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
