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From: Tom Lane <[email protected]>
To: [email protected]
Cc: Adrian Klaver <[email protected]>
Cc: PostgreSQL General <[email protected]>
Cc: Chris Wilson <[email protected]>
Subject: Re: Streaming replica hangs periodically for ~ 1 second - how to diagnose/debug
Date: Fri, 22 Aug 2025 11:21:22 -0400
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>
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hubert depesz lubaczewski <[email protected]> writes:
> I got repeatable case today. Is is breaking on its own everyy
> ~ 5 minutes.

Interesting.  That futex call is presumably caused by interaction
with some other process within the standby server, and the only
plausible candidate really is the startup process (which is replaying
WAL received from the primary).  There are cases where WAL replay
will take locks that can block queries on the standby.  Can you
correlate the delays on the standby server with any DDL events
occurring on the primary?

			regards, tom lane

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