code: private static GetConfigurationPResponse loadConfiguration(InetSocketAddress address,
        AlluxioConfiguration conf) throws AlluxioStatusException {
      GrpcChannel channel = null;
      try {
        LOG.info("Alluxio client (version {}) is trying to load configuration from meta master {}",
            RuntimeConstants.VERSION, address);
        channel = GrpcChannelBuilder.newBuilder(new GrpcServerAddress(address), conf)
            .disableAuthentication().build();
        MetaMasterConfigurationServiceGrpc.MetaMasterConfigurationServiceBlockingStub client =
            MetaMasterConfigurationServiceGrpc.newBlockingStub(channel);
        GetConfigurationPResponse response = client.getConfiguration(
            GetConfigurationPOptions.newBuilder().setRawValue(true).build());
        LOG.info("Alluxio client has loaded configuration from meta master {}", address);
        return response;
      } catch (io.grpc.StatusRuntimeException e) {
        throw new UnavailableException(String.format(
            "Failed to handshake with master %s to load cluster default configuration values: %s",
            address, e.getMessage()), e);
      } catch (UnauthenticatedException e) {
        throw new RuntimeException(String.format(
            "Received authentication exception during boot-strap connect with host:%s", address),
            e);
      } finally {
        if (channel != null) {
          channel.shutdown();
        }
      }
    }
docs: Loads configuration from meta master.
  
  @param address the meta master address
  @return the RPC response