${versionId3}", "last-modified": "${date3}"}`;
-
-            assert.strictEqual(delimiter.filter({
-                key: getListingKey(versionKey3, v),
-                value: value3,
-            }), FILTER_END);
-
-            const expectedResult = {
-                Contents: [],
-                IsTruncated: true,
-                NextKeyMarker: masterKey2,
-                NextVersionIdMarker: versionId2,
-            };
-
-            assert.deepStrictEqual(delimiter.result(), expectedResult);
-        });
-
-        it('should return noncurrent versions starting from a marker', () => {
-            const delimiter = new DelimiterNonCurrent({
-                keyMarker: 'key',
-                versionIdMarker: 'version1',
-            }, fakeLogger, v);
-
-            const masterKey = 'key';
-
-            // filter first version
-            const versionId1 = 'version1';
-            const versionKey1 = `${masterKey}${VID_SEP}${versionId1}`;
-            const date1 = '1970-01-01T00:00:00.002Z';
-            const value1 = `{"versionId":"${versionId1}", "last-modified": "${date1}"}`;
-
-            assert.strictEqual(delimiter.filter({
-                key: getListingKey(versionKey1, v),
-                value: value1,
-            }), FILTER_ACCEPT);
-
-            // filter second version
-            const versionId2 = 'version2';
-            const versionKey2 = `${masterKey}${VID_SEP}${versionId2}`;
-            const date2 = '1970-01-01T00:00:00.001Z';
-            const value2 = `{"versionId":"${versionId2}", "last-modified": "${date2}"}`;
-
-            assert.strictEqual(delimiter.filter({
-                key: getListingKey(versionKey2, v),
-                value: value2,
-            }), FILTER_ACCEPT);
-
-            // filter third version
-            const versionId3 = 'version3';
-            const versionKey3 = `${masterKey}${VID_SEP}${versionId3}`;
-            const date3 = '1970-01-01T00:00:00.000Z';
-            const value3 = `{"versionId":"${versionId3}", "last-modified": "${date3}"}`;
-
-            assert.strictEqual(delimiter.filter({
-                key: getListingKey(versionKey3, v),
-                value: value3,
-            }), FILTER_ACCEPT);
-
-
-            const expectedResult = {
-                Contents: [
-                    {
-                        key: masterKey,
-                        value: `{"versionId":"${versionId2}","last-modified":"${date2}","staleDate":"${date1}"}`,
-                    },
-                    {
-                        key: masterKey,
-                        value: `{"versionId":"${versionId3}","last-modified":"${date3}","staleDate":"${date2}"}`,
-                    },
-                ],
-                IsTruncated: false,
-            };
-
-            assert.deepStrictEqual(delimiter.result(), expectedResult);
-        });
+describe('DelimiterNonCurrent', () => {
+    it('should accept entry starting with prefix', () => {
+        const delimiter = new DelimiterNonCurrent({ prefix: 'prefix' }, fakeLogger, 'v1');
+
+        const listingKey = makeV1Key('prefix1');
+        assert.strictEqual(delimiter.filter({ key: listingKey, value: '' }), FILTER_ACCEPT);
+
+        assert.deepStrictEqual(delimiter.result(), EmptyResult);
+    });
+
+    it('should skip entry not starting with prefix', () => {
+        const delimiter = new DelimiterNonCurrent({ prefix: 'prefix' }, fakeLogger, 'v1');
+
+        const listingKey = makeV1Key('noprefix');
+        assert.strictEqual(delimiter.filter({ key: listingKey, value: '' }), FILTER_SKIP);
+
+        assert.deepStrictEqual(delimiter.result(), EmptyResult);
+    });
+
+    it('should accept a version and return an empty content', () => {
+        const delimiter = new DelimiterNonCurrent({ }, fakeLogger, 'v1');
+
+        const masterKey = 'key';
+
+        const versionId1 = 'version1';
+        const versionKey1 = `${masterKey}${VID_SEP}${versionId1}`;
+        const date1 = '1970-01-01T00:00:00.001Z';
+        const value1 = `{"versionId":"${versionId1}", "last-modified": "${date1}"}`;
+
+        assert.strictEqual(delimiter.filter({
+            key: makeV1Key(versionKey1),
+            value: value1,
+        }), FILTER_ACCEPT);
+
+        assert.deepStrictEqual(delimiter.result(), EmptyResult);
+    });
+
+    it('should accept two versions and return the non current version', () => {
+        const delimiter = new DelimiterNonCurrent({ }, fakeLogger, 'v1');
+
+        const masterKey = 'key';
+
+        // filter first version
+        const versionId1 = 'version1';
+        const versionKey1 = `${masterKey}${VID_SEP}${versionId1}`;
+        const date1 = '1970-01-01T00:00:00.002Z';
+        const value1 = `{"versionId":"${versionId1}", "last-modified": "${date1}"}`;
+
+        assert.strictEqual(delimiter.filter({
+            key: makeV1Key(versionKey1),
+            value: value1,
+        }), FILTER_ACCEPT);
+
+        // filter second version
+        const versionId2 = 'version2';
+        const versionKey2 = `${masterKey}${VID_SEP}${versionId2}`;
+        const date2 = '1970-01-01T00:00:00.001Z';
+        const value2 = `{"versionId":"${versionId2}", "last-modified": "${date2}"}`;
+
+        assert.strictEqual(delimiter.filter({
+            key: makeV1Key(versionKey2),
+            value: value2,
+        }), FILTER_ACCEPT);
+
+        const expectedResult = {
+            Contents: [
+                {
+                    key: masterKey,
+                    value: `{"versionId":"${versionId2}","last-modified":"${date2}","staleDate":"${date1}"}`,
+                },
+            ],
+            IsTruncated: false,
+        };
+
+        assert.deepStrictEqual(delimiter.result(), expectedResult);
+    });
+
+    it('should accept three versions and return the non current version which stale date before beforeDate', () => {
+        const beforeDate = '1970-01-01T00:00:00.002Z';
+        const delimiter = new DelimiterNonCurrent({ beforeDate }, fakeLogger, 'v1');
+
+        const masterKey = 'key';
+
+        // filter first version
+        const versionId1 = 'version1';
+        const versionKey1 = `${masterKey}${VID_SEP}${versionId1}`;
+        const date1 = beforeDate;
+        const value1 = `{"versionId":"${versionId1}", "last-modified": "${date1}"}`;
+
+        assert.strictEqual(delimiter.filter({
+            key: makeV1Key(versionKey1),
+            value: value1,
+        }), FILTER_ACCEPT);
+
+        // filter second version
+        const versionId2 = 'version2';
+        const versionKey2 = `${masterKey}${VID_SEP}${versionId2}`;
+        const date2 = '1970-01-01T00:00:00.001Z';
+        const value2 = `{"versionId":"${versionId2}", "last-modified": "${date2}"}`;
+
+        assert.strictEqual(delimiter.filter({
+            key: makeV1Key(versionKey2),
+            value: value2,
+        }), FILTER_ACCEPT);
+
+        // filter third version
+        const versionId3 = 'version3';
+        const versionKey3 = `${masterKey}${VID_SEP}${versionId3}`;
+        const date3 = '1970-01-01T00:00:00.000Z';
+        const value3 = `{"versionId":"${versionId3}", "last-modified": "${date3}"}`;
+
+        assert.strictEqual(delimiter.filter({
+            key: makeV1Key(versionKey3),
+            value: value3,
+        }), FILTER_ACCEPT);
+
+        const expectedResult = {
+            Contents: [
+                {
+                    key: masterKey,
+                    value: `{"versionId":"${versionId3}","last-modified":"${date3}","staleDate":"${date2}"}`,
+                },
+            ],
+            IsTruncated: false,
+        };
+
+        assert.deepStrictEqual(delimiter.result(), expectedResult);
+    });
+
+    it('should accept one delete marker and one versions and return the non current version', () => {
+        const delimiter = new DelimiterNonCurrent({ }, fakeLogger, 'v1');
+
+        // const version = new Version({ isDeleteMarker: true });
+        const masterKey = 'key';
+
+        // filter delete marker
+        const versionId1 = 'version1';
+        const versionKey1 = `${masterKey}${VID_SEP}${versionId1}`;
+        const date1 = '1970-01-01T00:00:00.002Z';
+        const value1 = `{"versionId":"${versionId1}", "last-modified": "${date1}", "isDeleteMarker": true}`;
+
+        assert.strictEqual(delimiter.filter({
+            key: makeV1Key(versionKey1),
+            value: value1,
+        }), FILTER_ACCEPT);
+
+        // filter second version
+        const versionId2 = 'version2';
+        const versionKey2 = `${masterKey}${VID_SEP}${versionId2}`;
+        const date2 = '1970-01-01T00:00:00.001Z';
+        const value2 = `{"versionId":"${versionId2}", "last-modified": "${date2}"}`;
+
+        assert.strictEqual(delimiter.filter({
+            key: makeV1Key(versionKey2),
+            value: value2,
+        }), FILTER_ACCEPT);
+
+        const expectedResult = {
+            Contents: [
+                {
+                    key: masterKey,
+                    value: `{"versionId":"${versionId2}","last-modified":"${date2}","staleDate":"${date1}"}`,
+                },
+            ],
+            IsTruncated: false,
+        };
+
+        assert.deepStrictEqual(delimiter.result(), expectedResult);
+    });
+
+    it('should end filtering if max keys reached', () => {
+        const delimiter = new DelimiterNonCurrent({ maxKeys: 1 }, fakeLogger, 'v1');
+
+        const masterKey = 'key';
+
+        // filter delete marker
+        const versionId1 = 'version1';
+        const versionKey1 = `${masterKey}${VID_SEP}${versionId1}`;
+        const date1 = '1970-01-01T00:00:00.002Z';
+        const value1 = `{"versionId":"${versionId1}", "last-modified": "${date1}", "isDeleteMarker": true}`;
+
+        assert.strictEqual(delimiter.filter({
+            key: makeV1Key(versionKey1),
+            value: value1,
+        }), FILTER_ACCEPT);
+
+        // filter second version
+        const versionId2 = 'version2';
+        const versionKey2 = `${masterKey}${VID_SEP}${versionId2}`;
+        const date2 = '1970-01-01T00:00:00.001Z';
+        const value2 = `{"versionId":"${versionId2}", "last-modified": "${date2}"}`;
+
+        assert.strictEqual(delimiter.filter({
+            key: makeV1Key(versionKey2),
+            value: value2,
+        }), FILTER_ACCEPT);
+
+        // filter third version
+        const versionId3 = 'version3';
+        const versionKey3 = `${masterKey}${VID_SEP}${versionId3}`;
+        const date3 = '1970-01-01T00:00:00.000Z';
+        const value3 = `{"versionId":"${versionId3}", "last-modified": "${date3}"}`;
+
+        assert.strictEqual(delimiter.filter({
+            key: makeV1Key(versionKey3),
+            value: value3,
+        }), FILTER_END);
+
+
+        const expectedResult = {
+            Contents: [
+                {
+                    key: masterKey,
+                    value: `{"versionId":"${versionId2}","last-modified":"${date2}","staleDate":"${date1}"}`,
+                },
+            ],
+            IsTruncated: true,
+            NextKeyMarker: masterKey,
+            NextVersionIdMarker: versionId2,
+        };
+
+        assert.deepStrictEqual(delimiter.result(), expectedResult);
+    });
+
+    it('should end filtering if delimiter timeout', () => {
+        const delimiter = new DelimiterNonCurrent({ }, fakeLogger, 'v1');
+
+        const masterKey = 'key';
+
+        // filter delete marker
+        const versionId1 = 'version1';
+        const versionKey1 = `${masterKey}${VID_SEP}${versionId1}`;
+        const date1 = '1970-01-01T00:00:00.002Z';
+        const value1 = `{"versionId":"${versionId1}", "last-modified": "${date1}", "isDeleteMarker": true}`;
+
+        assert.strictEqual(delimiter.filter({
+            key: makeV1Key(versionKey1),
+            value: value1,
+        }), FILTER_ACCEPT);
+
+        // filter second version
+        const versionId2 = 'version2';
+        const versionKey2 = `${masterKey}${VID_SEP}${versionId2}`;
+        const date2 = '1970-01-01T00:00:00.001Z';
+        const value2 = `{"versionId":"${versionId2}", "last-modified": "${date2}"}`;
+
+        assert.strictEqual(delimiter.filter({
+            key: makeV1Key(versionKey2),
+            value: value2,
+        }), FILTER_ACCEPT);
+
+        // force delimiter to timeout.
+        delimiter.start = Date.now() - (DELIMITER_TIMEOUT_MS + 1);
+
+        // filter third version
+        const versionId3 = 'version3';
+        const versionKey3 = `${masterKey}${VID_SEP}${versionId3}`;
+        const date3 = '1970-01-01T00:00:00.000Z';
+        const value3 = `{"versionId":"${versionId3}", "last-modified": "${date3}"}`;
+
+        assert.strictEqual(delimiter.filter({
+            key: makeV1Key(versionKey3),
+            value: value3,
+        }), FILTER_END);
+
+
+        const expectedResult = {
+            Contents: [
+                {
+                    key: masterKey,
+                    value: `{"versionId":"${versionId2}","last-modified":"${date2}","staleDate":"${date1}"}`,
+                },
+            ],
+            IsTruncated: true,
+            NextKeyMarker: masterKey,
+            NextVersionIdMarker: versionId2,
+        };
+
+        assert.deepStrictEqual(delimiter.result(), expectedResult);
+    });
+
+    it('should end filtering if delimiter timeout with empty content', () => {
+        const delimiter = new DelimiterNonCurrent({ }, fakeLogger, 'v1');
+
+        // filter current version
+        const masterKey1 = 'key1';
+        const versionId1 = 'version1';
+        const versionKey1 = `${masterKey1}${VID_SEP}${versionId1}`;
+        const date1 = '1970-01-01T00:00:00.002Z';
+        const value1 = `{"versionId":"${versionId1}", "last-modified": "${date1}"`;
+
+        assert.strictEqual(delimiter.filter({
+            key: makeV1Key(versionKey1),
+            value: value1,
+        }), FILTER_ACCEPT);
+
+        // filter current version
+        const masterKey2 = 'key2';
+        const versionId2 = 'version2';
+        const versionKey2 = `${masterKey2}${VID_SEP}${versionId2}`;
+        const date2 = '1970-01-01T00:00:00.001Z';
+        const value2 = `{"versionId":"${versionId2}", "last-modified": "${date2}"}`;
+
+        assert.strictEqual(delimiter.filter({
+            key: makeV1Key(versionKey2),
+            value: value2,
+        }), FILTER_ACCEPT);
+
+        // force delimiter to timeout.
+        delimiter.start = Date.now() - (DELIMITER_TIMEOUT_MS + 1);
+
+        // filter current version
+        const masterKey3 = 'key3';
+        const versionId3 = 'version3';
+        const versionKey3 = `${masterKey3}${VID_SEP}${versionId3}`;
+        const date3 = '1970-01-01T00:00:00.000Z';
+        const value3 = `{"versionId":"${versionId3}", "last-modified": "${date3}"}`;
+
+        assert.strictEqual(delimiter.filter({
+            key: makeV1Key(versionKey3),
+            value: value3,
+        }), FILTER_END);
+
+        const expectedResult = {
+            Contents: [],
+            IsTruncated: true,
+            NextKeyMarker: masterKey2,
+            NextVersionIdMarker: versionId2,
+        };
+
+        assert.deepStrictEqual(delimiter.result(), expectedResult);
    });
 });
--- a/tests/unit/algos/list/delimiterOrphanDeleteMarker.spec.js
+++ b/tests/unit/algos/list/delimiterOrphanDeleteMarker.spec.js
@ -6,13 +6,17 @@ const DelimiterOrphanDeleteMarker =
    require('../../../../lib/algos/list/delimiterOrphanDeleteMarker').DelimiterOrphanDeleteMarker;
 const {
    FILTER_ACCEPT,
+    FILTER_SKIP,
    FILTER_END,
-    inc,
 } = require('../../../../lib/algos/list/tools');
 const VSConst =
    require('../../../../lib/versioning/constants').VersioningConstants;
 const { DbPrefixes } = VSConst;

+// TODO: find an acceptable timeout value.
+const DELIMITER_TIMEOUT_MS = 10 * 1000; // 10s
+
+
 const VID_SEP = VSConst.VersionId.Separator;
 const EmptyResult = {
    Contents: [],
@ -28,466 +32,347 @@ const fakeLogger = {
    fatal: () => {},
 };

-function getListingKey(key, vFormat) {
-    if (vFormat === 'v0') {
-        return key;
-    }
-    if (vFormat === 'v1') {
-        const keyPrefix = key.includes(VID_SEP) ?
-            DbPrefixes.Version : DbPrefixes.Master;
-        return `${keyPrefix}${key}`;
-    }
-    return assert.fail(`bad format ${vFormat}`);
+function makeV1Key(key) {
+    const keyPrefix = key.includes(VID_SEP) ?
+        DbPrefixes.Version : DbPrefixes.Master;
+    return `${keyPrefix}${key}`;
 }

-['v0', 'v1'].forEach(v => {
-    describe(`DelimiterOrphanDeleteMarker with ${v} bucket format`, () => {
-        it('should return expected metadata parameters', () => {
-            const prefix = 'pre';
-            const marker = 'premark';
-            const maxScannedLifecycleListingEntries = 2;
-            const delimiter = new DelimiterOrphanDeleteMarker({
-                prefix,
-                marker,
-                maxScannedLifecycleListingEntries,
-            }, fakeLogger, v);
-
-            let expectedParams;
-            if (v === 'v0') {
-                expectedParams = { gt: `premark${inc(VID_SEP)}`, lt: 'prf' };
-            } else {
-                expectedParams = [
-                    {
-                        gt: `${DbPrefixes.Master}premark${inc(VID_SEP)}`,
-                        lt: `${DbPrefixes.Master}prf`,
-                    },
-                    {
-                        gt: `${DbPrefixes.Version}premark${inc(VID_SEP)}`,
-                        lt: `${DbPrefixes.Version}prf`,
-                    },
-                ];
-            }
-            assert.deepStrictEqual(delimiter.genMDParams(), expectedParams);
-            assert.strictEqual(delimiter.maxScannedLifecycleListingEntries, 2);
-        });
-        it('should accept entry starting with prefix', () => {
-            const delimiter = new DelimiterOrphanDeleteMarker({ prefix: 'prefix' }, fakeLogger, v);
-
-            const listingKey = getListingKey('prefix1', v);
-            assert.strictEqual(delimiter.filter({ key: listingKey, value: '' }), FILTER_ACCEPT);
-
-            assert.deepStrictEqual(delimiter.result(), EmptyResult);
-        });
-
-        it('should accept a version and return an empty content', () => {
-            const delimiter = new DelimiterOrphanDeleteMarker({ }, fakeLogger, v);
-
-            const masterKey = 'key';
-
-            const versionId1 = 'version1';
-            const versionKey1 = `${masterKey}${VID_SEP}${versionId1}`;
-            const date1 = '1970-01-01T00:00:00.001Z';
-            const value1 = `{"versionId":"${versionId1}","last-modified":"${date1}"}`;
-
-            assert.strictEqual(delimiter.filter({
-                key: getListingKey(versionKey1, v),
-                value: value1,
-            }), FILTER_ACCEPT);
-
-            assert.deepStrictEqual(delimiter.result(), EmptyResult);
-        });
-
-        it('should accept an orphan delete marker and return it from the content', () => {
-            const delimiter = new DelimiterOrphanDeleteMarker({ }, fakeLogger, v);
-
-            const masterKey = 'key';
-
-            const versionId1 = 'version1';
-            const versionKey1 = `${masterKey}${VID_SEP}${versionId1}`;
-            const date1 = '1970-01-01T00:00:00.001Z';
-            const value1 = `{"versionId":"${versionId1}","last-modified":"${date1}","isDeleteMarker":true}`;
-
-            assert.strictEqual(delimiter.filter({
-                key: getListingKey(versionKey1, v),
-                value: value1,
-            }), FILTER_ACCEPT);
-
-            const expectedResult = {
-                Contents: [
-                    {
-                        key: masterKey,
-                        value: value1,
-                    },
-                ],
-                IsTruncated: false,
-            };
-
-            assert.deepStrictEqual(delimiter.result(), expectedResult);
-        });
-
-        it('should accept two orphan delete markers and return them from the content', () => {
-            const delimiter = new DelimiterOrphanDeleteMarker({ }, fakeLogger, v);
-
-            // filter the first orphan delete marker
-            const masterKey1 = 'key1';
-            const versionId1 = 'version1';
-            const versionKey1 = `${masterKey1}${VID_SEP}${versionId1}`;
-            const date1 = '1970-01-01T00:00:00.002Z';
-            const value1 = `{"versionId":"${versionId1}","last-modified":"${date1}","isDeleteMarker":true}`;
-
-            assert.strictEqual(delimiter.filter({
-                key: getListingKey(versionKey1, v),
-                value: value1,
-            }), FILTER_ACCEPT);
-
-            // filter the second orphan delete marker
-            const masterKey2 = 'key2';
-            const versionId2 = 'version2';
-            const versionKey2 = `${masterKey2}${VID_SEP}${versionId2}`;
-            const date2 = '1970-01-01T00:00:00.001Z';
-            const value2 = `{"versionId":"${versionId2}","last-modified":"${date2}","isDeleteMarker":true}`;
-
-            assert.strictEqual(delimiter.filter({
-                key: getListingKey(versionKey2, v),
-                value: value2,
-            }), FILTER_ACCEPT);
-
-            const expectedResult = {
-                Contents: [
-                    {
-                        key: masterKey1,
-                        value: value1,
-                    },
-                    {
-                        key: masterKey2,
-                        value: value2,
-                    },
-                ],
-                IsTruncated: false,
-            };
-
-            assert.deepStrictEqual(delimiter.result(), expectedResult);
-        });
-
-        it('should accept two orphan delete markers and return truncated content with one', () => {
-            const delimiter = new DelimiterOrphanDeleteMarker({ maxKeys: 1 }, fakeLogger, v);
-
-            // filter the first orphan delete marker
-            const masterKey1 = 'key1';
-            const versionId1 = 'version1';
-            const versionKey1 = `${masterKey1}${VID_SEP}${versionId1}`;
-            const date1 = '1970-01-01T00:00:00.002Z';
-            const value1 = `{"versionId":"${versionId1}","last-modified":"${date1}","isDeleteMarker":true}`;
-
-            assert.strictEqual(delimiter.filter({
-                key: getListingKey(versionKey1, v),
-                value: value1,
-            }), FILTER_ACCEPT);
-
-            // filter the second orphan delete marker
-            const masterKey2 = 'key2';
-            const versionId2 = 'version2';
-            const versionKey2 = `${masterKey2}${VID_SEP}${versionId2}`;
-            const date2 = '1970-01-01T00:00:00.001Z';
-            const value2 = `{"versionId":"${versionId2}","last-modified":"${date2}","isDeleteMarker":true}`;
-
-            assert.strictEqual(delimiter.filter({
-                key: getListingKey(versionKey2, v),
-                value: value2,
-            }), FILTER_ACCEPT);
-
-            const expectedResult = {
-                Contents: [
-                    {
-                        key: masterKey1,
-                        value: value1,
-                    },
-                ],
-                NextMarker: masterKey1,
-                IsTruncated: true,
-            };
-
-            assert.deepStrictEqual(delimiter.result(), expectedResult);
-        });
-
-        it('should accept two orphan delete markers and return the one created before the beforeDate', () => {
-            const date1 = '1970-01-01T00:00:00.002Z';
-            const delimiter = new DelimiterOrphanDeleteMarker({ beforeDate: date1 }, fakeLogger, v);
-
-            // filter the first orphan delete marker
-            const masterKey1 = 'key1';
-            const versionId1 = 'version1';
-            const versionKey1 = `${masterKey1}${VID_SEP}${versionId1}`;
-            const value1 = `{"versionId":"${versionId1}","last-modified":"${date1}","isDeleteMarker":true}`;
-
-            assert.strictEqual(delimiter.filter({
-                key: getListingKey(versionKey1, v),
-                value: value1,
-            }), FILTER_ACCEPT);
-
-            // filter the second orphan delete marker
-            const masterKey2 = 'key2';
-            const versionId2 = 'version2';
-            const versionKey2 = `${masterKey2}${VID_SEP}${versionId2}`;
-            const date2 = '1970-01-01T00:00:00.001Z';
-            const value2 = `{"versionId":"${versionId2}","last-modified":"${date2}","isDeleteMarker":true}`;
-
-            assert.strictEqual(delimiter.filter({
-                key: getListingKey(versionKey2, v),
-                value: value2,
-            }), FILTER_ACCEPT);
-
-            const expectedResult = {
-                Contents: [
-                    {
-                        key: masterKey2,
-                        value: value2,
-                    },
-                ],
-                IsTruncated: false,
-            };
-
-            assert.deepStrictEqual(delimiter.result(), expectedResult);
-        });
-
-        it('should end filtering if max keys reached', () => {
-            const delimiter = new DelimiterOrphanDeleteMarker({ maxKeys: 1 }, fakeLogger, v);
-
-            // filter the first orphan delete marker
-            const masterKey1 = 'key1';
-            const versionId1 = 'version1';
-            const versionKey1 = `${masterKey1}${VID_SEP}${versionId1}`;
-            const date1 = '1970-01-01T00:00:00.002Z';
-            const value1 = `{"versionId":"${versionId1}","last-modified":"${date1}","isDeleteMarker":true}`;
-
-            assert.strictEqual(delimiter.filter({
-                key: getListingKey(versionKey1, v),
-                value: value1,
-            }), FILTER_ACCEPT);
-
-            // filter the second orphan delete marker
-            const masterKey2 = 'key2';
-            const versionId2 = 'version2';
-            const versionKey2 = `${masterKey2}${VID_SEP}${versionId2}`;
-            const date2 = '1970-01-01T00:00:00.001Z';
-            const value2 = `{"versionId":"${versionId2}","last-modified":"${date2}","isDeleteMarker":true}`;
-
-            assert.strictEqual(delimiter.filter({
-                key: getListingKey(versionKey2, v),
-                value: value2,
-            }), FILTER_ACCEPT);
-
-            // filter the third orphan delete marker
-            const masterKey3 = 'key3';
-            const versionId3 = 'version3';
-            const versionKey3 = `${masterKey3}${VID_SEP}${versionId3}`;
-            const date3 = '1970-01-01T00:00:00.000Z';
-            const value3 = `{"versionId":"${versionId3}","last-modified":"${date3}","isDeleteMarker":true}`;
-
-            assert.strictEqual(delimiter.filter({
-                key: getListingKey(versionKey3, v),
-                value: value3,
-            }), FILTER_END);
-
-            const expectedResult = {
-                Contents: [
-                    {
-                        key: masterKey1,
-                        value: value1,
-                    },
-                ],
-                NextMarker: masterKey1,
-                IsTruncated: true,
-            };
-
-            assert.deepStrictEqual(delimiter.result(), expectedResult);
-        });
-
-        it('should end filtering if max scanned entries value is reached', () => {
-            const maxScannedLifecycleListingEntries = 2;
-            const delimiter = new DelimiterOrphanDeleteMarker({ maxScannedLifecycleListingEntries }, fakeLogger, v);
-
-            // filter the first orphan delete marker
-            const masterKey1 = 'key1';
-            const versionId1 = 'version1';
-            const versionKey1 = `${masterKey1}${VID_SEP}${versionId1}`;
-            const date1 = '1970-01-01T00:00:00.002Z';
-            const value1 = `{"versionId":"${versionId1}","last-modified":"${date1}","isDeleteMarker":true}`;
-
-            assert.strictEqual(delimiter.filter({
-                key: getListingKey(versionKey1, v),
-                value: value1,
-            }), FILTER_ACCEPT);
-
-            // filter the second orphan delete marker
-            const masterKey2 = 'key2';
-            const versionId2 = 'version2';
-            const versionKey2 = `${masterKey2}${VID_SEP}${versionId2}`;
-            const date2 = '1970-01-01T00:00:00.001Z';
-            const value2 = `{"versionId":"${versionId2}","last-modified":"${date2}","isDeleteMarker":true}`;
-
-            assert.strictEqual(delimiter.filter({
-                key: getListingKey(versionKey2, v),
-                value: value2,
-            }), FILTER_ACCEPT);
-
-            // filter the third orphan delete marker
-            const masterKey3 = 'key3';
-            const versionId3 = 'version3';
-            const versionKey3 = `${masterKey3}${VID_SEP}${versionId3}`;
-            const date3 = '1970-01-01T00:00:00.001Z';
-            const value3 = `{"versionId":"${versionId3}","last-modified":"${date3}","isDeleteMarker":true}`;
-
-            assert.strictEqual(delimiter.filter({
-                key: getListingKey(versionKey3, v),
-                value: value3,
-            }), FILTER_END);
-
-            const expectedResult = {
-                Contents: [
-                    {
-                        key: masterKey1,
-                        value: value1,
-                    },
-                ],
-                NextMarker: masterKey1,
-                IsTruncated: true,
-            };
-
-            assert.deepStrictEqual(delimiter.result(), expectedResult);
-        });
-
-        it('should not consider the last delete marker scanned as an orphan if listing interrupted', () => {
-            const maxScannedLifecycleListingEntries = 1;
-            const delimiter = new DelimiterOrphanDeleteMarker({ maxScannedLifecycleListingEntries }, fakeLogger, v);
-
-            // filter the delete marker (not orphan)
-            const masterKey1 = 'key1';
-            const versionId1 = 'version1';
-            const versionKey1 = `${masterKey1}${VID_SEP}${versionId1}`;
-            const date1 = '1970-01-01T00:00:00.001Z';
-            const value1 = `{"versionId":"${versionId1}","last-modified":"${date1}","isDeleteMarker":true}`;
-
-            assert.strictEqual(delimiter.filter({
-                key: getListingKey(versionKey1, v),
-                value: value1,
-            }), FILTER_ACCEPT);
-
-            const versionId2 = 'version2';
-            const versionKey2 = `${masterKey1}${VID_SEP}${versionId2}`;
-            const date2 = '1970-01-01T00:00:00.002Z';
-            const value2 = `{"versionId":"${versionId2}","last-modified":"${date2}","isDeleteMarker":true}`;
-
-            assert.strictEqual(delimiter.filter({
-                key: getListingKey(versionKey2, v),
-                value: value2,
-            }), FILTER_END);
-
-            const expectedResult = {
-                Contents: [],
-                NextMarker: null,
-                IsTruncated: true,
-            };
-
-            assert.deepStrictEqual(delimiter.result(), expectedResult);
-        });
-
-        it('should end filtering with empty content if max scanned entries value is reached', () => {
-            const maxScannedLifecycleListingEntries = 2;
-            const delimiter = new DelimiterOrphanDeleteMarker({ maxScannedLifecycleListingEntries }, fakeLogger, v);
-
-            // not a delete marker
-            const masterKey1 = 'key1';
-            const versionId1 = 'version1';
-            const versionKey1 = `${masterKey1}${VID_SEP}${versionId1}`;
-            const date1 = '1970-01-01T00:00:00.002Z';
-            const value1 = `{"versionId":"${versionId1}","last-modified":"${date1}"}`;
-
-            assert.strictEqual(delimiter.filter({
-                key: getListingKey(versionKey1, v),
-                value: value1,
-            }), FILTER_ACCEPT);
-
-            // not a delete marker
-            const masterKey2 = 'key2';
-            const versionId2 = 'version2';
-            const versionKey2 = `${masterKey2}${VID_SEP}${versionId2}`;
-            const date2 = '1970-01-01T00:00:00.001Z';
-            const value2 = `{"versionId":"${versionId2}","last-modified":"${date2}"}`;
-
-            assert.strictEqual(delimiter.filter({
-                key: getListingKey(versionKey2, v),
-                value: value2,
-            }), FILTER_ACCEPT);
-
-            // orphan delete marker
-            const masterKey3 = 'key3';
-            const versionId3 = 'version3';
-            const versionKey3 = `${masterKey3}${VID_SEP}${versionId3}`;
-            const date3 = '1970-01-01T00:00:00.000Z';
-            const value3 = `{"versionId":"${versionId3}","last-modified":"${date3}","isDeleteMarker":true}`;
-
-            assert.strictEqual(delimiter.filter({
-                key: getListingKey(versionKey3, v),
-                value: value3,
-            }), FILTER_END);
-
-            const expectedResult = {
-                Contents: [],
-                NextMarker: masterKey1,
-                IsTruncated: true,
-            };
-
-            assert.deepStrictEqual(delimiter.result(), expectedResult);
-        });
-
-        it('should return NextMarker when the max scanned entries is reached while processing a non-orphan key', () => {
-        // This approach prevents us from starting the next listing from the non-orphan key and, as a result,
-        // avoids the need to revisit all its versions unnecessarily.
-            const maxScannedLifecycleListingEntries = 2;
-            const delimiter = new DelimiterOrphanDeleteMarker({ maxScannedLifecycleListingEntries }, fakeLogger, v);
-
-            // key 1 is not an orphan
-            const masterKey1 = 'key1';
-            const versionId1 = 'version1';
-            const versionKey1 = `${masterKey1}${VID_SEP}${versionId1}`;
-            const date1 = '1970-01-01T00:00:00.002Z';
-            const value1 = `{"versionId":"${versionId1}","last-modified":"${date1}","isDeleteMarker":true}`;
-
-            assert.strictEqual(delimiter.filter({
-                key: getListingKey(versionKey1, v),
-                value: value1,
-            }), FILTER_ACCEPT);
-
-            const versionId2 = 'version2';
-            const versionKey2 = `${masterKey1}${VID_SEP}${versionId2}`;
-            const date2 = '1970-01-01T00:00:00.001Z';
-            const value2 = `{"versionId":"${versionId2}","last-modified":"${date2}"}`;
-
-            assert.strictEqual(delimiter.filter({
-                key: getListingKey(versionKey2, v),
-                value: value2,
-            }), FILTER_ACCEPT);
-
-            // orphan delete marker
-            const masterKey3 = 'key3';
-            const versionId3 = 'version3';
-            const versionKey3 = `${masterKey3}${VID_SEP}${versionId3}`;
-            const date3 = '1970-01-01T00:00:00.000Z';
-            const value3 = `{"versionId":"${versionId3}","last-modified":"${date3}","isDeleteMarker":true}`;
-
-            assert.strictEqual(delimiter.filter({
-                key: getListingKey(versionKey3, v),
-                value: value3,
-            }), FILTER_END);
-
-            const expectedResult = {
-                Contents: [],
-                NextMarker: masterKey1,
-                IsTruncated: true,
-            };
-
-            assert.deepStrictEqual(delimiter.result(), expectedResult);
-        });
+describe('DelimiterOrphanDeleteMarker', () => {
+    it('should accept entry starting with prefix', () => {
+        const delimiter = new DelimiterOrphanDeleteMarker({ prefix: 'prefix' }, fakeLogger, 'v1');
+
+        const listingKey = makeV1Key('prefix1');
+        assert.strictEqual(delimiter.filter({ key: listingKey, value: '' }), FILTER_ACCEPT);
+
+        assert.deepStrictEqual(delimiter.result(), EmptyResult);
+    });
+
+    it('should skip entry not starting with prefix', () => {
+        const delimiter = new DelimiterOrphanDeleteMarker({ prefix: 'prefix' }, fakeLogger, 'v1');
+
+        const listingKey = makeV1Key('noprefix');
+        assert.strictEqual(delimiter.filter({ key: listingKey, value: '' }), FILTER_SKIP);
+
+        assert.deepStrictEqual(delimiter.result(), EmptyResult);
+    });
+
+    it('should accept a version and return an empty content', () => {
+        const delimiter = new DelimiterOrphanDeleteMarker({ }, fakeLogger, 'v1');
+
+        const masterKey = 'key';
+
+        const versionId1 = 'version1';
+        const versionKey1 = `${masterKey}${VID_SEP}${versionId1}`;
+        const date1 = '1970-01-01T00:00:00.001Z';
+        const value1 = `{"versionId":"${versionId1}","last-modified":"${date1}"}`;
+
+        assert.strictEqual(delimiter.filter({
+            key: makeV1Key(versionKey1),
+            value: value1,
+        }), FILTER_ACCEPT);
+
+        assert.deepStrictEqual(delimiter.result(), EmptyResult);
+    });
+
+    it('should accept an orphan delete marker and return it from the content', () => {
+        const delimiter = new DelimiterOrphanDeleteMarker({ }, fakeLogger, 'v1');
+
+        const masterKey = 'key';
+
+        const versionId1 = 'version1';
+        const versionKey1 = `${masterKey}${VID_SEP}${versionId1}`;
+        const date1 = '1970-01-01T00:00:00.001Z';
+        const value1 = `{"versionId":"${versionId1}","last-modified":"${date1}","isDeleteMarker":true}`;
+
+        assert.strictEqual(delimiter.filter({
+            key: makeV1Key(versionKey1),
+            value: value1,
+        }), FILTER_ACCEPT);
+
+        const expectedResult = {
+            Contents: [
+                {
+                    key: masterKey,
+                    value: value1,
+                },
+            ],
+            IsTruncated: false,
+        };
+
+        assert.deepStrictEqual(delimiter.result(), expectedResult);
+    });
+
+    it('should accept two orphan delete markers and return them from the content', () => {
+        const delimiter = new DelimiterOrphanDeleteMarker({ }, fakeLogger, 'v1');
+
+        // filter the first orphan delete marker
+        const masterKey1 = 'key1';
+        const versionId1 = 'version1';
+        const versionKey1 = `${masterKey1}${VID_SEP}${versionId1}`;
+        const date1 = '1970-01-01T00:00:00.002Z';
+        const value1 = `{"versionId":"${versionId1}","last-modified":"${date1}","isDeleteMarker":true}`;
+
+        assert.strictEqual(delimiter.filter({
+            key: makeV1Key(versionKey1),
+            value: value1,
+        }), FILTER_ACCEPT);
+
+        // filter the second orphan delete marker
+        const masterKey2 = 'key2';
+        const versionId2 = 'version2';
+        const versionKey2 = `${masterKey2}${VID_SEP}${versionId2}`;
+        const date2 = '1970-01-01T00:00:00.001Z';
+        const value2 = `{"versionId":"${versionId2}","last-modified":"${date2}","isDeleteMarker":true}`;
+
+        assert.strictEqual(delimiter.filter({
+            key: makeV1Key(versionKey2),
+            value: value2,
+        }), FILTER_ACCEPT);
+
+        const expectedResult = {
+            Contents: [
+                {
+                    key: masterKey1,
+                    value: value1,
+                },
+                {
+                    key: masterKey2,
+                    value: value2,
+                },
+            ],
+            IsTruncated: false,
+        };
+
+        assert.deepStrictEqual(delimiter.result(), expectedResult);
+    });
+
+    it('should accept two orphan delete markers and return truncated content with one', () => {
+        const delimiter = new DelimiterOrphanDeleteMarker({ maxKeys: 1 }, fakeLogger, 'v1');
+
+        // filter the first orphan delete marker
+        const masterKey1 = 'key1';
+        const versionId1 = 'version1';
+        const versionKey1 = `${masterKey1}${VID_SEP}${versionId1}`;
+        const date1 = '1970-01-01T00:00:00.002Z';
+        const value1 = `{"versionId":"${versionId1}","last-modified":"${date1}","isDeleteMarker":true}`;
+
+        assert.strictEqual(delimiter.filter({
+            key: makeV1Key(versionKey1),
+            value: value1,
+        }), FILTER_ACCEPT);
+
+        // filter the second orphan delete marker
+        const masterKey2 = 'key2';
+        const versionId2 = 'version2';
+        const versionKey2 = `${masterKey2}${VID_SEP}${versionId2}`;
+        const date2 = '1970-01-01T00:00:00.001Z';
+        const value2 = `{"versionId":"${versionId2}","last-modified":"${date2}","isDeleteMarker":true}`;
+
+        assert.strictEqual(delimiter.filter({
+            key: makeV1Key(versionKey2),
+            value: value2,
+        }), FILTER_ACCEPT);
+
+        const expectedResult = {
+            Contents: [
+                {
+                    key: masterKey1,
+                    value: value1,
+                },
+            ],
+            NextMarker: masterKey1,
+            IsTruncated: true,
+        };
+
+        assert.deepStrictEqual(delimiter.result(), expectedResult);
+    });
+
+    it('should accept two orphan delete markers and return the one created before the beforeDate', () => {
+        const date1 = '1970-01-01T00:00:00.002Z';
+        const delimiter = new DelimiterOrphanDeleteMarker({ beforeDate: date1 }, fakeLogger, 'v1');
+
+        // filter the first orphan delete marker
+        const masterKey1 = 'key1';
+        const versionId1 = 'version1';
+        const versionKey1 = `${masterKey1}${VID_SEP}${versionId1}`;
+        const value1 = `{"versionId":"${versionId1}","last-modified":"${date1}","isDeleteMarker":true}`;
+
+        assert.strictEqual(delimiter.filter({
+            key: makeV1Key(versionKey1),
+            value: value1,
+        }), FILTER_ACCEPT);
+
+        // filter the second orphan delete marker
+        const masterKey2 = 'key2';
+        const versionId2 = 'version2';
+        const versionKey2 = `${masterKey2}${VID_SEP}${versionId2}`;
+        const date2 = '1970-01-01T00:00:00.001Z';
+        const value2 = `{"versionId":"${versionId2}","last-modified":"${date2}","isDeleteMarker":true}`;
+
+        assert.strictEqual(delimiter.filter({
+            key: makeV1Key(versionKey2),
+            value: value2,
+        }), FILTER_ACCEPT);
+
+        const expectedResult = {
+            Contents: [
+                {
+                    key: masterKey2,
+                    value: value2,
+                },
+            ],
+            IsTruncated: false,
+        };
+
+        assert.deepStrictEqual(delimiter.result(), expectedResult);
+    });
+
+    it('should end filtering if max keys reached', () => {
+        const delimiter = new DelimiterOrphanDeleteMarker({ maxKeys: 1 }, fakeLogger, 'v1');
+
+        // filter the first orphan delete marker
+        const masterKey1 = 'key1';
+        const versionId1 = 'version1';
+        const versionKey1 = `${masterKey1}${VID_SEP}${versionId1}`;
+        const date1 = '1970-01-01T00:00:00.002Z';
+        const value1 = `{"versionId":"${versionId1}","last-modified":"${date1}","isDeleteMarker":true}`;
+
+        assert.strictEqual(delimiter.filter({
+            key: makeV1Key(versionKey1),
+            value: value1,
+        }), FILTER_ACCEPT);
+
+        // filter the second orphan delete marker
+        const masterKey2 = 'key2';
+        const versionId2 = 'version2';
+        const versionKey2 = `${masterKey2}${VID_SEP}${versionId2}`;
+        const date2 = '1970-01-01T00:00:00.001Z';
+        const value2 = `{"versionId":"${versionId2}","last-modified":"${date2}","isDeleteMarker":true}`;
+
+        assert.strictEqual(delimiter.filter({
+            key: makeV1Key(versionKey2),
+            value: value2,
+        }), FILTER_ACCEPT);
+
+        // filter the third orphan delete marker
+        const masterKey3 = 'key3';
+        const versionId3 = 'version3';
+        const versionKey3 = `${masterKey3}${VID_SEP}${versionId3}`;
+        const date3 = '1970-01-01T00:00:00.000Z';
+        const value3 = `{"versionId":"${versionId3}","last-modified":"${date3}","isDeleteMarker":true}`;
+
+        assert.strictEqual(delimiter.filter({
+            key: makeV1Key(versionKey3),
+            value: value3,
+        }), FILTER_END);
+
+        const expectedResult = {
+            Contents: [
+                {
+                    key: masterKey1,
+                    value: value1,
+                },
+            ],
+            NextMarker: masterKey1,
+            IsTruncated: true,
+        };
+
+        assert.deepStrictEqual(delimiter.result(), expectedResult);
+    });
+
+    it('should end filtering if delimiter timeout', () => {
+        const delimiter = new DelimiterOrphanDeleteMarker({ }, fakeLogger, 'v1');
+
+        // filter the first orphan delete marker
+        const masterKey1 = 'key1';
+        const versionId1 = 'version1';
+        const versionKey1 = `${masterKey1}${VID_SEP}${versionId1}`;
+        const date1 = '1970-01-01T00:00:00.002Z';
+        const value1 = `{"versionId":"${versionId1}","last-modified":"${date1}","isDeleteMarker":true}`;
+
+        assert.strictEqual(delimiter.filter({
+            key: makeV1Key(versionKey1),
+            value: value1,
+        }), FILTER_ACCEPT);
+
+        // force delimiter to timeout.
+        delimiter.start = Date.now() - (DELIMITER_TIMEOUT_MS + 1);
+
+        // filter the second orphan delete marker
+        const masterKey2 = 'key2';
+        const versionId2 = 'version2';
+        const versionKey2 = `${masterKey2}${VID_SEP}${versionId2}`;
+        const date2 = '1970-01-01T00:00:00.001Z';
+        const value2 = `{"versionId":"${versionId2}","last-modified":"${date2}","isDeleteMarker":true}`;
+
+        assert.strictEqual(delimiter.filter({
+            key: makeV1Key(versionKey2),
+            value: value2,
+        }), FILTER_END);
+
+        const expectedResult = {
+            Contents: [
+                {
+                    key: masterKey1,
+                    value: value1,
+                },
+            ],
+            NextMarker: masterKey1,
+            IsTruncated: true,
+        };
+
+        assert.deepStrictEqual(delimiter.result(), expectedResult);
+    });
+
+    it('should end filtering if delimiter timeout with empty content', () => {
+        const delimiter = new DelimiterOrphanDeleteMarker({ }, fakeLogger, 'v1');
+
+        // filter the first orphan delete marker
+        const masterKey1 = 'key1';
+        const versionId1 = 'version1';
+        const versionKey1 = `${masterKey1}${VID_SEP}${versionId1}`;
+        const date1 = '1970-01-01T00:00:00.002Z';
+        const value1 = `{"versionId":"${versionId1}","last-modified":"${date1}"}`;
+
+        assert.strictEqual(delimiter.filter({
+            key: makeV1Key(versionKey1),
+            value: value1,
+        }), FILTER_ACCEPT);
+
+        // filter the second orphan delete marker
+        const masterKey2 = 'key2';
+        const versionId2 = 'version2';
+        const versionKey2 = `${masterKey2}${VID_SEP}${versionId2}`;
+        const date2 = '1970-01-01T00:00:00.001Z';
+        const value2 = `{"versionId":"${versionId2}","last-modified":"${date2}"}`;
+
+        assert.strictEqual(delimiter.filter({
+            key: makeV1Key(versionKey2),
+            value: value2,
+        }), FILTER_ACCEPT);
+
+        // force delimiter to timeout.
+        delimiter.start = Date.now() - (DELIMITER_TIMEOUT_MS + 1);
+
+        // filter the third orphan delete marker
+        const masterKey3 = 'key3';
+        const versionId3 = 'version3';
+        const versionKey3 = `${masterKey3}${VID_SEP}${versionId3}`;
+        const date3 = '1970-01-01T00:00:00.000Z';
+        const value3 = `{"versionId":"${versionId3}","last-modified":"${date3}","isDeleteMarker":true}`;
+
+        assert.strictEqual(delimiter.filter({
+            key: makeV1Key(versionKey3),
+            value: value3,
+        }), FILTER_END);
+
+        const expectedResult = {
+            Contents: [],
+            NextMarker: masterKey2,
+            IsTruncated: true,
+        };
+
+        assert.deepStrictEqual(delimiter.result(), expectedResult);
    });
 });
--- a/tests/unit/algos/list/delimiterVersions.spec.js
+++ b/tests/unit/algos/list/delimiterVersions.spec.js
@ -42,11 +42,7 @@ const foo = '{"versionId":"foo"}';
 const bar = '{"versionId":"bar"}';
 const qux = '{"versionId":"qux"}';
 const valuePHD = '{"isPHD":"true","versionId":"1234567890abcdefg"}';
-const fooDM = '{"hello":"world","isDeleteMarker":"true","versionId":"foo"}';
-const barDM = '{"hello":"world","isDeleteMarker":"true","versionId":"bar"}';
-const quxDM = '{"hello":"world","isDeleteMarker":"true","versionId":"qux"}';
-const nullVersionMD = '{"hello":"world","isNull":true,"isNull2":true,"versionId":"vnull"}';
-const nullDMMD = '{"hello":"world","isNull":true,"isNull2":true,"isDeleteMarker":"true","versionId":"bar"}';
+const valueDeleteMarker = '{"hello":"world","isDeleteMarker":"true"}';
 const dataVersioned = {
    v0: [
        { key: 'Pâtisserie=中文-español-English', value: bar },
@ -57,7 +53,7 @@ const dataVersioned = {
        { key: `notes/spring/1.txt${VID_SEP}foo`, value: foo },
        { key: `notes/spring/1.txt${VID_SEP}qux`, value: qux },
        { key: 'notes/spring/2.txt', value: valuePHD },
-        { key: `notes/spring/2.txt${VID_SEP}bar`, value: barDM },
+        { key: `notes/spring/2.txt${VID_SEP}bar`, value: valueDeleteMarker },
        { key: `notes/spring/2.txt${VID_SEP}foo`, value: foo },
        { key: 'notes/spring/march/1.txt',
            value: '{"versionId":"null","isNull":true}' },
@ -69,13 +65,13 @@ const dataVersioned = {
        { key: 'notes/summer/2.txt', value: bar },
        { key: `notes/summer/2.txt${VID_SEP}bar`, value: bar },
        { key: 'notes/summer/4.txt', value: valuePHD },
-        { key: `notes/summer/4.txt${VID_SEP}bar`, value: barDM },
-        { key: `notes/summer/4.txt${VID_SEP}foo`, value: fooDM },
-        { key: `notes/summer/4.txt${VID_SEP}qux`, value: quxDM },
+        { key: `notes/summer/4.txt${VID_SEP}bar`, value: valueDeleteMarker },
+        { key: `notes/summer/4.txt${VID_SEP}foo`, value: valueDeleteMarker },
+        { key: `notes/summer/4.txt${VID_SEP}qux`, value: valueDeleteMarker },
        { key: 'notes/summer/44.txt', value: valuePHD },
-        { key: 'notes/summer/444.txt', value: fooDM },
+        { key: 'notes/summer/444.txt', value: valueDeleteMarker },
        { key: 'notes/summer/4444.txt', value: valuePHD },
-        { key: 'notes/summer/44444.txt', value: fooDM },
+        { key: 'notes/summer/44444.txt', value: valueDeleteMarker },
        { key: 'notes/summer/444444.txt', value: valuePHD },
        { key: 'notes/summer/august/1.txt', value },
        { key: 'notes/year.txt', value },
@ -96,11 +92,6 @@ const dataVersioned = {
        { key: `nullkey/5.txt${VID_SEP}`, value: qux },
        { key: `nullkey/5.txt${VID_SEP}bar`, value: bar },
        { key: `nullkey/5.txt${VID_SEP}foo`, value: foo },
-        { key: 'nullkey2/1.txt', value: fooDM },
-        { key: `nullkey2/1.txt${VID_SEP}`, value: nullVersionMD },
-        { key: `nullkey2/1.txt${VID_SEP}foo`, value: fooDM }, // current version
-        { key: 'nullkey3/1.txt', value: nullDMMD }, // current version
-        { key: `nullkey3/1.txt${VID_SEP}foo`, value: fooDM },
    ],
    v1: [ // we add M and V prefixes in getTestListing() due to the
        // test cases needing the original key to filter
@ -111,7 +102,7 @@ const dataVersioned = {
        { key: `notes/spring/1.txt${VID_SEP}bar`, value: bar },
        { key: `notes/spring/1.txt${VID_SEP}foo`, value: foo },
        { key: `notes/spring/1.txt${VID_SEP}qux`, value: qux },
-        { key: `notes/spring/2.txt${VID_SEP}bar`, value: barDM },
+        { key: `notes/spring/2.txt${VID_SEP}bar`, value: valueDeleteMarker },
        { key: `notes/spring/2.txt${VID_SEP}foo`, value: foo },
        { key: 'notes/spring/march/1.txt',
            value: '{"versionId":"null","isNull":true}' },
@ -122,14 +113,14 @@ const dataVersioned = {
        { key: `notes/summer/1.txt${VID_SEP}foo`, value: foo },
        { key: 'notes/summer/2.txt', value: bar },
        { key: `notes/summer/2.txt${VID_SEP}bar`, value: bar },
-        { key: `notes/summer/4.txt${VID_SEP}bar`, value: barDM },
-        { key: `notes/summer/4.txt${VID_SEP}foo`, value: fooDM },
-        { key: `notes/summer/4.txt${VID_SEP}qux`, value: quxDM },
+        { key: `notes/summer/4.txt${VID_SEP}bar`, value: valueDeleteMarker },
+        { key: `notes/summer/4.txt${VID_SEP}foo`, value: valueDeleteMarker },
+        { key: `notes/summer/4.txt${VID_SEP}qux`, value: valueDeleteMarker },
        // Compared to v0, the two following keys are version keys
-        // that have a version ID, because delete markers do not
+        // that we give a version ID, because delete markers do not
        // have a master key in v1.
-        { key: `notes/summer/444.txt${VID_SEP}foo`, value: fooDM },
-        { key: `notes/summer/44444.txt${VID_SEP}foo`, value: fooDM },
+        { key: `notes/summer/444.txt${VID_SEP}null`, value: valueDeleteMarker },
+        { key: `notes/summer/44444.txt${VID_SEP}null`, value: valueDeleteMarker },
        { key: 'notes/summer/august/1.txt', value },
        { key: 'notes/year.txt', value },
        { key: 'notes/yore.rs', value },
@ -146,10 +137,6 @@ const dataVersioned = {
        { key: `nullkey/5.txt${VID_SEP}`, value: qux },
        { key: `nullkey/5.txt${VID_SEP}bar`, value: bar },
        { key: `nullkey/5.txt${VID_SEP}foo`, value: foo },
-        { key: `nullkey2/1.txt${VID_SEP}`, value: nullVersionMD },
-        { key: `nullkey2/1.txt${VID_SEP}foo`, value: fooDM }, // current version
-        { key: `nullkey3/1.txt${VID_SEP}`, value: nullDMMD }, // current version
-        { key: `nullkey3/1.txt${VID_SEP}foo`, value: fooDM },
    ],
 };
 const receivedData = [
@ -158,7 +145,7 @@ const receivedData = [
    { key: 'notes/spring/1.txt', value: bar, versionId: 'bar' },
    { key: 'notes/spring/1.txt', value: foo, versionId: 'foo' },
    { key: 'notes/spring/1.txt', value: qux, versionId: 'qux' },
-    { key: 'notes/spring/2.txt', value: barDM, versionId: 'bar' },
+    { key: 'notes/spring/2.txt', value: valueDeleteMarker, versionId: 'bar' },
    { key: 'notes/spring/2.txt', value: foo, versionId: 'foo' },
    { key: 'notes/spring/march/1.txt',
        value: '{"versionId":"null","isNull":true}', versionId: 'null' },
@ -167,11 +154,13 @@ const receivedData = [
    { key: 'notes/summer/1.txt', value: bar, versionId: 'bar' },
    { key: 'notes/summer/1.txt', value: foo, versionId: 'foo' },
    { key: 'notes/summer/2.txt', value: bar, versionId: 'bar' },
-    { key: 'notes/summer/4.txt', value: barDM, versionId: 'bar' },
-    { key: 'notes/summer/4.txt', value: fooDM, versionId: 'foo' },
-    { key: 'notes/summer/4.txt', value: quxDM, versionId: 'qux' },
-    { key: 'notes/summer/444.txt', value: fooDM, versionId: 'foo' },
-    { key: 'notes/summer/44444.txt', value: fooDM, versionId: 'foo' },
+    { key: 'notes/summer/4.txt', value: valueDeleteMarker, versionId: 'bar' },
+    { key: 'notes/summer/4.txt', value: valueDeleteMarker, versionId: 'foo' },
+    { key: 'notes/summer/4.txt', value: valueDeleteMarker, versionId: 'qux' },
+    { key: 'notes/summer/444.txt',
+        value: valueDeleteMarker, versionId: 'null' },
+    { key: 'notes/summer/44444.txt',
+        value: valueDeleteMarker, versionId: 'null' },
    { key: 'notes/summer/august/1.txt', value, versionId: 'null' },
    { key: 'notes/year.txt', value, versionId: 'null' },
    { key: 'notes/yore.rs', value, versionId: 'null' },
@ -187,10 +176,6 @@ const receivedData = [
    { key: 'nullkey/5.txt', value: bar, versionId: 'bar' },
    { key: 'nullkey/5.txt', value: foo, versionId: 'foo' },
    { key: 'nullkey/5.txt', value: qux, versionId: 'qux' },
-    { key: 'nullkey2/1.txt', value: fooDM, versionId: 'foo' },
-    { key: 'nullkey2/1.txt', value: nullVersionMD, versionId: 'vnull' },
-    { key: 'nullkey3/1.txt', value: nullDMMD, versionId: 'bar' },
-    { key: 'nullkey3/1.txt', value: fooDM, versionId: 'foo' },
 ];
 const tests = [
    new Test('all versions', {}, {
@ -293,8 +278,6 @@ const tests = [
        CommonPrefixes: [
            'notes/',
            'nullkey/',
-            'nullkey2/',
-            'nullkey3/',
        ],
        Delimiter: '/',
        IsTruncated: false,
@ -846,11 +829,11 @@ function getTestListing(mdParams, data, vFormat) {
            }
            if (vFormat === 'v1') {
                assert.deepStrictEqual(delimiter.skipping(), [
-                    `${DbPrefixes.Master}foo0`,
-                    `${DbPrefixes.Version}foo0`,
+                    `${DbPrefixes.Master}foo/`,
+                    `${DbPrefixes.Version}foo/`,
                ]);
            } else {
-                assert.strictEqual(delimiter.skipping(), 'foo0');
+                assert.strictEqual(delimiter.skipping(), 'foo/');
            }
        });

@ -871,7 +854,7 @@ function getTestListing(mdParams, data, vFormat) {
                    }),
                    FILTER_SKIP);
                // ...it should skip the whole replay prefix
-                assert.strictEqual(delimiter.skipping(), inc(DbPrefixes.Replay));
+                assert.strictEqual(delimiter.skipping(), DbPrefixes.Replay);

                // simulate a listing that reaches regular object keys
                // beyond the replay prefix, ...
@ -882,7 +865,7 @@ function getTestListing(mdParams, data, vFormat) {
                    }),
                    FILTER_ACCEPT);
                // ...it should return to skipping by prefix as usual
-                assert.strictEqual(delimiter.skipping(), `${inc(DbPrefixes.Replay)}foo0`);
+                assert.strictEqual(delimiter.skipping(), `${inc(DbPrefixes.Replay)}foo/`);
            });
        }

@ -937,11 +920,11 @@ function getTestListing(mdParams, data, vFormat) {
            assert.strictEqual(delimiter.nextKeyMarker, 'foo/');

            if (vFormat === 'v0') {
-                assert.strictEqual(delimiter.skipping(), 'foo0');
+                assert.strictEqual(delimiter.skipping(), 'foo/');
            } else {
                assert.deepStrictEqual(delimiter.skipping(), [
-                    `${DbPrefixes.Master}foo0`,
-                    `${DbPrefixes.Version}foo0`,
+                    `${DbPrefixes.Master}foo/`,
+                    `${DbPrefixes.Version}foo/`,
                ]);
            }
        });
@ -958,11 +941,11 @@ function getTestListing(mdParams, data, vFormat) {
            assert.strictEqual(delimiter.nextKeyMarker, 'foo/');

            if (vFormat === 'v0') {
-                assert.strictEqual(delimiter.skipping(), 'foo0');
+                assert.strictEqual(delimiter.skipping(), 'foo/');
            } else {
                assert.deepStrictEqual(delimiter.skipping(), [
-                    `${DbPrefixes.Master}foo0`,
-                    `${DbPrefixes.Version}foo0`,
+                    `${DbPrefixes.Master}foo/`,
+                    `${DbPrefixes.Version}foo/`,
                ]);
            }
        });
@ -1249,11 +1232,11 @@ function getTestListing(mdParams, data, vFormat) {
            }), FILTER_SKIP);

            if (vFormat === 'v0') {
-                assert.deepStrictEqual(listing.skipping(), `key${VID_SEP}version3\0`);
+                assert.deepStrictEqual(listing.skipping(), `key${VID_SEP}version3`);
            } else {
                assert.deepStrictEqual(listing.skipping(), [
-                    `${DbPrefixes.Master}key${VID_SEP}version3\0`,
-                    `${DbPrefixes.Version}key${VID_SEP}version3\0`,
+                    `${DbPrefixes.Master}key${VID_SEP}version3`,
+                    `${DbPrefixes.Version}key${VID_SEP}version3`,
                ]);
            }

@ -1335,11 +1318,11 @@ function getTestListing(mdParams, data, vFormat) {
            }), FILTER_SKIP);

            if (vFormat === 'v0') {
-                assert.deepStrictEqual(listing.skipping(), `key${VID_SEP}version3\0`);
+                assert.deepStrictEqual(listing.skipping(), `key${VID_SEP}version3`);
            } else {
                assert.deepStrictEqual(listing.skipping(), [
-                    `${DbPrefixes.Master}key${VID_SEP}version3\0`,
-                    `${DbPrefixes.Version}key${VID_SEP}version3\0`,
+                    `${DbPrefixes.Master}key${VID_SEP}version3`,
+                    `${DbPrefixes.Version}key${VID_SEP}version3`,
                ]);
            }

--- a/Show More
+++ b/Show More
Author	SHA1	Message	Date
williamlardier	6b5139ebaa	ARSN-345: fixups	2023-06-08 11:16:12 +02:00
williamlardier	a48efc0f8b	ARSN-345: fixups	2023-06-08 09:08:01 +02:00
williamlardier	5b30e80c80	ARSN-345: linting	2023-06-07 18:44:42 +02:00
williamlardier	f08d066d82	ARSN-345: support batching and optimize	2023-06-07 18:25:24 +02:00