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While everyone is puzzling over how Spanner seems to be claiming to be CA, I would like to take this opportunity to bring up PACELC[1]. The idea is that the A-

While everyone is puzzling over how Spanner seems to be claiming to be CA, I would like to take this opportunity to bring up PACELC[1]. The idea is that the A-or-C choice in CAP only applies during network partitions, so it's not sufficient to describe a distributed system as either CP or AP. When the network is fine, the choice is between low latency and consistency. In the case of Spanner, it chooses consistency over availability during network partitions, and consistency over low latency in the absence of partitions. 1: http://cs-www.cs.yale.edu/homes/dna/papers/abadi-pacelc.pdf http://cs-www.cs.yale.edu/homes/dna/papers/abadi-pacelc.pdf

meddlepal 10y ago
It's not claiming CA. It's claiming CP with A strongly implied thanks to a massive amount of Google engineering and private networking. https://cloudplatform.googleblog.com/2017/02/inside-Cloud-Spanner-and-the-CAP-Theorem.html https://cloudplatform.googleblog.com/2017/02/inside-Cloud-Sp...
- elvinyung 10y ago
  I said "seems to", since a lot of people seem to think it :P
- zzzcpan 10y ago
  I think A is wrongly implied, tried to explain it here: https://news.ycombinator.com/item?id=13645925 https://news.ycombinator.com/item?id=13645925
deleted 10y ago
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