Horton

Re: protocol version negotiation (Re: Libpq PGRES_COPY_BOTH - version compatibility)

Craig Ringer <craig@2ndquadrant.com>

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From: Craig Ringer <craig@2ndquadrant.com>
To: Tom Lane <tgl@sss.pgh.pa.us>
Cc: Robert Haas <robertmhaas@gmail.com>, Peter Eisentraut <peter_e@gmx.net>, Magnus Hagander <magnus@hagander.net>, PostgreSQL-development <pgsql-hackers@postgresql.org>
Date: 2017-06-29T04:24:44Z
Lists: pgsql-hackers 
On 29 June 2017 at 12:23, Craig Ringer <craig@2ndquadrant.com> wrote:

> It does. But I don't see anywhere that extra round trips have been discussed.

Ah, right, they're implied by having the server respond with some
downversion message and ignore input until the client sends a new
startup message. That'll only happen when a too-new client connects to
an older server, but that's probably not an especially unusual case.

-- 
 Craig Ringer                   http://www.2ndQuadrant.com/
 PostgreSQL Development, 24x7 Support, Training & Services

Commits

  1. Provide for forward compatibility with future minor protocol versions.

  2. Give nicer error message when connecting to a v10 server requiring SCRAM.