dajac commented on code in PR #17976:
URL: https://github.com/apache/kafka/pull/17976#discussion_r1867284781
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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:
I suppose that we should. However, as it is orthogonal to this PR, I suggest
to tackle it separately. Could you please file a jira for it?
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