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From "Alessandro Presta (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (GIRAPH-141) multigraph support in giraph
Date Fri, 14 Dec 2012 03:46:14 GMT

     [ https://issues.apache.org/jira/browse/GIRAPH-141?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Alessandro Presta updated GIRAPH-141:
-------------------------------------

    Attachment:     (was: GIRAPH-141.patch)
    
> 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
>
>
> 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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