frankvicky commented on code in PR #16833:
URL: https://github.com/apache/kafka/pull/16833#discussion_r1712886655


##########
clients/src/test/java/org/apache/kafka/clients/consumer/internals/CommitRequestManagerTest.java:
##########
@@ -1204,10 +1199,18 @@ private void testRetriable(final CommitRequestManager 
commitRequestManager,
                                final 
List<CompletableFuture<Map<TopicPartition, OffsetAndMetadata>>> futures) {
         futures.forEach(f -> assertFalse(f.isDone()));
 
-        // The manager should backoff for 100ms
-        time.sleep(100);
-        commitRequestManager.poll(time.milliseconds());
+        NetworkClientDelegate.PollResult poll = 
commitRequestManager.poll(time.milliseconds());
+        assertEquals(0, poll.unsentRequests.size());
+        // The manager should backoff before retry
+        time.sleep(retryBackoffMs);
+        poll = commitRequestManager.poll(time.milliseconds());
+        assertEquals(1, poll.unsentRequests.size());
         futures.forEach(f -> assertFalse(f.isDone()));
+        // Sleep util timeout
+        time.sleep(defaultApiTimeoutMs);
+        poll = commitRequestManager.poll(time.milliseconds());
+        assertEquals(0, poll.unsentRequests.size());
+        futures.forEach(f -> assertTrue(f.isCompletedExceptionally()));

Review Comment:
   It seems that `future` doesn't complete exceptionally with 
`TimeoutException` even we sleep for timeout.
   I'm investigating this. 



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