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That's what Google spanner is claiming, that Spanner is Consistent and highly-Available (nine fives, or 99.99999% of the time available), which "in practice" t
by lucio 8y ago
That's what Google spanner is claiming, that Spanner is Consistent and highly-Available (nine fives, or 99.99999% of the time available), which "in practice" they say is "CA".
- teraflop 8y agoFrom the perspective of the CAP theorem, Spanner is unquestionably a CP system, as the original paper [1] makes clear. (It relies on Paxos to elect leaders, and Paxos chooses consistency over availability.) The "CA in practice" claims are purely marketing. [1]: https://storage.googleapis.com/pub-tools-public-publication-data/pdf/39966.pdf https://storage.googleapis.com/pub-tools-public-publication-...