thomasmueller commented on code in PR #646:
URL: https://github.com/apache/jackrabbit-oak/pull/646#discussion_r937448763


##########
oak-store-document/src/main/java/org/apache/jackrabbit/oak/plugins/document/mongo/MongoDocumentStore.java:
##########
@@ -1411,7 +1411,7 @@ public <T extends Document> void prefetch(Collection<T> 
collection,
         List<String> resultKeys = new ArrayList<>(keys.size());
         CacheChangesTracker tracker = null;
         if (collection == Collection.NODES) {
-            tracker = nodesCache.registerTracker(keys);
+            tracker = nodesCache.registerTracker(new HashSet<>(keys));

Review Comment:
   Please ignore my comments about compression and ordering... I see now this 
doesn't apply here.
   
   But "keys" is already "Set<String> keys = new HashSet<>();", and you wrapped 
that inside a new HashSet, what is the reason?
   
   



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