但價錢唔算親民🙈 要夾 GPS clock 做 Time Synchronization ，唔夾番幾隻人造衛星都應該實踐唔到...
From Wiki,
Described as a NewSQL platform, Spanner is used internally within Google's infrastructure as part of the Google platform.
Spanner uses the Paxos algorithm as part of its operation to shard data across hundreds of datacenters.
It makes heavy use of hardware-assisted time synchronization using GPS clocks and atomic clocks to ensure global consistency.
