JAXBContext jc = JAXBContext.newInstance("edu.yale.cs.hadoopdb.catalog.xml");
Marshaller marshaller = jc.createMarshaller();
marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT,new Boolean(true));
ObjectFactory factory = new ObjectFactory();
Configuration configuration = factory.createConfiguration();
int node_counter = 0;
int rand_offset = gen.nextInt(nodes.size() - 1);
for(String node : nodes){