[HN Gopher] Time, Clocks, and the Ordering of Events in a Distri...
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Time, Clocks, and the Ordering of Events in a Distributed System -
Paper Review
Author : ekez
Score : 45 points
Date : 2023-07-24 19:41 UTC (3 hours ago)
(HTM) web link (percisely.xyz)
(TXT) w3m dump (percisely.xyz)
| [deleted]
| reality_inspctr wrote:
| this is great! very clever logic model.
|
| I wrote something I think is highly relevant about a distributed
| L1 for time, that you might enjoy, OP?
|
| [oc] https://www.seanmcdonald.xyz/p/the-clockchain-protocol-
| the-l...
| Phelinofist wrote:
| Thanks for the link, really interesting!
|
| We have a distributed system (clouds & cars) that message events
| which need to be processed in order. However, the clock of some
| system participants (cars) are drifting quite often. We plan to
| use a logical clock for the ordering instead soon.
| michaelt wrote:
| No way of accessing your cars' GPS receivers' 100-nanosecond-
| precise time signal, huh?
| Phelinofist wrote:
| That's what I asked them as well and apparently... no.
| willis936 wrote:
| It probably won't be 100 ns accurate in motion, but still
| quite accurate. Practically speaking you won't get better
| than ~1 s unless you connect the PPS pin to an interrupt or
| PLL.
|
| With a bare minimum implementation you should be able to get
| the GPS time from the NMEA strings. You just need to
| guarantee you'll have GPS lock at least intermittently, which
| is probably true for a fleet of monitored cars in nearly all
| situations.
| econner wrote:
| Yea I always liked the way Spanner solved this. Let's not
| bother with any of the distributed system theory and just use
| that Google money to build in to the system extremely precise
| clocks :-D.
|
| (Obv I know it's more complicated than that, but where else
| can you be reductionist if not the internet)
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