Re: logical replication problem

On 28/1/19 12:12 μ.μ., Thomas Schweikle wrote:
> Hi!
>
> Setup:
>
> - db-server_A on port 5432
> - db-server_B on port 5433
>
> on db-server_A:
> postgres=# \dRp
> Liste der Publikationen
> Name | Eigentümer | Alle Tabellen | Inserts | Updates | Deletes
> ------+------------+---------------+---------+---------+---------
> mig1 | postgres | t | t | t | t
>
> on db-server_B:
> postgres=# \dRs
> Liste der Subskriptionen
> Name | Eigentümer | Eingeschaltet | Publikation
> ------+------------+---------------+-------------
> sub1 | postgres | t | {mig1}
>
> in db-server_A pg_hba.conf:
> local replication postgres peer
> host replication postgres 127.0.0.1/32 ident
> host replication postgres ::1/128 ident
>
> on db-server_A:
> postgres# CREATE PUBLICATION mig1 FOR ALL TABLES;
> CREATE PUBLICATION
>
> the command on db-server_B:
> postgres# CREATE SUBSCRIPTION sub1 CONNECTION 'host=127.0.0.1
> port=5432 dbname=mydb user=postgres PUBLICATION mig1;
> NOTICE: created replication slot "sub1" on publisher
> CREATE SUBSCRIPTION
>
> worked as expected.
> But: instead of starting replication I find Errors within db-server_B logs:
> 2019-01-24 10:57:58.549 CET [28956] LOG: Apply-Worker für logische
> Replikation für Subskription »sub1« hat gestartet
> 2019-01-24 10:57:58.553 CET [28956] FEHLER: konnte keine Daten vom
> WAL-Stream empfangen: FEHLER: Publikation »mig1« existiert nicht
> KONTEXT: Slot »sub1«, Ausgabe-Plugin »pgoutput«, im Callback
> change, zugehörige LSN 47/B4BCA2A8
> 2019-01-24 10:57:58.554 CET [5982] LOG: Background-Worker »logical
> replication worker« (PID 28956) beendete mit Status 1
It could help if your logs were in English, anyways any error prior to that? Closely monitoring the subscription node is very important. Any error could stall / pause logical replication.
>
> Configuration was set on both servers to include
> wal_level = logical
>
> Any ideas why this does not work as expected? Any further ideas what
> to prove on db-server_A and db-server_B?
>
>

--
Achilleas Mantzios
IT DEV Lead
IT DEPT
Dynacom Tankers Mgmt