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Posted to common-dev@hadoop.apache.org by "Owen O'Malley (JIRA)" <ji...@apache.org> on 2006/11/01 06:43:41 UTC
[jira] Commented: (HADOOP-76) Implement speculative re-execution of
reduces
[ 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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