Architecture of Paxos-MIC Sample Clauses

Architecture of Paxos-MIC. 4.3.1 Interaction with external proposers and learners We consider an open distributed system where nodes, called external Proposers/Learners and denoted PLextk, interact with a finite set of n nodes whose mission is to deliver a unique sequence of decision values by executing the Paxos-MIC agreement protocol. External pro- posers and learners are not involved in the convergence mechanism that is only driven by the interactions between the set of n nodes. An external proposer/learner PLextk participates to a consensus instance by identi- fying it with a sequence number called the consensus number and denoted c. For each value of c such that c ≥ 1, we assume that at least one correct node PLextkc calls the function Propose(c,vkc ). In doing so, this node suggests an initial value vkc that is likely to be the de- cided value determined at the end of consensus c. Without loss of generality, we assume that a node that provides an initial value during consensus c is implicitly interested in knowing the corresponding decision: therefore it must receive a Decision message that contains this decision value (denoted < v, c >). The Paxos-MIC protocol manages the complete series of consensus and not just a single consensus instance. More precisely, it begins by running an initial consensus that is numbered 1. Once the first decision is obtained, the protocol continues its execution and starts immediately the next consensus instance numbered 2 and so on. Assuming that c is the number of the current consensus instance, the protocol can converge toward a new deci- sion value < vx, c > because at least one correct participant calls the function Propose(vy,c)2. In the Paxos-MIC protocol, an external entity does not have to know the consensus number corresponding to the last reached decision. As the protocol is responsible for archiving all decisions adopted in the past, a call to the function Propose(vk,ca) done by a participant that is unaware of being behind (i.e., ca < c) will receive back a stored decision value. On the con- trary the initial value proposed by a participant that is either synchronized or ahead may be used during the current consensus (when ca = c) or is stored to be used later (when ca > c). While the consensus number managed within the Paxos-MIC protocol is incremented by 1 after each decision, an external entity can execute calls in a random order (knowing that any proposed value can potentially become a decision value). At any time, the number of c...
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