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Posted to mapreduce-issues@hadoop.apache.org by "Aaron Kimball (JIRA)" <ji...@apache.org> on 2009/10/06 01:47:31 UTC

[jira] Updated: (MAPREDUCE-1059) distcp can generate uneven map task assignments

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

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

    Attachment: MAPREDUCE-1059.patch

> 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.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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