[jira] [Created] (PHOENIX-6284) Flaky test UpgradeIT.testConcurrentUpgradeThrowsUpgradeInProgressException

["Viraj Jasani (Jira)" <ji...@apache.org>]

Viraj Jasani created PHOENIX-6284:
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             Summary: Flaky test UpgradeIT.testConcurrentUpgradeThrowsUpgradeInProgressException
                 Key: PHOENIX-6284
                 URL: https://issues.apache.org/jira/browse/PHOENIX-6284
             Project: Phoenix
          Issue Type: Test
            Reporter: Viraj Jasani


UpgradeIT.testConcurrentUpgradeThrowsUpgradeInProgressException is sometimes failing with error logs:
{code:java}
java.lang.AssertionError: One and only one thread should have acquired the mutex . Actual: true
	at org.junit.Assert.fail(Assert.java:89)
	at org.junit.Assert.failEquals(Assert.java:187)
	at org.junit.Assert.assertNotEquals(Assert.java:163)
	at org.apache.phoenix.end2end.UpgradeIT.testConcurrentUpgradeThrowsUprgadeInProgressException(UpgradeIT.java:237)
{code}
While testing if 2 threads can simultaneously acquire lock, we release the lock immediately in finally for individual thread if it had acquired the mutex. This can lead to failure if one of the threads starts executing (due to slowness) only after the other thread releases mutex cell. In that case, the sequence of mutex acquisition would be:

Thread1 acquires -> Thread1 releases -> Thread2 acquires -> Thread2 releases

Because of this sequence, the above mentioned AssertionError can occur.



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