So it depends a bit on the failure. If it's the coordinator node you're connected to then everything would be un-responsive. If it's a single distributed node,

So it depends a bit on the failure. If it's the coordinator node you're connected to then everything would be un-responsive. If it's a single distributed node, then only queries targetting that node would fail. Most application frameworks and Postgres drivers do try to reconnect so there wouldn't be a change to application logic, but things during that time would fail as you might expect when a database is down.