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https://issues.apache.org/jira/browse/MAPREDUCE-5542?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14169028#comment-14169028
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Rohith commented on MAPREDUCE-5542:
-----------------------------------

I  updated the patch. Please review..

Approach I followed is whenever job status is null check the job status only in 
RM for finished or not.If finished/killed/failed, and return silently. I 
consider the scenario where if application state is not finished/killed/failed 
, then stil potentially throw NPE from patch. CMIAW, but here I do not think 
the scenario where JobStatus is null and application is still running!!??



> Killing a job just as it finishes can generate an NPE in client
> ---------------------------------------------------------------
>
>                 Key: MAPREDUCE-5542
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-5542
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: client, mrv2
>    Affects Versions: 2.1.0-beta, 0.23.9
>            Reporter: Jason Lowe
>            Assignee: Rohith
>         Attachments: MAPREDUCE-5542.1.patch, MAPREDUCE-5542.2.patch, 
> MAPREDUCE-5542.3.patch
>
>
> If a client tries to kill a job just as the job is finishing then the client 
> can crash with an NPE.



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