dajac commented on code in PR #17976:
URL: https://github.com/apache/kafka/pull/17976#discussion_r1862515910


##########
group-coordinator/src/main/java/org/apache/kafka/coordinator/group/GroupMetadataManager.java:
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@@ -6128,11 +6183,11 @@ private CoordinatorResult<LeaveGroupResponseData, 
CoordinatorRecord> classicGrou
                     // in which case we expect the MemberId to be undefined.
                     if (!UNKNOWN_MEMBER_ID.equals(memberId)) {
                         throwIfInstanceIdIsFenced(member, groupId, memberId, 
instanceId);
+                        throwIfMemberDoesNotUseClassicProtocol(member);

Review Comment:
   This is the fix for https://issues.apache.org/jira/browse/KAFKA-18116. 
@dongnuo123 What do you think about it?



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