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From "Thomas Jungblut (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HAMA-580) Improve input of graph module
Date Wed, 23 May 2012 05:24:41 GMT

    [ https://issues.apache.org/jira/browse/HAMA-580?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13281411#comment-13281411
] 

Thomas Jungblut commented on HAMA-580:
--------------------------------------

Great to hear, hopefully this issue will not destroy your cluster ;)

Basically we can simply write the ID and VALUE of a vertex directly, but they must meet the
requirement that the client and the task has the classes available to deserialize.
So for example for Pagerank:
Text/DoubleWritable (this can be null though) as vertex serialization and ArrayWritable its
just Text/NullWritable. 
VertexArrayWritable is very verbose as well and I can rewrite it. 
I would solve this like in GraphJobRunner is dealing with the vertex messages, by setting
the classes statically and then just reading them back. 

Sorry for that problem, but I just wanted to make it run when coding the generics for the
graph package.
                
> Improve input of graph module
> -----------------------------
>
>                 Key: HAMA-580
>                 URL: https://issues.apache.org/jira/browse/HAMA-580
>             Project: Hama
>          Issue Type: Improvement
>          Components: graph
>    Affects Versions: 0.5.0
>            Reporter: Thomas Jungblut
>            Assignee: Thomas Jungblut
>             Fix For: 0.5.0
>
>
> Currently it is too verbose, the wikipedia dataset is going to be bloated from 0.95gb
to 5gb just because it is writing the classes x-times.

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