Re: Doc patch for Logical Replication Message Formats (PG14) - Mailing list pgsql-hackers

Amit Kapila wrote:
> On Mon, Jun 21, 2021 at 12:26 PM Brar Piening <brar@gmx.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.
>
After looking at the docs once again I have another minor amendment (new
patch attached).