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Henry Robinson
This paper that improves clock synchronization accuracy to tens of nanoseconds is amazing work. What changes with that level of accuracy? Like the paper says, Spanner commit times get a lot shorter. But is it now safe to take action without coordination?
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Henry Robinson 23. sij
Odgovor korisniku/ci @HenryR
One of the classic examples is leader failover: when is it safe for a replica to start serving? We only have to wait to be sure the original leader had realised it’s stopped getting heartbeats. So theoretically a tighter clock sync makes that wait time shorter. But...
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Henry Robinson 23. sij
Odgovor korisniku/ci @HenryR
my guess is that other factors, like scheduling delays, dominate in this case and contribute to potentially significant variance before a leader realizes what’s up. Putting the clock check on the critical path mitigates this at the expense of lots of clock checks.
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☭🐇 23. sij
Odgovor korisniku/ci @HenryR
henry is this a rhetorical question or...? do I need to read the paper right now?
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Henry Robinson 23. sij
Odgovor korisniku/ci @palvaro
I mean Heidi thinks she might be out of a job, so calibrate your threat level accordingly:
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Carlos Baquero 23. sij
Odgovor korisniku/ci @HenryR
It’s a very nice paper that advances the tightness that can be achieved with clock synchronization. Don’t think by itself it makes agreement and durability obsolete.
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Henry Robinson 23. sij
Odgovor korisniku/ci @xmal
I agree in the strict sense, but I wonder how close we are to practically being able to appeal to probabilistic arguments about the chances of A and B having observed the same instant.
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Bill de hÓra 23. sij
Odgovor korisniku/ci @HenryR @threadreaderapp
unroll plz
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Thread Reader App 23. sij
Odgovor korisniku/ci @dehora @HenryR
Bonjour, the unroll you asked for: Thread by : This paper that improves clock synchronization accuracy to tens of nanoseconds is amazing work. What… . Talk to you soon. 🤖
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