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https://issues.apache.org/jira/browse/YARN-4066?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14935834#comment-14935834
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Hudson commented on YARN-4066:
------------------------------

FAILURE: Integrated in Hadoop-Hdfs-trunk #2375 (See 
[https://builds.apache.org/job/Hadoop-Hdfs-trunk/2375/])
YARN-4066. Large number of queues choke fair scheduler. (Johan Gustavsson via 
kasha) (kasha: rev a0b5a0a419dfc07b7ac45c06b11b4c8dc7e79958)
* hadoop-yarn-project/CHANGES.txt
* 
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


> 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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