consensus

RU: консенсус

A distributed-systems problem in which a cluster of nodes must agree on a single value despite node failures and network delays. A correct consensus protocol satisfies three properties: agreement (all non-faulty nodes decide the same value), validity (the decided value was proposed by some node), and termination (every non-faulty node eventually decides). Algorithms such as Raft and Paxos solve consensus for crash-fault models and are the foundation of replicated state machines.