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Re: pg_upgrade & tablespaces

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On 12/27/2013 06:50 AM, Joseph Kregloh wrote:

    So how are you moving the 9.0 directory?


Just using a mv command like below:
mv /usr/local/pgsql/data /usr/local/pgsql_90/data

Then I recreated the symlinks in /pg_tbspc to point to the new directory
path.


Ah, now I see the problem, I think. As was noted upstream having a user tablespace in the PGDATA would seem to be the issue.

If you do SELECT * from pg_tablespace in the 9.0 install before moving and after you will see that spclocation does not change and points to the original PGDATA/drupal_dbspace. Creating the Postgres 9.3 instance in the old location then basically slides the new under the old. This is where you get this error:

Copying user relation files
  .../pgsql/data/drupal_dbspace/PG_9.0_201008051/24659/11790
error while copying relation "pg_catalog.pg_largeobject" ("/usr/local/pgsql/data/drupal_dbspace/PG_9.0_201008051/24659/11790" to "/usr/local/pgsql/data/drupal_dbspace/PG_9.3_201306121/16421/12301"): No such file or directory
Failure, exiting

Postgres is going to /usr/local/pgsql/data/drupal_dbspace/ to look for the 9.0 files instead of /usr/local/pgsql_90/data/drupal_dbspace/ and is trying to copy them as 9.3 versions into the new default location which has the same path. Since the new /usr/local/pgsql/data/drupal_dbspace/PG_9.0_201008051 is empty it is failing.

Not sure of the best solution, others may have better ideas.

On thing that came to mind is to give pg_upgrade what it wants, the 9.0 tablespace in the default location(/usr/local/pgsql/data/drupal_dbspace/). In other words make a symlink:

 /usr/local/pgsql/data/drupal_dbspace/PG_9.0_201008051

to

/usr/local/pgsql_90/data/drupal_dbspace/PG_9.0_201008051

FYI, some testing showed that playing around with spclocation in pg_tablespace is not recommended.

--
Adrian Klaver
adrian.klaver@xxxxxxxxx


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