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From "Karthik Kambatla (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-4305) Implement delay scheduling in capacity scheduler for improving data locality
Date Mon, 06 May 2013 22:36:18 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-4305?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13650185#comment-13650185

Karthik Kambatla commented on MAPREDUCE-4305:

Thanks Mayank. +1 on the code part.

Sorry for missing these readability nits in my last review. Choose to ignore some/all of them.
# Should we call NumberBasedDelayScheduling to SkipsBasedDelayScheduling, makes it easier
to understand? (Might have to change other method names accordingly)
# Rename calcNumberBasedDelayScheduling to resetNumberBasedDelayScheduling
# Within calcNumberBasedDelayScheduling, use ternary operator instead of if-else

> Implement delay scheduling in capacity scheduler for improving data locality
> ----------------------------------------------------------------------------
>                 Key: MAPREDUCE-4305
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-4305
>             Project: Hadoop Map/Reduce
>          Issue Type: New Feature
>            Reporter: Mayank Bansal
>            Assignee: Mayank Bansal
>         Attachments: MAPREDUCE-4305, MAPREDUCE-4305-1.patch, PATCH-MAPREDUCE-4305-MR1-1.patch,
PATCH-MAPREDUCE-4305-MR1-2.patch, PATCH-MAPREDUCE-4305-MR1-3.patch, PATCH-MAPREDUCE-4305-MR1-6.patch,
> Capacity Scheduler data local tasks are about 40%-50% which is not good.
> While my test with 70 node cluster i consistently get data locality around 40-50% on
a free cluster.
> I think we need to implement something like delay scheduling in the capacity scheduler
for improving the data locality.
> http://radlab.cs.berkeley.edu/publication/308
> After implementing the delay scheduling on Hadoop 22 I am getting 100 % data locality
in free cluster and around 90% data locality in busy cluster.
> Thanks,
> Mayank

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