Design Studio — Design a Rate Limiter
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Requirements
Scale & non-functional
- 1M requests/sec across all API Gateway nodes
- Rate limit check adds < 5ms p99 latency to the request path
- 99.99% availability — a rate limiter outage must not block legitimate traffic
- Consistent enforcement across all gateway nodes (no per-node state drift)
- Limits must be adjustable at runtime without redeployment
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