[rabbitmq-discuss] Best practices about expiration of messages

Tue Sep 6 13:42:15 BST 2011

Hello,

Here is the thing :
- I've got a producer P and a consumer C.
- Pattern is request-response.

P constantly submit requests to consumers and wait for an answer for a given amount of time. Should C take longer to answer, P will consider there was a time-out and it just sends message N+1, discarding any answer related to N.

Thing is, if nothing is done, C will still process all messages it receives (and send response that will be discarded). This makes C accumulate messages in case they take an unusually long time to process.

I suppose this is a common problem. I was wondering if anyone had a best practice for this. Here are the ideas I got :
- P creates a different response queue for each message, C checks whether the response queue exists before processing a message
- Assuming P and C are time synchronized, P sends an expiration date along with each message, that C will check before doing anything

Any better idea would be appreciated,

Thanks,

Pierre-Marie
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