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From "Robert Chansler (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HADOOP-3226) Run combiner when merging spills from map output
Date Fri, 27 Jun 2008 21:25:44 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-3226?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Robert Chansler updated HADOOP-3226:
------------------------------------

    Release Note: Added run of the combiner on the map side merge if there are more than min.num.spills.for.combine
(3 by default), and run of the combiner on the reduce-side spills.   (was: Runs the combiner
on the map side merge if there are more than min.num.spills.for.combine (3 by default). Also
runs the combiner on the reduce-side spills. )
    Hadoop Flags: [Incompatible change, Reviewed]  (was: [Reviewed, Incompatible change])

> Run combiner when merging spills from map output
> ------------------------------------------------
>
>                 Key: HADOOP-3226
>                 URL: https://issues.apache.org/jira/browse/HADOOP-3226
>             Project: Hadoop Core
>          Issue Type: Improvement
>            Reporter: Chris Douglas
>            Assignee: Chris Douglas
>             Fix For: 0.18.0
>
>         Attachments: 3226-0.patch, 3226-1.patch, 3226-2.patch, 3226-3.patch
>
>
> When merging spills from the map, running the combiner should further diminish the volume
of data we send to the reduce.

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