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From "Sandy Ryza (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-2176) CapacityScheduler loops over all running applications rather than actively requesting apps
Date Wed, 18 Jun 2014 16:48:24 GMT

    [ https://issues.apache.org/jira/browse/YARN-2176?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14035925#comment-14035925
] 

Sandy Ryza commented on YARN-2176:
----------------------------------

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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