Date: Tue, 20 Jan 2015 18:42:49 +0000 (UTC)
From: Glyn Astill <glynastill@yahoo.co.uk>
Reply-To: Glyn Astill <glynastill@yahoo.co.uk>
To: John Scalia <jayknowsunix@gmail.com>,
 "pgsql-admin@postgresql.org" <pgsql-admin@postgresql.org>
Message-ID: 
 <798882007.4385422.1421779369077.JavaMail.yahoo@jws11176.mail.ir2.yahoo.com>
In-Reply-To: <54BE9AA9.8040608@gmail.com>
References: <54BE9AA9.8040608@gmail.com>
Subject: Re: cannot drop an extension
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----- Original Message -----
> From: John Scalia <jayknowsunix@gmail.com>
> To: "pgsql-admin@postgresql.org" <pgsql-admin@postgresql.org>
> Cc: 
> Sent: Tuesday, 20 January 2015, 18:12
> Subject: [ADMIN] cannot drop an extension
> 
> Hi all,
> 
> My pg_upgrade woes continue... The primary server, V9.3.3, was originally used 
> as a testbed for pgpool-II, although we ended up chosing pacemaker and corosync 
> instead. When pgpool 
> was installed, the instructions have you add a pgpool-regclass extension. 
> Naturally, trying to upgrade to V9.4.0 fails and pg_upgrade writes a 
> loadable_libraries.txt saying that 
> $libdir/pgpool-regclass cannot be found. So, I restarted the original database, 
> and connected to both my csg_db instance and to the template1 instance, then 
> tried issuing a "drop 
> extension pgpool-reglass", but the both the db's say it does not exist. 
> I also tried dropping it by enclosing the extension name in quotes, both single 
> and double with no joy. 
> Then, I tried looking in pg_extensions, but I didn't see any similar entry 
> there either. How can I get rid of this extension so that pg_upgrade will 
> complete successfully? I've 
> asked on the pgpool admin list, but as it's the middle of the night in 
> Japan, I'm not expecting an immediate answer, if any.


Sounds like you need to remove the pgpool-regclass entry from the shared_preload_libraries entry in your postgresql.conf


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