skill-arch-realtime

Scaling WebSocket connections across multiple servers requires cross-server messaging using Redis adapters, Redis Streams, or Kafka to broadcast events and maintain consistent presence and targeted broadcasts.

Real-time presence and room management in chat applications use WebSocket-based communication patterns with room and user presence tracking to ensure reliable targeted broadcasts and typing indicators.

You need a Redis adapter for Socket.io cross-server signaling when broadcasting events across multiple server instances to maintain consistent state for real-time updates like live dashboards or multiplayer games.

Server-Sent Events and long-polling serve as fallback transports for real-time websockets, ensuring broader compatibility and reliable low-latency updates when WebSocket connections are unavailable.

This real-time architecture supports low-latency broadcasts across multiple servers and includes push notification integration, making it suitable for chat, live dashboards, and multiplayer games.

While pubsub enables cross-server real-time messaging, it may not guarantee message delivery ordering during high-throughput scaling; Redis Streams offer more persistent alternatives for reliable event broadcasting.