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I think you want to write to the AMQP spec as much as possible and allow 
multiple implementations.  Opentack supports Rabit MQ and QPID, and you 
should be able to use either.



On 05/18/2012 04:42 AM, Nick Barcet wrote:
> Hello everyone,
>
> Next week's irc meeting will have for goal to choose a reference
> messaging queue service for the ceilometer project.  For this meeting to
> be able to be successful, a discussion on the choices that we have to
> make need to occur first right here.
>
> To open the discussion here are a few requirements that I would consider
> important for the queue to support:
>
> a) the queue must guaranty the delivery of messages.
> To the contrary of monitoring, loss of events may have important billing
> impacts, it therefore cannot be an option that message be lost.
>
> b) the client should be able to store and forward.
> As the load of system or traffic increases, or if the client is
> temporarily disconnected, client element of the queue should be able to
> hold messages in a local queue to be emitted as soon as condition permit.
>
> c) client must authenticate
> Only client which hold a shared private key should be able to send
> messages on the queue.
>
> d) queue may support client signing of individual messages
> Each message should be individually signed by the agent that emits it in
> order to guaranty non repudiability.  This function can be done by the
> queue client or by the agent prior to en-queuing of messages.
>
> d) queue must be highly available
> the queue servers must be able to support multiple instances running in
> parallel in order to support continuation of operations with the loss of
> one server.  This should be achievable without the need to use complex
> fail over systems and shared storage.
>
> e) queue should be horizontally scalable
> The scalability of queue servers should be achievable by increasing the
> number of servers.
>
> Not sure this list is exhaustive or viable, feel free to comment on it,
> but the real question is: which queue should we be using here?
>
> Cheers,
> --
> Nick Barcet<nick.barcet at canonical.com>
> aka: nijaba, nicolas
>
>
>
>
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