Rohith commented on YARN-2917:

bq. how about creating a new thread and call sys exit ?
This also good. I see many places System.exit are called in RM/NM or other 
daemons. There can be centralized single thread that does system.exit. Any 

> Potential deadlock in AsyncDispatcher when system.exit called in 
> AsyncDispatcher#dispatch and AsyscDispatcher#serviceStop from shutdown hook
> --------------------------------------------------------------------------------------------------------------------------------------------
>                 Key: YARN-2917
>                 URL: https://issues.apache.org/jira/browse/YARN-2917
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: resourcemanager
>            Reporter: Rohith
>            Assignee: Rohith
>            Priority: Critical
>         Attachments: 0001-YARN-2917.patch
> I encoutered scenario where RM hanged while shutting down and keep on logging 
> {{2014-12-03 19:32:44,283 INFO org.apache.hadoop.yarn.event.AsyncDispatcher: 
> Waiting for AsyncDispatcher to drain.}}

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