On 05/27/2012 02:32 PM, Tom Lane wrote:
> Andrew Dunstan<andrew@dunslane.net> writes:
>> AIUI, for Tom's scheme to work pg_upgrade would need not to check
>> libraries that belonged to extension functions. Currently it simply
>> assumes that what is present in the old cluster is exactly what will be
>> needed in the new cluster. Tom's proposed scheme would completely
>> invalidate that assumption (which I would argue is already of doubtful
>> validity). Instead of explicitly trying to LOAD the libraries it would
>> have to rely on the "CREATE EXTENSION foo" failing, presumably at some
>> time before it would be too late to abort.
> Well, the scheme I had in mind would require pg_upgrade to verify that
> the new cluster contains an extension control file for each extension in
> the old cluster (which is something it really oughta do anyway, if it
> doesn't already). After that, though, it ought not be looking at the
> individual functions defined by an extension --- it is the extension's
> business which libraries those are in.
>
Yeah, that makes sense.
cheers
andrew