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From "Xianyin Xin (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-2176) CapacityScheduler loops over all running applications rather than actively requesting apps
Date Tue, 28 Apr 2015 10:59:07 GMT

    [ https://issues.apache.org/jira/browse/YARN-2176?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14516808#comment-14516808
] 

Xianyin Xin commented on YARN-2176:
-----------------------------------

Hi [~jlowe] and [~leftnoteasy], in YARN-3361, all running apps are still participating sorting
which may be time-consuming when there're thousands of apps. Is it necessary to make any optimization
for this?

> 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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