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https://issues.apache.org/jira/browse/HADOOP-3446?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Chris Douglas updated HADOOP-3446:
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Status: Patch Available (was: Open)
> The reduce task should not flush the in memory file system before starting
> the reducer
> --------------------------------------------------------------------------------------
>
> Key: HADOOP-3446
> URL: https://issues.apache.org/jira/browse/HADOOP-3446
> Project: Hadoop Core
> Issue Type: Improvement
> Components: mapred
> Reporter: Owen O'Malley
> Assignee: Chris Douglas
> Priority: Critical
> Fix For: 0.19.0
>
> Attachments: 3446-0.patch, 3446-1.patch, 3446-2.patch, 3446-3.patch,
> 3446-4.patch, 3446-5.patch, 3446-6.patch
>
>
> In the case where the entire reduce inputs fit in ram, we currently force the
> input to disk and re-read it before giving it to the reducer. It would be
> much better if we merged from the ramfs and any spills to feed the reducer
> its input.
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