lianetm commented on code in PR #15640:
URL: https://github.com/apache/kafka/pull/15640#discussion_r1585091606


##########
clients/src/main/java/org/apache/kafka/clients/consumer/internals/AsyncKafkaConsumer.java:
##########
@@ -1892,13 +1897,13 @@ private void subscribeInternal(Collection<String> 
topics, Optional<ConsumerRebal
      * @return {@code true} if the event completed within the timeout, {@code 
false} otherwise
      */
     // Visible for testing
-    <T> T processBackgroundEvents(EventProcessor<?> eventProcessor,
+    <T> T processBackgroundEvents(EventProcessor<BackgroundEvent> 
eventProcessor,

Review Comment:
   Also, regarding:
   
   > as part of this rebalancing work, the {@link 
ConsumerRebalanceListener#onPartitionsRevoked(Collection)} callback needs to be 
invoked
   
   it does not need to if the consumer unsubscribing does not own any 
partition, so just for accuracy in the example I would suggest to extend it 
with "...needs to be invoked for the partitions the consumer owns"



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