alt Hacker NewsI have to admit - I still grind my teeth every time I see "dns propagation" used without a direct follow-up that it's a myth, you're looking at cascading cache expiry.
Propagation might be a useful way to visualise it, but doesn't match reality unless every cache is a warm cache.
Replies
thomascountz • today at 5:57 PM
https://jvns.ca/blog/2021/12/06/dns-doesn-t-propagate/
And checkout their Mess with DNS playgound!
bityard • today at 3:51 PM
Yes! The idea of DNS records "propagating" gave me entirely the wrong mental model of DNS very early in my career. Granted, the confusion didn't last long because I read the cricket book soon after, but it was still pretty jarring.
DNS changes propagate. They just do-so in a pull, not push, way.
It’s accurate to say that a user is waiting for the change to propagate if they are sitting there clicking re-try as they wait for the cascading cache expirations to do their thing.