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https://issues.apache.org/jira/browse/YARN-2176?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14035925#comment-14035925
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Sandy Ryza commented on YARN-2176:
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Ah, good point, you're right.  In that case what do you think about an 
ActivationCallback with onActiveChanged(boolean active) that the leaf queue can 
register with the AppSchedulingInfo for?

> CapacityScheduler loops over all running applications rather than actively 
> requesting apps
> ------------------------------------------------------------------------------------------
>
>                 Key: YARN-2176
>                 URL: https://issues.apache.org/jira/browse/YARN-2176
>             Project: Hadoop YARN
>          Issue Type: Improvement
>          Components: capacityscheduler
>    Affects Versions: 2.4.0
>            Reporter: Jason Lowe
>
> The capacity scheduler performance is primarily dominated by 
> LeafQueue.assignContainers, and that currently loops over all applications 
> that are running in the queue.  It would be more efficient if we looped over 
> just the applications that are actively asking for resources rather than all 
> applications, as there could be thousands of applications running but only a 
> few hundred that are currently asking for resources.



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