jcurran@istaff.org wrote:
Fairly abstract - Facebook Engineering - https://m.facebook.com/nt/screen/?params=%7B%22note_id%22%3A10158791436142200%7D&path=%2Fnotes%2Fnote%2F&_rdr

Also, Cloudflare’s take on the outage - https://blog.cloudflare.com/october-2021-facebook-outage/

FYI,
/John

This may be a dumb question, but does this suggest that Facebook publishes rather short TTLs for their DNS records?  Otherwise, why would an internal failure make them unreachable so quickly?

Miles Fidelman

-- 
In theory, there is no difference between theory and practice.
In practice, there is.  .... Yogi Berra

Theory is when you know everything but nothing works. 
Practice is when everything works but no one knows why. 
In our lab, theory and practice are combined: 
nothing works and no one knows why.  ... unknown