On Mon, Nov 14, 2016 at 8:09 PM, Tsunakawa, Takayuki <tsunakawa.ta...@jp.fujitsu.com> wrote: > From: pgsql-hackers-ow...@postgresql.org >> [mailto:pgsql-hackers-ow...@postgresql.org] On Behalf Of Mithun Cy >> Thanks, my concern is suppose you have 3 server in cluster A(new version), >> B(new version), C(old version). If we implement as above only new servers >> will send ParameterStatus message to indicate what type of server we are >> connected. Server C will not send same. So we will not be able to use new >> feature "failover to new master" for such a kind of cluster. > > No, the streaming replication requires the same major release for all member > servers, so there's no concern about the mixed-version cluster.
True, but there is a concern about a newer libpq connecting to older servers. If we mimic what JDBC is already doing, we'll be compatible and you'll be able to use this feature with a v10 libpq without worrying about whether the target server is also v10. If we invent something new on the server side, then you'll need to be sure you have both a v10 libpq and v10 server. -- Robert Haas EnterpriseDB: http://www.enterprisedb.com The Enterprise PostgreSQL Company -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
