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https://issues.apache.org/jira/browse/MAPREDUCE-1367?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13547161#comment-13547161
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Sandy Ryza commented on MAPREDUCE-1367:
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TestLocalRunner passes
> LocalJobRunner should support parallel mapper execution
> -------------------------------------------------------
>
> Key: MAPREDUCE-1367
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-1367
> Project: Hadoop Map/Reduce
> Issue Type: Improvement
> Reporter: Aaron Kimball
> Assignee: Aaron Kimball
> Fix For: 0.21.0
>
> Attachments: MAPREDUCE-1367.2.patch, MAPREDUCE-1367.3.patch,
> MAPREDUCE-1367.4.patch, MAPREDUCE-1367.5.patch, MAPREDUCE-1367.6.patch,
> MAPREDUCE-1367.7.patch, MAPREDUCE-1367-branch1.patch, MAPREDUCE-1367.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.
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