Re: pgsql: Teach DSM registry to ERROR if attaching to an uninitialized ent

On Mon, Nov 24, 2025 at 2:03 PM Nathan Bossart <nathandbossart@gmail.com> wrote:
> I think 0002 was more complicated than necessary.  Here's a second try.

I haven't done a full review of this and I'm not sure whether you want
me to spend more time on it, but something I notice about this version
is that the PG_CATCH() blocks only contain dshash_delete_entry()
calls. That seems good, because that means that all the other cleanup
is being handled by transaction abort (assuming that the patch isn't
buggy, which I haven't attempted to verify). However, it does make me
wonder if we could also find a way to postpone adding the dshash
entries so that we don't need to do anything in PG_CATCH() blocks at
all. I'm guessing that the reason why that doesn't easily work is
because you're relying on those locks to prevent multiple backends
from doing the same initialization?

--
Robert Haas
EDB: http://www.enterprisedb.com