private void processNext() {
        this.mapReduce.map(ComputerGraph.mapReduce(this.inputIterator.next()._2().get()), this.mapIteratorEmitter);
    }
@author Marko A. Rodriguez (http://markorodriguez.com)
spark-gremlin/src/main/java/org/apache/tinkerpop/gremlin/spark/process/computer/MapIterator.java