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From "Aaron Kimball (JIRA)" <j...@apache.org>
Subject [jira] Updated: (MAPREDUCE-1059) distcp can generate uneven map task assignments
Date Thu, 22 Oct 2009 04:26:59 GMT

     [ https://issues.apache.org/jira/browse/MAPREDUCE-1059?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

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

    Status: Open  (was: Patch Available)

> 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.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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