[rabbitmq-discuss] Throttling when Fast Producer, Slow Consumer

Wed Mar 14 13:38:41 GMT 2012

Emile,

Thanks for the x-message-ttl info.

A couple of questions about your prior e-mail where you said "queues may get very long and need to spill over to disk..."

1. Am I right to think that this "spill over" happens for non-durable exchanges and queues?
2. Is there a way to govern when that spill over occurs, e.g., when queue gets to a certain size, or is this auto-magically handled by Rabbit?

-Paul

-----Original Message-----
From: Emile Joubert [mailto:emile at rabbitmq.com]
Sent: Wednesday, March 14, 2012 9:19 AM
To: Bell, Paul M.
Cc: Jerry Kuch; Simone Busoli; zmstone at gmail.com; davorin.rusevljan at gmail.com; rabbitmq-discuss at lists.rabbitmq.com
Subject: Re: [rabbitmq-discuss] Throttling when Fast Producer, Slow Consumer

Hi Paul,

On 14/03/12 12:59, Bell, Paul M. wrote:
> Also, is "x-message-ttl" accessible
> by means of Spring AMQP?

Yes, these are simply queue arguments. Spring AMQP allows you to declare
queues with arguments.

> On a related matter, please consider the case where the consumers
> simply aren't there (i.e., it's not that they're slow, they're simply
> NOT). Yet the long-running producers continue to publish to the
> exchange. Assume that we're dealing with a non-durable topic
> exchange. Am I right in thinking that, absent any bindings, the
> broker will simply discard incoming messages?

Yes, by default such messages will be discarded.

You can have such messages sent to an alternative exchange by using the
"alternative exchange" extension:
http://www.rabbitmq.com/extensions.html#alternate-exchange

Also see the "mandatory" publish argument:
http://www.rabbitmq.com/amqp-0-9-1-reference.html#basic.publish.mandatory
Publishers can have messages returned if they could not be routed.

-Emile

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