Re: Doc patch for Logical Replication Message Formats (PG14)

On Mon, Jun 21, 2021 at 12:26 PM Brar Piening <brar(at)gmx(dot)de> wrote:
>
> Hello Hackers,
> while amending Npgsql to account for the Logical Streaming Replication
> Protocol changes in PostgreSQL 14 I stumbled upon two documentation
> inaccuracies in the Logical Replication Message Formats documentation
> (https://www.postgresql.org/docs/devel/protocol-logicalrep-message-formats.html)
> that have been introduced (or rather omitted) with the recent changes to
> allow pgoutput to send logical decoding messages
> (https://github.com/postgres/postgres/commit/ac4645c0157fc5fcef0af8ff571512aa284a2cec)
> and to allow logical replication to transfer data in binary format
> (https://github.com/postgres/postgres/commit/9de77b5453130242654ff0b30a551c9c862ed661).
>
>
> 1. The content of the logical decoding message in the 'Message' message
> is prefixed with a length field (Int32) which isn't documented yet.
> See
> https://github.com/postgres/postgres/blob/69a58bfe4ab05567a8fab8bdce7f3095ed06b99c/src/backend/replication/logical/proto.c#L388
> 2. The TupleData may now contain the byte 'b' as indicator for binary
> data which isn't documented yet. See
> https://github.com/postgres/postgres/blob/69a58bfe4ab05567a8fab8bdce7f3095ed06b99c/src/include/replication/logicalproto.h#L83
> and
> https://github.com/postgres/postgres/blob/69a58bfe4ab05567a8fab8bdce7f3095ed06b99c/src/backend/replication/logical/proto.c#L558.
>
> The attached documentation patch fixes both.
>

Yeah, I think these should be fixed and your patch looks good to me in
that regard.

--
With Regards,
Amit Kapila.