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From "Devaraj Das (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-76) Implement speculative re-execution of reduces
Date Tue, 07 Nov 2006 15:24:55 GMT
    [ http://issues.apache.org/jira/browse/HADOOP-76?page=comments#action_12447830 ] 
            
Devaraj Das commented on HADOOP-76:
-----------------------------------

One more comment - need to document somewhere how exactly (what config params) a user of the
PhasedFileSystem (a map method) can access the JobId, TaskId and TIPId when he wants to create
an instance of PhasedFileSystem. Better yet, add a new constructor in PhasedFileSystem that
takes a JobConf object. Inside that constructor, you can get the JobId, TaskId and TIPId values
and proceed. The user doesn't have to bother about details in this case.

> 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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