Updating Postgres Source Connector DB Endpoint
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Mukesh Kumar
Jun 6, 2025, 6:37:29 AM (13 days ago) Jun 6
to debezium
Hi,
Scenario:
I’m using AWS RDS PostgreSQL as the source database and have set up a Debezium PostgreSQL source connector that captures changes via a replication slot and publishes them to Kafka.
Now, we are planning to create a new AWS RDS instance by restoring a snapshot of the existing DB and decommissioning the current RDS instance.
Question:
In this case, can I simply update the existing Debezium connector configuration to point to the new RDS endpoint, keeping the same replication slot name and plugin settings?
Or is it necessary to create a new connector entirely and let it reinitialize from the new database?
Also, are there any caveats around the replication slot state or LSN position continuity that I should be aware of
Regards
Mukesh
Chris Cranford
Jun 9, 2025, 4:54:33 PM (10 days ago) Jun 9
to debe...@googlegroups.com
Hi Mukesh -
This effectively falls under the same scenario of reconfiguring Debezium to point to a secondary replica of PostgreSQL that you've promoted to be the primary system during a fail-over scenario. In short, the replication slot won't exist in the restored database because RDS does not include them when you create a snapshot or a backup of the database, so on restoration you have to be careful that you don't introduce any changes to the restored system that would otherwise introduce potential data loss when you manually re-create the replication slot after restoring from the backup.
In practice, unless you can be certain that doesn't happen, it's generally best to start from scratch to avoid any potential human errors during the restoration and recreation of the replication slot.
Hope that helps.
-cc
This effectively falls under the same scenario of reconfiguring Debezium to point to a secondary replica of PostgreSQL that you've promoted to be the primary system during a fail-over scenario. In short, the replication slot won't exist in the restored database because RDS does not include them when you create a snapshot or a backup of the database, so on restoration you have to be careful that you don't introduce any changes to the restored system that would otherwise introduce potential data loss when you manually re-create the replication slot after restoring from the backup.
In practice, unless you can be certain that doesn't happen, it's generally best to start from scratch to avoid any potential human errors during the restoration and recreation of the replication slot.
Hope that helps.
-cc
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