The 3rd parameter to Graph() is a default Vertex to be supplied if there are
edges with vertices that don't appear in the vertices RDD.
2 choices:
1) supply a "null" VertexAttributes:
val graph = Graph(vertices, edges, VertexAttributes(...)) // fill in
the attributes as makes sense
2) let GraphX supply a null instead
val graph = Graph(vertices, edges) // vertices found in 'edges' but
not in 'vertices' will be set to null
-------------------------------------------------------------------------------
Robin East
Spark GraphX in Action Michael Malak and Robin East
Manning Publications Co.
http://www.manning.com/books/spark-graphx-in-action
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