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From "Edward J. Yoon (JIRA)" <j...@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'
Date Tue, 24 Feb 2009 02:16:02 GMT

    [ https://issues.apache.org/jira/browse/HAMA-154?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12676153#action_12676153
] 

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

>> 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? 

Did you mean the addition of multiple matrices? Then, I guess an scanners of each table can
be opened at once.

> [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
>
>
> 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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