[rabbitmq-discuss] Journaling for RabbitMQ?

[Jon Brisbin]

I suspect it would take about 30 minutes to create a special journaled exchange type that simply logged every message that came through to a log file. You'd need to use a custom exchange rather than a built-in version. That being said, it would act just like a built-in exchange type. But you probably wouldn't want to run something like this in production anyway, right? 

Thanks! 

Jon Brisbin 
http//jbrisbin.com 

----- Original Message -----

> From: "Meredith Gregory" <lgreg.meredith at gmail.com>
> To: rabbitmq-discuss at lists.rabbitmq.com
> Sent: Thursday, May 26, 2011 1:55:20 PM
> Subject: [rabbitmq-discuss] Journaling for RabbitMQ?

> Dear Rabbitters,

> i was working with a client recently and they asked whether RabbitMQ
> had a journaling feature. The client was used to working with MSMQ
> which has such a feature and allows them to get a view of queue
> usage history, such as message deposited to queue, message read from
> queue, etc. The question came up in the context of debugging a
> message processing code path where we couldn't readily tell whether
> the message had been deposited to the queue and was being nabbed by
> a dispatcher faster than we could see or whether the message was
> never arriving at the queue at all. The client observed that with a
> journaling feature there would be no need to introduce more
> debugging statements into application code. So, i'm passing their
> question along to you.

> In this connection i will raise a point i've made before to this
> community. With such a journaling log i can take off-the-shelf tools
> and probe message traces for correctness properties. Specifically, i
> have already demonstrated with a little project called XTrace that
> with an xml-based message history format we can use schema
> conformance to probe message trace for properties. The basic idea is
> to encode a property as a schema. The beauty of this approach is
> that it is post facto and does not require a specific schema to
> govern message trace history. Rather, an application programmer
> devises schema to investigate the message trace history to look for
> conformance to protocol or validate a guess about where/how things
> might be going awry.

> i mention this latter point in connection with the client's question
> to amplify the argument for the feature. Their sense of the
> separation of concerns and independent value for RabbitMQ is right
> on track and only the tip of the iceberg of what can be done.

> Best wishes,

> --greg

> --
> L.G. Meredith
> Managing Partner
> Biosimilarity LLC
> 7329 39th Ave SW
> Seattle, WA 98136

> +1 206.650.3740

> http://biosimilarity.blogspot.com

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