[rabbitmq-discuss] Drawbacks and advantages of "autoack" mode?

[Alfonso Pantoja]

On 18 abr, 14:48, Matthias Radestock <matth... at rabbitmq.com> wrote:

> Yes, it can. Specifically, when rabbit recovers from a non-clean
> shutdown it may mark all messages as delivered since it has no way of
> knowing for certain whether a message has been delivered. That way a
> consumer can be sure that if the flag is not set then the message
> definitely will not have been delivered before, which is the safer way
> to deal with this uncertainty.
>

When consuming with auto_ack the acks are done by the consumer or
RabbitMQ automatically acks messages once delivered?