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From "Thomas Jungblut (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HAMA-458) Add Combiners
Date Tue, 25 Oct 2011 12:00:32 GMT

    [ https://issues.apache.org/jira/browse/HAMA-458?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13134961#comment-13134961

Thomas Jungblut commented on HAMA-458:

Very nice. +1, but I didn' test. Just reviewed the patch.
> Add Combiners
> -------------
>                 Key: HAMA-458
>                 URL: https://issues.apache.org/jira/browse/HAMA-458
>             Project: Hama
>          Issue Type: New Feature
>            Reporter: Thomas Jungblut
>            Assignee: Edward J. Yoon
>         Attachments: combiner_v01.patch, combiner_v02.patch, combiner_v03.patch
> We have spoken about it on the mailing list:
> http://www.mail-archive.com/hama-dev@incubator.apache.org/msg05540.html
> Small extract:
> {quote}
> When should the combiner be called and in which form. In MapReduce they
> are plain reducers, so we can have the same model but not grouped by a key
> rather than the class name of the message.
> {quote}
> Especially if we could collect all task data on the same host and combine them. This
would yield into better performance.
> We need a smart idea. 

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