Cassandra - The Definitive Guide 2e by Jeff Carpenter Eben Hewitt

Author:Jeff Carpenter, Eben Hewitt
Language: eng
Format: epub
Publisher: O'Reilly Media, Inc.
Published: 2015-12-16T16:00:00+00:00

An updated perspective on CAP

Eric Brewer provided an updated perspective on his CAP theorem in a February 2012 article in IEEE Computer, which has also been made available at: http://www.infoq.com/articles/cap-twelve-years-later-how-the-rules-have-changed. Brewer now describes the “2 out of 3” axiom as somewhat misleading. He notes that designers only need sacrifice consistency or availability in the presence of partitions, and that advances in partition recovery techniques have made it possible for designers to achieve high levels of both consistency and availability.

These advances in partition recovery certainly would include Cassandra’s usage of mechanisms such as hinted handoff and read repair. We’ll explore these in [Link to Come]. However, it is important to recognize that these partition recovery mechanisms are not infallible. There is still immense value in Cassandra’s tuneable consistency, allowing Cassandra to function effectively in a diverse set of deployments in which it is not possible to completely prevent partitions.

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