kirktrue commented on code in PR #14432:
URL: https://github.com/apache/kafka/pull/14432#discussion_r1344754813


##########
group-coordinator/src/main/java/org/apache/kafka/coordinator/group/GroupMetadataManager.java:
##########
@@ -593,6 +609,9 @@ private void throwIfConsumerGroupHeartbeatRequestIsInvalid(
             if (request.subscribedTopicNames() == null || 
request.subscribedTopicNames().isEmpty()) {
                 throw new InvalidRequestException("SubscribedTopicNames must 
be set in first request.");
             }
+        } else if (request.memberEpoch() == -2) {
+            throwIfEmptyString(request.memberId(), "MemberId can't be empty.");

Review Comment:
   It's just my preference, so if there's precedent for how you have it, I 
wouldn't hold up this PR in an effort to change the other places. Thanks!



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