Data Systems
coordination service
ZooKeeper/etcd, consensus-as-a-service
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Consistency and ConsensusData SystemsMore terms from this board
- 2PCtwo-phase commit (prepare → commit); BLOCKING if coordinator dies
- causal consistencypreserve cause→effect order, cheaply
- consensusnodes agree on one value (agreement/integrity/validity/termination)
- coordinator/participantthe 2PC roles
- FLPno async consensus can always terminate with 1 crash
- Lamport timestampa counter giving causal total order
- linearizabilityact like one copy, reads always see the latest write (recency)
- partial vs total ordersome-events-unordered vs one-timeline
- Paxos/Raft/Zabconsensus algorithms
- strict serializabilitylinearizable + serializable
- total order broadcastsame-order delivery to all = a replicated log = consensus