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From: Tomas Vondra <tomas.vondra@2ndquadrant.com>
To: Thomas Munro <thomas.munro@gmail.com>
Cc: Stephen Frost <sfrost@snowman.net>
Cc: Dmitry Dolgov <9erthalion6@gmail.com>
Cc: David Steele <david@pgmasters.net>
Cc: Andres Freund <andres@anarazel.de>
Cc: Alvaro Herrera <alvherre@2ndquadrant.com>
Cc: pgsql-hackers <pgsql-hackers@postgresql.org>
Subject: Re: WIP: WAL prefetch (another approach)
Date: Tue, 1 Sep 2020 16:18:26 +0200
Message-ID: <20200901141826.gbhqz664brtt4y2t@development> (raw)
In-Reply-To: <CA+hUKG+9NUUbdQqFNCz2SKBdyCCD7SQwJy-Y6_PZmCnc+h79ig@mail.gmail.com>
References: <CA+hUKG+obB-e_VFa2uPVe52DvtpBQtC30vyo_PDURJQTr3SdJQ@mail.gmail.com>
	<20200605223422.r76a5rpl2zg2xo34@development>
	<20200606003632.GS6680@tamriel.snowman.net>
	<CA+hUKG+oXRpmc=yOM-GCQMt+Q4GPt9dD_idhPhFVf6f=_owwvA@mail.gmail.com>
	<20200803154659.nzf5qzuozts5dujp@development>
	<CA+hUKGKfsWj+4qPfOkC4YtYtVO33yrCty1uWxBp3R1OSqWEcyA@mail.gmail.com>
	<20200806104701.j3xnkczd6qelfnhj@development>
	<CA+hUKGKciMMJbE-1+9oPKte977b++UU_X16kkOXTF_7QjP4+jA@mail.gmail.com>
	<20200901131426.5lse2jlepm3uligv@development>
	<CA+hUKG+9NUUbdQqFNCz2SKBdyCCD7SQwJy-Y6_PZmCnc+h79ig@mail.gmail.com>

On Wed, Sep 02, 2020 at 02:05:10AM +1200, Thomas Munro wrote:
>On Wed, Sep 2, 2020 at 1:14 AM Tomas Vondra
><tomas.vondra@2ndquadrant.com> wrote:
>> from the archive
>
>Ahh, so perhaps that's the key.
>

Maybe. For the record, the commands look like this:

archive_command = 'gzip -1 -c %p > /mnt/raid/wal-archive/%f.gz'

restore_command = 'gunzip -c /mnt/raid/wal-archive/%f.gz > %p.tmp && mv %p.tmp %p'

>> I've tested this applied on 6ca547cf75ef6e922476c51a3fb5e253eef5f1b6,
>> and the failure seems fairly similar to what I reported before, except
>> that now it happened right at the very beginning.
>
>Thanks, will see if I can work out why.  My newer version probably has
>the same problem.

OK.


regards

-- 
Tomas Vondra                  http://www.2ndQuadrant.com
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services





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