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From "Chris Douglas (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HADOOP-3350) distcp should permit users to limit the number of maps
Date Tue, 06 May 2008 02:59:55 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-3350?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Chris Douglas updated HADOOP-3350:
----------------------------------

    Attachment: 3350-0.patch

This retains the existing behavior by default, but observes a "distcp.max.map.tasks" parameter.

> distcp should permit users to limit the number of maps
> ------------------------------------------------------
>
>                 Key: HADOOP-3350
>                 URL: https://issues.apache.org/jira/browse/HADOOP-3350
>             Project: Hadoop Core
>          Issue Type: Improvement
>            Reporter: Chris Douglas
>             Fix For: 0.18.0
>
>         Attachments: 3350-0.patch
>
>
> distcp provides no user-configurable setting to affect the number of maps run during
a copy. For large clusters, the current calculation- min(#bytes / 256MB, #nodes * 20)- can
be overly aggressive.

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