pg_upgrade skipping the modules makes the most sense to me as well.
On Mon, Aug 31, 2015 at 4:32 PM, Bruce Momjian <bruce@momjian.us> wrote:
On Mon, Aug 31, 2015 at 07:28:00PM -0400, Andrew Dunstan wrote: > > > On 08/31/2015 07:21 PM, David E. Wheeler wrote: > >On Aug 31, 2015, at 4:20 PM, Bruce Momjian <bruce@momjian.us> wrote: > > > >>>I think it would help if its noted somewhere in the document as it would have > >>>helped us save some time understanding why it was failing and why it was > >>>looking for json_build. > >>The problem is that this is a rare case where you had an extension that > >>was later included in Postgres. > >Maybe not so rare. Thanks to Andrew, we’ve had to do this for both 9.2-9.3 (json_object) and 9.3-9.4 (json_build). > > > > > Yeah, a lot of people don't like to wait for new stuff. :-)
It might make the most sense to mention this method in the release notes of the extension. However, I assume they are not using the extension in the new server so their is no release to look at.
Still, I don't know how many people are doing this, but the right fix is to get the names of the modules that are superceeded and tell pg_upgrade to skip them.