jeffkbkim commented on code in PR #15364:
URL: https://github.com/apache/kafka/pull/15364#discussion_r1508179840


##########
group-coordinator/src/main/java/org/apache/kafka/coordinator/group/GroupMetadataManager.java:
##########
@@ -1211,13 +1193,71 @@ private 
CoordinatorResult<ConsumerGroupHeartbeatResponseData, Record> consumerGr
         // 1. The member reported its owned partitions;
         // 2. The member just joined or rejoined to group (epoch equals to 
zero);
         // 3. The member's assignment has been updated.
-        if (ownedTopicPartitions != null || memberEpoch == 0 || 
assignmentUpdated) {
+        if (ownedTopicPartitions != null || memberEpoch == 0 || 
hasAssignedPartitionsChanged(member, updatedMember)) {
             response.setAssignment(createResponseAssignment(updatedMember));
         }
 
         return new CoordinatorResult<>(records, response);
     }
 
+    /**
+     * Reconciles the current assignment of the member if needed.

Review Comment:
   Can we add a bit more description on what "reconcile" means here?



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