Re: PostgreSQL 16 release announcement draft

On 8/24/23 11:17 AM, Erik Rijkers wrote:
> Op 8/24/23 om 16:32 schreef Jonathan S. Katz:
>> On 8/23/23 5:07 PM, David Rowley wrote:
>>> On Thu, 24 Aug 2023 at 05:55, Jonathan S. Katz <jkatz(at)postgresql(dot)org>
>>> wrote:
>
> Hi,
>
> When v15 docs have:
>
> "27.2.7. Cascading Replication
> The cascading replication feature allows a standby server to accept
> replication connections and stream WAL records to other standbys, acting
> as a relay. This can be used to reduce the number of direct connections
> to the primary and also to minimize inter-site bandwidth overheads."
>
> why then, in the release draft, is that capability mentioned as
> something that is new for v16?
> "
> In PostgreSQL 16, users can perform logical decoding from a standby
> instance, meaning a standby can publish logical changes to other servers.
> "
>
> Is there a difference between the two?

Yes. Those docs refer to **physical** replication, where a standby can
continue to replicate WAL records to other standbys. In v16, standbys
can now publish changes over **logical** replication.

Thanks,

Jonathan