GraphX has a Shortest Paths algorithm implementation which will tell you, for
all vertices in the graph, the shortest distance to a specific ('landmark')
vertex. The returned value is '/a graph where each vertex attribute is a map
containing the shortest-path distance to each reachable landmark vertex/'.
If there is no path to the landmark vertex then the map for the source
vertex is empty



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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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