Varun Saxena commented on YARN-4000:

bq. is this if condition a typo ?
Yes. Had updated wrong patch. Realised this after QA report. Had updated patch 

bq. the idea is to send the diagnostics from app to attempt and let attempt 
send it back.
Ok, let do it this way.

bq. random sleep may be flicky, use MockRM#waitForState(ApplicationId appId, 
RMAppState finalState) instead
Ok. Will use.. 

> 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
> 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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