AFAIK only spanner uses real time as a core primitive. They don't use ntp ;-)
Monotonic sequence numbers loosely based on real time are common, since you can correlate the sequence number back to an actual time to look at logs, etc. Time skew wouldn't break the protocol, just make it annoying to correlate after the fact.
And of course any leasing system uses bounded clock skew rate between hosts, but NOT bounded absolute skew.
Monotonic sequence numbers loosely based on real time are common, since you can correlate the sequence number back to an actual time to look at logs, etc. Time skew wouldn't break the protocol, just make it annoying to correlate after the fact.
And of course any leasing system uses bounded clock skew rate between hosts, but NOT bounded absolute skew.