alt Hacker News> It should be the opposite: with more messages you want to scale with independent consumers, and a monotonic counter is a disaster for that.
Is there any method for uniqueness testing that works after fan-out?
> You also don’t need to worry about dropping old messages if you implement your processing to respect the commutative property.
Commutative property protects if messages are received out of order. Duplicates require idempotency.
hash your thing you want to do and see if you did it recently or in order by hashing each thing you wanted to do in order to get a new hash of all the things you did in the order you did it in one value.