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Consistent Hashing — Why "hash % N" Fails at Scale

This story is from 2026-09-16. It is preserved in the archive; the latest stories are on the live feed.

Facebook had 1000+ Memcached servers. They added one more. Billions of cache entries got invalidated at once. Thundering herd. Database crushed. Partial outage. They switched to consistent hashing. Problem solved. Here's the thing: every time you say "let's distribute data across N servers" in a sy…

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  1. 2026-09-16 18:08 · DEV Community — AI
    Consistent Hashing — Why "hash % N" Fails at Scale

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