| From: | Peter Geoghegan <pg(at)bowt(dot)ie> |
|---|---|
| To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
| Cc: | PostgreSQL Hackers <pgsql-hackers(at)lists(dot)postgresql(dot)org>, Andrey Borodin <x4mmm(at)yandex-team(dot)ru> |
| Subject: | Re: Should the nbtree page split REDO routine's locking work more like the locking on the primary? |
| Date: | 2020-08-07 22:28:46 |
| Message-ID: | CAH2-Wz=ukRBOFjTkmHJGBr9zzHaSwfYP4_JN6R3mq2=SFv5MYg@mail.gmail.com |
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| Lists: | pgsql-hackers |
On Thu, Aug 6, 2020 at 7:00 PM Peter Geoghegan <pg(at)bowt(dot)ie> wrote:
> On Thu, Aug 6, 2020 at 6:08 PM Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:
> > +1 for making this more like what happens in original execution ("on the
> > primary", to use your wording). Perhaps what you suggest here is still
> > not enough like the original execution, but it sounds closer.
>
> It won't be the same as the original execution, exactly -- I am only
> thinking of holding on to same-level page locks (the original page,
> its new right sibling, and the original right sibling).
I pushed a commit that reorders the lock acquisitions within
btree_xlog_unlink_page() -- they're now consistent with _bt_split()
(at least among sibling pages involved in the page split).
Thanks
--
Peter Geoghegan
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