Naganarasimha G R reassigned YARN-3260:

    Assignee: Naganarasimha G R

> NPE if AM attempts to register before RM processes launch event
> ---------------------------------------------------------------
>                 Key: YARN-3260
>                 URL: https://issues.apache.org/jira/browse/YARN-3260
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: resourcemanager
>    Affects Versions: 2.6.0
>            Reporter: Jason Lowe
>            Assignee: Naganarasimha G R
> The RM on one of our clusters was running behind on processing 
> AsyncDispatcher events, and this caused AMs to fail to register due to an 
> NPE.  The AM was launched and attempting to register before the 
> RMAppAttemptImpl had processed the LAUNCHED event, and the client to AM token 
> had not been generated yet.  The NPE occurred because the 
> ApplicationMasterService tried to encode the missing token.

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