The bigger issue is that you need Google's incredible inter-DC networking, which in practice makes partitions very rare. Eric Brewer (author of CAP theorem) lay

The bigger issue is that you need Google's incredible inter-DC networking, which in practice makes partitions very rare. Eric Brewer (author of CAP theorem) lays out here [0] how Spanner relies on those networking guarantees to be effectively CA. Google's inter-dc traffic flows entirely on private links rather than on the public internet, which is very hard for any other company to match on a global scale. [0] https://static.googleusercontent.com/media/research.google.com/en//pubs/archive/45855.pdf https://static.googleusercontent.com/media/research.google.c...