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https://issues.apache.org/jira/browse/YARN-5436?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15396054#comment-15396054
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Zhiyuan Yang commented on YARN-5436:
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Data race can cause RM stop without handling last enqueued event.
> Race in AsyncDispatcher can cause random test failures in Tez(probably YARN
> also )
> ----------------------------------------------------------------------------------
>
> Key: YARN-5436
> URL: https://issues.apache.org/jira/browse/YARN-5436
> Project: Hadoop YARN
> Issue Type: Bug
> Reporter: Zhiyuan Yang
> Assignee: Zhiyuan Yang
>
> In YARN-2264, a race in DrainDispatcher was fixed. Unfortunately, it also
> exists in AsyncDispatcher but wasn't found. In YARN-2991, another
> DrainDispatcher bug was fixed by letting DrainDispatcher extend
> AsyncDispatcher because AsyncDispatcher doesn't have such issue. However,
> this shadows YARN-2264, and now similar race reappears in Tez unit tests
> (probably also YARN unit tests also).
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