Re: speed up a logical replica setup

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От Junwang Zhao
Тема Re: speed up a logical replica setup
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Msg-id CAEG8a3+wL_2R8n12BmRz7yBP3EBNdHDhmdgxQFA9vS+zPR+3Kw@mail.gmail.com
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Ответ на Re: speed up a logical replica setup  ("Euler Taveira" <euler@eulerto.com>)
Список pgsql-hackers
Hi Euler,

On Fri, Jan 12, 2024 at 6:16 AM Euler Taveira <euler@eulerto.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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