Re: replication slot "pg_1015733_sync_1014718_7358407382484881476" does not exist

Hi Avi,

Based on the slot name this is an initial sync worker being created by the
Logical Replication supervisor. Subscriber started an initial sync either
failed to create the slot and now thinks it exists and keeps trying to drop
it on the publisher or another process dropped the slot on the publisher
before the sync was completed .

To fix this first identify the table involved so you know which table is
causing the issue. The name of the table can be figured from the slot
name pg_1015733_sync_1014718_7358407382484881476; the number 1014718 is
the oid of the table on the subscriber.

I suspect the table 1014718 is empty and not being replicated

Step to clean this up
1: remove the table from the publication
2: refresh the subscription on the subscriber

This typically fixes it.

If the table is empty then can simply add the table back to the publication
and refresh the subscription. If not need to truncate the table watch out
for foreign key constraints on the table. If foreign key constraints can
drop them then truncate the table or using the replication role session
variable to truncate the table or use some other means to catch the table
backup and refresh the subscription with the copy_data = FALSE set.

If that does not work will need to be manually cleaned up to avoid a full
resync of all the tables.
Dropping the replication origin see the
function pg_replication_origin_drop(). If the table is not removed the
subscription PG will recreate the origin. The only way to remove a table
from a subscription SAFELY is refresh the subscription after the table been
removed from the publication

https://www.postgresql.org/docs/current/catalog-pg-replication-origin.html
https://www.postgresql.org/docs/15/functions-admin.html#FUNCTIONS-REPLICATION

On Wed, Apr 17, 2024 at 11:17 AM Avi Weinberg <AviW(at)gilat(dot)com> wrote:

> Fixed a typo…
>
>
>
> Hi Experts,
>
>
>
> For a second time in the past few months I'm getting the following errors
> in Postgres log. Last time it was solved when I reset all Postgres pods.
> Now reset no longer helps. Logical replication is not working even after I
> performed the reset.
>
> Any ideas what is wrong?
>
>
>
> *From:* Avi Weinberg <AviW(at)gilat(dot)com>
> *Sent:* Wednesday, April 17, 2024 6:01 PM
> *To:* pgsql-generallists.postgresql.org <
> pgsql-general(at)lists(dot)postgresql(dot)org>
> *Subject:* [External] replication slot
> "pg_1015733_sync_1014718_7358407382484881476" does not exist
>
>
>
> Hi Experts,
>
>
>
> For a second time in the past few months I'm getting the following errors
> in Postgres log. Last time it was solved when I reset all Postgres pods.
> Now reset no longer helps. Logical replication is now working even after I
> performed the reset.
>
> Any ideas what is wrong?
>
>
>
>
>
> ERROR: replication slot "pg_1015733_sync_1014718_7358407382484881476"
> does not exist
>
> STATEMENT: DROP_REPLICATION_SLOT
> pg_1015733_sync_1014718_7358407382484881476 WAIT
>
> ERROR: replication slot "pg_1015733_sync_1014956_7358407382484881476"
> does not exist
>
> STATEMENT: DROP_REPLICATION_SLOT
> pg_1015733_sync_1014956_7358407382484881476 WAIT
>
> 192 ERROR: replication slot "pg_927671_sync_927281_7358103111795036228"
> does not exist
>
> START_REPLICATION SLOT "pg_927671_sync_927281_7358103111795036228" LOGICAL
> 0/AC888F00 (proto_version '3', publication_names '"aaa","bbb"')
>
> replication slot "pg_1015733_sync_1015375_7358407382484881476" does not
> exist
>
> DROP_REPLICATION_SLOT pg_1015733_sync_1015375_7358407382484881476 WAIT
>
>
>
>
>
> Thanks
>
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