[jira] [Commented] (OOZIE-1855) TestPriorityDelayQueue#testPoll failed intermittently in Jenkins

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

    [ https://issues.apache.org/jira/browse/OOZIE-1855?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14006377#comment-14006377 ] 

Ostap commented on OOZIE-1855:
------------------------------

I couldn't reproduce this mistake locally and on jenkins machine
but when i changed Thread.sleep(11) to Thread.sleep(4) i got the same mistake.
now i enlarged this unit to Thread.sleep(20)
This test check the poll from PriorityDelayQueue which is based on java standart DelayQueue.
The element is added to queue with delay.
{noformat}
q.offer(new PriorityDelayQueue.QueueElement<Integer>(2, 0, 10, TimeUnit.MILLISECONDS));
{noformat}
delay = 10 ms, so element should be available in queue after 10 ms.
after that
{noformat}
Thread.sleep(11);
assertEquals((Integer) 2, q.poll().getElement()); //NullPointerException
{noformat}
but probably sometimes 11 ms isn't enough to retrieve element
it's fluky bug and was passed in last few runs. It can happen because Thread.sleep(11) not exactly calculated in OS

> TestPriorityDelayQueue#testPoll failed intermittently in Jenkins
> ----------------------------------------------------------------
>
>                 Key: OOZIE-1855
>                 URL: https://issues.apache.org/jira/browse/OOZIE-1855
>             Project: Oozie
>          Issue Type: Bug
>         Environment: Windows
>            Reporter: Ostap
>            Assignee: Ostap
>         Attachments: BUG-18115.patch
>
>
> Test failed with the next error:
> {noformat}
> java.lang.NullPointerException
> 	at org.apache.oozie.util.TestPriorityDelayQueue.testPoll(TestPriorityDelayQueue.java:167)
> 	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> 	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
> 	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
> 	at java.lang.reflect.Method.invoke(Method.java:601)
> 	at junit.framework.TestCase.runTest(TestCase.java:168)
> 	at junit.framework.TestCase.runBare(TestCase.java:134)
> 	at junit.framework.TestResult$1.protect(TestResult.java:110)
> 	at junit.framework.TestResult.runProtected(TestResult.java:128)
> 	at junit.framework.TestResult.run(TestResult.java:113)
> 	at junit.framework.TestCase.run(TestCase.java:124)
> 	at junit.framework.TestSuite.runTest(TestSuite.java:243)
> 	at junit.framework.TestSuite.run(TestSuite.java:238)
> 	at org.junit.internal.runners.JUnit38ClassRunner.run(JUnit38ClassRunner.java:83)
> 	at org.apache.maven.surefire.junitcore.ClassDemarcatingRunner.run(ClassDemarcatingRunner.java:58)
> 	at org.junit.runners.Suite.runChild(Suite.java:128)
> 	at org.junit.runners.Suite.runChild(Suite.java:24)
> 	at org.junit.runners.ParentRunner$3.run(ParentRunner.java:231)
> 	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
> 	at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334)
> 	at java.util.concurrent.FutureTask.run(FutureTask.java:166)
> 	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
> 	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
> 	at java.lang.Thread.run(Thread.java:722)
> {noformat}



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