[rabbitmq-discuss] Wrong number of messages_ready shown in queue when using message-ttl with federation.

[Simon MacMullen]

Have you read http://www.rabbitmq.com/ttl.html#per-message-ttl-caveats?

If messages expire while in the middle of a queue, they will not be 
removed until they reach the head of the queue. That sounds like what 
you're seeing.

Cheers, Simon

On 10/10/13 14:51, Malte Hurrelmann wrote:
> Hi,
>
> we're using a two broker setup, connected by the federation-plugin to
> ensure the consumers have a broker to fail over to, if the primary
> broker should become unreachable.
> Messages are published to an exchange in the master-broker with a
> message-ttl on them, so that they don't pile up endlessly on the main
> and backup broker.
>
> I noticed in some rare cases the number of "messages_ready" in a queue
> as shown in management_plugin / REST-API / "rabbitmqctl list_queues" is
> not correct and increases to grow until I do a GET on that queue.
> For example it shows 1000 messages and after I get 1 message of that
> queue next time it shows 500 messages remaining. After that the
> message-count is correct again.
>
> I'm planning to do some monitoring on that info, so it would be nice to
> have reliable info on the number of message left in the queues.
>
> Any ideas on how to fix this issue or where to get the correct amount of
> messages_ready elsewhere?
>
> Best regards,
> Malte.
>
>
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-- 
Simon MacMullen
RabbitMQ, Pivotal