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From "Robert Chansler (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HADOOP-3366) Shuffle/Merge improvements
Date Tue, 22 Jul 2008 17:53:31 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-3366?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Robert Chansler updated HADOOP-3366:
------------------------------------

    Release Note: Improved shuffle so that all fetched map-outputs are kept in-memory before
being merged by stalling the shuffle so that the in-memory merge executes and frees up memory
for the shuffle.  (was: Shuffle has been improved to ensure that all fetched map-outputs are
kept in-memory before being merged. This is accomplished by stalling the shuffle so that the
in-memory merge executes and frees up memory for the shuffle.)

> Shuffle/Merge improvements
> --------------------------
>
>                 Key: HADOOP-3366
>                 URL: https://issues.apache.org/jira/browse/HADOOP-3366
>             Project: Hadoop Core
>          Issue Type: Improvement
>          Components: mapred
>            Reporter: Arun C Murthy
>            Assignee: Arun C Murthy
>             Fix For: 0.18.0
>
>         Attachments: 3366.1.patch, 3366.1.patch, 3366.reducetask.patch, HADOOP-3366_0_20080605.patch,
HADOOP-3366_2_20080606.patch, HADOOP-3366_2_20080606.patch, ifile.patch
>
>
> This is intended to be a meta-issue to track various improvements to shuffle/merge in
the reducer.

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