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Date: Thu, 26 Oct 2006 12:27:18 -0700 (PDT)
From: "Devaraj Das (JIRA)" <jira@apache.org>
To: hadoop-dev@lucene.apache.org
Subject: [jira] Commented: (HADOOP-76) Implement speculative re-execution of
 reduces
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    [ http://issues.apache.org/jira/browse/HADOOP-76?page=comments#action_12444960 ] 
            
Devaraj Das commented on HADOOP-76:
-----------------------------------

Regarding the PhasedRecordWriter class, I think this should provide the option of creating a file, write to them and then call commit or abort. The current implementation binds it to a RecordWriter, but this should cater to things like Sequence files also (for e.g., RandomWriter should be able to use this functionality).

> 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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