[jira] [Updated] (YARN-10672) All testcases in TestReservations are flaky

["Szilard Nemeth (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/YARN-10672?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Szilard Nemeth updated YARN-10672:
----------------------------------
    Attachment: YARN-10672-debuglogs.patch
                Screenshot 2021-03-04 at 21.34.18.png

> All testcases in TestReservations are flaky
> -------------------------------------------
>
>                 Key: YARN-10672
>                 URL: https://issues.apache.org/jira/browse/YARN-10672
>             Project: Hadoop YARN
>          Issue Type: Bug
>            Reporter: Szilard Nemeth
>            Assignee: Szilard Nemeth
>            Priority: Major
>         Attachments: Screenshot 2021-03-04 at 21.34.18.png, YARN-10672-debuglogs.patch
>
>
> Running a particular test in TestReservations 100 times never passes all the time.
> For example, let's run testReservationNoContinueLook 100 times. For me, it produced 39 failed and 61 passed results.
> Screenshot is attached.
> Stacktrace: 
> {code}
> java.lang.AssertionError: 
> Expected :2048
> Actual   :0
> <Click to see difference>
> at org.junit.Assert.fail(Assert.java:89)
> at org.junit.Assert.failNotEquals(Assert.java:835)
> at org.junit.Assert.assertEquals(Assert.java:647)
> at org.junit.Assert.assertEquals(Assert.java:633)
> at org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.TestReservations.testReservationNoContinueLook(TestReservations.java:642)
> {code}
> The test fails here: 
> {code}
>  // Start testing...
> // Only AM
> TestUtils.applyResourceCommitRequest(clusterResource,
>     a.assignContainers(clusterResource, node_0,
>         new ResourceLimits(clusterResource),
>         SchedulingMode.RESPECT_PARTITION_EXCLUSIVITY), nodes, apps);
> assertEquals(2 * GB, a.getUsedResources().getMemorySize());
> {code}
> With some debugging (patch attached), I realized that sometimes there are no registered nodes so the AM can't be allocated.



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