lkokhreidze commented on a change in pull request #9237:
URL: https://github.com/apache/kafka/pull/9237#discussion_r498383696



##########
File path: 
streams/src/main/java/org/apache/kafka/streams/processor/internals/InternalTopologyBuilder.java
##########
@@ -632,11 +632,21 @@ public final void addInternalTopic(final String topicName,
         internalTopicNamesWithProperties.put(topicName, 
internalTopicProperties);
     }
 
-    public final void copartitionSources(final Collection<String> sourceNodes) 
{
-        copartitionSourceGroups.add(Collections.unmodifiableSet(new 
HashSet<>(sourceNodes)));
+    public final synchronized void copartitionSources(final Collection<String> 
sourceNodes) {

Review comment:
       Thanks for confirming, removed synchronized.




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