Are you tired of server segregation limiting real-time communication among colleagues? I faced a similar challenge, but I found a solution. By introducing a Pub/Sub architecture with the help of Redis, I was able to enable seamless communication between users across different server environments. This approach enhances scalability, distributing the messaging load and enabling horizontal scaling across servers. Say goodbye to server limitations and hello to increased efficiency with Pub/Sub architecture.

Users A, B, and C on Server 1 can chat in Socket.io, but User D on Server 2 cannot because of server segregation. Socket.io design limits communication within servers, preventing User A from accessing User D. Each server runs independently, controlling connections inside its own server. As a result, User A and User D remain separated, unable to communicate across server borders despite their common desire for engagement.

Introducing a Pub/Sub architecture bridges the gap between servers, enabling communication between User A on Server 1 and User D on Server 2. By employing a broker like Redis, messages can be published by one server and subscribed to by the other, facilitating seamless interaction. This approach enhances scalability by distributing the messaging load and enabling horizontal scaling across servers. Thus, Pub/Sub architecture acts as the conduit for inter-server communication, fostering connectivity between users across different server environments, ultimately enhancing the scalability and efficiency of the chat application.