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6/18/2026
Redis sliding window rate limiter

Redis sliding window rate limiter

Original: Building a Sliding Window Rate Limiter in Redis for a Multi-Region Video API

Short summary

A production video API quota exhaustion problem revealed that fixed-window rate limiters leak traffic when requests cluster at boundary times. The solution uses Redis sorted sets with atomic Lua scripts to implement exact sliding-window rate tracking. The pattern is memory-efficient and language-agnostic, transferable to any backend with Redis support.

  • •Fixed-window rate limiters allow double-intended traffic when requests cluster at boundary transitions
  • •Sliding-window logs with Redis sorted sets and Lua atomicity provide exact rate limiting
  • •Pattern trades minimal per-request memory overhead (~100 bytes) for perfect quota precision

Generated with AI, which can make mistakes.

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