@Override
    public synchronized void close() throws IOException {
        this.lineRecordReader.close();
    }
@author Daniel Kuppitz (http://gremlin.guru)
@author Marko A. Rodriguez (http://markorodriguez.com)
hadoop-gremlin/src/main/java/org/apache/tinkerpop/gremlin/hadoop/structure/io/script/ScriptRecordReader.java