From: | Robert Haas <robertmhaas(at)gmail(dot)com> |
---|---|
To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
Cc: | Stephen Frost <sfrost(at)snowman(dot)net>, Bruce Momjian <bruce(at)momjian(dot)us>, Dave Cramer <pg(at)fastcrypt(dot)com>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org> |
Subject: | Re: create tablespace fails silently, or succeeds improperly |
Date: | 2010-12-11 18:23:10 |
Message-ID: | AANLkTikRpjxw6m0TPi+sYtGdrO0xaaAGcFgkVXjRrKjS@mail.gmail.com |
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Lists: | pgsql-hackers |
On Sat, Dec 11, 2010 at 1:20 PM, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:
> Robert Haas <robertmhaas(at)gmail(dot)com> writes:
>> On Sat, Dec 11, 2010 at 10:56 AM, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:
>>> OK. Is there any value in doing mkdir -p in WAL-recovery execution of
>>> CREATE TABLESPACE but not regular execution?
>
>> I don't think so. If someone creates a directory that is not fsync'd,
>> and then creates a subdirectory and puts a tablespace on it, and then
>> crashes after this has been WAL-logged but before the directory
>> entries have hit the disk, well, unlucky for them, but that's a
>> vanishingly rare situation.
>
> I'm not really thinking about crash recovery, but replication slaves.
> Omitting to create the tablespace location directories on slaves
> doesn't seem far-fetched at all. Of course, it's likely that
> the slave server will lack permissions to create in the location
> directory's parent; but if it can, the outcome shouldn't be too
> unreasonable.
Creating the tablespace directory itself would be reasonable, but
recursing all the way up seems dubious.
--
Robert Haas
EnterpriseDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company
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