[rabbitmq-discuss] Roadmap Questions

Alexis Richardson alexis.richardson at gmail.com
Thu Jun 4 13:56:12 BST 2009

Hi guys,

I'd be happy to help people explore HA options until everyone is blue
in the face.  But, just in case that is not what people are looking
for, I think a good place to learn more is Tony's recent presentation
at London Geek Night.

Video and slides here:

Enjoy!  And feel free to shoot questions to the list.


On Wed, Jun 3, 2009 at 11:24 PM, Matthias Radestock <matthias at lshift.net> wrote:
> Keith,
> Keith Irwin wrote:
>> For instance, here's what I'd like to see:
>>  * Can store a LOT of messages on disk (more than fits in memory).
>>  * When one of the nodes in a cluster goes down, the queues on that
>> cluster begin working on another node. In other words, a fatal crash of
>> a node (server goes up in flames, disk melts) does not result in message
>> loss. (Replicated queues?)
> The two key features of the new persister are
> - message storage space is bounded by disk space rather than available
> physical or virtual memory
> - the computational cost of keeping a message stored is bounded
> So these address your first point.
> Your second point is only tangentially related to persistence - one can
> easily image a system where message loss is prevented by keeping a
> sufficient number of copies of the message in memory on different
> machines, without the messages ever hitting the disk.
> There are actually some fairly easy ways to get the kind of reliability
> you refer to from the existing RabbitMQ broker. Just to mention two of
> the options: 1) get the persister to write to a SAN, such that in the
> event of a node failure a standby node can pick up from where the first
> node left off, 2) route the messages to multiple queues on different
> nodes and get the consumers to consume from all the queues and perform
> deduplication.
> We have discussed these and other options with users on a number of
> occasions. Alexis may have some slides handy that illustrate the
> different approaches.
> Regards,
> Matthias.
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