Alessandro Presta created GIRAPH-419:
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             Summary: Make VertexResolver easily extendable
                 Key: GIRAPH-419
                 URL: https://issues.apache.org/jira/browse/GIRAPH-419
             Project: Giraph
          Issue Type: Improvement
            Reporter: Alessandro Presta
            Assignee: Alessandro Presta


All the VertexResolver logic is contained in the quite convoluted resolve() 
method, which makes it hard to extend in practice.
We could refactor its functionality by adding two methods like

Vertex resolveVertex(oldVertex, newVertex)
Edge resolveEdge(oldEdge, newEdge)

This would make it easy to define algorithms that use mutations, or even to 
read a vertex value or edge from several rows.

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