Jun Gong created YARN-3712:
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             Summary: 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


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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