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Paxos system, and distributed key-value store

This repository has three examples.

• A Paxos system that comes to consensus on proposals for the final value of a unique key. The system comprises instances of an event-sourced Paxos application class, each of which have an event-sourced Paxos aggregate that has an instance of the Paxos protocol. Proposing a value for a key starts a Paxos aggregate, which announces Paxos messages as domain events. The domain events are processed by the other applications in the system, by receiving them into Paxos aggregates, leading to further messages being announced that are processed by the other applications. Eventually, consensus is reached across the system.

• A replicated state machine that extends the Paxos system, and comes to consensus on an ordered sequence of proposed commands, each of which is executed in the same order on each replica.

• A distributed key-value system that extends the replicated state machine application by supplying a set of key-value commands that can be proposed and executed, and key-value aggregates that evolve according to those commands. Keys can be created, read, updated, deleted, and renamed.