Sunil G commented on YARN-4000:

Agreeing for killing apps when fail-fast is false. Also as [~jlowe] mentioned, 
if we can introduce a pause state as App will be terminated from RM within 
certain timeline, such notification can give ample amount of time for 
user/admin to correct the config if needed. If no measures are taken, apps will 
be killed after the timeline. Somthing similar to Node DECOMMISIONING. 

> 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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