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From "Alejandro Abdelnur (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-23) FairScheduler: FSQueueSchedulable#updateDemand() - potential redundant aggregation
Date Thu, 04 Oct 2012 22:41:47 GMT

    [ https://issues.apache.org/jira/browse/YARN-23?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13469792#comment-13469792
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Alejandro Abdelnur commented on YARN-23:
----------------------------------------

+1 pending test-patch report (just kicked it)
                
> FairScheduler: FSQueueSchedulable#updateDemand() - potential redundant aggregation
> ----------------------------------------------------------------------------------
>
>                 Key: YARN-23
>                 URL: https://issues.apache.org/jira/browse/YARN-23
>             Project: Hadoop YARN
>          Issue Type: Improvement
>          Components: scheduler
>    Affects Versions: 2.0.0-alpha
>            Reporter: Karthik Kambatla
>            Assignee: Karthik Kambatla
>         Attachments: trunk-MR-4518.patch, trunk-MR-4518.patch, YARN-23.patch, YARN-23.patch
>
>
> In FS, FSQueueSchedulable#updateDemand() limits the demand to maxTasks only after iterating
though all the pools and computing the final demand. 
> By checking if the demand has reached maxTasks in every iteration, we can avoid redundant
work, at the expense of one condition check every iteration.

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