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https://issues.apache.org/jira/browse/YARN-7003?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16476438#comment-16476438
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Erik Krogen commented on YARN-7003:
-----------------------------------
Hey [~Tao Yang], are you planning to backport this to 2.9? This seems to be a
pretty severe issue & the DCS functionality is available in that branch.
> DRAINING state of queues is not recovered after RM restart
> ----------------------------------------------------------
>
> Key: YARN-7003
> URL: https://issues.apache.org/jira/browse/YARN-7003
> Project: Hadoop YARN
> Issue Type: Bug
> Components: capacityscheduler
> Affects Versions: 2.9.0, 3.0.0-alpha4
> Reporter: Tao Yang
> Assignee: Tao Yang
> Priority: Major
> Fix For: 3.2.0, 3.1.1, 3.0.3
>
> Attachments: YARN-7003.001.patch, YARN-7003.002.patch,
> YARN-7003.003.patch, YARN-7003.004.patch
>
>
> DRAINING state is a temporary state in RM memory, when queue state is set to
> be STOPPED but there are still some pending or active apps in it, the queue
> state will be changed to DRAINING instead of STOPPED after refreshing queues.
> We've encountered the problem that the state of this queue will aways be
> STOPPED after RM restarted, so that it can be removed at any time and leave
> some apps in a non-existing queue.
> To fix this problem, we could recover DRAINING state in the recovery process
> of pending/active apps. I will upload a patch with test case later for review.
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