Google Drive: A Beginner's Guide to Paxos

The code ideas of Paxos protocol: 1) Optimistic concurrency control (variant 2). Hold a "preemptible lock" first, try updating, restart on denial; 2) Quorum as a logical unit of acceptor for choose operation. A value is chosen iff it's accepted by a quorum, which implies from the proposer's perspective the choose operation is atomic, it's all or nothing, it's either accepted by a quorum or it isn't.

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