[nodesocket]

I've always thought TTL less than 60 seconds should be avoided, as some upstream DNS resolvers will ignore values less than 60 seconds and use a default long value. You are saying this is not true and a TTL of 10 seconds can safely be used?

[colmmacc]

I think it's safe, based on a lot of experiments. We use 5 seconds for S3 ...

    ;; ANSWER SECTION:
    s3.us-east-1.amazonaws.com. 5	IN	A	52.216.165.117

One of the biggest, highest traffic, systems on the internet!