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From "Arun Suresh (Created) (JIRA)" <j...@apache.org>
Subject [jira] [Created] (GIRAPH-96) Support for Graphs with Huge adjacency lists
Date Thu, 17 Nov 2011 14:50:51 GMT
Support for Graphs with Huge adjacency lists
--------------------------------------------

                 Key: GIRAPH-96
                 URL: https://issues.apache.org/jira/browse/GIRAPH-96
             Project: Giraph
          Issue Type: Improvement
            Reporter: Arun Suresh


Currently the vertex initialize() method is passed the complete adjacency list as a HashMap.
All the current concrete implementations of Vertex iterate over the adjacency list and recreate
new Data Structures within the Vertex instance to hold/manipulate the adjacency list. This
would seize to be feasible once the size of the adjacency list becomes really huge.

I propose storing the adjacency list and all vertex information (and incoming messages ?)
in a distributed data store such as HBase. The adjacency list can be lazily loaded via HBase
Scans. I was thinking of an HBase schema where the row Id is a concatenation of VertexID+OutboundVertexId
with a single column containing the edge.

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