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From "Chris Douglas (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HADOOP-3446) The reduce task should not flush the in memory file system before starting the reducer
Date Tue, 02 Sep 2008 07:38:44 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-3446?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Chris Douglas updated HADOOP-3446:
----------------------------------

    Attachment: 3446-4.patch

Added documentation

> 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
>
>
> 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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