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From "Edward J. Yoon (Updated) (JIRA)" <>
Subject [jira] [Updated] (HAMA-458) Add Combiners
Date Tue, 25 Oct 2011 07:44:32 GMT


Edward J. Yoon updated HAMA-458:

    Attachment: combiner_v01.patch

I didn't test this patch but, we can simply add combiner function like this.

Then, the communication can be minimized since only the summarized values are exchanged among
the peers in each superstep.
> Add Combiners
> -------------
>                 Key: HAMA-458
>                 URL:
>             Project: Hama
>          Issue Type: New Feature
>            Reporter: Thomas Jungblut
>         Attachments: combiner_v01.patch
> We have spoken about it on the mailing list:
> 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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