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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-2931) CLONE - LocalJobRunner should support parallel mapper execution
Date Wed, 09 Jan 2013 19:32:13 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-2931?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13548871#comment-13548871
] 

Hadoop QA commented on MAPREDUCE-2931:
--------------------------------------

{color:red}-1 overall{color}.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12564000/MAPREDUCE-1367-branch1.patch
  against trunk revision .

    {color:red}-1 patch{color}.  The patch command could not apply the patch.

Console output: https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/3219//console

This message is automatically generated.
                
> 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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