I Built a Consistent Hashing Ring in Pure Python and Finally Understood How Cassandra Distributes Data

I Built a Consistent Hashing Ring in Pure Python and Finally Understood How Cassandra Distributes Data I've been using Cassandra and Redis Cluster for years. I knew consistent hashing was "how they work." But I never truly got it until I built one myself from scratch, in pure Python, with zero dependencies. This post is about what I learned doing that. The Problem Consistent Hashing Solves Imagine you have 3 servers and 1 million keys. The naive approach: server = hash(key) % 3 . It works great