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https://issues.apache.org/jira/browse/YARN-8051?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16596901#comment-16596901
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Eric Payne commented on YARN-8051:
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+1. Committing to branch-2, branch-2.9, and branch-2.8
> TestRMEmbeddedElector#testCallbackSynchronization is flakey
> -----------------------------------------------------------
>
> Key: YARN-8051
> URL: https://issues.apache.org/jira/browse/YARN-8051
> Project: Hadoop YARN
> Issue Type: Improvement
> Components: test
> Affects Versions: 2.10.0, 2.9.1, 2.8.4, 3.0.2, 3.2.0, 3.1.1
> Reporter: Robert Kanter
> Assignee: Robert Kanter
> Priority: Major
> Fix For: 3.2.0, 3.0.4, 3.1.2
>
> Attachments: YARN-8051-branch-2.002.patch, YARN-8051.001.patch,
> YARN-8051.002.patch
>
>
> We've seen some rare flakey failures in
> {{TestRMEmbeddedElector#testCallbackSynchronization}}:
> {noformat}
> org.mockito.exceptions.verification.WantedButNotInvoked:
> Wanted but not invoked:
> adminService.transitionToStandby(<any>);
> -> at
> org.apache.hadoop.yarn.server.resourcemanager.TestRMEmbeddedElector.testCallbackSynchronizationNeutral(TestRMEmbeddedElector.java:215)
> Actually, there were zero interactions with this mock.
> at
> org.apache.hadoop.yarn.server.resourcemanager.TestRMEmbeddedElector.testCallbackSynchronizationNeutral(TestRMEmbeddedElector.java:215)
> at
> org.apache.hadoop.yarn.server.resourcemanager.TestRMEmbeddedElector.testCallbackSynchronization(TestRMEmbeddedElector.java:146)
> at
> org.apache.hadoop.yarn.server.resourcemanager.TestRMEmbeddedElector.testCallbackSynchronization(TestRMEmbeddedElector.java:109)
> {noformat}
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