Well, when my application starts, about 100 backend database connections
start up at the same time so this fits in with the circumstance you
describe. However, I'm just using a standard ext2 filesystem on 2.2 linux
kernel.
It's good to know that this error should be harmless.
----- Original Message -----
From: "Tom Lane" <tgl@sss.pgh.pa.us>
To: "Brian Hirt" <bhirt@mobygames.com>
Cc: "Postgres Hackers" <pgsql-hackers@postgresql.org>; "Brian A Hirt"
<bhirt@berkhirt.com>
Sent: Tuesday, December 18, 2001 12:32 PM
Subject: Re: [HACKERS] problems with table corruption continued
> "Brian Hirt" <bhirt@mobygames.com> writes:
> > Do you think this might also explain the following errors i was seeing?
>
> > NOTICE: Cannot rename init file
> > /moby/pgsql/base/156130/pg_internal.init.19833 to
> > /moby/pgsql/base/156130/pg_internal.init: No such file or directory
>
> No, that error is not coming from anywhere near VACUUM; it's from
> relcache startup (see write_irels in src/backend/utils/cache/relcache.c).
> The rename source file has just been created in the very same routine,
> so it's difficult to see how one would get a "No such file" failure from
> rename().
>
> It is possible that several backends create temp init files at the
> same time and all try to rename their own temp files into place as
> the pg_internal.init file. However, that should work: the rename
> man page says
>
> The rename() system call causes the source file to be renamed to
> target. If target exists, it is first removed. Both source and
> target must be of the same type (that is, either directories or
> nondirectories), and must reside on the same file system.
>
> If target can be created or if it existed before the call, rename()
> guarantees that an instance of target will exist, even if the system
> crashes in the midst of the operation.
>
> so we should end up with the extra copies deleted and just one init file
> remaining after the slowest backend renames its copy into place.
>
> Do you by chance have your database directory mounted via NFS, or some
> other strange filesystem where the normal semantics of concurrent rename
> might not work quite right?
>
> FWIW, I believe this condition is pretty harmless, but it would be nice
> to understand exactly why you're seeing the message.
>
> regards, tom lane
>
