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From "Johan Gustavsson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-4066) Large number of queues choke fair scheduler
Date Mon, 28 Sep 2015 07:00:13 GMT

    [ https://issues.apache.org/jira/browse/YARN-4066?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14910113#comment-14910113
] 

Johan Gustavsson commented on YARN-4066:
----------------------------------------

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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