Re: server auto-restarts and ipcs

Greg Stark <gsstark(at)MIT(dot)EDU> writes:
> Oh I missed the fact that you were talking about after a reboot. So the
> algorithm I described would produce exactly the same sequence of ids after any
> reboot given the same sequence of creation and deletions. Even if there's a
> different sequence as long as the n'th creation is for the m'th array slot it
> would get the same id. So collisions would be very common.

This seems to square with Ed's complaint that he frequently sees a
collision after a reboot. I've just committed some code that makes a
more extensive check as to whether a pre-existing segment actually has
any relevance to our data directory; should fix the problem.

regards, tom lane