This post discusses the challenges of scaling WebSockets for large-scale communication with persistent connections and provides possible solutions.

It explores the Go ecosystem for WebSockets, optimized buffer allocations, and the use of EPoll to reduce memory utilization. It also covers the need for synchronous communication and explains how it can be achieved using message UUIDs and channels in Go, as well as how to horizontally scale the system using AWS ASG, Route53 DNS, and a server registry built on top of MySQL.

With the right architectural design and implementation, WebSockets can be scaled efficiently, resulting in real-time communication at a multi-million scale.