On 2020/12/22 18:07, Li Japin wrote:
> Hi, all
>
> In Stream Replication Protocol [1], the documentation of `START_REPLICATION` message is
>
> XLogData (B)
> …
> Primary keepalive message (B)
> …
> Standby status update (F)
> …
> Hot Standby feedback message (F)
> ...
>
> I’m confused about the means of ‘B’ and ‘F’? If it doesn't make sense, why we document here?
> However, if it makes sense, should we explain it?
> Can someone help me out?
‘B’ means a backend and ‘F’ means a frontend. Maybe as [1] does, we should
add the note like "Each is marked to indicate that it can be sent by
a frontend (F) and a backend (B)" into the description about each message
format for START_REPLICATION.
[1]
https://www.postgresql.org/docs/devel/protocol-message-formats.html
Regards,
--
Fujii Masao
Advanced Computing Technology Center
Research and Development Headquarters
NTT DATA CORPORATION