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From "Kevin Burton (JIRA)" <>
Subject [jira] [Commented] (AMQ-5557) GC of inactive queues should happen even if consumers > 0
Date Sun, 01 Feb 2015 23:55:34 GMT


Kevin Burton commented on AMQ-5557:

And perhaps this feature is enabled with a new flag.  say enableGcWithConsumersOrProducers...

This way existing users aren't confused by any new behavior.

> GC of inactive queues should happen even if consumers > 0 
> ----------------------------------------------------------
>                 Key: AMQ-5557
>                 URL:
>             Project: ActiveMQ
>          Issue Type: Bug
>    Affects Versions: 5.10.1
>            Reporter: Kevin Burton
> In my app we use lots of ephemeral queues which are active for a while, and then become
> Queue GC is very important for us.
> Right now , there is no safe way to use queue GC in this scenario if any future messages
could come into the queue.  Even if there's a low probability of this happening.
> Ideally the way this would work is if the queue is empty, and nothing is written to it
for the inactiveTimoutBeforeGC interval than it is GCd... regardless of the number of consumers
and producers.
> If producers/consumers WANT to disconnect, they can listen to advisory messages that
the queue has been GCd and then disconnect when the advisory message says that the queue has
been destroyed.
> Trying to emulate this by disconnecting yields tons of potential race bugs.
> For example, if you have a 60 second window, and you have no messages written, so you
close your consumer, it's totally possible that 1 message comes in 1ms after you disconnect.
> You would have no way of knowing this.  This message would stay there, not consumed ,

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