Re:Re:Re: Propose: Adding a '--enable-failover' option to 'pg_createsubscriber' ver.3 - Mailing list pgsql-hackers

From Xueyu Gao
Subject Re:Re:Re: Propose: Adding a '--enable-failover' option to 'pg_createsubscriber' ver.3
Date
Msg-id 2389aaf9.6e38.19b0c652292.Coremail.gaoxueyu_hope@163.com
Whole thread Raw
In response to Re:Re: Propose: Adding a '--enable-failover' option to 'pg_createsubscriber' ver.3  ("Xueyu Gao" <gaoxueyu_hope@163.com>)
List pgsql-hackers
At 2025-12-11 15:13:40, "Xueyu Gao" <gaoxueyu_hope@163.com> wrote:

At 2025-12-11 14:39:16, "Ioseph Kim" <pgsql-kr@postgresql.kr> wrote:
>Hi
>
>TAP test codes are added in the patch
>and manual has become more user-friendly.
>
>Please review the patch and let me know if you see a better solution. I’ll be glad to update it accordingly.
>
>ioseph
>
>On Wed, Dec 10, 2025 at 06:03:48PM +0900, Ioseph Kim wrote:
>> Hi
>> 
>> A failover option has been added to the CREATE SUBSCRITION command, but this functionality isn't easily accessible using the pg_createsubscriber tool.
>> 
>> Subscriptions created using pg_createsubscriber must be configured for failover via an alter operation.
>> 
>> To address this issue, we've added a simple --enable-failover option to the pg_createsubscriber tool.
>> 
>> This patch is simple. It doesn't handle exceptions or provide any TAP test code.
>> 
>> Please review this and we hope the development team will refine it further.
>> 
>> ioseph

Hi, ioseph,
I took a look at the doc part and have two comments.
/doc/src/sgml/ref/pg_createsubscriber.sgml
1. "The default is <literal>false</literal>" , it'd be better to add "value" after the "default".
2. I think the following content should be surrounded by <para> and </para>, so the <para> should be moved to be in front of "When this option is enabled..."
+ When this option is enabled, the connection string used in the <option>--publisher-server</option>
+ option may be adjusted to support failover. For example, by specifying multiple hosts
+ and using <literal>target_session_attrs=read-write</literal>.
+ <para>
+ </para>
+ </listitem>
+ </varlistentry>
Thanks,
Xueyu Gao

One more comment:
src/bin/pg_basebackup/t/040_pg_createsubscriber.pl
+ 'replication slot are created with the failover option enabled');
This sentence should be "replication slots are ..."
Thanks,
Xueyu Gao

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