Re: make MaxBackends available in _PG_init

On Tue, Apr 12, 2022 at 01:08:35PM +0800, Julien Rouhaud wrote:
> It looks sensible to me, although I think I would apply 0003 before 0002.

Great.

> +   if (process_shared_preload_libraries_in_progress &&
> +       !allow_when_loading_preload_libs)
> +       ereport(ERROR,
> +               (errcode(ERRCODE_CANT_CHANGE_RUNTIME_PARAM),
> +                errmsg("cannot change parameters while loading "
> +                       "\"shared_preload_libraries\"")));
> +
> 
> I think the error message should mention at least which GUC is being modified.

My intent was to make it clear that no parameters can be updated while
loading s_p_l, but I agree that we should mention the specific GUC
somewhere.  Maybe this could go in a hint?

-- 
Nathan Bossart
Amazon Web Services: https://aws.amazon.com