[rabbitmq-discuss] Ghost consumers problem

Fri Jul 5 08:03:07 BST 2013

On Thursday, July 4, 2013, Simon MacMullen wrote:

> AMQP heartbeats should solve this problem. Since 3.0.0 the server attempts
> to negotiate heartbeats by default but I don't know what rabbitmq-c does in
> response to that;

partial support for heartbeats has recently been added in the master branch
of rabbitmq-c.

If you specify a non-zero parameter for heartbeats in amqp_login() the
library will attempt to service heartbeats while doing blocking reads in
amqp_simple_wait_frame() or while doing frequent amqp_basic_publish()
calls. Heartbeats are not serviced if you're not making calls into
rabbitmq-c.

> On 04/07/13 15:06, Jose Ramon Palanco wrote:
>
>>
>> We have an rabbitmq installation and we use rabbitmq-c clients compiled
>> for microsoft windows and running as a service. Everything works fine,
>> even we have enabled encrypted communications using OpenSSL.
>>
>> It turns out that we have a problem with ghost consumers and having read
>> a lot, we still come up with the solution.
>>
>> The scenario is as follows:
>>
>> Clients connect to the broker and everything works fine until Windows
>> restarts. To speedup system reboot, Microsoft doesn't give us a chance
>> to finish executing our tasks: so we can't closed session properly.
>>
>> This implies that the queue remains alive with a ghost consumer.
>>
>> After reboot, the service starts and when trying to create the queue, it
>> conflicts with the former queue. We tried to create the queue as
>> exclusive, but it doesn't allow us to connect because we haven't
>> permission.
>>
>> Is there a way to close the communications when a connection is not
>> stablished? Or in the worst case, there is a procedure to clean the
>> queues with ghost consumers?
>>
>>
>> Best regards
>>
>> J.R
>>
>>
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>>
>
> --
> Simon MacMullen
> RabbitMQ, Pivotal
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