From: | Alvaro Herrera <alvherre(at)2ndquadrant(dot)com> |
---|---|
To: | Bruce Momjian <bruce(at)momjian(dot)us> |
Cc: | Andres Freund <andres(at)2ndquadrant(dot)com>, Stephen Frost <sfrost(at)snowman(dot)net>, pgsql-hackers(at)postgresql(dot)org |
Subject: | Re: MultiXactId error after upgrade to 9.3.4 |
Date: | 2014-04-23 18:51:21 |
Message-ID: | 20140423185120.GR25695@eldon.alvh.no-ip.org |
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Thread: | |
Lists: | pgsql-hackers |
Bruce Momjian wrote:
> On Wed, Apr 23, 2014 at 03:42:14PM -0300, Alvaro Herrera wrote:
> > > > I still don't know under what circumstances this situation could arise.
> > > > This seems most strange to me. I would wonder about this to be just
> > > > papering over a different bug elsewhere, except that we know this tuple
> > > > comes from a pg_upgraded table and so I think the only real solution is
> > > > to cope.
> > >
> > > Shouldn't we log something at least if we are unsure of the cause?
> >
> > I don't know. Is it possible that XMAX_IS_MULTI got set because of
> > cosmic rays? At this point that's the only explanation that makes sense
> > to me. And I'm not sure what to do about this until we know more --
> > more user reports of this problem, for instance.
> >
> > I don't see any reasonable way to distinguish this particular kind of
> > multixact-out-of-bounds situation from any other, so not sure what else
> > to log either (you can see that we already emit an error message.)
>
> I guess I am lost then. I thought it supressed the error. What does
> the patch do?
You're right, it does. I am not sure I would apply it.
--
Álvaro Herrera http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Training & Services
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