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https://issues.apache.org/jira/browse/YARN-3999?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jian He updated YARN-3999:
--------------------------
    Description: 
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. Fixes include:
1. add a timeout and stop the dispatcher even if not all events are drained.
2. Move ATS service out from RM active service so that RM doesn't need to wait 
for ATS to flush the events when transitioning to standby.
3. Stop client-facing services (ClientRMService etc.) first so that clients get 
fast notification that RM is stopping/transitioning.

  was: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.


> 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. Fixes include:
> 1. add a timeout and stop the dispatcher even if not all events are drained.
> 2. Move ATS service out from RM active service so that RM doesn't need to 
> wait for ATS to flush the events when transitioning to standby.
> 3. Stop client-facing services (ClientRMService etc.) first so that clients 
> get fast notification that RM is stopping/transitioning.



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