Re: fsync-pgdata-on-recovery tries to write to more files than previously

On May 24, 2015 7:52:53 AM PDT, Tom Lane <tgl@sss.pgh.pa.us> wrote:
>Christoph Berg <myon@debian.org> writes:
>> Re: To Andres Freund 2015-05-24 <20150524075244.GB27048@msg.df7cb.de>
>>> Re: Andres Freund 2015-05-24
><20150524005245.GD32396@alap3.anarazel.de>
>>>> How about, to avoid masking actual problems, we have a more
>>>> differentiated logic for the toplevel data directory?
>
>> pg_log/ is also admin domain. What about only recursing into
>> well-known directories + postgresql.auto.conf?
>
>The idea that this code would know exactly what's what under $PGDATA
>scares me.  I can positively guarantee that it would diverge from
>reality
>over time, and nobody would notice until it ate their data, failed to
>start, or otherwise behaved undesirably.
>
>pg_log/ is a perfect example, because that is not a hard-wired
>directory
>name; somebody could point the syslogger at a different place very
>easily.
>Wiring in special behavior for that name is just wrong.
>
>I would *much* rather have a uniform rule for how to treat each file
>the scan comes across.  It might take some tweaking to get to one that
>works well; but once we did, we could have some confidence that it
>wouldn't break later.

If we'd merge it with initdb's list I think I'd not be that bad. I'm thinking of some header declaring it, roughly like
thermgr list.
 

Andres

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