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From: Tom Lane <tgl@sss.pgh.pa.us>
To: Andres Freund <andres@anarazel.de>
Cc: Fujii Masao <masao.fujii@oss.nttdata.com>
Cc: Alexey Kondratov <a.kondratov@postgrespro.ru>
Cc: Kyotaro Horiguchi <horikyota.ntt@gmail.com>
Cc: a.akenteva@postgrespro.ru
Cc: a.korotkov@postgrespro.ru
Cc: i.kartyshov@postgrespro.ru
Cc: amit.kapila16@gmail.com
Cc: pgsql-hackers@lists.postgresql.org
Subject: Re: [HACKERS] make async slave to wait for lsn to be replayed
Date: Fri, 10 Apr 2020 16:29:39 -0400
Message-ID: <32218.1586550579@sss.pgh.pa.us> (raw)
In-Reply-To: <20200410193301.2qsbuoieppkst7xj@alap3.anarazel.de>
References: <20200408.100945.375702947246835193.horikyota.ntt@gmail.com>
	<d3ff2e363af60b345f82396992595a03@postgrespro.ru>
	<13716.1586378146@sss.pgh.pa.us>
	<20200409.161107.580344062273684114.horikyota.ntt@gmail.com>
	<880834ee-4b18-6d5d-9dae-6520c5eb2bef@oss.nttdata.com>
	<27171.1586439221@sss.pgh.pa.us>
	<a8bff0350a27e0a87a6eaf0905d6737f@postgrespro.ru>
	<759206c1-265f-97da-d135-fcecbced646b@oss.nttdata.com>
	<20200410193301.2qsbuoieppkst7xj@alap3.anarazel.de>

Andres Freund <andres@anarazel.de> writes:
> I don't think a function is a good idea - it'll cause a snapshot to be
> held while waiting. Which in turn will cause hot_standby_feedback to not
> be able to report an increased xmin up. And it will possibly hit
> snapshot recovery conflicts.

Good point, but we could address that by making it a procedure no?

			regards, tom lane





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