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From "Vitaly Kruglikov (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-4468) Encapsulate FairScheduler preemption logic into helper class
Date Wed, 13 Mar 2013 05:54:12 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-4468?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13600858#comment-13600858

Vitaly Kruglikov commented on MAPREDUCE-4468:

The file FairScheduler.apt.vm doesn't specify the units for the "minResources" property in
queue allocations. Is it in megabytes or in bytes?
> 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: 2.0.5-beta
>         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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