frankvicky commented on code in PR #22552:
URL: https://github.com/apache/kafka/pull/22552#discussion_r3421397316


##########
group-coordinator/src/main/java/org/apache/kafka/coordinator/group/GroupMetadataManager.java:
##########
@@ -4466,7 +4472,13 @@ private CoordinatorResult<StreamsGroupHeartbeatResult, 
CoordinatorRecord> stream
         if (instanceId == null) {
             StreamsGroupMember member = group.getMemberOrThrow(memberId);
             log.info("[GroupId {}][MemberId {}] Member {} left the streams 
group.", groupId, memberId, memberId);
-            return streamsGroupFenceMember(group, member, new 
StreamsGroupHeartbeatResult(response, Map.of(), group.currentTopologyEpoch()));
+            return streamsGroupFenceMember(group, member, new 
StreamsGroupHeartbeatResult(
+                response,
+                Map.of(),
+                group.currentTopologyEpoch(),

Review Comment:
   I added a `StreamsGroupHeartbeatResult.withoutEpochContext(data)` static 
factory that defaults the three epoch fields to `-1`, and pulled the 
leave/fence sites onto it.



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