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https://issues.apache.org/jira/browse/YARN-4000?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14901272#comment-14901272
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Varun Saxena commented on YARN-4000:
------------------------------------

[~jianhe], I think this shouldn't be a problem. In recoverContainersOnNode, we 
check if application is present in the scheduler or not, which will not be 
there.
If this is so, we consider them as orphan containers and in the next HB from 
NM, report these containers as the ones to be cleaned up by NM.
NM then cleans them up(kills them) if they are running.
Correct me if I am wrong.

> RM crashes with NPE if leaf queue becomes parent queue during restart
> ---------------------------------------------------------------------
>
>                 Key: YARN-4000
>                 URL: https://issues.apache.org/jira/browse/YARN-4000
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: capacityscheduler, resourcemanager
>    Affects Versions: 2.6.0
>            Reporter: Jason Lowe
>            Assignee: Varun Saxena
>         Attachments: YARN-4000.01.patch, YARN-4000.02.patch, 
> YARN-4000.03.patch, YARN-4000.04.patch, YARN-4000.05.patch
>
>
> This is a similar situation to YARN-2308.  If an application is active in 
> queue A and then the RM restarts with a changed capacity scheduler 
> configuration where queue A becomes a parent queue to other subqueues then 
> the RM will crash with a NullPointerException.



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