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https://issues.apache.org/jira/browse/MAPREDUCE-3641?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13187226#comment-13187226
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Vinod Kumar Vavilapalli commented on MAPREDUCE-3641:
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+1. This looks good.
I also have an offline confirmation from [~sseth] that this runs fine on a 350
node cluster and improves performance for a few benchmarks.
May be good to fix FifoScheduler also to have this, but we can keep that
separate.
I am going to push this in.
> CapacityScheduler should be more conservative assigning off-switch requests
> ---------------------------------------------------------------------------
>
> Key: MAPREDUCE-3641
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-3641
> Project: Hadoop Map/Reduce
> Issue Type: Sub-task
> Components: mrv2, scheduler
> Affects Versions: 0.23.0
> Reporter: Arun C Murthy
> Assignee: Arun C Murthy
> Priority: Blocker
> Attachments: MAPREDUCE-3641.patch, MAPREDUCE-3641.patch,
> MAPREDUCE-3641.patch, MAPREDUCE-3641.patch
>
>
> In hadoop-1, the CS is very conservative handing out off-switch assignments,
> we need to do the same in YARN.
> We noticed performance regressions due to this, particularly for reduces.
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