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Posted to mapreduce-issues@hadoop.apache.org by "Vitaly Kruglikov (JIRA)" <ji...@apache.org> on 2013/03/13 06:54:12 UTC
[jira] [Commented] (MAPREDUCE-4468) Encapsulate FairScheduler
preemption logic into helper class
[ 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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