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 

> 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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