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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) .
An eventual consistency [4] is a weak consistency model in a system with the lack of simultaneous updates. It defines that if no update takes a very long time, all replicas eventually become consistent.
The compare function is included to illustrate a partial order on the states. The merge function is commutative, associative, and idempotent. The update function monotonically increases the internal state according to the compare function. This is thus a correctly defined state-based CRDT and will provide strong eventual consistency.
If information is deleted in an eventually-consistent distributed data store, the "eventual" part of the eventual consistency causes the information to ooze through the node structure, where some nodes may be unavailable at time of deletion.
Strong versus eventual consistency (storage) [ edit ] In the context of scale-out data storage , scalability is defined as the maximum storage cluster size which guarantees full data consistency, meaning there is only ever one valid version of stored data in the whole cluster, independently from the number of redundant physical data copies.
I cannot imagine how ACID and BASE can possibly be considered mutually exclusive. ACID is about write operations on an individual server, BASE is about replication between at least 2 servers. You can achieve eventual consistency on a replication environment with a fully ACID-compliant DBMS. This is the most common situation.
Pages in category "Consistency models" The following 20 pages are in this category, out of 20 total. ... Eventual consistency; I. Indivisibility (programming) J. Java ...
Causal consistency is a useful consistency model because it matches programmers' intuitions about time, is more available than strong consistency models, yet provides more useful guarantees than eventual consistency.