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From "Owen O'Malley (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-5223) Refactor reduce shuffle code
Date Wed, 11 Feb 2009 18:46:59 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-5223?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12672716#action_12672716
] 

Owen O'Malley commented on HADOOP-5223:
---------------------------------------

We also plan to incorporate HADOOP-1338 into this patch, where the fetchers will request a
list of map outputs and the map outputs look like:

<vint id length> <task id>
<vint compressed size>
<vint raw size>
<map data>
... repeated for each map.

> Refactor reduce shuffle code
> ----------------------------
>
>                 Key: HADOOP-5223
>                 URL: https://issues.apache.org/jira/browse/HADOOP-5223
>             Project: Hadoop Core
>          Issue Type: Improvement
>          Components: mapred
>            Reporter: Owen O'Malley
>            Assignee: Owen O'Malley
>             Fix For: 0.21.0
>
>
> The reduce shuffle code has become very complex and entangled. I think we should move
it out of ReduceTask and into a separate package (org.apache.hadoop.mapred.task.reduce). Details
to follow.

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