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Alexander KukushkinandGitHub
ad5c686c11
So far Patroni was parsing `recovery.conf` or querying `pg_settings` in order to get the current values of recovery parameters. On PostgreSQL earlier than 12 it could easily happen that the value of `primary_conninfo` in the `recovery.conf` has nothing to do with reality. Luckily for us, on PostgreSQL 9.6+ there is a `pg_stat_wal_receiver` view, which contains current values of `primary_conninfo` and `primary_slot_name`. The password field is masked through, but this is fine, because authentication happens only during opening the connection. All other parameters we compare as usual. Another advantage of `pg_stat_wal_recevier` - it contains the current timeline, therefore on 9.6+ we don't need to use the replication connection trick if walreceiver process is alive. If there is no walreceiver process available or it is not streaming we will stick to old methods.