4 / 7 Consensus: Raft, Paxos & Leader Election

What Majorities Buy You

Which of these statements about majority quorum consensus are true? Select all that apply.

A

A six node cluster tolerates the same failures as a five node cluster, so the extra member buys durability not availability

B

A leader that holds the highest term can commit entries by itself, since no other node in the cluster is able to outrank it

C

Any two majorities of the same member set share a node, which is why a new leader sees what the previous one committed

D

Raft never commits conflicting entries under delay, reordering or duplication, but it can stop progressing during a partition

E

Adding members raises write throughput, because more replicas are able to acknowledge each entry in parallel with one another