philipnee commented on code in PR #14937:
URL: https://github.com/apache/kafka/pull/14937#discussion_r1424433876


##########
clients/src/main/java/org/apache/kafka/clients/consumer/internals/AsyncKafkaConsumer.java:
##########
@@ -1050,6 +1062,81 @@ private void close(Duration timeout, boolean 
swallowException) {
         }
     }
 
+    /**
+     * Prior to closing the network thread, we need to make sure the following 
operations happen in the right sequence:
+     * 1. autocommit offsets
+     * 2. revoke all partitions
+     */
+    private void prepareShutdown(final Timer timer, final 
AtomicReference<Throwable> firstException) {
+        if (!groupMetadata.isPresent())
+            return;
+        maybeAutoCommitSync(timer, firstException);
+        timer.update();
+        waitOnEventCompletion(new 
ConsumerCloseApplicationEvent(ConsumerCloseApplicationEvent.Task.COMMIT, 
timer.remainingMs()), timer, firstException);
+        maybeInvokeCommitCallbacks();
+        maybeRevokePartitions(timer, firstException);
+        waitOnEventCompletion(new 
ConsumerCloseApplicationEvent(ConsumerCloseApplicationEvent.Task.LEAVE_GROUP, 
timer.remainingMs()), timer, firstException);
+    }
+
+    private void waitOnEventCompletion(final ConsumerCloseApplicationEvent 
event,
+                                       final Timer timer,
+                                       final AtomicReference<Throwable> 
firstException) {
+        try {
+            applicationEventHandler.addAndGet(event, timer);
+        } catch (TimeoutException e) {

Review Comment:
   @kirktrue and I discussed the potential tasks for dealing with zero timeout. 
 This needs to be examined perhaps after the preview. So we will spin off a 
jira ticket for this specific issue.



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