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Date: Fri, 18 Dec 2009 03:26:18 +0000 (UTC)
From: "Aaron Kimball (JIRA)" <jira@apache.org>
To: mapreduce-issues@hadoop.apache.org
Subject: [jira] Updated: (MAPREDUCE-1059) distcp can generate uneven map
 task assignments
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     [ https://issues.apache.org/jira/browse/MAPREDUCE-1059?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Aaron Kimball updated MAPREDUCE-1059:
-------------------------------------

    Status: Patch Available  (was: Open)

> distcp can generate uneven map task assignments
> -----------------------------------------------
>
>                 Key: MAPREDUCE-1059
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-1059
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: distcp
>            Reporter: Aaron Kimball
>            Assignee: Aaron Kimball
>         Attachments: MAPREDUCE-1059.2.patch, MAPREDUCE-1059.3.patch, MAPREDUCE-1059.patch
>
>
> distcp writes out a SequenceFile containing the source files to transfer, and their sizes. Map tasks are created over spans of this file, representing files which each mapper should transfer. In practice, some transfer loads yield many empty map tasks and a few tasks perform the bulk of the work.

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