Rohith Sharma K S commented on YARN-4000:

[~varun_saxena] I see many changes related to diagnosis messages are 
incorporated in this patch. YARN-4111 is inteded JIRA for adding diagnosis 
message for kill transition. If required, YARN-4111 can be generalized to do 
the changes which is done as part of current patch. 
Would you mind providing patch related to  diagnosis message change at 
YARN-4111? As first, let YARN-4111 go in first. 

> 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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