[rabbitmq-discuss] Sematics of ACK/REQUEUE/DISCARD on a message

[Andreas Jung]

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Matthew Sackman wrote:
> On Wed, May 05, 2010 at 07:51:35PM +0200, Andreas Jung wrote:
>> Two questions:
>>
>> - - assuming a consumer could process a message with success - what is
>>   the difference in the message handling inside the queue between
>>   acknowledging it or discarding it - it will be removed from the queue
>>   in both cases?!
> 
> If you don't ack it, it will be retained by RabbitMQ and will be
> redelivered to some other consumer eventually when your current
> consumer cancels/dies.


Got it. Since the consumer is called through a call-back it will get the
same message again (after restarting and if it is the only consumer) if
the consumer dies without ack-ing the message.

Andreas
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