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From "Hyunsik Choi (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (GIRAPH-141) multigraph support in giraph
Date Fri, 14 Dec 2012 04:48:15 GMT

    [ https://issues.apache.org/jira/browse/GIRAPH-141?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13532045#comment-13532045
] 

Hyunsik Choi commented on GIRAPH-141:
-------------------------------------

This precommit test error is caused by the jenkins job based on svn repository. Please ignore
the above comment. I'll modify the jenkins job.
                
> 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
>         Attachments: GIRAPH-141.patch, GIRAPH-141.patch, GIRAPH-141.patch
>
>
> 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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