Large-memory improvements (Memory reduced vertex implementation, fast failure, 
added settings) 

                 Key: GIRAPH-91
             Project: Giraph
          Issue Type: Improvement
            Reporter: Avery Ching

Current vertex implementation uses a HashMap for storing the edges, which is 
quite memory heavy for large graphs.  The default settings in Giraph need to be 
improved for large graphs and heaps of >20G.

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