[rabbitmq-discuss] Messages lost with RabbitMQ Federation

[Roman Gaufman | Xanview]

Ah! - very possible, changing my tests :) - I tried to reproduce briefly
but wasn't able to - I will leave it running for a few hours randomly
killing the connection and report back.

On 5 July 2012 14:09, Simon MacMullen <simon at rabbitmq.com> wrote:

> On 05/07/12 12:08, Roman Gaufman wrote:
>
>> However when I restart the VPN, the UK server has received 43737
>> messages while the US only received 43708 messages. Where did 29
>> messages disappear?
>>
>
> Is it instead possible that 29 messages have been duplicated? Remember
> that when you kill an AMQP connection where A is consuming from B, A can
> have sent acknowledgements which B has not yet received. In this case when
> the federation link comes back up again, those messages will be
> retransmitted. You will be able to see this as there will be a redelivered
> flag set in the federation headers. (But don't just throw away redelivered
> messages - they might not have reached A when the connection went down.)
>
> I suggest you modify your tests to send a fixed number of messages and see
> what happens.
>
> Cheers, Simon
>
> --
> Simon MacMullen
> RabbitMQ, VMware
>
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