Joseph Doherty e0f5fe7150 feat(raft): implement joint consensus for safe two-phase membership changes ...

Adds BeginJointConsensus, CommitJointConsensus, and CalculateJointQuorum to
RaftNode per Raft paper Section 4. During a joint configuration transition
quorum requires majority from BOTH Cold and Cnew; CommitJointConsensus
finalizes Cnew as the sole active configuration. The existing single-phase
ProposeAddPeerAsync/ProposeRemovePeerAsync are unchanged. Includes 16 new
tests covering flag behaviour, quorum boundaries, idempotent commit, and
backward-compatibility with the existing membership API.

2026-02-25 01:40:56 -05:00

9.8 KiB

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