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Which Agreement Protocol Agrees On A Vector Of Values

Real-world applications that often require consensus include cloud computing, clock synchronization, PageRank, opinion formation, smart grids, health estimation, drone control (and multiple robots/agents in general), load balancing, blockchain, and others. Another implementation of concurrent objects is called a no-wait implementation, which can ensure consensus in a finite number of steps. Is a certain type of object strong enough to solve consensus problems? Maurice Herlihy gave a “hierarchy of impossibility and universality”. [38] Google has set up a library of distributed locking services called Chubby. [15] Chubby manages lock information in small files stored in a replicated database for high availability in the event of a failure. The database is implemented on a fault-tolerant protocol layer based on the Paxos consensus algorithm. In this diagram, Chubby clients communicate with the Paxos master to access/update the replicated protocol. i.e. read/write to files. [16] There are two types of errors that a process can go through, a crash error or a Byzantine error. A crash error occurs when a process terminates abruptly and does not continue. Byzantine chess is failure in which absolutely no conditions are imposed. For example, they can occur as a result of malicious actions of an adversary.

A process where a Byzantine error occurs can send contradictory or conflicting data to other processes, or it can go to sleep and then resume activity after an extended delay. Of the two types of chess, Byzantine chess is much more troubling…