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Posted to dev@hama.apache.org by "Edward J. Yoon (JIRA)" <ji...@apache.org> on 2008/10/13 06:26:46 UTC
[jira] Created: (HAMA-79) MappedMatrix Input/output formatter
MappedMatrix Input/output formatter
-----------------------------------
Key: HAMA-79
URL: https://issues.apache.org/jira/browse/HAMA-79
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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[jira] Resolved: (HAMA-79) MappedMatrix Input/output formatter
Posted by "Edward J. Yoon (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/HAMA-79?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Edward J. Yoon resolved HAMA-79.
--------------------------------
Resolution: Won't Fix
Assignee: Edward J. Yoon
There is a lot of writable (e.g., TwoDArrayWritable, MapWritable, Int/Double/FloatWritable,...,etc) and InputFormatter. So I think we don't need to provide this.
> MappedMatrix Input/output formatter
> -----------------------------------
>
> Key: HAMA-79
> URL: https://issues.apache.org/jira/browse/HAMA-79
> Project: Hama
> Issue Type: New Feature
> Components: mapred
> Reporter: Edward J. Yoon
> Assignee: 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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You can reply to this email to add a comment to the issue online.
[jira] Commented: (HAMA-79) MappedMatrix Input/output formatter
Posted by "Samuel Guo (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/HAMA-79?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12638962#action_12638962 ]
Samuel Guo commented on HAMA-79:
--------------------------------
why we map a 2D matrix onto a 1D map? Is there any advantage of this kind of format? I am confusing about it.
> MappedMatrix Input/output formatter
> -----------------------------------
>
> Key: HAMA-79
> URL: https://issues.apache.org/jira/browse/HAMA-79
> 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>
> ...
--
This message is automatically generated by JIRA.
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You can reply to this email to add a comment to the issue online.
[jira] Commented: (HAMA-79) MappedMatrix Input/output formatter
Posted by "Edward J. Yoon (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/HAMA-79?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12638974#action_12638974 ]
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: https://issues.apache.org/jira/browse/HAMA-79
> 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>
> ...
--
This message is automatically generated by JIRA.
-
You can reply to this email to add a comment to the issue online.