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From "Martin C." <>
Subject Re: Producer blocked even after termination of all subscribers
Date Sat, 02 Jul 2011 12:58:24 GMT

I haven't done much work with durable subscriptions yet, but as far as
I understand the topic in connection with producer flow control, it is
guaranteed that no message is lost for any of the persistent
subscriptions. As you have stopped a subscription and once you hit a
configured storage limit, the broker can no longer accept any new
messages in order not to violate the guarantees it provides to the
persistent subscriptions.

So basically you need to ensure that you set the storage limits high
enough to provide enough space for any case one of your persistent
subscribers can be offline, and you also need to make sure you cancel
any persistent subscription that you know that the consumer won't come
back online.

Best regards,

On Fri, Jul 1, 2011 at 5:35 PM, edmallia <> wrote:
> Hi,
> I'm using ActiveMQ 5.5.0 communicate over a topic and after I follow the
> steps below my producer blocks.
> 1. Start two durable subscribers
> 2. Start producer
> 3. Start a slow non-durable subscriber
> 4. Stop the two durable subscriber
> 5. Wait for the producer to block (and get the log  "Usage Manager memory
> limit (1048576) reached for topic...")
> I'm assuming that at this point the producer is blocked waiting for the slow
> subscriber to catch up (through producer control flow mechanisms).  However,
> if I stop the slow non-durable subscriber the producer remains blocked.
> Stopping and restarting the producer has no effect.
> The two ways I've managed to get the producer to start again are to
> 1. Either, restart one of the durable subscribers
> 2. Or, delete the two offline durable subscribers from the ActiveMQ admin
> console
> Can someone help me figure out what is going on and why the producers
> restarts after fiddling around with the durable subscribers?
> Thanks
> Edward
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