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From "Owen O'Malley (JIRA)" <j...@apache.org>
Subject [jira] Resolved: (HADOOP-484) Additional splilts for last reduces?
Date Tue, 29 Aug 2006 04:45:24 GMT
     [ http://issues.apache.org/jira/browse/HADOOP-484?page=all ]

Owen O'Malley resolved HADOOP-484.
----------------------------------

    Resolution: Duplicate

Splitting a reduce would be difficult and error-prone while it was in progress. The standard
approach for this problem is to use speculative execution to shorten the tail. It seems to
be very effective.

> Additional splilts for last reduces?
> ------------------------------------
>
>                 Key: HADOOP-484
>                 URL: http://issues.apache.org/jira/browse/HADOOP-484
>             Project: Hadoop
>          Issue Type: Improvement
>          Components: mapred
>            Reporter: arkady borkovsky
>
> Often last few reduces take very long.  
> Would it make sense, if hardware is available, to resplit their inputs into smaller chunks
and to run multiple task instead?

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