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From "Thomas Jungblut (JIRA)" <>
Subject [jira] [Commented] (HAMA-258) Design a input and output system
Date Tue, 12 Apr 2011 15:23:05 GMT


Thomas Jungblut commented on HAMA-258:

Looks good, but we should provide readers and writers as described in the Pregel paper.
These logics are just messing up the code of a BSP class. 

We can provide a output collector on each peer.

I'm currently writing a blog post for partitioning and splitting, I'll post it then.
Basically it provides just a split for each groom with the modulo function : vertexId % sizeOfCluster.
Then it just get's writtin into a SequenceFile and the groom can access it.

This is going to be a more scalable solution, what if the messages are too large for the ram
of the groom. Most people just have a small cluster but many data. We should take this into

> Design a input and output system
> --------------------------------
>                 Key: HAMA-258
>                 URL:
>             Project: Hama
>          Issue Type: New Feature
>          Components: bsp
>    Affects Versions: 0.3.0
>            Reporter: Edward J. Yoon
>            Assignee: Edward J. Yoon
>             Fix For: 0.3.0
> This issue will handle the input and output system with data splitter.

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