Design Studio — Design a Chat System
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Requirements
Scale & non-functional
- 50B messages per day ≈ 580,000 messages/sec at peak
- 500M daily active users, each with ~10 open connections
- Message delivery latency < 100ms for online recipients
- Messages must be durable — never lost after the server acknowledges receipt
- 99.99% availability — users notice immediately if chat is down
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