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From Severin Andreas Corsten <>
Subject Input And Partitioning
Date Thu, 08 Sep 2011 18:07:32 GMT
Hello everyone,

I tried writing my own code using Giraph and like it a lot but I have some 
questions regarding the input splinting and the partitioning of the graph.

1: Am I right in the assumption that Giraph does not split the input file 
by itself. Assume that I have got a graph in one single file, Giraph sends 
the whole graph to one worker while the rest of the workers is just idle. 

2: I read through the source code and found a part saying that vertices 
must be presented in id-order. Is that a task the user has to do or is 
there a workaround to have vertices not in id-order?

3: The VertexRange class provides the assignment between vertices and 
workers. Is there  a way to override the standard implementation and use a 
custom assignment system?

Thanks in advance.

Kind regards / Mit freundlichen Grüßen

Severin Andreas Corsten
DHBW-Student Business Informatics 2009 - University Programs
IBM Sales & Distribution, Human Resources

Phone: 1-408-927-2750 
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Mainz, 55131

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