[rabbitmq-discuss] Vanishing of persistent messages on durable, auto-deleting queue with dead-lettering
ernest.staszuk at comarch.pl
Mon Jul 16 11:37:44 BST 2012
First thank you for your answer. I spend some time thinking about actual
of this status quo and also how I can achieve my goal.
2012-07-01 20:23, Matthias Radestock writes:
> We deliberately kept the set of operations susceptible to
> dead-lettering small, to avoid unintended consequences. It is possible
> that actions like auto-deletion, queue lease expiry, explicit deletion
> and purging should all trigger the dead-letter mechanism, but I'd like
> to see compelling use cases first before making such a change.
I will describe the case I am dealing with:
We send some tasks to rabbit's exchange. To achieve load balancing at
rpc servers x-consistent-hash
is used. Auto-deleting queues with dead-lettering are fitting there
perfectly, because when one
of consuments goes down his queue is deleted and then new messages are
distributed only between
active consumers (due to auto-deleting) and also we can preserve badly
for another try or examination in another queue (due to dead-lettering).
But as consequence of choosing auto-deleting queue also some part of
messages (which won't be
dead-lettered when queue will be discarded). As there are cases when
loosing messages is not
an option I think if actual behavior is consistent with spirit of
dead-lettering's aims (imho to save
I would appreciate if you could submit your view on this case.
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