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Posted to dev@hama.apache.org by "Edward J. Yoon (JIRA)" <ji...@apache.org> on 2009/03/02 01:25:12 UTC
[jira] Commented: (HAMA-154) [Performance]Combine multi-mapreduce
jobs into a single mapreduce job while computing such as 'C=alpha*B + A'
[ https://issues.apache.org/jira/browse/HAMA-154?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12677867#action_12677867 ]
Edward J. Yoon commented on HAMA-154:
-------------------------------------
Looks great to me. +1
> [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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