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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) .
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.
The processor consistency model (PC) is the most relaxed of the three models and relaxes both the constraints such that a read can complete before an earlier write even before it is made visible to other processors. In Example A, the result is possible only in IBM 370 because read(A) is not issued until the write(A) in that processor is completed.
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.
After years of consistency as one of the best kickers in the league, Tucker finally looked human this year, making a career-low 73.3% of field-goal attempts and securing fewer than 26 field goals ...
SimpleDB provides eventual consistency, which is a weaker form of consistency, compared to other database management systems. This is often considered a limitation, because it is harder to reason about, which makes it harder to write correct programs that make use of SimpleDB. This limitation is the result of a fundamental design trade-off.
The average preseason rank of the past 20 eventual national champions has been 9.5. Those soon-to-be national champions have an average ranking of 5.6 in the final AP poll before the NCAA ...