[rabbitmq-discuss] Impact of Updating Queue Parameters on Queued Messages

[Simon MacMullen]

On 17/12/2013 18:15, Richard Raseley wrote:
> A) The messages are purged, the queue is deleted and recreated with the
> new parameters.
>
> B) The messages are preserved and the queue's parameters are just updated.
>
> C) Something else?

C) The messages are preserved and the queue's arguments are *not* 
updated (i.e. the definition for that queue is ignored). Queue arguments 
never change; the import / export definitions feature does not change that.

If you want to add a DLX to an existing queue you can do that with 
policies in 3.2.x: see "Configuration using policy" under 
http://www.rabbitmq.com/dlx.html

Cheers, Simon