Re: pg_upgrade and logical replication

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От Justin Pryzby
Тема Re: pg_upgrade and logical replication
Дата
Msg-id ZcvZipRoi_kopIpb@pryzbyj2023
обсуждение исходный текст
Ответ на Re: pg_upgrade and logical replication  (Amit Kapila <amit.kapila16@gmail.com>)
Ответы Re: pg_upgrade and logical replication  (Michael Paquier <michael@paquier.xyz>)
RE: pg_upgrade and logical replication  ("Hayato Kuroda (Fujitsu)" <kuroda.hayato@fujitsu.com>)
Список pgsql-hackers
On Tue, Jan 02, 2024 at 03:58:25PM +0530, Amit Kapila wrote:
> Pushed.

pg_upgrade/t/004_subscription.pl says

|my $mode = $ENV{PG_TEST_PG_UPGRADE_MODE} || '--copy';

..but I think maybe it should not.

When you try to use --link, it fails:
https://cirrus-ci.com/task/4669494061170688

|Adding ".old" suffix to old global/pg_control                 ok
|
|If you want to start the old cluster, you will need to remove
|the ".old" suffix from
/tmp/cirrus-ci-build/build/testrun/pg_upgrade/004_subscription/data/t_004_subscription_old_sub_data/pgdata/global/pg_control.old.
|Because "link" mode was used, the old cluster cannot be safely
|started once the new cluster has been started.
|...
|
|postgres: could not find the database system
|Expected to find it in the directory
"/tmp/cirrus-ci-build/build/testrun/pg_upgrade/004_subscription/data/t_004_subscription_old_sub_data/pgdata",
|but could not open file
"/tmp/cirrus-ci-build/build/testrun/pg_upgrade/004_subscription/data/t_004_subscription_old_sub_data/pgdata/global/pg_control":
Nosuch file or directory
 
|# No postmaster PID for node "old_sub"
|[19:36:01.396](0.250s) Bail out!  pg_ctl start failed

You could rename pg_control.old to avoid that immediate error, but that doesn't
address the essential issue that "the old cluster cannot be safely started once
the new cluster has been started."

-- 
Justin



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