Re: Re: [COMMITTERS] pgsql: Map basebackup tablespaces using a tablespace_map file

On 05/14/2015 10:52 AM, Robert Haas wrote:
> On Thu, May 14, 2015 at 12:12 AM, Amit Kapila <amit(dot)kapila16(at)gmail(dot)com> wrote:
>> On Thu, May 14, 2015 at 2:10 AM, Andrew Dunstan <andrew(at)dunslane(dot)net> wrote:
>>> How about if we simply abort if we find a non-symlink where we want the
>>> symlink to be, and only remove something that is actually a symlink (or a
>>> junction point, which is more or less the same thing)?
>> We can do that way and for that I think we need to use rmdir
>> instead of rmtree in the code being discussed (recovery path),
>> OTOH we should try to minimize the errors raised during
>> recovery.
> I'm not sure I understand this issue in detail, but why would using
> rmtree() on something you expect to be a symlink ever be a good idea?
> It seems like if things are the way you expect them to be, it has no
> benefit, but if they are different from what you expect, you might
> blow away a ton of important data.
>
> Maybe I am just confused.
>

The suggestion is to get rid of using rmtree. Instead, if we find a
non-symlink in pg_tblspc we'll make the user clean it up before we can
continue. So your instinct is in tune with my suggestion.

cheers

andrew