On Wed, Feb 04, 2009 at 12:24:23PM -0500, Wietse Venema wrote:
> Victor Duchovni:
> > [ Wietse is it safe to move queue files active -> hold -> incoming in
> > a short time? Could some recipients be delivered twice by two delivery
> > agents in parallel (both deliveries starting after the second incoming
> > to active transition)? ]
>
> Each delivery agent holds a read lock on the file that it delivers
> mail from. This will keep the queue manager from scheduling new
> deliveries. The mechanism prevents duplicate deliveries after
> "postfix reload" + "postfix flush".
Yes, this solves the queue-manager reload problem, because the active
queue is empty when the queue-manager reloads. In the new scenario,
the active queue is not empty, and an active file is "surreptitiosly"
moved (multiple quick steps) to "incoming". If all the recipients
are at busy destinations, there may not (yet) be any delivery agent
locks, and the file could enter the queue a second time.
Is this possible?
--
Viktor.
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