[rabbitmq-discuss] RabbitMQ 2.8.0 released

[James Carr]

This release has two new features I've been wanting forever.

- dead lettering
- mirrored queues for federated exchanges

Thanks a lot guys. :)

Thanks,
James

On Mon, Mar 19, 2012 at 7:41 AM, Brendan Hay <brendan at soundcloud.com> wrote:
> Interesting approach, thanks Simon
>
>
> On Mon, Mar 19, 2012 at 1:36 PM, Simon MacMullen <simon at rabbitmq.com> wrote:
>>
>> On 19/03/12 12:24, Brendan Hay wrote:
>>>
>>> Would it be possible to describe in more (technical/erlangy) detail how
>>> the new flow-control mechanism works?
>>
>>
>> There's a few words at:
>>
>> http://www.rabbitmq.com/memory.html
>>
>> under "Per-Connection Flow Control", although that might not count as
>> "technical/erlangy". In terms of implementation:
>>
>> * A process that forwards AMQP messages on inside the broker is issued
>> credit for each process it sends messages to.
>>
>> * The receiving process will issue more credit as it processes these
>> messages.
>>
>> * If a process which receives messages from inside the broker runs out of
>> credit, it will in turn stop issuing credit until it gets more.
>>
>> * If a process which receives messages from the network runs out of
>> credit, it will stop reading from its socket until it gets more.
>>
>> * See the 'credit_flow' module (and its call sites) for more details.
>>
>> Since all the processes in the chain need to opt in to this new mechanism
>> for it to work, only the most common paths do flow control: messages
>> published via AMQP and STOMP. Messages published via other direct client
>> users (e.g. JSON-RPC or management) and messages which arise spontaneously
>> in the broker (dead lettering, log and trace messages) are not flow
>> controlled. Indeed it's hard to see how they could be.
>>
>> Cheers, Simon
>>
>>
>> --
>> Simon MacMullen
>> RabbitMQ, VMware
>
>
>
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