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help / color / mirror / Atom feedFrom: Nathan Bossart <[email protected]>
To: Tom Lane <[email protected]>
Cc: Melih Mutlu <[email protected]>
Cc: Thomas Munro <[email protected]>
Cc: Hayato Kuroda (Fujitsu) <[email protected]>
Cc: [email protected] <[email protected]>
Subject: Re: wake up logical workers after ALTER SUBSCRIPTION
Date: Sun, 18 Dec 2022 15:36:07 -0800
Message-ID: <20221218233607.GB1476904@nathanxps13> (raw)
In-Reply-To: <20221215224721.GA694065@nathanxps13>
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On Thu, Dec 15, 2022 at 02:47:21PM -0800, Nathan Bossart wrote:
> I tried setting wal_retrieve_retry_interval to 1ms for all TAP tests
> (similar to what was done in 2710ccd), and I noticed that the recovery
> tests consistently took much longer. Upon further inspection, it looks
> like the same (or a very similar) race condition described in e5d494d's
> commit message [0]. With some added debug logs, I see that all of the
> callers of MaybeStartWalReceiver() complete before SIGCHLD is processed, so
> ServerLoop() waits for a minute before starting the WAL receiver.
>
> A simple fix is to have DetermineSleepTime() take the WalReceiverRequested
> flag into consideration. The attached 0002 patch shortens the sleep time
> to 100ms if it looks like we are waiting on a SIGCHLD. I'm not certain
> this is the best approach, but it seems to fix the tests.
This seems to have somehow broken the archiving tests on Windows, so
obviously I owe some better analysis here. I didn't see anything obvious
in the logs, but I will continue to dig.
--
Nathan Bossart
Amazon Web Services: https://aws.amazon.com
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Subject: Re: wake up logical workers after ALTER SUBSCRIPTION
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