[rabbitmq-discuss] RabbitMQ - can we make use policies as load balancing in cluster?

[Rajasekhar P]

Thank you very much MK for detailed explanation.


On Fri, Oct 18, 2013 at 1:21 PM, Michael Klishin <mklishin at gopivotal.com>wrote:

> On 18 Oct 2013, at 11:40, Rajasekhar P <sekhar434145 at gmail.com> wrote:
>
> > Can you please clarify me this as well,  with policies only we can
> achieve mirrored queues right?
>
> Policies is a way to add queue attributes in a centralised way. Instead of
> your apps knowing how to set up mirroring or
> replication, you may choose to configure a policy to do it instead.
>
> A policy is a named pattern, e.g. ^log.*, which matches queue names. For
> the names that match, policy is applied
> (extra attributes are added).
>
> At the moment, policies are used for two RabbitMQ features: mirrored
> queues (replication of message contents) and
> federated exchanges (primarily useful for WAN-friendly asynchronous
> replication).
>
> > if not, how mirrored queues and policies are different?
>
> See above.
>
> > In the previous mail you have mentioned something about federated
> exchanges. Can we achieve load balancing with this?
>
> Not really. Federated exchanges allow you replicate a stream of messages
> published to exchange X across N nodes
> or clusters.
>
> Federated queues are different. They allow load balancing of a single
> queue between nodes, however,
> this is a new feature that's only available in RabbitMQ 3.2 (nightlies)
> and need some documentation
> improvements.
>
> Feel free to give nightly builds a try but wait for 3.2 final release
> before deploying into production.
>
> > And how exactly it is different from Mirrored queues? Currently we are
> using 3.1.3,  can you please share docs related federation?
>
> http://www.rabbitmq.com/federation.html
>
> Initial federated queues docs:
> http://next.rabbitmq.com/federated-queues.html
>
> MK
>
>
>
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