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Date: Wed, 19 Oct 2011 19:11:10 +0000 (UTC)
From: "Thomas Jungblut (Updated) (JIRA)" <jira@apache.org>
To: hama-dev@incubator.apache.org
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Subject: [jira] [Updated] (HAMA-458) Add Combiners
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     [ https://issues.apache.org/jira/browse/HAMA-458?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Thomas Jungblut updated HAMA-458:
---------------------------------

      Description: 
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. 

  was:
We have spoken about it on the mailing list:
http://www.mail-archive.com/hama-dev@incubator.apache.org/msg05540.html

Small extract:

{quote}
E.g: 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. 

    Fix Version/s:     (was: 0.5.0)
    
> Add Combiners
> -------------
>
>                 Key: HAMA-458
>                 URL: https://issues.apache.org/jira/browse/HAMA-458
>             Project: Hama
>          Issue Type: New Feature
>            Reporter: Thomas Jungblut
>
> 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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