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CHAPTER 6. VALUE SELECTION REVISED 111 6.3 Summary Classic Paxos (and our revisions) require that, after receiving sufficient promises to satisfy the quorum intersection requirement, the proposer proposes the value associated with the greatest epoch received or its own candidate value if no such values are received. We proved that by tracking the status of each quorum, proposers can utilise additional promises to remove the requirement that a particular value is proposed in phase two. In this case, the proposer may propose its own candidate value or any previously seen value. Quorum-based value selection generalises over Classic Paxos’s value selection rules. The original rules are a quick and safe approximation of the more complete quorum-based rules. This relationship is analogous to that of Classic Paxos’s quorum intersection requirement and Paxos version B requirement.PDF Image | Distributed consensus
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