It has a non-zero cost though, which is why I don't like it. Things go wrong with the "roll" for example. You have potentially two versions of your code runnin

It has a non-zero cost though, which is why I don't like it. Things go wrong with the "roll" for example. You have potentially two versions of your code running against the same DB for some time. Stop -> deploy code -> start is simpler and less likely to go wrong.