Eventual consistency

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Eventual consistency is a consistency model used in distributed computing to achieve high availability. An eventually consistent system ensures that if no new updates are made to a given data item, eventually all read accesses to that item will return the last updated value. Eventual consistency, also called optimistic replication, is widely deployed in distributed systems and has origins in early mobile computing projects. A system that has achieved eventual consistency is said to have converged, or achieved replica convergence. Eventual consistency is a weak guarantee – most stronger models, like linearizability, are trivially eventually consistent. Eventually-consistent services are often classified as providing BASE semantics (basically-available, soft-state, eventual consistency), in contrast to traditional ACID (atomicity, consistency, isolation, durability). The rough definitions of each term in BASE are: Basically available: it is the database's concurrent accessibility by users...

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