[rabbitmq-discuss] Ready, Unacked and Total messages of Queues

Tue Apr 15 08:55:45 BST 2014

thanks very much MK

So it's good to hear that #ready msgs high is not impacting RabbitMQ
performance.

because we encountered an issues like the total messages in rabbit was up
to 300K, while some applications have queues of extremely high #ready, but
no #unack, while some applications have queues of high #unack, but no
#ready.

thats helps me to troubleshoot which application I should look into.

Thanks.
Cheers

On Tue, Apr 15, 2014 at 3:42 PM, Michael Klishin <mklishin at gopivotal.com>wrote:

> On 15 April 2014 at 11:37:39, Juno Chan (juno at algorithmictradinggroup.com)
> wrote:
> > > thanks very much. So, for the queues having high values in ready&
> > total # of messages(even go up to 300K messages), rabbit MQ performance
> > won't get affected?
> > only those queues having high values in unacked and total would
> > harm the rabbitMQ performance, is that correct?
>
> Unacknowledged messages are still kept around by RabbitMQ until they are
> acknowledged
> or rejected, so it’s the total number of messages that really  matters.
>
> > BTW, for 2 applications subscribing to the same subscribe channel,
> > 2 separate queues are created, if for some reasons, one of them
> > has problems and cause the queue stuck (e.g. high # unack messages)
> > will another queue being affected?
>
> A single queue can only use a single CPU core. The number of messages in
> the longest
> matter a lot less compared to how much disk I/O RabbitMQ has to do, either
> due to
> memory pressure or a high rate of messages published as persistent and
> routed to
> durable queues.
>
> Avoid overloaded queues as much as possible. See also
>
>
> http://www.rabbitmq.com/blog/2014/01/23/preventing-unbounded-buffers-with-rabbitmq/
> http://www.rabbitmq.com/blog/2014/04/10/consumer-bias-in-rabbitmq-3-3/
>
> http://www.rabbitmq.com/blog/2014/04/14/finding-bottlenecks-with-rabbitmq-3-3/
> --
> MK
>
> Software Engineer, Pivotal/RabbitMQ
>

-- 
Juno Chan
Algorithmic Trading Group (ATG) Ltd
www.algorithmictradinggroup.com
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