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Posted to common-dev@hadoop.apache.org by "Chris Douglas (JIRA)" <ji...@apache.org> on 2008/05/07 01:07:56 UTC

[jira] Commented: (HADOOP-3226) Run combiner when merging spills from map output

    [ https://issues.apache.org/jira/browse/HADOOP-3226?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12594734#action_12594734 ] 

Chris Douglas commented on HADOOP-3226:
---------------------------------------

No tests are updated or included, as the existing tests will verify correctness of the results and the new functionality is both difficult to test and deviations from it are not necessarily incorrect.

> 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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