code: static String getRemoteNamenodeHttpName(Configuration conf, 
        InstanceId instance) 
      throws IOException {
      if (instance == InstanceId.NODEZERO) {
        return conf.get("dfs.http.address1");
      } else if (instance == InstanceId.NODEONE) {
        return conf.get("dfs.http.address0");
      } else {
        throw new IOException("Unknown instance " + instance);
      }
    }
docs: Returns the name of the http server of the local namenode