final Config c1 = configFactory.createNew(cluster, "core-site",
new HashMap<String, String>() {{ put("fs.trash.interval", "400"); }});
c1.setVersionTag("version2");
c1.persist();
cluster.addConfig(c1);
configGroup = configGroupFactory.createNew(cluster, "g2",
"t2", "", new HashMap<String, Config>() {{ put("core-site", c1); }},
new HashMap<String, Host>() {{ put("h3", host); }});
configGroup.persist();
cluster.addConfigGroup(configGroup);