Steve Loughran commented on YARN-2057:

you're right, the stack trace and scenario -"heartbeat during app launch" seems 
to match; closing as duplicate

> NPE in RM handling node update while app submission in progress
> ---------------------------------------------------------------
>                 Key: YARN-2057
>                 URL: https://issues.apache.org/jira/browse/YARN-2057
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: resourcemanager
>    Affects Versions: 2.4.0
>         Environment: OS/X, hadoop 2.4.0 mini yarn cluster, slider unit test 
> TestDestroyMasterlessAM
>            Reporter: Steve Loughran
> One of our test runs finished prematurely with an NPE in the RM, followed by 
> the RM thread calling system.exit(). It looks like an NM update came in while 
> the app was still being set up, causing confusion.

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