lianetm commented on code in PR #15961:
URL: https://github.com/apache/kafka/pull/15961#discussion_r1601985896


##########
clients/src/test/java/org/apache/kafka/clients/consumer/KafkaConsumerTest.java:
##########
@@ -2974,7 +2974,7 @@ public void testSubscriptionOnInvalidTopic(GroupProtocol 
groupProtocol) {
         KafkaConsumer<String, String> consumer = newConsumer(groupProtocol, 
time, client, subscription, metadata, assignor, true, groupInstanceId);
         consumer.subscribe(singleton(invalidTopicName), 
getConsumerRebalanceListener(consumer));
 
-        assertThrows(InvalidTopicException.class, () -> 
consumer.poll(Duration.ZERO));
+        assertThrows(InvalidTopicException.class, () -> 
consumer.poll(Duration.ofMillis(100)));

Review Comment:
   I'm guessing you had to change the poll timeout here to make the test pass? 
Definitely a sign that we have some issues still. We should be able to keep the 
test as it was, passing with poll(0), as it does for the legacy consumer. I 
would suggest to address my concern above, and then review this to know if 
there is something else making the test fail with poll(0)



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