[mafro]

RabbitMQ does not persist messages to disk. A common mistake with RMQ is treating it like something of a database.

You would need to run RMQ in HA mode with multiple brokers to have any chance of not losing data.

[ngrilly]

What about this: https://www.rabbitmq.com/persistence-conf.html ?

[mafro]

I've never seen that option before - I stand corrected. I'd be interested to see how having it switched on affects performance. Also I expect there are still few guarantees about data loss in the event of failure.

[ngrilly]

Here is some details:

https://www.rabbitmq.com/confirms.html#publisher-confirms-la...

To fully guarantee that a message won't be lost, it looks like you need to declare the queue as durable + to mark your message as persistent + use publisher confirm. And it looks like this costs you several hundreds milliseconds of latency.