[jira] [Resolved] (HAMA-458) Add Combiners

["Edward J. Yoon (Resolved) (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HAMA-458?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Edward J. Yoon resolved HAMA-458.
---------------------------------

    Resolution: Fixed

Thanks for review. Builds OK, and test passed on my cluster.

I just commit this before make other changes.

                
> Add Combiners
> -------------
>
>                 Key: HAMA-458
>                 URL: https://issues.apache.org/jira/browse/HAMA-458
>             Project: Hama
>          Issue Type: New Feature
>          Components: bsp
>    Affects Versions: 0.3.0
>            Reporter: Thomas Jungblut
>            Assignee: Edward J. Yoon
>             Fix For: 0.4.0
>
>         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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