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Algorithms · hard

2. Consistent Hashing

Distributed caching and node ring topologies.

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Consistent Hashing maps keys and cache nodes to a virtual hash ring (0 to 2^32 - 1). When a node is added or removed, only `K / N` keys need to be remapped on average (using virtual nodes to balance load distribution).

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1. Why is Consistent Hashing used in distributed caches like DynamoDB and Memcached?
Minimizes key remapping when nodes are added or removed from the clusterEncrypts all stored keysRuns queries faster than SQLAvoids using RAM

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