code: protected void initializeRpcCollector(Configuration conf) throws IOException {
      rpcCollector =
            (UtilizationCollectorProtocol) RPC.getProxy(UtilizationCollectorProtocol.class,
                                             UtilizationCollectorProtocol.versionID,
                                             UtilizationCollector.getAddress(conf),
                                             conf);
    }
docs: Create the the {@link UtilizationCollectorProtocol} RPC object
  @param conf Configuration
  @throws IOException