socket.io cluster with sticky-session problems

[hussion]

Recently, i do the socket.io stress test, what make me confused is socket.io use one cpu can support more than 20k connections, but use cluster modle with stikcy-session, it only can support 4k connections. Can someone explain this is what causes it ? help me please !

At last, i hope socket.io can provide a affcial example with cluster. thx. :)

[peteruithoven]

That might be because then it needs to communicate between multiple instances, using redis pub sub.
This pull request should help with that: socketio/socket.io-redis-adapter#46
Looks like the author also added a small performance test.

[hussion]

@peteruithoven you mean: i need use multiple instances and not use cluster ?

[peteruithoven]

When you use clusters you in effect also use multiple instances. Maybe you need to read a little bit more before you start asking for help.

[hussion]

@peteruithoven First of all want to thank you very much, now my question is I said above , I use a cpu core test (one instance), they can support the 20k number of connections, but I used the cluster mode, but only supports 4k connections , Why do I use the cluster with sticky-session after a drop in performance so much ? you understand I mean?

[peteruithoven]

I think I understand you. Please at least read the pull request #46
socketio/socket.io-redis-adapter#46 description
and socket.io-redis
issue #41 socketio/socket.io-redis-adapter#41.

On Thu, Jan 15, 2015 at 11:00 AM, hussion notifications@github.com wrote:

@peteruithoven https://github.com/peteruithoven First of all want to
thank you very much, now my question is I said above , I use a cpu core
test (one instance), they can support the 20k number of connections, but I
used the cluster mode, but only supports 4k connections , Why do I use the
cluster with sticky-session after a drop in performance so much ? you
understand I mean?

—
Reply to this email directly or view it on GitHub
#1944 (comment)
.

[hussion]

@peteruithoven oh my friend, what important is i think i should let you know: I did NOT USE "socket.io-redis" , i am now just test how many connections the socket.io server can support.

so now you understand ?

[ebuildy]

I think it's normal because sticky session make your socket.io servers communicate with each others.

[darrachequesne]

That issue was closed automatically. Please check if your issue is fixed with the latest release, and reopen if needed (with a fiddle reproducing the issue if possible).