Haibo Chen updated MAPREDUCE-6771:
    Attachment: mapreduce6771.002.patch

Sorry for the long delay. Uploading a new patch that adds a unit test.

> RMContainerAllocator sends container diagnostics event after corresponding 
> completion event
> -------------------------------------------------------------------------------------------
>                 Key: MAPREDUCE-6771
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-6771
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: mrv2
>    Affects Versions: 2.7.3
>            Reporter: Haibo Chen
>            Assignee: Haibo Chen
>         Attachments: TaUnsuccessfullyEventEmission.jpg, 
> mapreduce6771.001.patch, mapreduce6771.002.patch
> Task containers can go over their resource limit, and killed by Node Manager. 
> Then MR AM gets notified of the container status and diagnostics information 
> through its heartbeat with RM.  However, it is possible that the diagnostics 
> information never gets into .jhist file, so when the job completes, the 
> diagnostics information associated with the failed task attempts is empty.  
> This makes it hard for users to root cause job failures that are often caused 
> by memory leak.

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