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52 3.2. BYPASSING PHASE TWO p1 a1 a2 a3 p2 e : 0, E : {2, . . . } prepare(0) no-promise(0,5) E : {6,8,...} e : 6, E : {8, . . . } prepare(6) promise(6,5,B) QP :{a1},emax :5,v:B promise(6,5,B) QP :{a1,a2} propose(6,B) accept(6) QP :{a1} accept(6) QP :{a1,a2} o:6 eacc :6 epro:6 epro:6 eacc :6 eacc :6 epro:5 eacc :5 vacc :B epro:5 eacc :5 vacc :B epro:5 eacc :5 vacc :B epr (6, B) decided Figure 3.1: Classic Paxos with NACKs (Alg. 5,6) 3.2 Bypassing phase two The proposer algorithm for Classic Paxos is doing more work then is strictly necessary to meet the requirements of distributed consensus. In practice, if a proposer learns that a value has already been decided, because a majority of acceptors return the same proposal during phase one, then the proposer may skip phase two and return the value in the proposal.PDF Image | Distributed consensus
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