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https://issues.apache.org/jira/browse/YARN-3916?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14623590#comment-14623590
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Varun Saxena commented on YARN-3916:
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Pre YARN-3878 code would have actually worked for DrainDispatcher.
> DrainDispatcher#await should wait till event has been completely handled
> ------------------------------------------------------------------------
>
> Key: YARN-3916
> URL: https://issues.apache.org/jira/browse/YARN-3916
> Project: Hadoop YARN
> Issue Type: Bug
> Components: resourcemanager
> Affects Versions: 2.7.0
> Reporter: Varun Saxena
> Assignee: Varun Saxena
> Priority: Critical
>
> DrainDispatcher#await should wait till event has been completely handled.
> Currently it only checks for whether event queue has become empty.
> And in many tests we directly check for a state to be changed after calling
> await.
> Sometimes, the states do not change by the time we check them as event has
> not been completely handled.
> This is causing test failures such as YARN-3909 and YARN-3910 and may cause
> other test failures as well.
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