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https://issues.apache.org/jira/browse/YARN-3487?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14498324#comment-14498324
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Sunil G commented on YARN-3487:
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Hi [~leftnoteasy] and [~jlowe]
During reloading CS config, if a queue s removed, eventhough 'queues' is a
concurrent one, operation for delete may be in progress. And here we may try
for checkAccess and pass it with success.
> CapacityScheduler scheduler lock obtained unnecessarily
> -------------------------------------------------------
>
> Key: YARN-3487
> URL: https://issues.apache.org/jira/browse/YARN-3487
> Project: Hadoop YARN
> Issue Type: Bug
> Components: capacityscheduler
> Affects Versions: 2.6.0
> Reporter: Jason Lowe
> Assignee: Jason Lowe
> Priority: Critical
> Attachments: YARN-3487.001.patch, YARN-3487.002.patch
>
>
> Recently saw a significant slowdown of applications on a large cluster, and
> we noticed there were a large number of blocked threads on the RM. Most of
> the blocked threads were waiting for the CapacityScheduler lock while calling
> getQueueInfo.
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