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From André Kelpe (Created) (JIRA) <>
Subject [jira] [Created] (GIRAPH-141) mulitgraph support in giraph
Date Sat, 04 Feb 2012 09:19:53 GMT
mulitgraph support in giraph

                 Key: GIRAPH-141
             Project: Giraph
          Issue Type: Improvement
          Components: graph
            Reporter: André Kelpe

The current vertex API only supports simple graphs, meaning that there can only ever be one
edge between two vertices. Many graphs like the road network are in fact multigraphs, where
many edges can connect two vertices at the same time.

Support for this could be added by introducing an Iterator<EdgeWritable> getEdgeValue()
or a similar construct. Maybe introducing a slim object like a Connector between the edge
and the vertex is also a good idea, so that you could do something like:

for (final Connector<EdgeWritable, VertexWritable> conn: getEdgeValues(){
     final EdgeWritable edge = conn.getEdge();
     final VertexWritable otherVertex = conn.getOther();
    // do interesting stuff

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