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: Wed, 14 Dec 2022 09:45:35 -0800
Message-ID: <20221214174535.GA773264@nathanxps13> (raw)
In-Reply-To: <2707695.1671039752@sss.pgh.pa.us>
References: <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>
<20221214004105.GA669835@nathanxps13>
<20221214171023.GA689106@nathanxps13>
<2707695.1671039752@sss.pgh.pa.us>
On Wed, Dec 14, 2022 at 12:42:32PM -0500, Tom Lane wrote:
> Nathan Bossart <nathandbossart@gmail.com> writes:
>> My first thought is that the latter two uses should be moved to a new
>> parameter, and the apply launcher should store the last start time for each
>> apply worker like the apply workers do for the table-sync workers. In any
>> case, it probably makes sense to lower this parameter's value for testing
>> so that tests that restart these workers frequently aren't waiting for so
>> long.
>
>> I can put a patch together if this seems like a reasonable direction to go.
>
> No, I'm still of the opinion that waiting for the launcher to timeout
> before doing something is fundamentally wrong design. We should signal
> it when we want it to do something. That's not different from what
> you're fixing about the workers; why don't you see that it's appropriate
> for the launcher too?
I'm reasonably certain the launcher is already signaled like you describe.
It'll just wait to start new workers if it's been less than
wal_retrieve_retry_interval milliseconds since the last time it started
workers.
--
Nathan Bossart
Amazon Web Services: https://aws.amazon.com
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Reply to all the recipients using the --to and --cc options:
reply via email
To: pgsql-hackers@postgresql.org
Cc: nathandbossart@gmail.com, tgl@sss.pgh.pa.us, m.melihmutlu@gmail.com, thomas.munro@gmail.com, kuroda.hayato@fujitsu.com
Subject: Re: wake up logical workers after ALTER SUBSCRIPTION
In-Reply-To: <20221214174535.GA773264@nathanxps13>
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
This inbox is served by DDX for PostgreSQL; see mirroring instructions
for how to clone and mirror all data and code used for this inbox