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From "Karthik Kambatla (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (YARN-23) FairScheduler: PoolSchedulable#updateDemand() - potential redundant aggregation
Date Tue, 14 Aug 2012 18:43:38 GMT

     [ https://issues.apache.org/jira/browse/YARN-23?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Karthik Kambatla updated YARN-23:
---------------------------------

    Attachment:     (was: MR-4518_branch1.patch)
    
> FairScheduler: PoolSchedulable#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: 2.1.0-alpha
>            Reporter: Karthik Kambatla
>            Assignee: Karthik Kambatla
>         Attachments: trunk-MR-4518.patch, trunk-MR-4518.patch, YARN-23.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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