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From "Sanjay Dahiya (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HADOOP-76) Implement speculative re-execution of reduces
Date Thu, 09 Nov 2006 11:15:40 GMT
     [ http://issues.apache.org/jira/browse/HADOOP-76?page=all ]

Sanjay Dahiya updated HADOOP-76:
--------------------------------

    Attachment: Hadoop-76_2.patch

Changes in this patch update 

1. PhasedFileSystem has extra constructor that takes an JobConf
2. PhasedFileSystem now handles file overwrite flag properly. 

3. commit/abort can be done for a single file or for all files created by this FS. 
4. The method for commit is split in 2 function one is pvt with an extra boolean variable
to avoid concurrent modification while committing in a iterator loop. 
 4. reduceProgress calculation is changed, earlier it was dividing the progress by reduces.length
twice, once while update status and then while checking for spec tasks, which was incorrect.


Thanks Devaraj for the review. 

> 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, Hadoop-76_2.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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