Hi enrico, The delayed message feature is to support messages that can have any delay in a single partition. So, if the broker dispatches the messages based on the available time of the message, this will break the FIFO order.
So, if I understand correctly, "the behaviour of delayed messages even for Exclusive subscriptions, still preserving a strict FIFO order” means messages of a partition has same delay time? If so, I think we can achieve this at the client-side(Just check the head message is available or not) Thanks, Penghui On Apr 19, 2021, 8:00 PM +0800, Enrico Olivelli <eolive...@gmail.com>, wrote: > Hi, > I came across this great feature, Delayed Messages > https://github.com/apache/pulsar/wiki/PIP-26:-Delayed-Message-Delivery > > And I see that this feature does not work with Exclusive and Failover > subscriptions. > The reason explained in the PIP is that this is because we want to > guarantee FIFO order. > > I wonder if we could implement the behaviour of delayed messages even > for Exclusive subscriptions, still preserving a strict FIFO order. > > Enrico
