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From Akshay Trivedi <trivedi.aksh...@gmail.com>
Subject Re: how to change graph
Date Thu, 17 Apr 2014 04:32:01 GMT
Does removeVertexRequest(I vertexId) have to be implemented? Is there
any pre-defined class for this?

On Wed, Apr 16, 2014 at 8:33 PM, Avery Ching <aching@apache.org> wrote:
> Yes, this is one of the great things about Giraph (not many other graph
> computation frameworks allow graph mutation).  See the Computation class
> (i.e.)
>
>   /**
>    * Sends a request to create a vertex that will be available during the
>    * next superstep.
>    *
>    * @param id Vertex id
>    * @param value Vertex value
>    * @param edges Initial edges
>    */
>   void addVertexRequest(I id, V value, OutEdges<I, E> edges) throws
> IOException;
>
>   /**
>    * Sends a request to create a vertex that will be available during the
>    * next superstep.
>    *
>    * @param id Vertex id
>    * @param value Vertex value
>    */
>   void addVertexRequest(I id, V value) throws IOException;
>
>   /**
>    * Request to remove a vertex from the graph
>    * (applied just prior to the next superstep).
>    *
>    * @param vertexId Id of the vertex to be removed.
>    */
>   void removeVertexRequest(I vertexId) throws IOException;
>
>   /**
>    * Request to add an edge of a vertex in the graph
>    * (processed just prior to the next superstep)
>    *
>    * @param sourceVertexId Source vertex id of edge
>    * @param edge Edge to add
>    */
>   void addEdgeRequest(I sourceVertexId, Edge<I, E> edge) throws IOException;
>
>   /**
>    * Request to remove all edges from a given source vertex to a given
> target
>    * vertex (processed just prior to the next superstep).
>    *
>    * @param sourceVertexId Source vertex id
>    * @param targetVertexId Target vertex id
>    */
>   void removeEdgesRequest(I sourceVertexId, I targetVertexId)
>     throws IOException;
>
>
>
> On 4/16/14, 7:23 AM, Akshay Trivedi wrote:
>>
>> Hi,
>> I wanted to do some computation on graph and delete some edges between
>> supersteps. Can this be done using giraph?? I have heard of
>> MutableVertex class but I dont know whether it can be used to delete
>> edges. Also is MutableVertex abstract class and has to be
>> implemented??
>>
>> Regards,
>> Akshay
>
>

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