Comment on Google Cloud DNSparentComments−ithkuil12yif you need DNS based failover you want low TTLs , e.g Google.com A record is 100s−gibybo12yStill though, aren't most consumers using their ISP's DNS servers, which will cache the same response for all of their customers in a region?−takeda12yIt all depends on how high ttl is, the number of queries increase exponentially as you decrease it, with ttl=0 you have no caching.My company makes about 160qps which translates to about half billion per month, so it doesn't seem too unrealistic.
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if you need DNS based failover you want low TTLs , e.g Google.com A record is 100s
Still though, aren't most consumers using their ISP's DNS servers, which will cache the same response for all of their customers in a region?
It all depends on how high ttl is, the number of queries increase exponentially as you decrease it, with ttl=0 you have no caching.
My company makes about 160qps which translates to about half billion per month, so it doesn't seem too unrealistic.