@Override
    public default Configuration getConf() {
        throw new UnsupportedOperationException(this.getClass().getSimpleName() + " can only have its configuration set, not received");
    }
@author Marko A. Rodriguez (http://markorodriguez.com)
hadoop-gremlin/src/main/java/org/apache/tinkerpop/gremlin/hadoop/structure/io/HadoopPoolsConfigurable.java