Pattern 46 / CONSENSUS
Use this when tuning consistency and availability in replicated systems.
Quorum fits when tuning consistency and availability in replicated systems. Mechanism: require enough replicas for reads and writes so quorums overlap. Use it for Dynamo/Cassandra-style stores and replicated consensus-adjacent designs. The toll: higher quorum counts increase latency and reduce availability during failures.
Dynamo/cassandra-style stores and replicated consensus-adjacent designs.
N=3, w=2, r=2 makes reads intersect the latest write.
Describe the pressure first, then the mechanism, then the cost. That keeps the design grounded.
Same pressure family