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Date: Thu, 11 Oct 2012 17:35:16 +0000 (UTC)
From: "Arun C Murthy (JIRA)" <jira@apache.org>
To: mapreduce-issues@hadoop.apache.org
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Subject: [jira] [Updated] (MAPREDUCE-4468) Encapsulate FairScheduler
 preemption logic into helper class
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     [ https://issues.apache.org/jira/browse/MAPREDUCE-4468?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Arun C Murthy updated MAPREDUCE-4468:
-------------------------------------

    Fix Version/s:     (was: 2.0.2-alpha)
                   2.0.3-alpha
    
> Encapsulate FairScheduler preemption logic into helper class
> ------------------------------------------------------------
>
>                 Key: MAPREDUCE-4468
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-4468
>             Project: Hadoop Map/Reduce
>          Issue Type: Improvement
>          Components: scheduler
>            Reporter: Ryan Hennig
>            Priority: Minor
>              Labels: refactoring, scheduler
>             Fix For: 2.0.3-alpha
>
>         Attachments: MAPREDUCE-4468.patch
>
>   Original Estimate: 4h
>  Remaining Estimate: 4h
>
> I've extracted the preemption logic from the Fair Scheduler into a helper class so that FairScheduler is closer to following the Single Responsibility Principle.  This may eventually evolve into a generalized preemption module which could be leveraged by other schedulers.

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