[jira] [Commented] (GIRAPH-141) multigraph support in giraph

["Avery Ching (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/GIRAPH-141?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13402935#comment-13402935 ] 

Avery Ching commented on GIRAPH-141:
------------------------------------

I think addEdgeRequest would still need J edgeId.  I'm not really a multi-graph user.  Anyone else have comments?
                
> multigraph 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
>            Assignee: Alessandro Presta
>
> 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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