Usually it would advertise "at-least-once" somewhere prominently, like SQS, NSQ, etc.
It's really hard to be extremely available and to also guarantee there won't be dupes or out-of-order messages. Like databases, someone saying they offer both is usually hiding a trade-off.
EDIT: I think here "really hard" is a polite way of saying "impossible"
It's really hard to be extremely available and to also guarantee there won't be dupes or out-of-order messages. Like databases, someone saying they offer both is usually hiding a trade-off.
EDIT: I think here "really hard" is a polite way of saying "impossible"