From: daveg <daveg@sonic.net>
To: Alvaro Herrera <alvherre@commandprompt.com>
Cc: Heikki Linnakangas <heikki.linnakangas@enterprisedb.com>
Cc: Maxim Boguk <maxim.boguk@gmail.com>
Cc: Fujii Masao <masao.fujii@gmail.com>
Cc: pgsql-admin <pgsql-admin@postgresql.org>
Cc: PostgreSQL-development <pgsql-hackers@postgresql.org>
Subject: Re: [HACKERS] Re: PD_ALL_VISIBLE flag was incorrectly set happend during repeatable vacuum
Date: Wed, 2 Mar 2011 15:53:54 -0800
Message-ID: <20110302235354.GP26397@sonic.net> (raw)
In-Reply-To: <1299101996-sup-4206@alvh.no-ip.org>
References: <AANLkTino+Gc2vvOVdzCPRRXW-N7R5=ikYMnNKT5W=mk1@mail.gmail.com>
<AANLkTikw==USr3+4Mt+w97P3ymux-Bhn0G7Ad0ZJHbqG@mail.gmail.com>
<4D2D6A56.9060808@enterprisedb.com>
<20110228212832.GH26397@sonic.net>
<4D6C1B16.6030708@enterprisedb.com>
<20110301212043.GN26397@sonic.net>
<20110302213034.GO26397@sonic.net>
<1299101996-sup-4206@alvh.no-ip.org>
On Wed, Mar 02, 2011 at 06:45:13PM -0300, Alvaro Herrera wrote:
> Excerpts from daveg's message of mié mar 02 18:30:34 -0300 2011:
>
> > After a restart and vacuum of all dbs with no other activity things were
> > quiet for a couple hours and then we started seeing these PD_ALL_VISIBLE
> > messages again.
> >
> > Going back through the logs we have been getting these since at least before
> > mid January. Oddly, this only happens on four systems which are all new Dell
> > 32 core Nehalem 512GB machines using iscsi partitions served off a Netapp.
> > Our older 8 core 64GB hosts have never logged any of these errors. I'm not
> > saying it is related to the hw, as these hosts are doing a lot more work than
> > the old hosts so it may be a concurrency problem that just never came up at
> > lower levels before.
> >
> > Postgresql version is 8.4.4.
>
> I don't see how this could be related, but since you're running on NFS,
> maybe it is, somehow:
> http://archives.postgresql.org/message-id/4D40DDB7.1010000@credativ.com
> (for example what if the visibility map fork's last page is overwritten?)
Running on ISCSI, not nfs. But it is still a Netapp, so who knows. I'll look.
Also, we are not seeing any of the "unexpected data beyond EOF" errors,
just thousands per day of the PD_ALL_VISIBLE error.
-dg
--
David Gould daveg@sonic.net 510 536 1443 510 282 0869
If simplicity worked, the world would be overrun with insects.
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To: pgsql-admin@postgresql.org
Cc: daveg@sonic.net, alvherre@commandprompt.com, heikki.linnakangas@enterprisedb.com, maxim.boguk@gmail.com, masao.fujii@gmail.com, pgsql-hackers@postgresql.org
Subject: Re: [HACKERS] Re: PD_ALL_VISIBLE flag was incorrectly set happend during repeatable vacuum
In-Reply-To: <20110302235354.GP26397@sonic.net>
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