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From: Tom Lane <[email protected]>
To: Andres Freund <[email protected]>
Cc: Thomas Munro <[email protected]>
Cc: PostgreSQL Hackers <[email protected]>
Subject: Re: subscriptionCheck failures on nightjar
Date: Wed, 13 Feb 2019 13:24:03 -0500
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>
References: <[email protected]>
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Andres Freund <[email protected]> writes:
> On 2019-02-13 12:59:19 -0500, Tom Lane wrote:
>> Perhaps more to the point, the way this was coded, the PANIC applies
>> to open() failures in fsync_fname_ext() not just fsync() failures;
>> that's painting with too broad a brush isn't it?

> That indeed seems wrong. Thomas?  I'm not quite sure how to best fix
> this though - I guess we could rename fsync_fname_ext's eleval parameter
> to fsync_failure_elevel? It's not visible outside fd.c, so that'd not be
> to bad?

Perhaps fsync_fname() should pass the elevel through as-is, and
then fsync_fname_ext() apply the data_sync_elevel() promotion only
to the fsync() call not the open()?  I'm not sure.

The bigger picture here is that there are probably some call sites where
PANIC on open() failure is appropriate too.  So having fsync_fname[_ext]
deciding what to do on its own is likely to be inadequate.

If we fix this by allowing ENOENT to not be an error in this particular
call case, that's going to involve an fsync_fname_ext API change anyway...

			regards, tom lane

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