If I send a message to a topic, and it ends up being delivered to n subscriptions on that
topic, then the message expires, should the message be added to the expiry queue n times,
one for each subscription, or only once?
A more complex but related situation is for messages that have exceeded max delivery
attempts.
If a message is sent to a topic with n subscriptions. Then depending on how many times the
client calls recover() or rollback() for one or more of the subscriptions, then the
message could have exceeded max delivery attempts for some of the subscriptions but not
with others.
So the message needs to be added to the DLQ for some of the subscriptions, but not for
others - how does this effect the subscriptions who have not exceeded max delivery
attempts.
Can we end up with a situation where the same message (same message id) is in the queue
(dlq or expiry queue) multiple times? Would we get primary key violations in the
database?
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