[rabbitmq-discuss] Why are deliveries still showing even though msg counts show 0 in admin?
andy.berryman at channeladvisor.com
Wed Jan 4 15:09:32 GMT 2012
Still hoping someone out there can help me with this one. Any
guidance is greatly appreciated.
On Jan 3, 6:52 pm, AndyB <andy.berry... at channeladvisor.com> wrote:
> Let me try and explain with a bit more detail. My publisher and
> consumer code are both written in C# and are using the C# driver from
> the website. I am using message acknowledgements and each of my
> consumers is configured with a fetch count of 2. So given that I have
> 30 consumers, here is what I typically see when monitoring the admin
> page and the message counts ...
> While messages are being published, the ready and unacknowledged
> counts equal the value being displayed for total. And the
> unacknowledged value is equal to 60 (30 consumers * 2 fetch count).
> The incoming message rates will show a pretty varying value, but lets
> just say the average is ~300 messages/sec. And the deliveries are
> showing variable rates of ~60 messages/sec per consumer. This remains
> fairly constant while the messages are processed off the queue.
> Where I'm getting confused is that when it seems to me like all of the
> messages have been processed, the counts all show 0, I still see the
> delivery rates showing values and they continue to do so for a good
> amount of time. During this time, the counts remain 0, as well as the
> incoming messages rates (as nothing else is being published). So it
> seems to me like the counts arent showing messages that are really
> there, which are still being delivered. What's going on there? Could
> these possibly be messages that are being delivered from disk that got
> streamed there because memory was too low to keep them in RAM?
> On Jan 3, 5:06 pm, Michael Klishin <michael.s.klis... at gmail.com>
> > AndyB:
> > > What is confusing me is that I'm seeing the message counts for all
> > > values go to 0, but the deliveries are continuing to show work for a
> > > good bit of time (several minutes). So what messages are being
> > > delivered if the counts are showing 0?
> > It depends on your particular client but probably RabbitMQ delivers messages and clients then keep them around
> > until they are all processed. If you use message acknowledgements, there is no reason to worry: if your application crashes, RabbitMQ will notice that connection was closed and will requeue unacknowledged messages.
> > See basic.qos AMQP method if you want to control this behavior.
> > MK
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