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Posted to common-dev@hadoop.apache.org by "Chris Douglas (JIRA)" <ji...@apache.org> on 2008/09/02 03:40:44 UTC
[jira] Updated: (HADOOP-3446) The reduce task should not flush the
in memory file system before starting the reducer
[ https://issues.apache.org/jira/browse/HADOOP-3446?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Chris Douglas updated HADOOP-3446:
----------------------------------
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
>
>
> 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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