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https://issues.apache.org/jira/browse/MAPREDUCE-4511?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13435568#comment-13435568
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Alejandro Abdelnur commented on MAPREDUCE-4511:
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+1 for patch for trunk, pending jenkins.
I don't think patch for branch-1 is correct, you should not add those constants
to the {{JobConf}} as they won't be in trunk/branch-2 thus breaking backwards
compatibility. They should be somewhere else, just not in the {{JobConf}}.
> Add IFile readahead
> -------------------
>
> Key: MAPREDUCE-4511
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-4511
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: mrv1, mrv2, performance
> Reporter: Ahmed Radwan
> Assignee: Ahmed Radwan
> 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_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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