Thread: Bugreport | Logical replication PostgreSQL 12 | Error after disable / enable replication

Hello PostgreSQL Team,

I encountered a problem with logical replication in PostgreSQL 12.

After disable/enable of a subscription I get error messages

   ERROR:  could not start WAL streaming: FEHLER:  Replikations-Slot »mysub« ist aktiv für PID 21192

Steps to reproduce

==================

Used PostgreSQL Versions

------------------------

  Publisher:

    Windows 7 / postgresql-12.4-1-windows-x64

  Subscriber

    Debian 9.13 / 12.4-1.pgdg90+1

Step to reproduce

-----------------

  Publisher:

    CREATE PUBLICATION mypub FOR TABLE

      data.table-1

      data.table-2

      data.table-3

      data.table-4

      data.table-5

      data.table-6

      data.table-7

      data.table-8;

  Subscriber

      CREATE SUBSCRIPTION mysub

       CONNECTION 'dbname=... host=... port=5433 user=postgres password=...'

       PUBLICATION mypub

       WITH (copy_data = false);

    ;

    ALTER SUBSCRIPTION "mysub" disable;

    wait several minutes

    ALTER SUBSCRIPTION "mysub" enable;

    Logs

       2020-09-30 19:51:14.407 CEST [15578]  00000 LOG:  logical replication apply worker for subscription "mysub" has started

       2020-09-30 20:00:54.914 CEST [15578]  00000 LOG:  logical replication apply worker for subscription "mysub" will stop because the subscription was disabled

       2020-09-30 20:11:34.265 CEST [20198]  00000 LOG:  logical replication apply worker for subscription "mysub" has started

       2020-09-30 20:11:34.301 CEST [20198]  XX000 ERROR:  could not start WAL streaming: FEHLER:  Replikations-Slot »mysub« ist aktiv für PID 21192

       2020-09-30 20:11:34.302 CEST [15428]  00000 LOG:  background worker "logical replication worker" (PID 20198) exited with exit code 1

       2020-09-30 20:11:39.309 CEST [20212]  00000 LOG:  logical replication apply worker for subscription "mysub" has started

       2020-09-30 20:11:39.352 CEST [20212]  XX000 ERROR:  could not start WAL streaming: FEHLER:  Replikations-Slot »mysub« ist aktiv für PID 21192

       2020-09-30 20:11:39.354 CEST [15428]  00000 LOG:  background worker "logical replication worker" (PID 20212) exited with exit code 1

       2020-09-30 20:11:44.357 CEST [20222]  00000 LOG:  logical replication apply worker for subscription "mysub" has started

       2020-09-30 20:11:44.396 CEST [20222]  XX000 ERROR:  could not start WAL streaming: FEHLER:  Replikations-Slot »mysub« ist aktiv für PID 21192

       2020-09-30 20:11:44.398 CEST [15428]  00000 LOG:  background worker "logical replication worker" (PID 20222) exited with exit code 1

       2020-09-30 20:11:49.402 CEST [20225]  00000 LOG:  logical replication apply worker for subscription "mysub" has started

       2020-09-30 20:11:49.452 CEST [20225]  XX000 ERROR:  could not start WAL streaming: FEHLER:  Replikations-Slot »mysub« ist aktiv für PID 21192

       2020-09-30 20:11:49.453 CEST [15428]  00000 LOG:  background worker "logical replication worker" (PID 20225) exited with exit code 1

I set up this configuration a few months ago with an earlier version and it worked.

Best regards,

Michael