cluster用了 Sticky session以后进程之间事件通信失效了

照着 https://github.com/indutny/sticky-session这上面的例子写个测试代码

var cluster = require('cluster');  
var sticky = require('sticky-session');
const PORT=5000;
 
var totalReqs = 0;
var localReq = 0;

var server = require('http').createServer(function(req, res) {
      res.end(process.pid+ ' worker: ' + cluster.worker.id);
      process.send(" worker  " + process.pid + "  local is " + localReq + "  sum is " + totalReqs);
});

if (!sticky.listen(server, PORT)) {
  // Master code
 if (cluster.isMaster) {
	Object.keys(cluster.workers).forEach(function(i){
	    cluster.workers[i].on('message', function(msg) {
		    totalReqs++;
	            console.log(totalReqs);
	     });
	});
}
server.once('listening', function() {
    console.log('server started on  port',PORT);
  });
} else {
  // Worker code
console.log(process.pid);
}

sticky的效果实现了，但是master/woker进程之间事件通信没反应了