vamossagar12 commented on code in PR #14432:
URL: https://github.com/apache/kafka/pull/14432#discussion_r1399522392


##########
group-coordinator/src/main/java/org/apache/kafka/coordinator/group/GroupMetadataManager.java:
##########
@@ -671,6 +688,10 @@ private void throwIfConsumerGroupHeartbeatRequestIsInvalid(
             if (request.subscribedTopicNames() == null || 
request.subscribedTopicNames().isEmpty()) {
                 throw new InvalidRequestException("SubscribedTopicNames must 
be set in first request.");
             }
+        } else if (request.memberEpoch() == LEAVE_GROUP_STATIC_MEMBER_EPOCH) {
+            throwIfEmptyString(request.memberId(), "MemberId can't be empty.");
+            throwIfNull(request.instanceId(), "InstanceId can't be null or 
empty for Static Member. GroupId: "

Review Comment:
   sure. `instance id should not be empty` check is already happening 
[here](https://github.com/apache/kafka/blob/trunk/group-coordinator/src/main/java/org/apache/kafka/coordinator/group/GroupMetadataManager.java#L658)



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