Re: snapshot too old issues, first around wraparound and then more.

On Tue, Jun 15, 2021 at 11:24 PM Noah Misch <noah(at)leadboat(dot)com> wrote:
> When I say "some hackers", I don't mean that specific people think such
> thoughts right now. I'm saying that the expected cost of future cooperation
> with the feature is nonzero, and bugs in the feature raise that cost.

I see.

> > > A hacker adopting the feature would be aiming to reduce (2)(b) to zero,
> > > essentially. What other interests are relevant?
> >
> > The code simply isn't up to snuff. If the code was in a niche contrib
> > module then maybe it would be okay to let this slide. But the fact is
> > that it touches critical parts of the system. This cannot be allowed
> > to drag on forever. It's as simple as that.
>
> Even if we were to stipulate that this feature "isn't up to snuff", purging
> PostgreSQL of substandard features may or may not add sufficient value to
> compensate for (1) and (4).

I'm more concerned about 1 (compatibility) than about 4 (perception
that we deprecate things when we shouldn't), FWIW.

It's not that this is a substandard feature in the same way that (say)
contrib/ISN is a substandard feature -- it's not about the quality
level per se. Nor is it the absolute number of bugs. The real issue is
that this is a substandard feature that affects crucial areas of the
system. Strategically important things that we really cannot afford to
break.

--
Peter Geoghegan