public static HadoopGraph open(final String configurationFile) throws ConfigurationException {
        if (null == configurationFile) throw Graph.Exceptions.argumentCanNotBeNull("configurationFile");
        final Configurations configs = new Configurations();
        return open(configs.properties(configurationFile));
    }
@author Marko A. Rodriguez (http://markorodriguez.com)
hadoop-gremlin/src/main/java/org/apache/tinkerpop/gremlin/hadoop/structure/HadoopGraph.java