Re: pg_upgrade: when the --old-bindir requires "additional" $libdir/ plugins?

On 04/18/2018 07:22 AM, Tom Lane wrote:
> Pavel Raiskup <praiskup(at)redhat(dot)com> writes:
>> . and it seems like the hstore.so was somewhat intimately integrated into
>> OP's database so the '/usr/bin/pg_dump --schema-only --binary-upgrade
>> --format=custom' called through 'pg_upgrade' failed with:
>> pg_dump: [archiver (db)] query failed: ERROR: could not access file
>> "$libdir/hstore": No such file or directory
>> Which means that the dump from old datadir, with old server (without
>> hstore.so packaged) failed. But playing with hstore.so a bit, the upgrade
>> always worked smoothly for me even without the "old" hstore.so
>
> Hi Pavel,
>
> There are certainly plenty of reasons why extension .so's might be needed
> during pg_dump, even in a binary-upgrade situation. The first example
> that comes to mind is that an hstore-type constant appearing in a view
> definition would require hstore_out() to be invoked while dumping the view
> definition.

I am obviously missing something. If the old server was using hstore in
a database how could hstore.so could be accessible to it but not pg_dump?

>
> I don't remember anymore whether I'd set up the postgresql-update package
> to include the contrib modules for the old server version. If I didn't,
> it was an oversight :-(.
>
> regards, tom lane
>
>

--
Adrian Klaver
adrian(dot)klaver(at)aklaver(dot)com