[jira] Commented: (HAMA-119) block-matrix addition

["Edward J. Yoon (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HAMA-119?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12665033#action_12665033 ] 

Edward J. Yoon commented on HAMA-119:
-------------------------------------

Seems not slow. So, I think we don't need to collect blocks.

We may want to just open two scanner at the inputformat instead of using (table.getRow) each map(). Then, we can reduce HBase requests.

> block-matrix addition
> ---------------------
>
>                 Key: HAMA-119
>                 URL: https://issues.apache.org/jira/browse/HAMA-119
>             Project: Hama
>          Issue Type: Improvement
>          Components: mapred 
>            Reporter: Edward J. Yoon
>            Assignee: Edward J. Yoon
>             Fix For: 0.1.0
>
>
> ||Trunk 722320 || Add || 2 node ||3,000 ||3,000 ||4||2||298 seconds || 1,053,503,366 || 1,575,781,107 ||
> ||Trunk 722320 || Mult ||2 node ||3,000 ||3,000 ||4||2||124 seconds || 590,672,392 || 872,228,808 ||
> add too slow. write a formula for the general case of block matrix addition.

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