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https://issues.apache.org/jira/browse/MAPREDUCE-4305?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13643162#comment-13643162
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Karthik Kambatla commented on MAPREDUCE-4305:
---------------------------------------------
Thanks Mayank. From a logic point of view, the code looks good.
Have a few nits, mostly formatting:
# The patch has a few unrelated diffs - mostly whitespace and formatting
changes[
# Definition of {{SKIP_SCHEDULING_TIMES}} seems way over 80 chars - can we wrap
it around?
# Formatting seems off at
{code}long numActiveNodesinCluster = scheduler.taskTrackerManager
.getClusterStatus().getTaskTrackers()
- scheduler.taskTrackerManager.getClusterStatus()
.getGraylistedTrackers();
{code}
# Switch statement in {{getAllowedLocalityLevel()}} has a few statements over
80 chars
# LocalityStage javadoc refers to FairScheduler
# In TestCapacityScheduler, formatting in method parameters of
{{obtain*MapTask}}: no space after comma
> 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.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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