From: Tom Lane <tgl@sss.pgh.pa.us>
To: Alvaro Herrera <alvherre@alvh.no-ip.org>
Cc: Michael Paquier <michael@paquier.xyz>
Cc: pgsql-hackers@lists.postgresql.org
Subject: Re: Odd, intermittent failure in contrib/pageinspect
Date: Mon, 18 Jan 2021 17:47:40 -0500
Message-ID: <416876.1611010060@sss.pgh.pa.us> (raw)
In-Reply-To: <20210118224005.GA3146@alvherre.pgsql>
References: <20210118224005.GA3146@alvherre.pgsql>
Alvaro Herrera <alvherre@alvh.no-ip.org> writes:
> On 2021-Jan-18, Tom Lane wrote:
>> [ thinks for a bit... ] Does the checkpointer pin pages it's writing
>> out? I guess it'd have to ...
> It does, per SyncOneBuffer(), called from BufferSync(), called from
> CheckPointBuffers().
Right, then we don't need any strange theories about autovacuum,
just bad timing luck. whelk does seem pretty slow, so it's not
much of a stretch to imagine that it's more susceptible to this
corner case than faster machines.
So, do we have any other tests that are invoking a manual vacuum
and assuming it won't skip any pages? By this theory, they'd
all be failures waiting to happen.
regards, tom lane
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To: pgsql-hackers@postgresql.org
Cc: tgl@sss.pgh.pa.us, alvherre@alvh.no-ip.org, michael@paquier.xyz, pgsql-hackers@lists.postgresql.org
Subject: Re: Odd, intermittent failure in contrib/pageinspect
In-Reply-To: <416876.1611010060@sss.pgh.pa.us>
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