[rabbitmq-discuss] Exactly Once Delivery

Alexis Richardson alexis at rabbitmq.com
Sat Aug 7 21:22:04 BST 2010

On Sat, Aug 7, 2010 at 12:50 PM, Matthew Sackman <matthew at rabbitmq.com> wrote:
> On Fri, Aug 06, 2010 at 10:43:56PM +0100, Tim Fox wrote:
>> The way we do it in HornetQ is we have a well defined header key
>> "_HQ_DUP_ID". The client can set this with some unique value of it's
>> choice before sending (e.g. a GUID). When the server receives the
>> message if the _HQ_DUP_ID header is set, it looks up the value in
>> it's cache, and if it's seen it before it ignores it. The cache can
>> optionally be persisted.
> How do you prevent the cache from growing without bound?

AFAIK the normal approach with this system is to bound it arbitrarily.

> Matthew
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