[GitHub] [kafka] philipnee commented on a diff in pull request #13550: KAFKA-14639 - A single partition may be revoked and assign during a single round of rebalance

[via GitHub]

philipnee commented on code in PR #13550:
URL: https://github.com/apache/kafka/pull/13550#discussion_r1170094810


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clients/src/main/java/org/apache/kafka/clients/consumer/internals/AbstractCoordinator.java:
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@@ -835,6 +835,7 @@ public void handle(SyncGroupResponse syncResponse,
                 } else if (error == Errors.REBALANCE_IN_PROGRESS) {
                     log.info("SyncGroup failed: The group began another 
rebalance. Need to re-join the group. " +
                                  "Sent generation was {}", sentGeneration);
+                    resetStateAndGeneration("member missed the rebalance", 
true);

Review Comment:
   Hmm, I think the partitions are only lost during the onJoinPrepare, what I'm 
thinking is this: 
https://github.com/apache/kafka/blob/61530d68ce83467de6190a52da37b3c0af84f0ef/clients/src/main/java/org/apache/kafka/clients/consumer/internals/AbstractCoordinator.java#L507
   
   The gist is: on one of the 4 exception thrown in join/sync group, it should 
immediately re-send the join request. Are you thinking about the how client 
handles the illegal generation error? I think it is only being thrown during 
sync group and heartbeat. So I think by just resetting the generation shouldn't 
immediately causes revocation.



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