Hello Tim,

Thanks for the reply . We figured out the reason for duplicate message .

It was caused by the wildcard entry we used on federation configuration . This 
was because the wild card address was also an address queue on the Europe 
cluster. i.e events.#.

The consumer at the USA ends up receiving 2 messages because when we enable 
Federation on Europe cluster we saw that it created 2  federated addresses for 
the same consumer on Europe side. 1 with the complete address e.g 
events.name.v1.seminars  and another with the wildcard events.#.

We resolved it by having the wildcard in broker.xml to be events.name.#. 

But we see that the federated queue messages are only with status ‘Delivering’  
and not in acknowledged state . Is this expected ? Will these delivering 
message ever get deleted ? Is there a way these messages can be marked 
acknowledged because the consumer at the USA cluster was successfully  able to 
consume the message and it’s marked acknowledged on the consumer queue.



Best regards,
Saju Daniel

> On 20. Jun 2024, at 16:55, Timothy Bish <tabish...@gmail.com> wrote:
> 
> On 6/19/24 14:33, Saju Daniel wrote:
>> Hello All ,
>> 
>> We see duplicated message at the consumer end on USA federation with a
>> symmetric federation  setup as described here -
>> https://activemq.apache.org/components/artemis/documentation/2.20.0/federation-address.html
>> 
>> The configuration is described in the stackoverflow query here:
>> 
>> https://stackoverflow.com/questions/78633745/is-upstream-config-bidirectional-on-address-federation-with-symetric-topology-be?noredirect=1#comment138634573_78633745
>> 
>> Could someone kindly take a quick look and see if there is something wrong
>> in the configuration and why we are seeing duplicated messages .
>> 
>> Regards,
>> Saju
>> 
> If your setup configures the various nodes to use max-hops correctly I would 
> not expect duplicates. I tried reproducing it and could not so I'd suggest 
> creating an reproducer that you can share to allow for investigation.  What 
> version of Artemis are you using? Have you tried the latest release?
> 
> Another option would be to make use the AMQP federation using broker 
> connections which was introduced in v2.31.0 and steadily improved since that 
> release.
> 
> https://activemq.apache.org/components/artemis/documentation/latest/amqp-broker-connections.html#federation
> 
> -- 
> Tim Bish
> 
> 
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