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Re: timezone GUC

From: Alvaro Herrera <alvherre(at)commandprompt(dot)com>
To: Robert Haas <robertmhaas(at)gmail(dot)com>
Cc: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, pgsql-hackers <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: timezone GUC
Date: 2011-05-26 17:41:40
Message-ID: 1306431591-sup-7071@alvh.no-ip.org (view raw or flat)
Thread:
Lists: pgsql-hackers
Excerpts from Robert Haas's message of dom may 22 23:09:47 -0400 2011:
> On Sun, May 22, 2011 at 10:24 PM, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:
> > Robert Haas <robertmhaas(at)gmail(dot)com> writes:
> >> On Sun, May 22, 2011 at 9:54 PM, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:
> >>> But also, 99.999% of the time
> >>> it would be completely wasted effort because the DBA wouldn't remove the
> >>> postgresql.conf setting at all, ever.
> >
> >> Well, by that argument, we ought not to worry about masterminding what
> >> happens if the DBA does do such a thing -- just run the whole process
> >> and damn the torpedoes.  If it causes a brief database stall, at least
> >> they'll get the correct behavior.
> >
> > Yeah, maybe.  But I don't especially want to document "If you remove a
> > pre-existing setting of TimeZone from postgresql.conf, expect your
> > database to lock up hard for multiple seconds" ... and I think we
> > couldn't responsibly avoid mentioning it.  At the moment that disclaimer
> > reads more like "If you remove a pre-existing setting of TimeZone from
> > postgresql.conf, the database will fall back to a default that might not
> > be what you were expecting".  Is A really better than B?
> 
> Well, I'm not entirely sure, but I lean toward yes.  Anyone else have
> an opinion?

Yes, I think the lock-up is better than weird behavior.  Maybe we should
add a short note in a postgresql.conf comment to this effect, so that it
doesn't surprise anyone that deletes or comments out the line.

-- 
Álvaro Herrera <alvherre(at)commandprompt(dot)com>
The PostgreSQL Company - Command Prompt, Inc.
PostgreSQL Replication, Consulting, Custom Development, 24x7 support

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