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From "Roman K (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (GIRAPH-141) mulitgraph support in giraph
Date Thu, 10 May 2012 09:07:27 GMT

    [ https://issues.apache.org/jira/browse/GIRAPH-141?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13272201#comment-13272201
] 

Roman K commented on GIRAPH-141:
--------------------------------

Sorry for taking your time, but I am not sure I understand you correctly.
Are you talking about Avery's idea, to sub-class the BasicVertex class with some BasicMultiVertexClass
and etc. or about introducing some MultiValueEdge class which implements Writable and could
be "hidden" inside the existing simple graph structure?
                
> 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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