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https://issues.apache.org/jira/browse/YARN-3712?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14560679#comment-14560679
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Jun Gong commented on YARN-3712:
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[~vinodkv]
Our case: NM receives a event SHUTDOWN, and starts to clean up containers. If
doing it synchronously and cleaning up takes a little long time, some
containers might not be killed && cleaned up, then corresponding launching
container process "ContainersLauncher #.." will not exit until container
finishes. It will result problem likes YARN-3585, NM hang.
> 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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