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Date: Wed, 4 Mar 2009 01:09:56 -0800 (PST)
From: "Edward J. Yoon (JIRA)" <jira@apache.org>
To: hama-dev@incubator.apache.org
Subject: [jira] Commented: (HAMA-154) [Performance]Combine multi-mapreduce
 jobs into a single mapreduce job while computing such as 'C=alpha*B + A'
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    [ https://issues.apache.org/jira/browse/HAMA-154?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12678647#action_12678647 ] 

Edward J. Yoon commented on HAMA-154:
-------------------------------------

It's my test result.

Matrix a, b : 5000 * 5000 
c = a.add(0.343, b);

turnk version : 20 minutes
patch applied version : 8 minutes

> [Performance]Combine multi-mapreduce jobs into a single mapreduce job while computing such as 'C=alpha*B + A' 
> --------------------------------------------------------------------------------------------------------------
>
>                 Key: HAMA-154
>                 URL: https://issues.apache.org/jira/browse/HAMA-154
>             Project: Hama
>          Issue Type: Improvement
>          Components: implementation
>    Affects Versions: 0.1.0
>            Reporter: Samuel Guo
>             Fix For: 0.1.0
>
>         Attachments: HAMA-154.patch, HAMA-154_v02.patch
>
>
> now, In Hama we use two map-reduce jobs to do 'C=alpha*B + A'.
> first job is to generate a matrix B' = alpha * B
> second job is to generate the result matrix C = B' + A
> I think the first map-reduce job is unneccesary for we can do the constant-multiplication during Addition-MapReducing.
> And we also encount the same problem during computing 'A1 + A2 + ... + An'.
> we need to generate (n-1) hbase-tables for the temp results during addition. Can we just combine n-1 addition-mapreduce jobs into only a simple one?

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