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From "Matt Foley (Updated) (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (MAPREDUCE-2931) CLONE - LocalJobRunner should support parallel mapper execution
Date Wed, 19 Oct 2011 07:43:11 GMT

     [ https://issues.apache.org/jira/browse/MAPREDUCE-2931?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Matt Foley updated MAPREDUCE-2931:
----------------------------------

    Target Version/s: 0.20.206.0
       Fix Version/s:     (was: 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
>
> 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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