node@0.12.x udp and pm2

[skoranga]

Hi
Looks like pm2 is acting very weird on node@0.12.x when used in cluster mode. On hitting the udp code twice pm2 is orphaning the node process and going stall. This works perfectly fine on plain node.

Created this example to show the issue - https://github.com/skoranga/testudpapp

Any idea what's going on?

-sanjeev

[jshkurti]

Bug confirmed.
It looks like it comes from Node.js itself.
nodejs/node-v0.x-archive#9261

[jshkurti]

Thanks for reporting this, I'm going to try to find a workaround.

[jshkurti]

And it was fixed in joyent/node#v0.12 (https://github.com/joyent/node/pull/8643/files) but it will take a while till it's published.
We can't really do anything about it for now in PM2 :/

Here is a workaround given by one of the Node.js contributors :

var cluster = require('cluster');
var http = require('http');
var dgram = require('dgram');
var numCPUs = require('os').cpus().length;

if (cluster.isMaster) {
  // Fork workers.
  for (var i = 0; i < numCPUs; i++) {
    cluster.fork();
  }

} else {

  var server = http.createServer(function (request, response) {
    var client = dgram.createSocket("udp4");

    client.bind({exclusive: true}, function() {
      var message = new Buffer("Hello");
      client.send(message, 0, message.length, 80, "google.com", function(err, bytes) {
        client.close();
      });
      response.writeHead(200, {"Content-Type": "text/plain"});
      response.end("Hello World\n");
    });
  });

  server.listen(1337);
}

Important part : client.bind({exclusive: true}

[skoranga]

thanks, the workaround works. 👍