4 ms·

It’s called Spanner and TrueTime. Their docs are a good read: https://cloud.google.com/spanner/docs/true-time-external-consistency https://cloud.google.com/span

• agency 5y ago
  This is nice if you can afford to have atomic clocks in your data centers and whole infrastructure teams working on keeping your clocks in sync (read: if you are Google) but otherwise you're probably gonna have a bad time.
  • vlovich123 5y ago
    I think those clocks are coming down in price but the bigger challenge is the logistics - for whatever reason shared data centers don’t run in a GPS signal from the outside that all their clients can share.
    • infogulch 5y ago
      Well within the price range of smaller data centers, ~$1500 to build the open source reference card published by the open compute project: Open Time Server http://www.opentimeserver.com/ http://www.opentimeserver.com/
      • vlovich123 5y ago
        $1500 should be nothing, even to small data centers.