coltmcnealy-lh commented on code in PR #17527:
URL: https://github.com/apache/kafka/pull/17527#discussion_r1835767677


##########
clients/src/test/java/org/apache/kafka/clients/producer/internals/SenderTest.java:
##########
@@ -567,6 +567,44 @@ public void testMetadataTopicExpiry() throws Exception {
         assertTrue(future.isDone(), "Request should be completed");
     }
 
+    @Test
+    public void 
senderThreadShouldNotGetStuckWhenThrottledAndAddingPartitionsToTxn() {
+        // We want MockClient#poll() to advance time so that eventually the 
backoff expires.
+        client.setAdvanceTimeDuringPoll(true);

Review Comment:
   I tried that. However, the problem is that the thing we want to test is not 
how many times we call `time.milliseconds()` but rather what values are passed 
into `NetworkClient#poll()`.
   
   I wasn't able to find a way to use this strategy to get a test that failed 
on `trunk` and passed on my branch.



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