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https://issues.apache.org/jira/browse/YARN-8679?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16584322#comment-16584322
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Wangda Tan commented on YARN-8679:
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[~rohithsharma], thanks for the patch.
I'm a bit worried about the internal HashSet could be operated at the same time
which could cause ConcurrentModificationException. I keep operations of the
maps to be protected, only moved operations of TS out of the synchronized lock.
See (02) patch.
> [ATSv2] If HBase cluster is down for long time, high chances that NM
> ContainerManager dispatcher get blocked
> ------------------------------------------------------------------------------------------------------------
>
> Key: YARN-8679
> URL: https://issues.apache.org/jira/browse/YARN-8679
> Project: Hadoop YARN
> Issue Type: Bug
> Reporter: Rohith Sharma K S
> Assignee: Rohith Sharma K S
> Priority: Major
> Attachments: YARN-8679.01.patch, YARN-8679.02.patch
>
>
> It is observed that if ATSv2 back end is down and client wait for few
> minutes, then NM ContainerManager dispatcher thread is blocked. As a result,
> NM containers operations are stuck in event processing.
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