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From "Thomas Jungblut (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HAMA-258) Design a input and output system
Date Mon, 07 Nov 2011 11:58:51 GMT

    [ https://issues.apache.org/jira/browse/HAMA-258?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13145361#comment-13145361
] 

Thomas Jungblut commented on HAMA-258:
--------------------------------------

Multiple splits per tasks should be actually easy, we can use the combine file split: http://hadoop.apache.org/mapreduce/docs/r0.21.0/api/org/apache/hadoop/mapreduce/lib/input/CombineFileSplit.html

It will take care of the equally distribution of the blocks. You can provide via "mapred.max.split.size"
a split size for a task.
We just have to calculate this split size. But it is trivial, sum(block_sizes) / number of
tasks.
Or the user could directly set this size. 

I'm not to sure currently. 
                
> Design a input and output system
> --------------------------------
>
>                 Key: HAMA-258
>                 URL: https://issues.apache.org/jira/browse/HAMA-258
>             Project: Hama
>          Issue Type: New Feature
>          Components: bsp
>    Affects Versions: 0.3.0
>            Reporter: Edward J. Yoon
>            Assignee: Edward J. Yoon
>             Fix For: 0.4.0
>
>         Attachments: HAMA-258_improved.patch, IONoInput.patch, io_v01.patch, io_v02.patch,
io_v03.patch, io_v04.patch
>
>
> This issue will handle the input and output system with data splitter.

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