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https://issues.apache.org/jira/browse/YARN-4350?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15047052#comment-15047052
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Sangjin Lee commented on YARN-4350:
-----------------------------------

[~Naganarasimha]:
{quote}
I am not sure how to proceed with this jira, as its introduced by YARN-2859 but 
actual cause is YARN-4372. YARN-4372 not sure we have any definitive solution. 
as temporary fix shall i revert YARN-2859 solution and have my solution so that 
we can proceed smoothly till YARN-4372 has some proper solution?
{quote}

I agree. Can we go back to before YARN-2859 and restore this unit test for the 
time being? It's not clear if YARN-4372 has a quick solution.

> TestDistributedShell fails
> --------------------------
>
>                 Key: YARN-4350
>                 URL: https://issues.apache.org/jira/browse/YARN-4350
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: timelineserver
>    Affects Versions: YARN-2928
>            Reporter: Sangjin Lee
>            Assignee: Naganarasimha G R
>         Attachments: YARN-4350-feature-YARN-2928.001.patch
>
>
> Currently TestDistributedShell does not pass on the feature-YARN-2928 branch. 
> There seem to be 2 distinct issues.
> (1) testDSShellWithoutDomainV2* tests fail sporadically
> These test fail more often than not if tested by themselves:
> {noformat}
> testDSShellWithoutDomainV2DefaultFlow(org.apache.hadoop.yarn.applications.distributedshell.TestDistributedShell)
>   Time elapsed: 30.998 sec  <<< FAILURE!
> java.lang.AssertionError: Application created event should be published 
> atleast once expected:<1> but was:<0>
>       at org.junit.Assert.fail(Assert.java:88)
>       at org.junit.Assert.failNotEquals(Assert.java:743)
>       at org.junit.Assert.assertEquals(Assert.java:118)
>       at org.junit.Assert.assertEquals(Assert.java:555)
>       at 
> org.apache.hadoop.yarn.applications.distributedshell.TestDistributedShell.checkTimelineV2(TestDistributedShell.java:451)
>       at 
> org.apache.hadoop.yarn.applications.distributedshell.TestDistributedShell.testDSShell(TestDistributedShell.java:326)
>       at 
> org.apache.hadoop.yarn.applications.distributedshell.TestDistributedShell.testDSShellWithoutDomainV2DefaultFlow(TestDistributedShell.java:207)
> {noformat}
> They start happening after YARN-4129. I suspect this might have to do with 
> some timing issue.
> (2) the whole test times out
> If you run the whole TestDistributedShell test, it times out without fail. 
> This may or may not have to do with the port change introduced by YARN-2859 
> (just a hunch).



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