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https://issues.apache.org/jira/browse/YARN-2176?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14518781#comment-14518781
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Xianyin Xin commented on YARN-2176:
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Sorry [~jlowe], i've made a mistake. What i thought was Fair, where we resort
all the apps when we make scheduling. When the number of the running apps is
thousands, the time consume for resorting is hundreds of milliseconds. You're
right that the overhead in CS is low.
> 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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