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Real-time Chat System
A real-time chat system facilitates instant messaging between users. It uses persistent connections (like WebSockets) to deliver messages with low latency. The architecture must be highly scalable to support millions of concurrent connections and messages per second.
Key Components
WebSocket Server
Load Balancer
User Presence Service
Message History Database (Cassandra)
Cache (Redis)
Notification Service
Design Challenge
Maintaining massive persistent connections and ensuring low-latency message delivery without dropping messages.