Hacker News new | ask | show | jobs
by mota7 1203 days ago
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.
1 comments
azurelake 1203 days ago
> 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.

link
randomswede 1202 days ago
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.

link