[rabbitmq-discuss] Publisher Confirms in mirrored queues

Thu Jul 19 19:01:31 BST 2012

Hi,

I might be missing some configuration.
I have two consumers(Two nodes from two different clusters) for a queue,
waiting on the queue.
When I push data to the queue, each consumer receive alternative messages.
My requirement is all consumers should receive all messages.

Thanks,
Prashanth.

On Thu, Jul 19, 2012 at 1:43 PM, Prashanth <meetprashanth437 at gmail.com>wrote:

> Thank You Tim.
>
>
> On Wed, Jul 18, 2012 at 4:52 PM, Tim Watson <watson.timothy at gmail.com>wrote:
>
>>
>> On 18 Jul 2012, at 20:15, Prashanth <meetprashanth437 at gmail.com> wrote:
>>
>> Hi all,
>>
>>
>> Hi
>>
>> I was confused after reading the publisher confirm documentation.
>>
>> Similarly, messages published by clients using publisher confirms<http://www.rabbitmq.com/extensions.html#confirms> will
>> still be confirmed correctly even if the master (or any slaves) fail
>> between the message being published and the message being able to be
>> confirmed to the publisher. Thus from the point of view of the publisher,
>> publishing to a mirrored-queue is no different from publishing to any other
>> sort of queue. It is only consumers that need to be aware of the
>> possibility of needing to re-consume from a mirrored-queue upon receipt of
>> a Consumer Cancellation Notification<http://www.rabbitmq.com/extensions.html#consumer-cancel-notify>
>> .
>>
>>
>> So from the publisher's point of view, it looks like just one queue and
>> the confirm means every surviving mirror has received and accepted the
>> message.
>>
>> Equally, in the case of publisher confirms, a message will only be
>> confirmed to the publisher when it has been accepted by all of the mirrors.
>> It is correct to think of the semantics as being the same as a message
>> being routed to multiple normal queues, and of a transaction with
>> publications within that similarly are routed to multiple queues.
>>
>> After reading the above lines. Now I am confused about the publisher
>> confirms. The first paragraph says that publishing to mirrored queues is
>> like publishing to each individual queue.
>>
>>
>> Where does it say that? It says that publishing to mirrored queues is
>> atomic with respect to confirms.
>>
>> Messages are published to all the queues and each queue sends publisher
>> confirms.
>>
>>
>> That's not what it says. It says that all queues will have the message
>> before a confirm is sent to the publisher from the queue to which it
>> originally published.
>>
>> The publisher knows next to nothing about the mirrors.
>>
>> In the second paragraph it says a message will only be confirmed to the
>> publisher when it has been accepted by all of the mirrors.
>> Those two paragraph looks like they say two opposite things.
>>
>> Please, correct me if I am wrong.
>>
>>
>> Thanks,
>> Prashanth.
>>
>>
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