An architect’s breakdown: quorum DR, split-brain, leases — and why “wait for the standby” isn’t the same as “survive minority failures.” What Is Paxos Saying — and Why It Matters? If you’ve never bumped into distributed systems theory, Paxos might sound like an inside joke from a computer-science department. A useful mental model is a roomful of people trying to agree on one outcome — except some people arrive late, drop off the call, or contradict themselves. The system still has to produce a single decision that won’t unravel later. That is the problem distributed consensus exists to solve. The Paxos family of protocols, introduced by Turing Award winner Leslie Lamport, is a classic answer: no outcome is final unless a majority of participants has accepted it. Why a majority? Because the math is clean: if every decision requires a majority, then any two majorities must share at least one member.…