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https://issues.apache.org/jira/browse/YARN-4066?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14935341#comment-14935341
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Hudson commented on YARN-4066:
------------------------------
FAILURE: Integrated in Hadoop-trunk-Commit #8540 (See
[https://builds.apache.org/job/Hadoop-trunk-Commit/8540/])
YARN-4066. Large number of queues choke fair scheduler. (Johan Gustavsson via
kasha) (kasha: rev a0b5a0a419dfc07b7ac45c06b11b4c8dc7e79958)
*
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/scheduler/fair/QueueManager.java
* hadoop-yarn-project/CHANGES.txt
> 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
> Fix For: 2.8.0
>
> 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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