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https://issues.apache.org/jira/browse/HADOOP-4699?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12654599#action_12654599
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Chris Douglas commented on HADOOP-4699:
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HADOOP-4688 validates this patch. It wasn't committed before Hudson ran, but it
passes on my machine.
> Change TaskTracker.MapOutputServlet to send only the IFile segment, validate
> checksum in Reduce
> -----------------------------------------------------------------------------------------------
>
> Key: HADOOP-4699
> URL: https://issues.apache.org/jira/browse/HADOOP-4699
> Project: Hadoop Core
> Issue Type: Improvement
> Reporter: Chris Douglas
> Assignee: Chris Douglas
> Fix For: 0.20.0
>
> Attachments: 4699-0.patch
>
>
> Instead of validating the checksum of the IFile segment in MapOutputServlet,
> validation may be left to the reduce. While failures may not be detected
> until late in the reduce, the throughput and CPU improvements should make up
> for it in the average case.
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