Hello Fivetran Team,

I would like to request support for enabling WAL-based logical replication from an Aurora PostgreSQL read replica.

Current Limitation

At the moment, Fivetran requires connecting to the writer (primary) instance to use WAL-based logical replication for Aurora PostgreSQL. This creates operational challenges because:

• Running WAL-based CDC on the primary adds load to the writer node.

• Many organizations (including ours) prefer to isolate analytical workloads on reader instances.

• Query-based/XMIN-based replication on a replica is significantly more resource-intensive and less reliable for high-volume databases.

Feature Request

Please add support for reading replicated WAL from an Aurora reader instance, allowing logical replication to occur without impacting the writer node.

Important context: Aurora already supports logical replication of WAL on both primary and replicated nodes (https://docs.aws.amazon.com/AmazonRDS/latest/AuroraUserGuide/AuroraPostgreSQL.Replication.Logical.Configure.html). Reader instances maintain the WAL stream internally, but Fivetran currently does not allow sourcing logical replication from a replica.

Why This Matters

• Reduces load on the primary Aurora writer node.

• Improves reliability and scalability of CDC pipelines.

• Enables organizations with large workloads to run efficient incremental syncs without risking production performance.

• Aligns with the architecture of high-availability Aurora clusters, where replicas are meant to offload non-critical workloads.

Implementing this feature would enable us and many other Aurora users to adopt a more stable, scalable architecture for CDC.

Thank you for considering this enhancement. 

Best regards,

Konstantin.