Re: speed up a logical replica setup

Hi,

> My top-up patches fixes some issues.
>
> v15-0001: same as v14-0001
> === experimental patches ===
> v15-0002: Use replication connections when we connects to the primary.
> Connections to standby is not changed because the standby/subscriber
> does not require such type of connection, in principle.
> If we can accept connecting to subscriber with replication mode,
> this can be simplified.
> v15-0003: Remove -P and use primary_conninfo instead. Same as v13-0004
> v15-0004: Check whether the target is really standby. This is done by pg_is_in_recovery()
> v15-0005: Avoid stopping/starting standby server in dry_run mode.
> I.e., approach a). in #10 is used.
> v15-0006: Overwrite recovery parameters. I.e., aproach b). in #9 is used.
>
> [1]: https://www.postgresql.org/message-id/b315c7da-7ab1-4014-a2a9-8ab6ae26017c%40app.fastmail.com
>

I have created a topup patch 0007 on top of v15-0006.

I revived the patch which removes -S option and adds some options
instead. The patch add option for --port, --username and --socketdir.
This patch also ensures that anyone cannot connect to the standby
during the pg_createsubscriber, by setting listen_addresses,
unix_socket_permissions, and unix_socket_directories.

Thanks and Regards,
Shlok Kyal