Design StudioDesign 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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