On 12/11/18 13:07, VERMEULEN Olivier wrote:
Hello,

I'm using 1 dispatch-router (1.3.0), 2 brokers (7.0.3) and a simple topic/queue 
configuration.
I was testing the multicast distribution on the dispatch-router with 1 producer 
on the topic and 2 listeners on the queue.
In AUTO_ACK everything seems to work fine but when I switch to CLIENT_ACK I 
have a strange behavior.
If I don't acknowledge the message in my listeners I would expect the message 
to go back to the broker (which is what I observed with the balanced 
distribution) but instead the message is just gone...
Do you know if there is a bug with the multicast distribution? Or did I 
misconfigure something?

I'm not clear on what your configuration is exactly, but multicast distribution in the router is not end-to-end acknowledged (it can't be, as there may be multiple receivers). The router that first handles the messages will acknowledge it to the producer.

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