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https://issues.apache.org/jira/browse/YARN-10672?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Szilard Nemeth updated YARN-10672:
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Attachment: Screenshot 2021-03-04 at 21.28.18.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: 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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