docs: function MultiserverClient(servers, options) {
    options = options || {};
    Multiserver.call(this, servers, function(server) {
      return new gearman.Client({
        host: server.host,
        port: server.port,
        debug: options.debug || false
      });
    }, Multiserver.component_prefix(options.component_name) + 'client');
    this._rr_index = -1;    // round robin index
  }