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When the node leaves, only the keys it owned hop to their successor — the rest of the ring is undisturbed.
More about this scenario
You'll learn
How consistent hashing keeps a cluster reshardable — a membership change moves only a fraction of keys, not all of them.
How it runs
Each node (and its virtual nodes) hashes to points on a ring; a key belongs to the first node clockwise from its hash. Removing a node hands only its keys to the next node clockwise; every other key keeps its owner.