| From: | Peter Geoghegan <pg(at)bowt(dot)ie> |
|---|---|
| To: | Andrew Dunstan <andrew(at)dunslane(dot)net> |
| Cc: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Bruce Momjian <bruce(at)momjian(dot)us>, "Drouvot, Bertrand" <bdrouvot(at)amazon(dot)com>, Andres Freund <andres(at)anarazel(dot)de>, Justin Pryzby <pryzby(at)telsasoft(dot)com>, Noah Misch <noah(at)leadboat(dot)com>, Jason Harvey <jason(at)reddit(dot)com>, PostgreSQL Hackers <pgsql-hackers(at)postgresql(dot)org>, "Tharakan, Robins" <tharar(at)amazon(dot)com> |
| Subject: | Re: [UNVERIFIED SENDER] Re: pg_upgrade can result in early wraparound on databases with high transaction load |
| Date: | 2022-07-05 19:50:12 |
| Message-ID: | CAH2-Wzm56aDZwhk99ka+TWMDDSv=KyEFt8uby9iww51w1_1Lpg@mail.gmail.com |
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| Lists: | pgsql-general pgsql-hackers |
On Tue, Jul 5, 2022 at 12:41 PM Peter Geoghegan <pg(at)bowt(dot)ie> wrote:
> Actually, commit 74cf7d46 was where pg_resetxlog/pg_resetwal's -u
> argument was first added, for use by pg_upgrade. That commit is only
> about a year old, and was only backpatched to 9.6.
I just realized that this thread was where that work was first
discussed. That explains why it took a year to discover that we broke
8.4!
On further reflection I think that breaking pg_upgrade for 8.4 might
have been a good thing. The issue was fairly visible and obvious if
you actually ran into it, which is vastly preferable to what would
have happened before commit 74cf7d46.
--
Peter Geoghegan
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