clusters.getHost("h1").setOsType("centos5");
clusters.getHost("h1").persist();
clusters.mapHostToCluster("h1", "c1");
Service s1 = serviceFactory.createNew(c1, "HDFS");
c1.addService(s1);
s1.persist();
ServiceComponent sc1 = serviceComponentFactory.createNew(s1, "DATANODE");
s1.addServiceComponent(sc1);
sc1.setDesiredState(State.UNINSTALLED);
sc1.persist();
ServiceComponentHost sch1 = serviceComponentHostFactory.createNew(sc1, "h1",