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From "Edward J. Yoon (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HAMA-125) Refactor dense matrix storage
Date Fri, 05 Dec 2008 10:02:44 GMT

    [ https://issues.apache.org/jira/browse/HAMA-125?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12653723#action_12653723
] 

Edward J. Yoon commented on HAMA-125:
-------------------------------------

Also, 

- BlockingMapred
- Reduce writers

> Refactor dense matrix storage
> -----------------------------
>
>                 Key: HAMA-125
>                 URL: https://issues.apache.org/jira/browse/HAMA-125
>             Project: Hama
>          Issue Type: Improvement
>          Components: implementation
>    Affects Versions: 0.1.0
>            Reporter: Edward J. Yoon
>             Fix For: 0.1.0
>
>
> Current entry is too small, have a lot of column keys. So, it cause too many requests
over hbase.
> Current table schema: 
>                        column:
> =============================
> rowKey1       column:0   <0.323..>
>                        column:1   <0.413..>
>                       ...             N
> rowKey2 
> ...
> We can group the columns as describe below. (2D array is too complex.)
>                        vector:
> =============================
> rowKey1       vector:0   <0 ~ 9999999>
>                        vector:1   <10000000 ~ 19999999>
>                       ...             
> rowKey2 
> ...
> ----
> Should be changed things :
> - DenseMatrix : get/set(), get/setRow(), get/setColumn() ..
> - DenseVector : get/set(), subVector(), ...
> ...

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