Google 把 Cloud Spanner 這個服務拿出來賣了：「Introducing Cloud Spanner: a global database service for mission-critical applications」，以及說明的「Inside Cloud Spanner and the CAP Theorem」。
Cloud Spanner 的規劃上是希望有 RDBMS 的能力 (像是 ACID 特性)，又有強大的擴充能力 (scalability) 與可用性 (availability)：
Today, we’re excited to announce the public beta for Cloud Spanner, a globally distributed relational database service that lets customers have their cake and eat it too: ACID transactions and SQL semantics, without giving up horizontal scaling and high availability.
在說明裡有提到 Cloud Spanner 是做到 CAP theorem 裡面的 CP：
The purist answer is “no” because partitions can happen and in fact have happened at Google, and during some partitions, Spanner chooses C and forfeits A. It is technically a CP system.
然後把 A 拉高到使用者不會在意 downtime 的程度：
However, no system provides 100% availability, so the pragmatic question is whether or not Spanner delivers availability that is so high that most users don't worry about its outages.
當然，比較讓人爭議的是 Twitter 上 Google Cloud 官方帳號的 tweet，直接講同時解決了 CAP 三個條件：
Cloud Spanner: the first horizontally scalable, globally consistent, relational database service https://t.co/QpXuTk9q6s
C✔️️
A✔️️
P✔️️ pic.twitter.com/UvziIKz1Y3— Google Cloud (@googlecloud) February 14, 2017
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