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From "Alejandro Abdelnur (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-4518) FairScheduler: PoolSchedulable#updateDemand() - potential redundant aggregation
Date Tue, 07 Aug 2012 05:21:03 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-4518?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13429939#comment-13429939
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Alejandro Abdelnur commented on MAPREDUCE-4518:
-----------------------------------------------

+1. does this apply to trunk as well? if so we need a patch for it first.
                
> FairScheduler: PoolSchedulable#updateDemand() - potential redundant aggregation
> -------------------------------------------------------------------------------
>
>                 Key: MAPREDUCE-4518
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-4518
>             Project: Hadoop Map/Reduce
>          Issue Type: Improvement
>          Components: contrib/fair-share
>    Affects Versions: 1.0.3
>            Reporter: Karthik Kambatla
>            Assignee: Karthik Kambatla
>         Attachments: MR-4518_branch1.patch
>
>
> In FS, PoolSchedulable#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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