code: void saveNamespace(boolean force, boolean uncompressed)
    throws AccessControlException, IOException {
      try {
        if (namenodeProtocolProxy == null) {
          versionBasedSaveNamespace(force, uncompressed);
        } else {
          methodBasedSaveNamespace(force, uncompressed);
        }
      } catch(RemoteException re) {
        throw re.unwrapRemoteException(AccessControlException.class);
      }
    }
docs: Save namespace image.
  See {@link ClientProtocol#saveNamespace()}
  for more details.
  
  @see ClientProtocol#saveNamespace()