Rapid growth, lessons learned and improvements at Fly.io

Re:Rapid growth, lessons learned and improvements at Fly.io by mota7 on Monday March 06, 2023 @05:37PM (#35048768)

Like most things, it's more complex than that, and as a result it can be either faster or slower than 'median(RTT to each DC in quorum)'.

It's a delicate balance based on the locations that rows are being read and written. In the case where a row being repeatedly written from only one location and not being read from different location, the writes can be significantly faster than would be naively expected.

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Re:Rapid growth, lessons learned and improvements at Fly.io by azurelake on Monday March 06, 2023 @06:02PM (#35049065)

> Like most things, it's more complex than that,

Sure, no doubt. My point wasn't really about the particularities. It was around the mistaken idea that I see sometimes where people believe that TrueTime allows for synchronized global writes without any need for consensus.

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Re:Rapid growth, lessons learned and improvements at Fly.io by randomswede on Tuesday March 07, 2023 @10:41AM (#35056549)

The speed of light in vacuum is a hard upper limit. Most signal paths will be dominated by fibre optics (about 70% of C) and switching (adding more delay).

But, yes TrueTime will not magically allow data to propagate at faster-than-light speeds.

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