RE: parallel vacuum comments

On Monday, December 13, 2021 2:12 PM Masahiko Sawada <sawada(dot)mshk(at)gmail(dot)com> wrote:
>
> On Mon, Dec 13, 2021 at 2:09 PM Amit Kapila <amit(dot)kapila16(at)gmail(dot)com> wrote:
> >
> > On Mon, Dec 13, 2021 at 10:33 AM Masahiko Sawada
> <sawada(dot)mshk(at)gmail(dot)com> wrote:
> > >
> > > On Fri, Dec 10, 2021 at 9:08 PM Amit Kapila <amit(dot)kapila16(at)gmail(dot)com>
> wrote:
> > > >
> > > > On Thu, Dec 9, 2021 at 6:05 PM Masahiko Sawada
> <sawada(dot)mshk(at)gmail(dot)com> wrote:
> > > > >
> > > > > On Thu, Dec 9, 2021 at 7:44 PM Amit Kapila <amit(dot)kapila16(at)gmail(dot)com>
> wrote:
> > > > >
> > > > > Agreed with the above two points.
> > > > >
> > > > > I've attached updated patches that incorporated the above comments
> > > > > too. Please review them.
> > > > >
> > > >
> > > > I have made the following minor changes to the 0001 patch: (a) An
> > > > assert was removed from dead_items_max_items() which I added back. (b)
> > > > Removed an unnecessary semicolon from one of the statements in
> > > > compute_parallel_vacuum_workers(). (c) Changed comments at a few
> > > > places. (d) moved all parallel_vacuum_* related functions together.
> > > > (e) ran pgindent and slightly modify the commit message.
> > > >
> > > > Let me know what you think of the attached?
> > >
> > > Thank you for updating the patch!
> > >
> > > The patch also moves some functions, e.g., update_index_statistics()
> > > is moved without code changes. I agree to move functions for
> > > consistency but that makes the review hard and the patch complicated.
> > > I think it's better to do improving the parallel vacuum code and
> > > moving functions in separate patches.
> > >
> >
> > Okay, I thought it might be better to keep all parallel_vacuum_*
> > related functions together but we can keep that in a separate patch
> > Feel free to submit without those changes.
>
> I've attached the patch. I've just moved some functions back but not
> done other changes.
>

Thanks for your patch.

I tested your patch and tried some cases, like large indexes, different types of indexes, it worked well.

Besides, I noticed a typo as follows:

+ /* Estimate size for index vacuum stats -- PARALLEL_VACUUM_KEY_STATS */

"PARALLEL_VACUUM_KEY_STATS" should be "PARALLEL_VACUUM_KEY_INDEX_STATS".

Regards,
Tang