Jian He updated YARN-3999:
    Summary: RM hangs on draing events  (was: Add a timeout when drain the 

> RM hangs on draing events
> -------------------------
>                 Key: YARN-3999
>                 URL: https://issues.apache.org/jira/browse/YARN-3999
>             Project: Hadoop YARN
>          Issue Type: Bug
>            Reporter: Jian He
>            Assignee: Jian He
>         Attachments: YARN-3999.1.patch, YARN-3999.2.patch, YARN-3999.2.patch, 
> YARN-3999.3.patch, YARN-3999.patch, YARN-3999.patch
> If external systems like ATS, or ZK becomes very slow, draining all the 
> events take a lot of time. If this time becomes larger than 10 mins, all 
> applications will expire. We can add a timeout and stop the dispatcher even 
> if not all events are drained.

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