Hello,

I would like to know up to how many nodes max we can run a distributed app with a simple libray like libcluster ?

I read somewhere that after 40/50 nodes, you can start having issues like loss of messages and it generally does not scale well above that number.

For the context:

I’m currently building an app with an expectation of 2/3 millions concurrent users.
Those users would spread around 300 000 + channels.
So each channel would contain something like 100 users or less joining and they would mostly exchange chat messages.

Phoenix Presence is set up on those channels so an user can be aware at anytime of whose connected.

I heard about an Erlang library called Partisan that is used for very large cluster, but I guess for my use cases lib cluster should be enough ?

If anyone has been working in a distributed app it would be nice to share your feedback here.

Cheers.