lianetm commented on code in PR #15869:
URL: https://github.com/apache/kafka/pull/15869#discussion_r1622585236
##########
clients/src/test/java/org/apache/kafka/clients/consumer/internals/AsyncKafkaConsumerTest.java:
##########
@@ -463,6 +466,44 @@ public void onPartitionsAssigned(final
Collection<TopicPartition> partitions) {
assertTrue(callbackExecuted.get());
}
+ @Test
+ public void testCheckForNewTopicOnlyWhenMetadataChange() {
+ SubscriptionState subscriptions = mock(SubscriptionState.class);
+ Cluster cluster = mock(Cluster.class);
+
+ consumer = newConsumer(
+ mock(FetchBuffer.class),
+ mock(ConsumerInterceptors.class),
+ mock(ConsumerRebalanceListenerInvoker.class),
+ subscriptions,
+ singletonList(new RoundRobinAssignor()),
+ "group-id",
+ "client-id");
+
+ final String topicName = "foo";
+ final int partition = 3;
+ final TopicPartition tp = new TopicPartition(topicName, partition);
+
doReturn(Fetch.empty()).when(fetchCollector).collectFetch(any(FetchBuffer.class));
+ Map<TopicPartition, OffsetAndMetadata> offsets =
Collections.singletonMap(tp, new OffsetAndMetadata(1));
+ completeFetchedCommittedOffsetApplicationEventSuccessfully(offsets);
+
doReturn(LeaderAndEpoch.noLeaderOrEpoch()).when(metadata).currentLeader(any());
+ doReturn(cluster).when(metadata).fetch();
+ doReturn(Collections.singleton(topicName)).when(cluster).topics();
+
+ consumer.subscribe(Pattern.compile("f*"));
+ verify(metadata).requestUpdateForNewTopics();
+ verify(subscriptions).matchesSubscribedPattern(topicName);
+ clearInvocations(subscriptions);
+
+ consumer.poll(Duration.ZERO);
Review Comment:
```suggestion
when(subscriptions.hasPatternSubscription()).thenReturn(true);
consumer.poll(Duration.ZERO);
```
Let's ensure that the poll knows it has pattern subscription (so that we
know that nothing is blocking the way to eval the regex on ln 1976 of the
AsyncConsumer. Just the metadata version check we're testing blocks it). This
is what will make sure that if we loose the check by mistake, the test will
actually fail.
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