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From "Aaron Kimball (JIRA)" <j...@apache.org>
Subject [jira] Commented: (MAPREDUCE-1367) LocalJobRunner should support parallel mapper execution
Date Wed, 27 Jan 2010 07:02:54 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-1367?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12805390#action_12805390
] 

Aaron Kimball commented on MAPREDUCE-1367:
------------------------------------------

Test failures are all unrelated (TT blacklisting has now falied two tests in a row?)

> 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
>         Attachments: MAPREDUCE-1367.2.patch, MAPREDUCE-1367.3.patch, MAPREDUCE-1367.4.patch,
MAPREDUCE-1367.5.patch, MAPREDUCE-1367.6.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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