I Built Consistent Hashing From Scratch in Go — Here's What I Learned

If you've ever added a server to a cache cluster and watched your database melt, you already know the problem consistent hashing solves. You just might not know it by name. I built a full implementation from scratch in Go to understand it deeply. This post walks through what I learned — the problem, the fix, and the gotchas nobody tells you about. The five-minute version You have 5 cache servers. You route keys with hash(key) % 5. Life is good. Then traffic spikes and you add a 6