Scaling WebSockets: Handling Millions of Connections
Issue #92: System Design Interview Roadmap • Section 4: Scalability • July 7, 2025
📋 What We'll Master Today
Connection Capacity Engineering - Breaking the 10K connection ceiling per server
Intelligent Load Balancing - Sticky sessions with consistent hashing at scale
Cross-Server Broadcasting - Redis pub/sub for distributed message delivery
Production Hardening - Memory leak prevention and ghost connection cleanup
Complete Implementation - Build a Discord-scale WebSocket system from scratch