RivenSun2 commented on a change in pull request #11340:
URL: https://github.com/apache/kafka/pull/11340#discussion_r742560824



##########
File path: 
clients/src/main/java/org/apache/kafka/clients/consumer/internals/AbstractCoordinator.java
##########
@@ -420,9 +421,14 @@ boolean joinGroupIfNeeded(final Timer timer) {
                 // need to set the flag before calling onJoinPrepare since the 
user callback may throw
                 // exception, in which case upon retry we should not retry 
onJoinPrepare either.
                 needsJoinPrepare = false;
-                onJoinPrepare(generation.generationId, generation.memberId);
+                if (!onJoinPrepare(generation.generationId, 
generation.memberId))

Review comment:
       If you do
   This goal should not be achieved:
   ```
   if (!onJoinPrepare(generation.generationId, generation.memberId))
        needsJoinPrepare = true;
   ```




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