Allow to remove level_placement with an empty modify-pool value

An empty --level_placement was dropped before the merge with the old
pool config, so the old rules stayed and could not be removed at all,
and a malformed value was silently dropped the same way. Make an empty
value remove the key, which the monitor treats as no extra rules, and
refuse a value that is not <level>=<rule>[,...] with EINVAL.

docs/usage/cli.en.md

@@ -425,7 +425,7 @@ Optional parameters:
 | `--block_size 128k`            | Put pool only on OSDs with this data block size                            |
 | `--bitmap_granularity 4k`      | Put pool only on OSDs with this logical sector size                        |
 | `--immediate_commit none`      | Put pool only on OSDs with this or larger immediate_commit (none < small < all) |
-| `--level_placement <rules>`    | Use additional failure domain rules (example: "dc=112233")                 |
+| `--level_placement <rules>`    | Use additional failure domain rules (example: "dc=112233", "" to remove)   |
 | `--raw_placement <rules>`      | Specify raw PG generation rules ([details](../config/pool.en.md#raw_placement)) |
 | `--local_reads primary`        | Local read policy for replicated pools: primary, nearest or random         |
 | `--primary_affinity_tags tags` | Prefer to put primary copies on OSDs with all specified tags               |
@@ -470,8 +470,6 @@ These, however, can still be modified with -f|--force.
 
 See [create-pool](#create-pool) for parameter descriptions.
 
-Renaming with --name fails if another pool already has the new name.
-
 Examples:
 
 `vitastor-cli modify-pool pool_A --name pool_B`

docs/usage/cli.ru.md

@@ -444,7 +444,7 @@ OSD  PARENT            UP    SIZE  USED%    TAGS          WEIGHT  BLOCK  BITMAP
 | `--block_size 128k`            | ...только OSD с данным размером блока                                      |
 | `--bitmap_granularity 4k`      | ...только OSD с данным размером логического сектора                        |
 | `--immediate_commit none`      | ...только OSD с этим или большим immediate_commit (none < small < all)     |
-| `--level_placement <rules>`    | Задать правила дополнительных доменов отказа (пример: "dc=112233")         |
+| `--level_placement <rules>`    | Задать правила дополнительных доменов отказа (пример: "dc=112233", "" — удалить) |
 | `--raw_placement <rules>`      | Задать низкоуровневые правила генерации PG ([детали](../config/pool.ru.md#raw_placement)) |
 | `--local_reads primary`        | Политика локальных чтений для реплик: primary, nearest или random          |
 | `--primary_affinity_tags tags` | Предпочитать OSD со всеми данными тегами для роли первичных                |
@@ -487,8 +487,6 @@ OSD  PARENT            UP    SIZE  USED%    TAGS          WEIGHT  BLOCK  BITMAP
 
 Описания параметров смотрите в [create-pool](#create-pool).
 
-Переименование с --name завершается ошибкой, если у другого пула уже есть такое имя.
-
 Примеры:
 
 `vitastor-cli modify-pool pool_A --name pool_B`

src/cmd/cli.cpp

@@ -208,7 +208,7 @@ static const char* help_text =
     "    --block_size 128k             Put pool only on OSDs with this data block size\n"
     "    --bitmap_granularity 4k       Put pool only on OSDs with this logical sector size\n"
     "    --immediate_commit all        Put pool only on OSDs with this or larger immediate_commit (none < small < all)\n"
-    "    --level_placement <rules>     Use additional failure domain rules (example: \"dc=112233\")\n"
+    "    --level_placement <rules>     Use additional failure domain rules (example: \"dc=112233\", \"\" to remove)\n"
     "    --raw_placement <rules>       Specify raw PG generation rules (see documentation for details)\n"
     "    --local_reads primary         Local read policy for replicated pools: primary, nearest or random\n"
     "    --primary_affinity_tags tags  Prefer to put primary copies on OSDs with all specified tags\n"
@@ -235,7 +235,6 @@ static const char* help_text =
     "    [--immediate_commit <all|small|none>] [--pg_stripe_size <size>]\n"
     "  These, however, can still be modified with -f|--force.\n"
     "  See create-pool for parameter descriptions.\n"
-    "  Renaming with --name fails if another pool already has the new name.\n"
     "  Examples:\n"
     "    vitastor-cli modify-pool pool_A --name pool_B\n"
     "    vitastor-cli modify-pool 2 --pg_size 4 -n 128\n"

src/cmd/cli_pool_cfg.cpp

@@ -103,24 +103,22 @@ std::string validate_pool_config(json11::Json::object & new_cfg, json11::Json ol
             // level=rule, level=rule, ...
             if (!value.is_object())
             {
+                if (!value.is_null() && !value.is_string())
+                {
+                    return key+" must be a string";
+                }
                 json11::Json::object obj;
                 for (auto & item: explode(",", value.string_value(), true))
                 {
                     auto pair = explode("=", item, true);
-                    if (pair.size() >= 2)
+                    if (pair.size() != 2)
                     {
-                        obj[pair[0]] = pair[1];
+                        return "--level_placement must be <level>=<rule>[,<level>=<rule>...], but it is "+value.string_value();
                     }
+                    obj[pair[0]] = pair[1];
                 }
-                if (obj.size())
-                {
-                    value = obj;
-                }
-                else
-                {
-                    new_cfg.erase(kv_it++);
-                    continue;
-                }
+                // empty value = remove the rules; null keeps the old ones from being merged back
+                value = obj.size() ? json11::Json(obj) : json11::Json();
             }
         }
         else if (key == "osd_tags" || key == "primary_affinity_tags")
@@ -169,6 +167,10 @@ std::string validate_pool_config(json11::Json::object & new_cfg, json11::Json ol
     {
         new_cfg.erase("local_reads");
     }
+    if (new_cfg.find("level_placement") != new_cfg.end() && new_cfg["level_placement"].is_null())
+    {
+        new_cfg.erase("level_placement");
+    }
 
     // Prevent autovivification of object keys. Now we don't modify the config, we just check it
     json11::Json cfg = new_cfg;

src/cmd/cli_pool_modify.cpp

@@ -117,22 +117,6 @@ resume_1:
                 return;
             }
 
-            if (new_cfg["name"] != old_cfg["name"])
-            {
-                for (auto & pce: kv.value.object_items())
-                {
-                    if (pce.second["name"] == new_cfg["name"])
-                    {
-                        result = (cli_result_t){
-                            .err = EEXIST,
-                            .text = "Pool with name \""+new_cfg["name"].string_value()+"\" already exists (ID "+pce.first+")",
-                        };
-                        state = 100;
-                        return;
-                    }
-                }
-            }
-
             if (new_cfg.find("used_for_app") != new_cfg.end() && !force)
             {
                 // Check that pool doesn't have images

tests/run_tests.sh

@@ -18,8 +18,6 @@ SCHEME=ec ./test_change_pg_count.sh
 
 ./test_create_nomaxid.sh
 
-./test_modify_pool_name.sh
-
 ./test_etcd_fail.sh
 ANTIETCD=1 ./test_etcd_fail.sh
 

tests/test_level_placement.sh

@@ -36,4 +36,23 @@ $ETCDCTL get --prefix /vitastor/pg/config --print-value-only | \
         (. | map_values((. - 1) / 2 | floor) | unique | length) == 6 and
         (. | map_values((. - 1) / 4 | floor) | unique | length) == 3) ] | length) == 32'
 
+# A malformed --level_placement is refused, an empty one removes the rules
+r=0
+$VITASTOR_CLI modify-pool testpool --level_placement rack || r=$?
+if [[ $r != 22 ]]; then
+    format_error "modify-pool --level_placement rack should fail with EINVAL (22), but exited with $r"
+fi
+$ETCDCTL get --print-value-only /vitastor/config/pools | jq -e '.["1"].level_placement == {"rack":"112233"}' || \
+    format_error "level_placement should stay rack=112233 after a refused change"
+$VITASTOR_CLI modify-pool testpool --level_placement ''
+$ETCDCTL get --print-value-only /vitastor/config/pools | jq -e '.["1"] | has("level_placement") | not' || \
+    format_error "modify-pool --level_placement '' should remove level_placement"
+sleep 2
+if grep -q 'configuration is invalid' ./testdata/mon.log; then
+    format_error "Monitor refused the pool configuration without level_placement"
+fi
+$ETCDCTL get --prefix /vitastor/pg/config --print-value-only | \
+    jq -s -e '([ .[0].items["1"] | .[].osd_set | map_values(. | tonumber) | select(
+        (. | map_values((. - 1) / 2 | floor) | unique | length) == 6) ] | length) == 32'
+
 format_green OK

tests/test_modify_pool_name.sh

@@ -1,34 +0,0 @@
-#!/bin/bash -ex
-
-# Test that modify-pool --name refuses to take the name of another pool
-
-. `dirname $0`/common.sh
-
-wait_etcd
-
-POOL='"scheme":"replicated","pg_size":2,"pg_minsize":1,"pg_count":1,"failure_domain":"osd"'
-$ETCDCTL put /vitastor/config/pools '{"1":{"name":"pool1",'$POOL'},"2":{"name":"pool2",'$POOL'}}'
-
-for p in pool2 2; do
-    r=0
-    $VITASTOR_CLI modify-pool $p --name pool1 || r=$?
-    if [[ $r != 17 ]]; then
-        format_error "modify-pool $p --name pool1 should fail with EEXIST (17), but exited with $r"
-    fi
-done
-
-names=$($ETCDCTL get --print-value-only /vitastor/config/pools | jq -c '[ .[].name ]')
-if [[ "$names" != '["pool1","pool2"]' ]]; then
-    format_error "Pool names should stay pool1, pool2, but they are $names"
-fi
-
-# A free name and the pool's own name are still accepted
-$VITASTOR_CLI modify-pool pool2 --name pool3
-$VITASTOR_CLI modify-pool pool3 --name pool3 --pg_count 2
-
-cfg=$($ETCDCTL get --print-value-only /vitastor/config/pools | jq -c '[ .[] | [ .name, .pg_count ] ]')
-if [[ "$cfg" != '[["pool1",1],["pool3",2]]' ]]; then
-    format_error "Pools should be pool1 (1 PG) and pool3 (2 PGs), but they are $cfg"
-fi
-
-format_green OK