On Tue, Jan 6, 2015 at 4:33 PM, Peter Eisentraut <pete...@gmx.net> wrote:
> Currently, when you unpack a tarred basebackup with tablespaces, the
> symlinks will tell you whether you have unpacked the tablespace tars at
> the right place.  Otherwise, how do you know?  Secondly, you also have
> the option of putting the tablespaces somewhere else by changing the
> symlinks.

That's a good argument for making the tablespace-map file
human-readable and human-editable, but I don't think it's an argument
for duplicating its contents inaccurately in the filesystem.

> One way to address this would be to do away with the symlinks altogether
> and have pg_tblspc/12345 be a text file that contains the tablespace
> location.  Kind of symlinks implemented in user space.

Well, that's just spreading the tablespace-map file out into several
files, and maybe keeping it around after we've restored from backup.

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

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