Subject: Re: pg_upgrade 8.3 to 9.0, shutdown is to slow
From: Bernhard Schrader <bernhard.schrader@innogames.de>
To: Bruce Momjian <bruce@momjian.us>
Cc: Scott Marlowe <scott.marlowe@gmail.com>,
	Kevin Grittner <Kevin.Grittner@wicourts.gov>, pgsql-admin@postgresql.org
In-Reply-To: <201101271709.p0RH9f421528@momjian.us>
References: <201101271709.p0RH9f421528@momjian.us>
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Organization: Innogames GmbH
Date: Thu, 27 Jan 2011 18:46:04 +0100
Message-ID: <1296150364.2330.15.camel@schrader-laptop>
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Am Donnerstag, den 27.01.2011, 12:09 -0500 schrieb Bruce Momjian:
> Scott Marlowe wrote:
> > > My initial reaction is that something is wrong with your system, either
> > > the I/O or the way it is being shutdown by the script. ?I would start to
> > > look in the script and do some pg_ctl tests starting/stopping the
> > > server.
> > 
> > It could be that his application or whatever is making connections
> > while he's trying to do this.  An open connection that's actually
> > doing something will stop a normal shutdown.
> > 
> > Is there a reason the pg upgrade script does not use -m fast?
> 
> Uh, well, I assume that the person has already shut down all db
> connections, and opened it only for super-users.  If the system is not
> shutting down, that should signal to the user that they have not locked
> down the system properly.  We would not want someone to connect during
> pg_upgrade processing, and doing -m fast is not going to help with that.
> 
> -- 
>   Bruce Momjian  <bruce@momjian.us>        http://momjian.us
>   EnterpriseDB                             http://enterprisedb.com
> 
>   + It's impossible for everything to be true. +
> 

Hi,

well, i shut down every client connection that could occur, but with a
ps auxf i get following output:

postgres 26255 0.0 0.0 426396 2044 ? Ss 14:21 0:00 \_ postgres: writer
process 
postgres 26257 0.0 0.0 154368 1616 ? Ss 14:21 0:00 \_ postgres: stats
collector process 
postgres 26258 0.0 0.1 427612 4188 ? Ss 14:21 0:00 \_ postgres: grepo
DB_NAME LOCAL_IP(PORT) idle

so there are some connections, but as far as i can say, nothing from a
client program, these connections belong to postgres itself??!? is that
possible? pg_upgrade has to check the tables anyway, so there must be
this connection, or am i wrong?!? 

greetz