Thread: Logical Replication to Older Version

We recently upgraded from v9.6 to v13 but are seeing some problems. It's on AWS Aurora, so I won't ask to diagnose a heavily altered version. We're hoping for better results with v12, but when we set up logical replication from v13 to v12, while the initial data snapshot copies the data, pg_stat_replication remains empty.

There are no v13-specific features or idioms in use in the databases. As a sanity check, should it be possible to set up logical replication from a newer version of PostgreSQL to an older version? Has this scenario been tested? Has the logical replication protocol changed between versions?

Thanks in advance,

Miles Elam

Follow up to this. Turns out we had a table without a primary key which halted the ongoing replication.

Reviewing this document in detail now.
https://pgdash.io/blog/postgres-replication-gotchas.html

- Miles Elam