[rabbitmq-discuss] Queue disappears during high volume federation

Matt Pietrek mpietrek at skytap.com
Tue Aug 14 17:29:32 BST 2012

Hmm... I'm using Pika. Perhaps it's feeling overloaded and dropping the
connection. At least I have a new direction to pursue.


On Tue, Aug 14, 2012 at 8:59 AM, Matthias Radestock
<matthias at rabbitmq.com>wrote:

> Matt,
> On 14/08/12 01:25, Matt Pietrek wrote:
>> I'm hitting an issue where a queue disappears from underneath me in a
>> high volume federated scenario.
>> Background: I'm on RabbitMQ 2.8.5 on top of Ubuntu 10.04.
>> I have three brokers bi-directionally federated similarly to the "Small
>> complete Graph" example in http://www.rabbitmq.com/**federation.html<http://www.rabbitmq.com/federation.html>.
>> My
>> exchange is called "Skytap", and is a topic exchange. One of the routing
>> key 'words' directs messages to the appropriate broker.
>> In my example, I have a single master sending "requests" to two slaves
>> which reply back to the master, simulating an RPC scenario. A client app
>> on the 'master' broker reads from an exclusive queue called 'master",
>> while client apps on the slave brokers read from an exclusive queue
>> called "slave'.
>> In the low volume case, everything works as expected: A steady stream of
>> request messages seen on the slaves and a steady stream of reply
>> messages seen on the master.
>> However, if I write "request" messages as fast as possible, in short
>> order I see the 'master' queue disappear. (I know this because I have
>> mnesia logging turned on.)
> Since the 'master' queue is exclusive, and there is nothing unusual in the
> rabbit logs indicating any rabbit-internal problems (you've checked the
> sasl log as well, right?) the only way that queue can vanish is for it to
> be either deleted explicitly by the creating connection or for the
> connection to have been closed.
> Can't see how federation would have anything to do with this since it is
> not touching user queues.
> Matthias.
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