autoAck mode

[avinash kolla]

Hi Guys,

I am using an application with rabbitmq autoack mode.

I understand that autoAck mode is fire and forget but i can see the acknowledgements in rabbitmq console.

When the rabbitmq node goes down in 3 node clusters, some messages are re-delivered.

On what basis, the messages are re-delivered with autoack mode? Because I thought the rabbitmq server had no idea whether the message reached the consumer in autoAck mode. 

Please advise me on this issue.

Thanks,

Kolla Avinash