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Date: Mon, 29 Nov 2010 20:17:13 -0500 (EST)
From: "Ramkumar Vadali (JIRA)" <jira@apache.org>
To: mapreduce-issues@hadoop.apache.org
Subject: [jira] Commented: (MAPREDUCE-1367) LocalJobRunner should support
 parallel mapper execution
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    [ https://issues.apache.org/jira/browse/MAPREDUCE-1367?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12965054#action_12965054 ] 

Ramkumar Vadali commented on MAPREDUCE-1367:
--------------------------------------------

@Aaron, Just curious, is this being used in production? If so, could you please outline the use case?

> 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.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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