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From "Sandy Ryza (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-1367) LocalJobRunner should support parallel mapper execution
Date Mon, 08 Oct 2012 22:22:03 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-1367?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13471916#comment-13471916
] 

Sandy Ryza commented on MAPREDUCE-1367:
---------------------------------------

I submitted a patch for branch-1, as it was never backported.
                
> 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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