mulitgraph support in giraph
----------------------------

                 Key: GIRAPH-141
                 URL: https://issues.apache.org/jira/browse/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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