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https://issues.apache.org/jira/browse/YARN-4000?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14662861#comment-14662861
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Varun Saxena commented on YARN-4000:
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[~jlowe] / [~leftnoteasy], your thoughts on this ?
Not let RM start in this case or just fail the app ?
I think latter because configuration like this(adding leaf queues to an
existing queue) is a valid and supported configuration in CS.
> 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
>
> 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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