No if the subscriber is still down the message should also be resent.
So you're right it's not simply the active subscribers, it would be all the 
subscribers that were connected to the dispatch-router at some point and that 
were not explicitly closed.
Actually it's not even limited to the dispatch-router that received the 
message, we should also consider all the dispatch-routers inter-connected with 
it.

Olivier

-----Original Message-----
From: Gordon Sim <[email protected]>
Sent: mardi 13 novembre 2018 15:33
To: [email protected]
Subject: Re: [Dispatch Router] multicast distribution

On 13/11/18 13:58, VERMEULEN Olivier wrote:
> I guess yes, all the active subscribers when the router receives the message.
> If the message is not successfully acked by all of them, then yes the message 
> is requeued and sent again to all active subscribers.
> If one of the subscribers disconnects in the middle of the process I would 
> say we are back to the previous case and the message is resent to all active 
> subscribers.

What if another message is sent while the subscriber above remains 
disconnected? Does it just miss getting the message? If so, why is it so 
important that it didn't miss the first one? If not, that means that the set of 
subscribers to deliver to is not simply those that are active.

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