| From: | Greg Nancarrow <gregn4422(at)gmail(dot)com> |
|---|---|
| To: | Tomas Vondra <tomas(dot)vondra(at)enterprisedb(dot)com> |
| Cc: | Dilip Kumar <dilipbalaut(at)gmail(dot)com>, Amit Kapila <amit(dot)kapila16(at)gmail(dot)com>, Alvaro Herrera <alvherre(at)alvh(dot)no-ip(dot)org>, Euler Taveira <euler(at)eulerto(dot)com>, Peter Smith <smithpb2250(at)gmail(dot)com>, Rahila Syed <rahilasyed90(at)gmail(dot)com>, Peter Eisentraut <peter(dot)eisentraut(at)enterprisedb(dot)com>, Önder Kalacı <onderkalaci(at)gmail(dot)com>, japin <japinli(at)hotmail(dot)com>, Michael Paquier <michael(at)paquier(dot)xyz>, David Steele <david(at)pgmasters(dot)net>, Craig Ringer <craig(at)2ndquadrant(dot)com>, Tomas Vondra <tomas(dot)vondra(at)2ndquadrant(dot)com>, Amit Langote <amitlangote09(at)gmail(dot)com>, PostgreSQL Hackers <pgsql-hackers(at)lists(dot)postgresql(dot)org> |
| Subject: | Re: row filtering for logical replication |
| Date: | 2021-07-20 00:12:02 |
| Message-ID: | CAJcOf-dVG+eHKiyVqwHhTPap_OAvb+24OZuQ5VF1QeKqcfACvA@mail.gmail.com |
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| Lists: | pgsql-hackers |
On Mon, Jul 19, 2021 at 11:32 PM Tomas Vondra
<tomas(dot)vondra(at)enterprisedb(dot)com> wrote:
>
> I have a feeling it's getting overly complicated, to the extent that
> it'll be hard to explain to users and reason about. I don't think
> there's a "perfect" solution for cases when the filter expression gives
> different answers for old/new row - it'll always be surprising for some
> users :-(
>
> So maybe the best thing is to stick to the simple approach already used
> e.g. by pglogical, which simply user the new row when available (insert,
> update) and old one for deletes.
>
> I think that behaves more or less sensibly and it's easy to explain.
>
> All the other things (e.g. turning UPDATE to INSERT, advanced conflict
> resolution etc.) will require a lot of other stuff, and I see them as
> improvements of this simple approach.
>
+1
My thoughts on this are very similar.
Regards,
Greg Nancarrow
Fujitsu Australia
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