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54 3.2. BYPASSING PHASE TWO Algorithm 7: Proposer algorithm for Classic Paxos with phase two bypass state : 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 • QV : set of acceptors who have promised with (emax, v) v,emax←nil QP,QA←∅ QV ←∅ e ← min(E ) E←E\{e} /* Start Phase 1 for epoch e */ send prepare( e) to acceptors while|QP|<⌊na/2⌋+1do switch do case promise( e,f,w) received from acceptor a QP ←QP ∪{a} if f ̸= nil then if emax =nil∨f >emax then QV ←{a} emax ← f, v ← w else if f = emax then QV ←QV ∪{a} case timeout goto line 1 if |QV|≥⌊na/2⌋+1then /* proposer has learned that (emax,v) is decided */ return v else if v = nil then v←γ /* Start Phase 2 for proposal (e,v) */ send propose( e,v) to acceptors while |QA| < ⌊na/2⌋ + 1 do switch do case accept( e) received from acceptor a QA ← QA ∪ {a} case timeout goto line 1 return vPDF Image | Distributed consensus
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