Distributed systems. Consensus [0], CAP, PACELC theorems [1], CRDTs [2], maybe Chord DHT [3] for hash rings. Oh, and jepsen.io for actual database choices. [

Distributed systems. Consensus [0], CAP, PACELC theorems [1], CRDTs [2], maybe Chord DHT [3] for hash rings. Oh, and jepsen.io for actual database choices. [0] https://en.wikipedia.org/wiki/Consensus_(computer_science) https://en.wikipedia.org/wiki/Consensus_(computer_science) [1] https://en.wikipedia.org/wiki/PACELC_theorem https://en.wikipedia.org/wiki/PACELC_theorem [2] https://en.wikipedia.org/wiki/Conflict-free_replicated_data_type https://en.wikipedia.org/wiki/Conflict-free_replicated_data_... [3] https://en.wikipedia.org/wiki/Chord_(peer-to-peer) https://en.wikipedia.org/wiki/Chord_(peer-to-peer)