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From "Hyunsik Choi (JIRA)" <>
Subject [jira] Updated: (HAMA-196) Design the input/output data types
Date Tue, 06 Oct 2009 02:56:26 GMT


Hyunsik Choi updated HAMA-196:

    Attachment: HAMA-196.patch

I attached the RecordReader abstract class. It is borrowed from the mapreduce of Hadoop 0.20.
I think that most parts of the original RecordReader are also useful in hama, but we need
a way to randomly access some record of input files. So, I added the getValueByKey(KEYIN key)
method to RecordReader.

> Design the input/output data types
> ----------------------------------
>                 Key: HAMA-196
>                 URL:
>             Project: Hama
>          Issue Type: New Feature
>          Components: graph
>            Reporter: Hyunsik Choi
>            Assignee: Hyunsik Choi
>         Attachments: HAMA-196.patch
> Like MapReduce, Angrapa also need input/output data types like key/value pairs of MapReduce.
In Angrapa, programs will handle all of data as vertices, each of which has a key and an adjacent
list. Thus, I think it would be good that a key is an array of bytes (i.e., byte [] ) and
an adjacent list is keys. 
> In addition, most of graph algorithms focus on graph features and labels of either vertices
or edges. They may not need keys. Therefore, RecordReader would need only VERTEX; that is
> What do you think about?

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