On 11/28/2008 06:07 AM, Michael Shuler wrote:
Facebook is still going to load slowly due to 30 second TTL on the A
record for www. and 10 minute TTL on inconsistent NS records. They are
announcing a set of NS records from the .com TLD servers, then handing
out completely different short-TTL NS records where the client needs to
perform final lookups, then handing out a final record that expires in
30 seconds, so the client has to go do it all again.. the price of
popularity and having to implement gss load balancing, I suppose..
Just to correct my coffee-deprived quick look.. the www. NS records are
consistent - they are delegating the www. subdomain to their gss load
balancers, which hand out the final A record lookup. A 'dig +trace
www.facebook.com' will show you the full authoritative path.