[rabbitmq-discuss] RabbitMQ and Warrens

Adam Petrovic adam at petrovic.com.au
Tue Aug 14 08:59:28 BST 2012

Hi. I am just reading up about the concept of HAProxy load-balanced warrens 
(active / standby nodes) and I can't quite come up with a solution to a 
bugging question.

I understand that the concept of the load balanced warren is for HAProxy to 
automatically fail over to the standby node, should the active node fail 
and go down. In doing so, any existing messages on the active node would be 
lost until this node is brought back up.

Which brings me to my question, what happens to the pending (still to be 
consumed) messages on the standby node when the active node is brought back 
up. Are they lost, or should the application logic handle this itself? 
Because as far as I know, HAProxy has no way of dealing with this issue.


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