use setOnInsert and min

For putObjectVerCase4, we create an isPHD master on each
versioned put. Add a repair process to replace master isPHD
with the correct masters' value.

lib/storage/metadata/mongoclient/MongoClientInterface.js

@@ -538,7 +538,13 @@ class MongoClientInterface {
                     _id: objName,
                 },
                 update: {
-                    _id: objName, value: mst,
+                    $min: {
+                        'value.versionId': params.versionId,
+                    },
+                    $setOnInsert: {
+                        '_id': objName,
+                        'value.isPHD': true,
+                    },
                 },
                 upsert: true,
             },
@@ -551,6 +557,11 @@ class MongoClientInterface {
                 });
                 return cb(errors.InternalError);
             }
+            // Attempt to repair master
+            setTimeout(() => {
+                this.asyncRepair(c, bucketName, objName, mst, log,
+                    { action: 'put' });
+            }, ASYNC_REPAIR_TIMEOUT);
             return cb(null, `{"versionId": "${objVal.versionId}"}`);
         });
     }
@@ -696,13 +707,26 @@ class MongoClientInterface {
      * Get the latest version and repair. The process is safe because
      * we never replace a non-PHD master
      */
-    asyncRepair(c, bucketName, objName, mst, log) {
+    asyncRepair(c, bucketName, objName, mst, log, options) {
         this.getLatestVersion(c, objName, log, (err, value) => {
             if (err) {
                 log.error('async-repair: getting latest version',
                 { error: err.message });
                 return undefined;
             }
+            // if a PHD was created on put, compare latest version with
+            // the version id saved on PHD
+            if (options && options.action === 'put') {
+                console.log('\n==== IN ASYNC REPAIR ====')
+                console.log('RECEIVED ACTION PUT')
+                console.log(`${value.versionId} !== ${mst.versionId}`)
+                // if version id does not match, PHD has been replaced and
+                // we should ignore this repair
+                if (value.versionId !== mst.versionId) {
+                    console.log('VERSION ID DOES NOT MATCH, IGNORE THIS REPAIR')
+                    return undefined;
+                }
+            }
             this.repair(c, bucketName, objName, value, mst, log, err => {
                 if (err) {
                     log.error('async-repair failed', { error: err.message });