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https://issues.apache.org/jira/browse/MAPREDUCE-2931?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Forest Tan updated MAPREDUCE-2931:
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Description:
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.
was: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.
Fix Version/s: (was: 0.21.0)
0.20.205.0
> 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: Aaron Kimball
> Fix For: 0.20.205.0
>
>
> 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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