[lern_too_spel]

Why do you need failover if you have global multimaster like Spanner?

[aliuy]

An interesting thing to point out is the current beta for Cloud Spanner does not have multi-region deployments... and instead, allows you to do single-region deployment in your choice of 3 (not >30) regions:

https://cloud.google.com/spanner/docs/instance-configuration