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From: Li Japin <[email protected]>
To: PostgreSQL Developers <[email protected]>
Subject: Confused about stream replication protocol documentation
Date: Tue, 22 Dec 2020 09:07:21 +0000
Message-ID: <[email protected]> (raw)

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?

Anyway, thanks in advance!

[1] https://www.postgresql.org/docs/devel/protocol-replication.html

--
Best regards
Japin Li

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