[rabbitmq-discuss] Is internal delivery (between exchanges) guaranteed?

Wed Nov 21 12:49:02 GMT 2012

I am new in RabbitMQ and message brokers in general. Could you please 
point me to a documentation where can I read about using "tx or confirms"?
Many thanks in adv.

MM

W dniu 2012-11-21 12:08, Simon MacMullen pisze:
> That's a logical way to look at the Rabbit internals. But it's not how 
> things are built in terms of Erlang processes.
>
> In terms of Erlang processes, a message first goes to the reader (read 
> side of a connection) then to a channel, then to queues. Exchanges are 
> just routing logic which runs in the channel process.
>
> Therefore messages can't exist "in" exchanges. But they can and do 
> exist in the reader and channel processes before they get to the queues.
>
> There are lots of ways (primarily node failure) that messages could 
> get as far as reader or channel, but be lost before they reach the 
> queue. IF you use tx or confirms, then you know that when a message 
> has been confirmed / tx.commit finishes it has made it as far as the 
> queue.
>
> Cheers, Simon
>
> On 21/11/12 11:01, Michał Michalak wrote:
>> Assuming I have single host RabbitMQ server and settings like below:
>>
>>                    .--------------.
>>                 .->| EX fanout    |
>> .-----------.--'  | "monitoring" |
>> | EX fanout |     '--------------'      .----.
>> | "common"  |--.  .-----------.      .->| Q1 |
>> '-----------'  '->| EX direct |--q1--'  '----'
>>                    | "queues"  |--q2--.  .----.
>>                    '-----------'      '->| Q2 |
>>                                          '----'
>>
>> When I send message to exchange "common" with routing key "q1" - is it
>> guaranteed that message reach Q1 queue? I want to make sure such message
>> wont get stuck somewhere between exchanges or between exchange and 
>> queue.
>>
>>
>>
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>