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https://issues.apache.org/jira/browse/YARN-3999?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14692729#comment-14692729
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Xuan Gong commented on YARN-3999:
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Thanks, Jian. Committed into trunk/branch-2/branch-2.7.
> RM hangs on draing events
> -------------------------
>
> Key: YARN-3999
> URL: https://issues.apache.org/jira/browse/YARN-3999
> Project: Hadoop YARN
> Issue Type: Bug
> Reporter: Jian He
> Assignee: Jian He
> Fix For: 2.7.2
>
> Attachments: YARN-3999-branch-2.7.patch, YARN-3999.1.patch,
> YARN-3999.2.patch, YARN-3999.2.patch, YARN-3999.3.patch, YARN-3999.4.patch,
> YARN-3999.5.patch, YARN-3999.patch, YARN-3999.patch
>
>
> If external systems like ATS, or ZK becomes very slow, draining all the
> events take a lot of time. If this time becomes larger than 10 mins, all
> applications will expire. Fixes include:
> 1. add a timeout and stop the dispatcher even if not all events are drained.
> 2. Move ATS service out from RM active service so that RM doesn't need to
> wait for ATS to flush the events when transitioning to standby.
> 3. Stop client-facing services (ClientRMService etc.) first so that clients
> get fast notification that RM is stopping/transitioning.
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