Scaling Primitives
Consistent hashing
Lesson 3 of 5
Consistent hashing keeps key-to-node mapping stable across cluster changes, remapping only a 1/N slice instead of everything.
What you'll learn
- See why naive hash % N reshuffles almost every key when N changes
- Explain the hash ring and how virtual nodes fix load balance
- Connect it to real sharding, distributed caches, and CDNs
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