| From: | Simon Riggs <simon(at)2ndQuadrant(dot)com> |
|---|---|
| To: | Robert Haas <robertmhaas(at)gmail(dot)com> |
| Cc: | Heikki Linnakangas <heikki(dot)linnakangas(at)enterprisedb(dot)com>, pgsql-hackers(at)postgresql(dot)org |
| Subject: | Re: relaxing sync commit if no WAL written (was Re: unlogged tables) |
| Date: | 2010-12-19 20:08:51 |
| Message-ID: | 1292789331.1193.9403.camel@ebony |
| Views: | Raw Message | Whole Thread | Download mbox | Resend email |
| Thread: | |
| Lists: | pgsql-hackers |
On Sun, 2010-12-19 at 07:33 -0500, Robert Haas wrote:
> On Sun, Dec 19, 2010 at 7:01 AM, Simon Riggs <simon(at)2ndquadrant(dot)com> wrote:
> > On Fri, 2010-12-17 at 13:35 -0500, Robert Haas wrote:
> >
> >> I'm
> >> thinking it makes sense to commit this part first.
> >
> > This will break Hot Standby, as previously explained. Don't.
>
> Uh, why? Skipping the commit record altogether would do that, but
> this patch doesn't do that.
I was looking for XLogStandbyInfoActive()
It isn't there, so you're either breaking HS or missing a possible
optimisation. Having said that, it would be useful to be able to assume
that all xids appear in the log, for diagnostic purposes.
So I now agree with the way you've coded it.
--
Simon Riggs http://www.2ndQuadrant.com/books/
PostgreSQL Development, 24x7 Support, Training and Services
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