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Consus is a strictly serializable geo-replicated transactional key-value store. The key contribution of Consus is a new commit protocol that reduces the cost of executing a transaction to three wide area message delays in the common case. Augmenting the commit protocol are multiple Paxos implementations optimized for different purposes. Together the different implementations and optimizations comprise a cohesive system that provides low latency, high availability, and strong guarantees. This paper describes the techniques implemented in the open source release of Consus, and lays the groundwork for evaluating Consus once the system implementation is sufficiently robust for a thorough evaluation. |
