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From: Nathan Bossart <nathandbossart@gmail.com>
To: Tom Lane <tgl@sss.pgh.pa.us>
Cc: Melih Mutlu <m.melihmutlu@gmail.com>
Cc: Thomas Munro <thomas.munro@gmail.com>
Cc: Hayato Kuroda (Fujitsu) <kuroda.hayato@fujitsu.com>
Cc: pgsql-hackers@postgresql.org <pgsql-hackers@postgresql.org>
Subject: Re: wake up logical workers after ALTER SUBSCRIPTION
Date: Tue, 13 Dec 2022 16:41:05 -0800
Message-ID: <20221214004105.GA669835@nathanxps13> (raw)
In-Reply-To: <2561155.1670977214@sss.pgh.pa.us>
References: <20221202002130.GA2124877@nathanxps13>
	<20221202192101.GB2277157@nathanxps13>
	<CAGPVpCTUuKyxB5f3exgDMBRTivbN5uHVkD=YfXmgznrdnwVOQw@mail.gmail.com>
	<20221206192551.GA3078082@nathanxps13>
	<20221206212954.GA3403597@nathanxps13>
	<CAGPVpCTkdaOyBLXB435VXq0RA1cHLFQut7BPm6t8D4dsdiEXZQ@mail.gmail.com>
	<20221207181145.GA3698731@nathanxps13>
	<2550453.1670974328@sss.pgh.pa.us>
	<20221214000145.GA638663@nathanxps13>
	<2561155.1670977214@sss.pgh.pa.us>

On Tue, Dec 13, 2022 at 07:20:14PM -0500, Tom Lane wrote:
> I certainly don't think that "wake the apply launcher every 1ms"
> is a sane configuration.  Unless I'm missing something basic about
> its responsibilities, it should seldom need to wake at all in
> normal operation.

This parameter appears to control how often the apply launcher starts new
workers.  If it starts new workers in a loop iteration, it updates its
last_start_time variable, and it won't start any more workers until another
wal_retrieve_retry_interval has elapsed.  If no new workers need to be
started, it only wakes up every 3 minutes.

-- 
Nathan Bossart
Amazon Web Services: https://aws.amazon.com





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