[rabbitmq-discuss] Schedule Messages

[Jon Brisbin]

I do something very similar with retries when operations triggered by a message fail. On failure, I write the message, exchange, routing key, and header information to a Riak server. A scheduled job comes along later and removes these messages from Riak and re-publishes them. The process may or may not be repeated N times, depending on whether later runs were successful or not.

I don't know if Rabbit has this functionality built-in, but having a "delayed delivery" would be awesome.

The only other way to do it is to actually publish and deliver a message, but have the consumer delay acting on it. I felt like a more reliable solution is to persist a message to a NoSQL store where I can delete, retrieve, or replay the message as many times as I want to. It adds another component to the mix, but I use Riak for things like this anyway, so why not? :)

Jon Brisbin
Portal Webmaster
NPC International, Inc.



On Sep 27, 2010, at 8:54 AM, Darren Lee wrote:

> Hi everyone,
> 
> I’m looking for advice on the best way to schedule messages to be received after a certain time. I have a system where files get published out to a CDN and then the system needs to verify the files were propagated out correctly, this can sometimes take hours. I would like my subscriber to see a message, check for completion and if not put the message back on the queue to be dealt with in X minutes time.
> 
> Thanks for any help,
> Darren
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