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From "Owen O'Malley (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-76) Implement speculative re-execution of reduces
Date Wed, 01 Nov 2006 05:43:41 GMT
    [ http://issues.apache.org/jira/browse/HADOOP-76?page=comments#action_12446162 ] 
            
Owen O'Malley commented on HADOOP-76:
-------------------------------------

Since the dfs locking doesn't really work reliably, I would drop the tip id part of the directory
structure, don't do any locking, and if the file is already in place, just skip that file.

> Implement speculative re-execution of reduces
> ---------------------------------------------
>
>                 Key: HADOOP-76
>                 URL: http://issues.apache.org/jira/browse/HADOOP-76
>             Project: Hadoop
>          Issue Type: Improvement
>          Components: mapred
>    Affects Versions: 0.1.0
>            Reporter: Doug Cutting
>         Assigned To: Sanjay Dahiya
>            Priority: Minor
>         Attachments: Hadoop-76.patch, spec_reducev.patch
>
>
> As a first step, reduce task outputs should go to temporary files which are renamed when
the task completes.

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