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From "Sanjay Dahiya (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-76) Implement speculative re-execution of reduces
Date Fri, 03 Nov 2006 17:41:19 GMT
    [ http://issues.apache.org/jira/browse/HADOOP-76?page=comments#action_12447025 ] 
            
Sanjay Dahiya commented on HADOOP-76:
-------------------------------------

One important point that needs to be reviewed in this patch is extra checks for speculative
reduce tasks in TIP. We may want to inherit some of this in spec maps too or structure it
better. looking for comments on that. 

> 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, Hadoop-76_1.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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