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From "Edward J. Yoon (JIRA)" <>
Subject [jira] Commented: (HAMA-79) MappedMatrix Input/output formatter
Date Mon, 13 Oct 2008 08:42:46 GMT


Edward J. Yoon commented on HAMA-79:

Hmm, I guess it can be used such as intermediate file format.  

If we store the 2d matrix to file as a high-level structure (e.g. r-tree or Map<row, Map<column,
entry>>) on HDFS, it'll same with hbase structure and heavy. This is a low-level file
format for some operation that doesn't need to communicate between map tasks.

> MappedMatrix Input/output formatter
> -----------------------------------
>                 Key: HAMA-79
>                 URL:
>             Project: Hama
>          Issue Type: New Feature
>          Components: mapred 
>            Reporter: Edward J. Yoon
>             Fix For: 0.1.0
> MappedMatrixInput/Output formmatter is implementation of an row by column matrix as a
one-dimensional map.
> A 2D matrix can be mapped onto a 1D map, like so: 
>  [a b c]
>  [d e f] 
> <<row0,column0>, a>
> <<row0,column1>, b>
> ...

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