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https://issues.apache.org/jira/browse/GIRAPH-113?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Avery Ching resolved GIRAPH-113.
--------------------------------
Resolution: Fixed
Thanks for the fix YuanYuan! I've added you as a contributor to Giraph.
> 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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