[jira] [Created] (KAFKA-7604) Flaky Test `ConsumerCoordinatorTest.testRebalanceAfterTopicUnavailableWithPatternSubscribe`

["Jason Gustafson (JIRA)" <ji...@apache.org>]

Jason Gustafson created KAFKA-7604:
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             Summary: Flaky Test `ConsumerCoordinatorTest.testRebalanceAfterTopicUnavailableWithPatternSubscribe`
                 Key: KAFKA-7604
                 URL: https://issues.apache.org/jira/browse/KAFKA-7604
             Project: Kafka
          Issue Type: Bug
          Components: unit tests
            Reporter: Jason Gustafson
            Assignee: Jason Gustafson


{code}
java.lang.AssertionError: Metadata refresh requested unnecessarily
	at org.junit.Assert.fail(Assert.java:88)
	at org.junit.Assert.assertTrue(Assert.java:41)
	at org.junit.Assert.assertFalse(Assert.java:64)
	at org.apache.kafka.clients.consumer.internals.ConsumerCoordinatorTest.unavailableTopicTest(ConsumerCoordinatorTest.java:1034)
	at org.apache.kafka.clients.consumer.internals.ConsumerCoordinatorTest.testRebalanceAfterTopicUnavailableWithPatternSubscribe(ConsumerCoordinatorTest.java:984)
{code}

The problem seems to be a race condition in the test case with the heartbeat thread and the foreground thread unsafely attempting to update metadata at the same time.



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