Re: Fwd: Re: A new look at old NFS readdir() problems?

From: Bruce Momjian <bruce(at)momjian(dot)us>
To: David Steele <david(at)pgbackrest(dot)org>
Cc: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Thomas Munro <thomas(dot)munro(at)gmail(dot)com>, Greg Sabino Mullane <htamfids(at)gmail(dot)com>, Robert Haas <robertmhaas(at)gmail(dot)com>, Larry Rosenman <ler(at)lerctr(dot)org>, Pgsql hackers <pgsql-hackers(at)lists(dot)postgresql(dot)org>
Subject: Re: Fwd: Re: A new look at old NFS readdir() problems?
Date: 2025-01-08 17:40:00
Message-ID: Z364cK53dbnwnQDJ@momjian.us
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On Tue, Jan 7, 2025 at 01:03:05AM +0000, David Steele wrote:
> > > I'm more concerned about the report we saw on SUSE/NFS [1]. If that
> > > report is accurate it indicates this may not be something we can just
> > > document and move on from -- unless we are willing to entirely drop
> > > support for NFS.
> > > [1] https://github.com/pgbackrest/pgbackrest/issues/1423
> >
> > I installed an up-to-date OpenSUSE image (Leap 15.6) and it passes
> > my "rmtree" test just fine with my NAS. The report you cite
> > doesn't have any details on what the NFS server was, but I'd be
> > inclined to guess that that server's filesystem lacked support
> > for stable NFS cookies.
>
> The internal report we received might have had a similar cause. Sure seems
> like a minefield for any user trying to figure out if their setup is
> compliant, though. In many setups (especially production) a drop database is
> rare.

Will people now always get a clear error on failure? Crazy idea, but
could we have initdb or postmaster start test this?

--
Bruce Momjian <bruce(at)momjian(dot)us> https://momjian.us
EDB https://enterprisedb.com

Do not let urgent matters crowd out time for investment in the future.

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