Wangda Tan commented on YARN-4000:

+1 to what [~jlowe]'s suggestion, we should kill app (if rm.fail-fast is false) 
or fail RM (if rm.fail-fast is true).

This is similar to https://issues.apache.org/jira/browse/YARN-3764, we need to 
consider LeafQueue's movement as well. 
Currently RM restart will be succeeded (haven't verified, just my guess) if we 
move a leaf queue from one parent to another during restart. We should fail 
app/rm in the case before we support removing queues.

> 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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