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https://issues.apache.org/jira/browse/YARN-357?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13572486#comment-13572486
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Daryn Sharp commented on YARN-357:
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Sid, thanks a lot for your help. I'll commit shortly.
> App submission should not be synchronized
> -----------------------------------------
>
> Key: YARN-357
> URL: https://issues.apache.org/jira/browse/YARN-357
> Project: Hadoop YARN
> Issue Type: Bug
> Components: resourcemanager
> Affects Versions: 0.23.3, 3.0.0, 2.0.0-alpha
> Reporter: Daryn Sharp
> Assignee: Daryn Sharp
> Attachments: YARN-357.patch, YARN-357.patch, YARN-357.txt
>
>
> MAPREDUCE-2953 fixed a race condition with querying of app status by making
> {{RMClientService#submitApplication}} synchronously invoke
> {{RMAppManager#submitApplication}}. However, the {{synchronized}} keyword was
> also added to {{RMAppManager#submitApplication}} with the comment:
> bq. I made the submitApplication synchronized to keep it consistent with the
> other routines in RMAppManager although I do not believe it needs it since
> the rmapp datastructure is already a concurrentMap and I don't see anything
> else that would be an issue.
> It's been observed that app submission latency is being unnecessarily
> impacted.
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