dajac commented on code in PR #23174:
URL: https://github.com/apache/kafka/pull/23174#discussion_r3794753424
##########
group-coordinator/src/main/java/org/apache/kafka/coordinator/group/GroupMetadataManager.java:
##########
@@ -7706,6 +7706,15 @@ private CoordinatorResult<Void, CoordinatorRecord>
updateMemberThenRebalanceOrCo
String joinReason,
CompletableFuture<JoinGroupResponseData> responseFuture
) {
+ // A prior JoinGroup for this member may still be pending; complete it
before
+ // group.updateMember discards it, or it would never resolve on its
own.
+ if (member.isAwaitingJoin()) {
+ group.completeJoinFuture(member, new JoinGroupResponseData()
Review Comment:
Have you considered pushing this logic down into `ClassicGroupMember`? It
would ensure that we always complete the previous one whenever a new one is set.
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