Socket.IO and Node.js Core Cluster

Question

Is it possible to use Socket.IO with Node's core cluster (not the outdated module)? I can fork multiple workers and it seems to work fine; however, when opening a connection I get the error: `solve: warn - client not handshaken client should reconnect` Here's the relevant code snippet (with a few simple things like expressjs config removed): ``` if ( cluster.isMaster ) { for ( var i = 0; i < numCPUs; i++ ) { cluster.fork(); } } else { app.get('/', function (req, res) { res.sendfile( __dirname + '/public/html/index.html' ); }); io.configure( function() { var RedisStore = require('socket.io').RedisStore, opts = { host: 'localhost', port: 8888 }; io.set('store', new RedisStore( { redisPub: opts, redisSub: opts, redisClient: opts } )); }); app.listen( 8888 ); io.sockets.on('connection', function (socket) { socket.emit( 'some', 'data' ); }); } ``` I've tried with and without using RedisStore and with the trick on this site (which I believe is obsolete now): http://www.danielbaulig.de/socke…

Accepted Answer

It seems the issue may be related to the node module that Socket.IO comes installed with.

When I installed redis (`npm install hiredis redis`) and created the clients for the RedisStore using the redis module, everything suddenly worked perfectly. I've been running for over an hour with ~500 concurrent connections and haven't seen a single error, and every node process is being utilized.

hiredis@0.1.14 redis@0.7.2

Running Redis 2.6rc3 on port 6379.

Update: In Node.s 0.8, it looks like the cluster library should be considerably more mature, so the above code/issues will probably become obsolete: http://nodejs.org/docs/v0.7.8/api/cluster.html

Socket.IO and Node.js Core Cluster

Solution

Problem