Devaraj K updated YARN-3826:
    Attachment: YARN-3826.03.patch

Thanks [~chengbing.liu] for the patch.

There are lines exceeding max line width(>80 characters), I am attaching the 
same patch with max line width fix. 

> Race condition in ResourceTrackerService: potential wrong diagnostics messages
> ------------------------------------------------------------------------------
>                 Key: YARN-3826
>                 URL: https://issues.apache.org/jira/browse/YARN-3826
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: resourcemanager
>    Affects Versions: 2.7.0
>            Reporter: Chengbing Liu
>            Assignee: Chengbing Liu
>         Attachments: YARN-3826.01.patch, YARN-3826.02.patch, 
> YARN-3826.03.patch
> Since we are calling {{setDiagnosticsMessage}} in {{nodeHeartbeat}}, which 
> can be called concurrently, the static {{resync}} and {{shutdown}} may have 
> wrong diagnostics messages in some cases.
> On the other side, these static members can hardly save any memory, since the 
> normal heartbeat responses are created for each heartbeat.

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