kirktrue commented on code in PR #15640:
URL: https://github.com/apache/kafka/pull/15640#discussion_r1579735209


##########
clients/src/main/java/org/apache/kafka/clients/consumer/internals/AsyncKafkaConsumer.java:
##########
@@ -1270,6 +1230,20 @@ private void close(Duration timeout, boolean 
swallowException) {
         if (applicationEventHandler != null)
             closeQuietly(() -> 
applicationEventHandler.close(Duration.ofMillis(closeTimer.remainingMs())), 
"Failed shutting down network thread", firstException);
         closeTimer.update();
+
+        if (backgroundEventReaper != null && backgroundEventQueue != null) {

Review Comment:
   They're only `null` if there was an error in the constructor. The 
constructor's `finally` block calls `close()`, so we need to handle the case 
where the consumer wasn't fully constructed before it's closed.



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