squah-confluent commented on code in PR #19967:
URL: https://github.com/apache/kafka/pull/19967#discussion_r2307448948


##########
group-coordinator/src/main/java/org/apache/kafka/coordinator/group/GroupMetadataManager.java:
##########
@@ -1913,6 +1914,11 @@ private CoordinatorResult<StreamsGroupHeartbeatResult, 
CoordinatorRecord> stream
         // to persist the change, and bump the group epoch later.
         boolean bumpGroupEpoch = hasStreamsMemberMetadataChanged(groupId, 
member, updatedMember, records);
 
+        // Check if StreamsGroup has flag rebalanceRequired equals to true
+        if (group.rebalanceRequired()) {
+            bumpGroupEpoch = true;
+        }
+

Review Comment:
   Instead of adding a new flag, we can bump the epoch directly when a config 
of interest changes and this will trigger a new assignment on the next 
heartbeat. As an example, we do this in `handleRegularExpressionsResult` to 
trigger a new assignment on the next heartbeat.



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