@Override
    public void close() {
        try {
            for (final RecordReader reader : this.readers) {
                reader.close();
            }
        } catch (final IOException e) {
            throw new IllegalStateException(e.getMessage(), e);
        }
    }
@author Marko A. Rodriguez (http://markorodriguez.com)
hadoop-gremlin/src/main/java/org/apache/tinkerpop/gremlin/hadoop/structure/io/HadoopElementIterator.java