From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
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To: | Bruce Momjian <bruce(at)momjian(dot)us> |
Cc: | Dimitri Fontaine <dfontaine(at)hi-media(dot)com>, Magnus Hagander <magnus(at)hagander(dot)net>, Josh Berkus <josh(at)agliodbs(dot)com>, Andrew Dunstan <andrew(at)dunslane(dot)net>, Brad Nicholson <bnichols(at)ca(dot)afilias(dot)info>, pgsql-hackers(at)postgresql(dot)org |
Subject: | Re: pg_migrator issue with contrib |
Date: | 2009-06-08 16:51:44 |
Message-ID: | 29068.1244479904@sss.pgh.pa.us |
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Lists: | pgsql-hackers |
Bruce Momjian <bruce(at)momjian(dot)us> writes:
> Tom Lane wrote:
>> There is a different problem though: sometimes the recommended fix for
>> contrib-module incompatibilities is to load the new contrib module into
>> the target database before trying to load your old dump file. (We told
>> people to do that for 8.2->8.3 tsearch2, for example.) In the
>> pg_migrator context there is no way to insert the new contrib module
>> first, and also no way to ignore the duplicate-object errors that you
>> typically get while loading the old dump.
> Ah, OK, interesting. We could have pg_migrator detect this issue and
> fail right away with a message indicating pg_migrator cannot be used
> unless those objects are dumped manually and the /contrib removed.
How would it detect it? I think the only thing you could do is
hard-wire tests for specific objects, which is klugy and doesn't
extend to third-party modules that you don't know about.
In most cases where there are major incompatibilities, attempting to
load the old dump file would fail anyway, so I don't think pg_migrator
really needs any hard-wired test. It's the minor changes that are
risky. I think ultimately the burden for those has to be on the module
author: he has to either avoid cross-version incompatibilities or make
sure they will fail safely.
regards, tom lane
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