The reason I mention Java is that when updating DNS in a business, there may be business to business flows that are critical. This is becoming more common than

The reason I mention Java is that when updating DNS in a business, there may be business to business flows that are critical. This is becoming more common than ever with cloud-to-cloud-to-cloud dependencies. Mishaps in cloud services can affect a service used by a large number of people. That is why I always tried to teach people to design apps so that TTL could in theory be 1 week and it would not matter. e.g. apex domain anycast IP used for authentication, then direct browsers, API clients and cloud daemons to a service dedicated domain name that is also anycast and uses health checks behind the scenes to take nodes out the picture rather than relying on DNS.