code: function handleWorkerRestart(worker, code, signal) {
  		delete self.workers[worker.id];
  		if (self.reviveWorkers) {
  			var zombie = cluster.fork({
  				config: JSON.stringify(self.config)
  			});
  			self.workers[zombie.id] = zombie;
  		}
  	}
docs: Restart a worker when one goes offline