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https://issues.apache.org/jira/browse/MAPREDUCE-4511?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13435901#comment-13435901
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Ahmed Radwan commented on MAPREDUCE-4511:
-----------------------------------------
For branch-1&2 last iterations, I have seen 7-10% improvement on terasort and
other custom example jobs. The actual % improvement may differ based on the
jobs and how heavy their reduce-side is. I have also used the default readahead
length in my tests, tuning this parameter for different setups can also have an
impact.
> Add IFile readahead
> -------------------
>
> Key: MAPREDUCE-4511
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-4511
> Project: Hadoop Map/Reduce
> Issue Type: Improvement
> Components: mrv1, mrv2, performance
> Reporter: Ahmed Radwan
> Assignee: Ahmed Radwan
> Fix For: 1.2.0, 2.2.0-alpha
>
> Attachments: MAPREDUCE-4511_branch1.patch,
> MAPREDUCE-4511_branch-1_rev2.patch, MAPREDUCE-4511_branch-1_rev3.patch,
> MAPREDUCE-4511_branch-1_rev4.patch, MAPREDUCE-4511_branch-1_rev5.patch,
> MAPREDUCE-4511_branch-1_rev6.patch, MAPREDUCE-4511_branch-1_rev7.patch,
> MAPREDUCE-4511_trunk.patch, MAPREDUCE-4511_trunk_rev2.patch,
> MAPREDUCE-4511_trunk_rev3.patch, MAPREDUCE-4511_trunk_rev4.patch,
> MAPREDUCE-4511_trunk_rev5.patch, MAPREDUCE-4511_trunk_rev6.patch
>
>
> This ticket is to add IFile readahead as part of HADOOP-7714.
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