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https://issues.apache.org/jira/browse/YARN-5973?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Dibyendu Karmakar updated YARN-5973:
------------------------------------
    Attachment: YARN-5973-branch-2.8.0.001.patch

> TestCapacitySchedulerSurgicalPreemption sometimes fails
> -------------------------------------------------------
>
>                 Key: YARN-5973
>                 URL: https://issues.apache.org/jira/browse/YARN-5973
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: capacity scheduler, scheduler preemption
>    Affects Versions: 2.8.0
>            Reporter: Eric Payne
>            Priority: Minor
>         Attachments: YARN-5973-branch-2.8.0.001.patch
>
>
> The tests in {{TestCapacitySchedulerSurgicalPreemption}} appear to be racy. 
> They often pass, but  the following errors sometimes occur:
> {noformat}
> testSimpleSurgicalPreemption(org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.TestCapacitySchedulerSurgicalPreemption)
>   Time elapsed: 14.671 sec  <<< FAILURE!
> java.lang.AssertionError: null
>       at org.junit.Assert.fail(Assert.java:86)
>       at org.junit.Assert.fail(Assert.java:95)
>       at 
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.CapacitySchedulerPreemptionTestBase.waitNumberOfLiveContainersFromApp(CapacitySchedulerPreemptionTestBase.java:110)
>       at 
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.TestCapacitySchedulerSurgicalPreemption.testSimpleSurgicalPreemption(TestCapacitySchedulerSurgicalPreemption.java:143)
> {noformat}
> {noformat}
> testSurgicalPreemptionWithAvailableResource(org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.TestCapacitySchedulerSurgicalPreemption)
>   Time elapsed: 9.503 sec  <<< FAILURE!
> java.lang.AssertionError: expected:<3> but was:<2>
>       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.junit.Assert.assertEquals(Assert.java:542)
>       at 
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.TestCapacitySchedulerSurgicalPreemption.testSurgicalPreemptionWithAvailableResource(TestCapacitySchedulerSurgicalPreemption.java:220)
> {noformat}



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