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Distributed consensus

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Distributed consensus ( distributed-consensus )

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CHAPTER 4. QUORUM INTERSECTION REVISED 85 p1 a1 a2 a3 p2 epro:1 eacc :1 vacc :B epro:1 eacc :1 vacc :B epro:1 eacc :1 vacc :B e : 0, E : {2, . . . } propose(0,A) timeout e : 2, E : {4, . . . } prepare(2) promise(2,1,B) QP : {a1}, emax:0 v:B promise(2,1,B) QP :{a1,a2} propose(2,B) accept(2) QA : {a1} accept(2) QA :{a1,a2} o:2 eacc :2 epro:2 epro:2 eacc :2 eacc :2 epr (2, B) decided Figure 4.4: Example of a proposer proposing a value different to the decided value, after the commit point has been reached. then we can reduce the phase one quorum depending on the epoch. 4.3 Implications Thus far we have weakened the quorum intersection requirement of Paxos and discussed the implications for Classic Paxos, as described in Chapter 2. In this section, we will explore the implication of our revised understanding of consensus on the known variants of Paxos, as surveyed in Chapter 3.

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