On Tue, Jan 13, 2015 at 4:41 PM, Peter Eisentraut <pete...@gmx.net> wrote:
> I think the key point I'm approaching is that the information should
> only ever be in one place, all the time.  This is not dissimilar from
> why we took the tablespace location out of the system catalogs.  Users
> might have all kinds of workflows for how they back up, restore, and
> move their tablespaces.  This works pretty well right now, because the
> authoritative configuration information is always in plain view.  The
> proposal is essentially that we add another location for this
> information, because the existing location is incompatible with some
> operating system tools.  And, when considered by a user, that second
> location might or might not collide with or overwrite the first location
> at some mysterious times.
> So I think the preferable fix is not to add a second location, but to
> make the first location compatible with said operating system tools,
> possibly in the way I propose above.

I see.  I'm a little concerned that following symlinks may be cheaper
than whatever system we would come up with for caching the
tablespace-name-to-file-name mappings.  But that concern might be
unfounded, and apart from it I have no reason to oppose your proposal,
if you want to do the work.

Robert Haas
EnterpriseDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company

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