docs: function MultiserverWorker(servers, func_name, callback, options) {
    var that = this;
    options = options || {};
    Multiserver.call(this, servers, function(server, index) {
      return new gearman.Worker(func_name, function(payload, worker) {
        that._debug('received job from', that._serverString(index));
        return callback(payload, worker);
      }, {
        host: server.host,
        port: server.port,
        debug: options.debug || false
      });
    }, Multiserver.component_prefix(options.component_name) + 'worker');
  }