lianetm commented on code in PR #15271:
URL: https://github.com/apache/kafka/pull/15271#discussion_r1467947528


##########
clients/src/main/java/org/apache/kafka/clients/consumer/internals/MembershipManagerImpl.java:
##########
@@ -1311,21 +1294,34 @@ public Map<Uuid, SortedSet<Integer>> 
currentAssignment() {
         return this.currentAssignment;
     }
 
-
     /**
      * @return Set of topic IDs received in a target assignment that have not 
been reconciled yet
-     * because topic names are not in metadata. Visible for testing.
+     * because topic names are not in metadata or reconciliation hasn't 
finished. Visible for testing.
      */
-    Set<Uuid> topicsWaitingForMetadata() {
-        return Collections.unmodifiableSet(assignmentUnresolved.keySet());
+    Set<Uuid> topicsAwaitingReconciliation() {

Review Comment:
   We are slightly changing the concept of what this does, and I'm fine with it 
because it's ok for how it's used in the tests, but I think the 
description/name/implementation are not well aligned? This is not strictly 
getting topicsAwaitingReconciliation ("not in metadata or reconciliation hasn't 
finished"), ex. member owns one partitions of the topic, and another one is 
being added and stuck reconciling (committing offsets, revoking, etc), that 
topic wouldn't be returned here but it's indeed a 
`topicsAwaitingReconciliation` (for which "reconciliation hasn't finished"). 
What about we just rely on the`topicPartitionsAwaitingReconciliation` you 
defined below (that seems accurate to me), and here we just `return 
topicPartitionsAwaitingReconciliation().keySet();`
   I do know this is not causing trouble because of how it is used in the tests 
but better to get it right to avoid confusion/misuse.



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