Vinod Kumar Vavilapalli commented on YARN-3712:

What is the effect of today's way of doing it synchronously?

Interesting you mention time taking for cleaning docker containers. /cc 
[~ashahab], [~sidharta-s] who are looking into that area.

> ContainersLauncher: handle event CLEANUP_CONTAINER asynchronously
> -----------------------------------------------------------------
>                 Key: YARN-3712
>                 URL: https://issues.apache.org/jira/browse/YARN-3712
>             Project: Hadoop YARN
>          Issue Type: Improvement
>          Components: nodemanager
>            Reporter: Jun Gong
>            Assignee: Jun Gong
>         Attachments: YARN-3712.01.patch, YARN-3712.02.patch
> It will save some time by handling event CLEANUP_CONTAINER asynchronously. 
> This improvement will be useful for cases that cleaning up container cost a 
> little long time(e.g. for our case: we are running Docker container on NM, it 
> will take above 1 seconds to clean up one docker container.  ) and many 
> containers to clean up(e.g. NM need clean up all running containers when NM 
> shutdown). 

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