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From "Sebastian Schelter (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (GIRAPH-141) mulitgraph support in giraph
Date Thu, 10 May 2012 08:31:48 GMT

    [ https://issues.apache.org/jira/browse/GIRAPH-141?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13272189#comment-13272189
] 

Sebastian Schelter commented on GIRAPH-141:
-------------------------------------------

I don't think it would be a good idea to force all users to use multigraphs. Furthermore a
good principle of software engineering is to always search for the simplest solution. I'm
not sure whether it would really be so easy to implement real multigraph support in the whole
system.

Why not have a base vertex class that transparently (!) wraps multigraphs into simple graphs?
                
> 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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