[ http://issues.apache.org/jira/browse/HADOOP-76?page=all ]
Sanjay Dahiya updated HADOOP-76:
--------------------------------
Attachment: Hadoop-76_3.patch
The patch failed with Streaming test when run twice in succession, because
output file created in first run still exists in second run and
PhasedFileSystem was not handling an exception while rename.
This patch fixes the issue.
> 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,
> Hadoop-76_3.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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