How We Built Rate Limiting Capable of Scaling to Millions of Domains.¶
Cloudflare. (2017). How We Built Rate Limiting Capable of Scaling to Millions of Domains.
Cited by¶
1 citation across 1 artifact.
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Primes¶
- Rate Limiting
- The fixed-window alternative exhibits a flaw the formalism exposes: an actor spending the full budget at the end of one window and the start of the next achieves twice the nominal rate at the boundary — the edge effect that motivates sliding windows.
This sourceDocuments the fixed-window boundary/edge effect (a burst straddling a window reset can double the effective rate) and the sliding-window-counter approximation introduced to fix it.
Supported in partVerified against the work's full text
Cloudflare says fixed-window counters let regular traffic spikes through at resets and that its sliding-window counter smooths this, but it never says the burst reaches twice the rate.
“This works but is not terribly accurate as the counter will be arbitrarily reset at regular intervals, allowing regular traffic spikes to go through the rate limiter.”
- The fixed-window alternative exhibits a flaw the formalism exposes: an actor spending the full budget at the end of one window and the start of the next achieves twice the nominal rate at the boundary — the edge effect that motivates sliding windows.
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