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https://issues.apache.org/jira/browse/GIRAPH-141?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13245145#comment-13245145
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Paolo Castagna commented on GIRAPH-141:
---------------------------------------

Just to add another example of multigraph: 
[RDF|http://en.wikipedia.org/wiki/Resource_Description_Framework] data model is 
a labelled directed multigraph.
                
> 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:
> {code} 
> for (final Connector<EdgeWritable, VertexWritable> conn: getEdgeValues(){
>      final EdgeWritable edge = conn.getEdge();
>      final VertexWritable otherVertex = conn.getOther();
>      doInterestingStuff(otherVertex);
>      doMoreInterestingStuff(edge);
> }
> {code} 

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