Re: BUG #15350: Getting invalid cache ID: 11 Errors

Yes I'm using extensions - A bunch of them but I'm guessing it's
likely ogr_fdw that will be causing the issue as I've only seen this on
days when someone has imported data using ogr_fdw.

On Tue, 28 Aug 2018, 03:40 Tom Lane, <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:

> Thomas Munro <thomas(dot)munro(at)enterprisedb(dot)com> writes:
> > We could probably improve that situation by making syscache lookups
> > (and probably other things too) fail when called from _PG_init() in
> > regular backends so that extension authors are made aware of this
> > hazard, or perhaps go the other way and change the order we do things
> > in parallel workers.
>
> Hmm. There's an argument to be made for the latter: we don't really
> want stuff failing in parallel workers if it works fine normally.
>
> On the other hand, it seems clear to me that we *don't* want extensions to
> be doing stuff like syscache lookups in _PG_init(), because that would
> prevent them from working as shared_preload_libraries entries.
>
> And on the third hand, intentionally breaking code that used to work
> isn't likely to win us many friends either. So I'm not sure that your
> first option is really tenable. Perhaps we could get away with doing
> it in HEAD and not back-patching ... but that does little for existing
> problems.
>
> regards, tom lane
>