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https://issues.apache.org/jira/browse/MAPREDUCE-2931?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13639288#comment-13639288
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Arun C Murthy commented on MAPREDUCE-2931:
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[~sandyr] / [~tomwhite] - Looks like Hive is badly broken on branch-1 due to
this (see MAPREDUCE-5166), should we revert this now and re-commit after the
fix? Thanks.
> CLONE - LocalJobRunner should support parallel mapper execution
> ---------------------------------------------------------------
>
> Key: MAPREDUCE-2931
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-2931
> Project: Hadoop Map/Reduce
> Issue Type: Improvement
> Reporter: Forest Tan
> Assignee: Sandy Ryza
> Attachments: MAPREDUCE-1367-branch1.patch
>
>
> The LocalJobRunner currently supports only a single execution thread. Given
> the prevalence of multi-core CPUs, it makes sense to allow users to run
> multiple tasks in parallel for improved performance on small (local-only)
> jobs.
> It is necessary to patch back MAPREDUCE-1367 into Hadoop 0.20.X version.
> Also, MapReduce-434 should be submitted together.
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