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From: Nathan Bossart <nathandbossart@gmail.com>
To: Jelte Fennema-Nio <postgres@jeltef.nl>
Cc: Robert Haas <robertmhaas@gmail.com>
Cc: Fujii Masao <masao.fujii@oss.nttdata.com>
Cc: pgsql-hackers@lists.postgresql.org
Subject: Re: Add a GUC check hook to ensure summarize_wal cannot be enabled when wal_level is minimal
Date: Wed, 10 Jul 2024 09:46:41 -0500
Message-ID: <Zo6e0RkGFGzf3Ehd@nathan> (raw)
In-Reply-To: <CAGECzQQcLYiAdRj5xAm1G43MtpD_rm029ziqrbpqyDdxaCoEQA@mail.gmail.com>
References: <6e30082e-041b-4e31-9633-95a66de76f5d@oss.nttdata.com>
	<ZoVgXuYWbzTLXyRY@nathan>
	<802ff3d5-fdc7-4b08-9046-2e9fc5fdae0e@oss.nttdata.com>
	<CA+TgmoYPNfgAT3OubjoYSiXTb3-urOjQxT3SCEUCrRBx5g6ihA@mail.gmail.com>
	<CA+TgmoY8DnzWNK_xu4=NTYdxGBGnFucrEpOALnS0awMp-s_pKQ@mail.gmail.com>
	<7c1b48d8-0f08-4733-a4e6-d55f04581db7@oss.nttdata.com>
	<CA+TgmoansG0B8ayQGw9Ozee6Jawz=HFUACpO_4gp-+SFJBxiYw@mail.gmail.com>
	<Zo6YPuvTmRW3b1s7@nathan>
	<CAGECzQQcLYiAdRj5xAm1G43MtpD_rm029ziqrbpqyDdxaCoEQA@mail.gmail.com>

On Wed, Jul 10, 2024 at 04:29:14PM +0200, Jelte Fennema-Nio wrote:
> On Wed, 10 Jul 2024 at 16:18, Nathan Bossart <nathandbossart@gmail.com> wrote:
>> Yeah.  I initially thought this patch might be okay, at least as a stopgap,
>> but Jelte pointed out a case where it doesn't work, namely when you have
>> something like the following in the config file:
>>
>>         wal_level = 'minimal'
>>         summarize_wal = 'true'
>>         wal_level = 'logical'
> 
> I think that issue can be solved fairly easily by making the guc
> check_hook always pass during postmaster startup (by e.g. checking
> pmState), and relying on the previous startup check instead during
> startup.

I was actually just thinking about doing something similar in a different
thread [0].  Do we actually need to look at pmState?  Or could we just skip
it if the context is <= PGC_S_ARGV?

[0] https://postgr.es/m/Zow-DBaDY2IzAzA2%40nathan

-- 
nathan





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