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https://issues.apache.org/jira/browse/YARN-4066?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14910113#comment-14910113
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Johan Gustavsson commented on YARN-4066:
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Thanks for re-running this. Looking at the tests in place I see no need to
introduce new tests for this patch, also this patch doesn't break the tests in
place.
> Large number of queues choke fair scheduler
> -------------------------------------------
>
> Key: YARN-4066
> URL: https://issues.apache.org/jira/browse/YARN-4066
> Project: Hadoop YARN
> Issue Type: Bug
> Components: fairscheduler
> Affects Versions: 2.7.1
> Reporter: Johan Gustavsson
> Assignee: Johan Gustavsson
> Attachments: YARN-4066-2.patch, YARN-4066-3.patch, yarn-4066-1.patch
>
>
> Due to synchronization and all the loops performed during queue creation,
> setting a large amount of queues (12000+) will completely choke the
> scheduler. To deal with this some optimization to
> "QueueManager.updateAllocationConfiguration(AllocationConfiguration
> queueConf)" should be done to reduce the amount of unnesecary loops. The
> attached patch have been tested to work with atleast 96000 queues.
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