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From "Alejandro Abdelnur (JIRA)" <j...@apache.org>
Subject [jira] [Moved] (YARN-23) FairScheduler: PoolSchedulable#updateDemand() - potential redundant aggregation
Date Mon, 13 Aug 2012 23:45:37 GMT

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

Alejandro Abdelnur moved MAPREDUCE-4518 to YARN-23:
---------------------------------------------------

          Component/s:     (was: contrib/fair-share)
                       scheduler
    Affects Version/s:     (was: 1.0.3)
                       2.1.0-alpha
             Workflow: jira  (was: no-reopen-closed, patch-avail)
                  Key: YARN-23  (was: MAPREDUCE-4518)
              Project: Hadoop YARN  (was: Hadoop Map/Reduce)
    
> 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: MR-4518_branch1.patch, trunk-MR-4518.patch, trunk-MR-4518.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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