WebSocket Scalability Is a Distributed State Problem

After years of designing and building distributed real-time architectures, one thing became clear: WebSocket scalability is a distributed state management problem, not a networking problem.

In a distributed WebSocket architecture, every gateway becomes only a partial view of the system.

No single gateway knows:

Every active connection
Every room membership

Without a shared state layer, each gateway operates in isolation.

That's why production-scale WebSocket architectures separate three core responsibilities:

Local memory connection state inside each WebSocket gateway.
Redis Adapter for distributed events propagation.
A Distributed Connection Registry for global connection registry.

That's how production real-time systems scale.

Scale the state, not the gateways.