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Date: Wed, 21 Dec 2011 07:48:31 +0000 (UTC)
From: "Avery Ching (Assigned) (JIRA)" <jira@apache.org>
To: giraph-dev@incubator.apache.org
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Subject: [jira] [Assigned] (GIRAPH-113) Change cast to Vertex used in
 prepareSuperstep() to BasicVertex
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     [ https://issues.apache.org/jira/browse/GIRAPH-113?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Avery Ching reassigned GIRAPH-113:
----------------------------------

    Assignee: Yuanyuan Tian  (was: Avery Ching)
    
> Change cast to Vertex used in prepareSuperstep() to BasicVertex
> ---------------------------------------------------------------
>
>                 Key: GIRAPH-113
>                 URL: https://issues.apache.org/jira/browse/GIRAPH-113
>             Project: Giraph
>          Issue Type: Bug
>            Reporter: Yuanyuan Tian
>            Assignee: Yuanyuan Tian
>            Priority: Minor
>         Attachments: GIRAPH-113.patch
>
>
> Hi,
> I decided to use LongDoubleFloatDoubleVertex in a graph algorithm because it uses more compact and efficient mahout collections. However I run into an error when running the algorithm:
> java.lang.ClassCastException: org.apache.giraph.graph.LongDoubleFloatDoubleVertex cannot be cast to org.apache.giraph.graph.Vertex
> at org.apache.giraph.comm.BasicRPCCommunications.prepareSuperstep(BasicRPCCommunications.java:1016)
> at org.apache.giraph.graph.BspServiceWorker.startSuperstep(BspServiceWorker.java:843)
> at org.apache.giraph.graph.GraphMapper.map(GraphMapper.java:569)
> at org.apache.giraph.graph.GraphMapper.run(GraphMapper.java:728)
> ... 7 more
> Basically, the problem is that in BasicRPCCommunications.prepareSuperStep(), the LongDoubleFloatDoubleVertex are cast to Vertex in the following code fragment. But LongDoubleFloatDoubleVertex inherits from BasicVertex instead of Vertex.
> if (vertex != null) {
>    ((MutableVertex<I, V, E, M>) vertex).setVertexId(vertexIndex);
>    partition.putVertex((Vertex<I, V, E, M>) vertex);
> } else if (originalVertex != null) {
>   partition.removeVertex(originalVertex.getVertexId());
> }
> I did a simple change: cast LongDoubleFloatDoubleVertex to BasicVertex. The problem went away, and the algorithm finished without any error. But I am not sure this change has any implication to other parts of the code. So, I hope to get some comments from the Giraph developers.
> if (vertex != null) {
>    ((MutableVertex<I, V, E, M>) vertex).setVertexId(vertexIndex);
>    partition.putVertex((BasicVertex<I, V, E, M>) vertex);
> } else if (originalVertex != null) {
>   partition.removeVertex(originalVertex.getVertexId());
> }

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