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https://issues.apache.org/jira/browse/SOLR-17000?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17769311#comment-17769311
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Chris M. Hostetter commented on SOLR-17000:
-------------------------------------------
/cc [~krisden]
> ExecutorUtilTest failures due to bad concurrency assumptions in test logic
> --------------------------------------------------------------------------
>
> Key: SOLR-17000
> URL: https://issues.apache.org/jira/browse/SOLR-17000
> Project: Solr
> Issue Type: Test
> Security Level: Public(Default Security Level. Issues are Public)
> Reporter: Chris M. Hostetter
> Assignee: Chris M. Hostetter
> Priority: Major
> Attachments: SOLR-17000.patch,
> apache_solr_Solr-check-9.3_647.log.txt, apache_solr_Solr-check-9.3_665.log.txt
>
>
> The basic logic of {{ExecutorUtilTest.testExecutorUtilAwaitsTerminationEnds}}
> in psuedo code is...
> {code:java}
> Future f = executorService.submit(newTaskSleepAndIgnoreInterupts(300ms))
> // L45
> executorService.shutdownNow();
> // L46
> assertThrows(RuntimeException,
> // L47
> ExecutorUtil.awaitTermination(executorService, 100ms)
> // Thread should not have finished in await termination.
>
> assertFalse(f.isDone());
> // L53
> {code}
> There are at least two concurrency assumptions here that are not guaranteed
> to be true, and occasionally cause jenkins failures...
> * There is no guarantee that the task submitted on line 45 will start before
> the {{shutdownNow()}} call on line 46 – which means {{awaitTermination()}}
> can succeed w/o throwing an exception:
> {noformat}
> // apache_solr_Solr-check-9.3_665.log.txt
> org.apache.solr.common.util.ExecutorUtilTest >
> testExecutorUtilAwaitsTerminationEnds FAILED
> java.lang.AssertionError: expected java.lang.RuntimeException to be
> thrown, but nothing was thrown
> at
> __randomizedtesting.SeedInfo.seed([7169EEE284A03087:DFB4E65167A857BF]:0)
> at org.junit.Assert.assertThrows(Assert.java:1028)
> at org.junit.Assert.assertThrows(Assert.java:981)
> at
> org.apache.solr.common.util.ExecutorUtilTest.testExecutorUtilAwaitsTerminationEnds(ExecutorUtilTest.java:47)
> {noformat}
> * From the perspective of the test thread, it's guaranteed that _at least_
> 100ms has elapsed (since line 45) by the time {{awaitTermination()}} returns,
> but that doesn't preclude the possibility that a full 300ms has elapsed, and
> the background thread has already finished the task, so that by the time the
> test thread gets to line 53, {{Future.isDone()}} may return true:
> {noformat}
> // apache_solr_Solr-check-9.3_647.log.txt
> org.apache.solr.common.util.ExecutorUtilTest >
> testExecutorUtilAwaitsTerminationEnds FAILED
> java.lang.AssertionError
> at __randomizedtesting.SeedInfo.seed([F7AFD5785E583017:5972DDCBBD50572F]:0)
> at org.junit.Assert.fail(Assert.java:87)
> at org.junit.Assert.assertTrue(Assert.java:42)
> at org.junit.Assert.assertFalse(Assert.java:65)
> at org.junit.Assert.assertFalse(Assert.java:75)
> at
> org.apache.solr.common.util.ExecutorUtilTest.testExecutorUtilAwaitsTerminationEnds(ExecutorUtilTest.java:53)
> {noformat}
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