Conduit subscriptions when using Network of brokers and Camel topic subscriptions

[buc <cu...@gmail.com>]

Hi there,

I have trouble to understand how does the conduit subscriptions option work
in a network of brokers.
Below is a sample code that does the following:

* Create 3 brokers and network them: broker1 <> broker2 <> broker3
** conduitSubscriptions option is set on every netwotk connector
** The ttl is set so that messages and subscriptions can go through all the
brokers
* Create 3 camel contexts with some routes that allow to:
** Post a message to the topic1 from any client connected to any broker
** Subscribes to topic1 from any client connected to any broker

The unit test creates a Canel ProducerTemplate that posts a messages to
topic1 from the broker1.
As ActiveMQ and Camel are configured, and as far as I understand the
conduitSubscriptions option, I would expect the message to be delivered to
the mock endpoints only once on each.

The result is quite confusing:
* mockEndpoint1 receives 1 message
* mockEndpoint2 receives twice the same message
* mockEndpoint3 receives twice the same message

In the ActiveMQ and Camel debug logs I can clearly see that the message is
sent twice in the topic1 from broker1 to broker2 and same from broker 3 to
broker2.

It's expected that the topic1 subscriptions on broker2 and broker3 are
propoagated to broker1, but I though it would be considered as a unique
subscription from the broker1 perspective. This is not what seems to happen.

It's annoying because it introduces duplicate messages then. I thought the
conduitSubscriptions option was actually meant to fix this.

I must be missing something here but can't see what.

Any insight?



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Re: Conduit subscriptions when using Network of brokers and Camel topic subscriptions

[buc <cu...@gmail.com>]

The use of virtual topics makes my unit test pass. Every consumer gets
exactly one copy of the message. That makes sense and that's what I'm after.
I'd still be interested on an explanation of the issue I described though.



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