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https://issues.apache.org/jira/browse/YARN-4000?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14956963#comment-14956963
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Varun Saxena commented on YARN-4000:
------------------------------------

[~jianhe],
Discussed offline with Rohith. Diagnostic information is needed by him for 
another JIRA he is working on.. So if YARN-4000 is good enough to go in, I 
guess I can simply rebase this patch and let it go in. And we can close 
YARN-4111 as duplicate.

> 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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