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https://issues.apache.org/jira/browse/MAPREDUCE-3186?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13132982#comment-13132982
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Robert Joseph Evans commented on MAPREDUCE-3186:
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Yes RM-restart is not that common, but when it does I don't want to have to ssh 
to every one of our 4000 nodes in a cluster and try to kill off all of the 
running AppMasters.  Even with scripts that can be painful.  

What about other containers?  Are they also not killed off when the NM exits?
                
> User jobs are getting hanged if the Resource manager process goes down and 
> comes up while job is getting executed.
> ------------------------------------------------------------------------------------------------------------------
>
>                 Key: MAPREDUCE-3186
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-3186
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: mrv2
>    Affects Versions: 0.23.0
>         Environment: linux
>            Reporter: Ramgopal N
>            Assignee: Eric Payne
>              Labels: test
>
> If the resource manager is restarted while the job execution is in progress, 
> the job is getting hanged.
> UI shows the job as running.
> In the RM log, it is throwing an error "ERROR 
> org.apache.hadoop.yarn.server.resourcemanager.ApplicationMasterService: 
> AppAttemptId doesnt exist in cache appattempt_1318579738195_0004_000001"
> In the console MRAppMaster and Runjar processes are not getting killed

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