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From "Christian Posta (JIRA)" <>
Subject [jira] [Commented] (AMQ-4565) Cannot unsubscribe from virtual topics
Date Tue, 04 Jun 2013 02:27:20 GMT


Christian Posta commented on AMQ-4565:

Hi Torsten,

It's not the same. AMQ-4356 had to do with true durable subscribers not able to subscribe
completely from a virtual topic. This issue I opened as a result of a discussion Scott England-Sullivan
and I had about subscribing to a queue which backs the virtual topic, and then not ever being
able to unsubscribe from it, ie, there is no good way for the subscriber to announce to the
broker "don't keep this subscription around anymore" since it's queue based... 
> Cannot unsubscribe from virtual topics
> --------------------------------------
>                 Key: AMQ-4565
>                 URL:
>             Project: ActiveMQ
>          Issue Type: Improvement
>          Components: Broker
>    Affects Versions: 5.8.0
>            Reporter: Christian Posta
> Virtual Topics allow us to do things with pub/sub that we cannot otherwise do with JMS
1.1 spec. However, with durable subs we can "unsubscribe" a consumer telling the broker we
are no longer interested in messages. If we just stop consuming, the queues can fill up.
> With the queue-based impl of VT, we have to wait for the queue to be empty to delete
it... to do that reliably, the producer would have to stop producing? And/or we have to use
some TTL for the messages? Not sure... 

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