public static synchronized void init() {
    if (initialized) {
      LOG.info("FastProtocolHDFS already initialized");
      return;
    }

    // enumerate all FastProtocol classes for hdfs, and force
    // initialization
    JournalNodeRpcServer.init();

    // initialization is only done once
    initialized = true;
    LOG.info("FastProtocolHDFS initialization complete.");
  }