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From: Tomas Vondra <tomas.vondra@enterprisedb.com>
To: Thomas Munro <thomas.munro@gmail.com>
To: Tomas Vondra <tomas.vondra@2ndquadrant.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: Fri, 13 Nov 2020 11:45:51 +0100
Message-ID: <5437ce5b-d305-bd85-23ec-ddb15735d93f@enterprisedb.com> (raw)
In-Reply-To: <CA+hUKGJwuzYCLxCP7QpK54uHBxEDGNcnDF4CJuJnuvFDpn4h5A@mail.gmail.com>
References: <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>
	<20200901141826.gbhqz664brtt4y2t@development>
	<CA+hUKGLr6nU7yb8CO7_DEppBmPCOkCUvE6HBza8himYV_s5nuQ@mail.gmail.com>
	<20200908231235.lsgat5ni35h6odqt@development>
	<CA+hUKG+2Vw3UAVNJSfz5_zhRcHUWEBDrpB7pyQ85Yroep0AKbw@mail.gmail.com>
	<CA+hUKGJyuSTC5sXTv-2FmtjfFPYFU8t8JPnhV4jdMKmuKJ4tHw@mail.gmail.com>
	<20201010112935.qrhm572v4djrjljo@development>
	<CA+hUKGJwuzYCLxCP7QpK54uHBxEDGNcnDF4CJuJnuvFDpn4h5A@mail.gmail.com>

On 11/13/20 3:20 AM, Thomas Munro wrote:
>
> ...
> 
> I'm not really sure what to do about achive restore scripts that
> block.  That seems to be fundamentally incompatible with what I'm
> doing here.
> 

IMHO we can't do much about that, except for documenting it - if the
prefetch can't work because of blocking restore script, someone has to
fix/improve the script. No way around that, I'm afraid.

regards

-- 
Tomas Vondra
EnterpriseDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company





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