[rabbitmq-discuss] Does Rabbit store fanout messages once, or N times?

Alexandru Scvorţov alexandru at rabbitmq.com
Mon Feb 13 23:11:53 GMT 2012


If the broker is not clustered, the message content is only stored once,
but some information about it (its id, its position in each queue) is
stored N times.

If the broker is clustered, the situation is the same as above and
the clustered brokers will exchange message content on-demand.

By the way, this is true for any exchange type, not just fanout.


On Mon, Feb 13, 2012 at 03:05:32PM -0800, Chip Salzenberg wrote:
> Given an exchange that fans out to N queues, and delivery-mode=2, how
> many copies of messages to the given exchange are stored on disk and/
> or memory -- one, or N?
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