| From: | Junwang Zhao <zhjwpku(at)gmail(dot)com> |
|---|---|
| To: | Euler Taveira <euler(at)eulerto(dot)com> |
| Cc: | "kuroda(dot)hayato(at)fujitsu(dot)com" <kuroda(dot)hayato(at)fujitsu(dot)com>, "pgsql-hackers(at)lists(dot)postgresql(dot)org" <pgsql-hackers(at)lists(dot)postgresql(dot)org>, Shlok Kyal <shlok(dot)kyal(dot)oss(at)gmail(dot)com>, vignesh C <vignesh21(at)gmail(dot)com>, Michael Paquier <michael(at)paquier(dot)xyz>, Peter Eisentraut <peter(at)eisentraut(dot)org>, Andres Freund <andres(at)anarazel(dot)de>, Ashutosh Bapat <ashutosh(dot)bapat(dot)oss(at)gmail(dot)com>, Amit Kapila <amit(dot)kapila16(at)gmail(dot)com> |
| Subject: | Re: speed up a logical replica setup |
| Date: | 2024-01-14 01:42:46 |
| Message-ID: | CAEG8a3+wL_2R8n12BmRz7yBP3EBNdHDhmdgxQFA9vS+zPR+3Kw@mail.gmail.com |
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| Lists: | pgsql-hackers |
Hi Euler,
On Fri, Jan 12, 2024 at 6:16 AM Euler Taveira <euler(at)eulerto(dot)com> wrote:
>
> On Thu, Jan 11, 2024, at 9:18 AM, Hayato Kuroda (Fujitsu) wrote:
>
> I have been concerned that the patch has not been tested by cfbot due to the
> application error. Also, some comments were raised. Therefore, I created a patch
> to move forward.
>
>
> Let me send an updated patch to hopefully keep the CF bot happy. The following
> items are included in this patch:
>
> * drop physical replication slot if standby is using one [1].
> * cleanup small changes (copyright, .gitignore) [2][3]
> * fix getopt_long() options [2]
> * fix format specifier for some messages
> * move doc to Server Application section [4]
> * fix assert failure
> * ignore duplicate database names [2]
> * store subscriber server log into a separate file
> * remove MSVC support
>
> I'm still addressing other reviews and I'll post another version that includes
> it soon.
>
> [1] https://www.postgresql.org/message-id/e02a2c17-22e5-4ba6-b788-de696ab74f1e%40app.fastmail.com
> [2] https://www.postgresql.org/message-id/CALDaNm1joke42n68LdegN5wCpaeoOMex2EHcdZrVZnGD3UhfNQ%40mail.gmail.com
> [3] https://www.postgresql.org/message-id/TY3PR01MB98895BA6C1D72CB8582CACC4F5682%40TY3PR01MB9889.jpnprd01.prod.outlook.com
> [4] https://www.postgresql.org/message-id/TY3PR01MB988978C7362A101927070D29F56A2%40TY3PR01MB9889.jpnprd01.prod.outlook.com
>
+ <refnamediv>
+ <refname>pg_subscriber</refname>
+ <refpurpose>create a new logical replica from a standby server</refpurpose>
+ </refnamediv>
I'm a bit confused about this wording because we are converting a standby
to a logical replica but not creating a new logical replica and leaving the
standby as is. How about:
<refpurpose>convert a standby replica to a logical replica</refpurpose>
+ <para>
+ The <application>pg_subscriber</application> should be run at the target
+ server. The source server (known as publisher server) should accept logical
+ replication connections from the target server (known as subscriber server).
+ The target server should accept local logical replication connection.
+ </para>
What is *local logical replication*? I can't find any clue in the patch, can you
give me some hint?
>
> --
> Euler Taveira
> EDB https://www.enterprisedb.com/
>
--
Regards
Junwang Zhao
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