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Re: pg_upgrade fails with missing FTS resources

From: Bruce Momjian <bruce(at)momjian(dot)us>
To: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
Cc: Daniele Varrazzo <daniele(dot)varrazzo(at)gmail(dot)com>,pgsql-bugs(at)postgresql(dot)org
Subject: Re: pg_upgrade fails with missing FTS resources
Date: 2012-06-16 02:35:04
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Lists: pgsql-bugs
On Fri, Jun 15, 2012 at 10:27:59PM -0400, Tom Lane wrote:
> Bruce Momjian <bruce(at)momjian(dot)us> writes:
> > On Fri, Jun 15, 2012 at 04:15:57PM +0100, Daniele Varrazzo wrote:
> >> pg_upgrade fails on missing FTS dictionaries requiring external files.
> >> --check fails to detect the incompatibility.
> > Sure, we can test for that.  What system column stores these file names?
> Trying to check that on the basis of the system catalog entries seems
> quite hopeless.  What's in the catalogs is essentially what appears
> in the CREATE command, ie
> dictfile = 'italian_ispell', afffile = 'italian_ispell', stopwords = 'italian_ispell'
> The dictionary template knows which of these options are file names and
> which are not, and what filename extension to apply to each option that
> is a file name; but you don't.
> The closest that I think pg_upgrade could reasonably come is to compare
> the contents of the old and new installations' tsearch_data/
> directories, and complain about any files present in the former and not
> the latter.  However, that method seems fraught with opportunities for
> false positives: in particular you might complain about some file that
> was in the old installation but not actually referenced by any text
> search catalog entry.
> In the end I'm not sure it's worth it.  There are any number of ways
> that the restore step can fail, and it's impossible for pg_upgrade
> to pre-check for all of them.

Agreed.  Not worth it.  If it is reported again, we can document this

  Bruce Momjian  <bruce(at)momjian(dot)us>

  + It's impossible for everything to be true. +

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