| From: | Amit Kapila <amit(dot)kapila16(at)gmail(dot)com> |
|---|---|
| To: | Dilip Kumar <dilipbalaut(at)gmail(dot)com> |
| Cc: | Tomas Vondra <tomas(dot)vondra(at)enterprisedb(dot)com>, Alvaro Herrera <alvherre(at)alvh(dot)no-ip(dot)org>, Greg Nancarrow <gregn4422(at)gmail(dot)com>, 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 10:02:53 |
| Message-ID: | CAA4eK1JCzh=45TZpzGv=OOtz50F9kARQFnAJ2Re7Oodq5+tcng@mail.gmail.com |
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| Lists: | pgsql-hackers |
On Tue, Jul 20, 2021 at 3:19 PM Dilip Kumar <dilipbalaut(at)gmail(dot)com> wrote:
>
> On Tue, Jul 20, 2021 at 3:12 PM Amit Kapila <amit(dot)kapila16(at)gmail(dot)com> wrote:
> >
> > > > Why? I think it would just need similar restrictions as we are
> > > > planning for Delete operation such that filter columns must be either
> > > > present in primary or replica identity columns.
> > > >
> > >
> > > How else would you turn UPDATE to INSERT? For UPDATE we only send the
> > > identity columns and modified columns, and the decision happens on the
> > > subscriber.
> > >
> >
> > Hmm, we log the entire new tuple and replica identity columns for the
> > old tuple in WAL for Update. And, we are going to use a new tuple for
> > Insert, so we have everything we need.
> >
>
> But for making that decision we need to apply the filter on the old
> rows as well right. So if we want to apply the filter on the old rows
> then either the filter should only be on the replica identity key or
> we need to use REPLICA IDENTITY FULL. I think that is what Tomas
> wants to point out.
>
I have already mentioned that for Updates the filter needs criteria
similar to Deletes. This is exactly the requirement for Delete as
well.
--
With Regards,
Amit Kapila.
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