Re: Query regarding support of test_decoding and PGReplicationStream with Standby Logical Replication

Hi Dinesh,

Yes, that is correct.

Regards,
Kiran

On Tue, Jul 15, 2025 at 11:43 PM DINESH NAIR <Dinesh_Nair@iitmpravartak.net>
wrote:

>
> Hi Kiran,
>
> Are we trying to perform logical replication from create replication slots
> on a standby server and use logical decoding plugins(JDBC
> PGReplicationStream API) to stream changes from the standby
> Is  my understanding correct?
>
>
>
>
> Hi,
>
> I have a question regarding the new feature introduced in PostgreSQL 16
> that enables logical replication from a standby server.
>
> Currently, we are using a standalone instance of PostgreSQL 16 and
> performing logical replication by creating replication slots and utilizing
> the JDBC replication stream API (PGReplicationStream)  with the
> test_decoding plugin.
>
> Could you please confirm whether this approach of logical replication is
> supported from a standby system? Specifically, does the standby system
> support the test_decoding plugin and the JDBC PGReplicationStream API for
> streaming changes ?
>
> Reference to JDBC Logical replication -
> https://jdbc.postgresql.org/documentation/server-prepare/#example-96-create-logical-replication-stream
>
> Regards,
> Kiran
>
>
>
>
> Thanks
>
> Dinesh
>
>
> ------------------------------
> *From:* Kiran K V <kirankv.1982@gmail.com>
> *Sent:* Friday, July 11, 2025 11:09 PM
> *To:* pgsql-general@postgresql.org <pgsql-general@postgresql.org>
> *Subject:* Query regarding support of test_decoding and
> PGReplicationStream with Standby Logical Replication
>
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> Hi,
>
> I have a question regarding the new feature introduced in PostgreSQL 16
> that enables logical replication from a standby server.
>
> Currently, we are using a standalone instance of PostgreSQL 16 and
> performing logical replication by creating replication slots and utilizing
> the JDBC replication stream API (PGReplicationStream)  with the
> test_decoding plugin.
>
> Could you please confirm whether this approach of logical replication is
> supported from a standby system? Specifically, does the standby system
> support the test_decoding plugin and the JDBC PGReplicationStream API for
> streaming changes ?
>
> Reference to JDBC Logical replication -
> https://jdbc.postgresql.org/documentation/server-prepare/#example-96-create-logical-replication-stream
>
> Regards,
> Kiran
>
>