Vijaykumar Jain wrote: > We are glad that we have this feature that allows us to load balance reads. > that has helped us a lot. > https://paquier.xyz/postgresql-2/postgres-10-multi-host-connstr/ > > I would like to know if it is possible to request a similar enhancement to FDWs too? > https://www.postgresql.org/docs/11/sql-createserver.html > > unless i am missing something obvious, we wanted to use this option when one > of the read instances are down when there is a FDW query for reads. > the second instance is only a fallback, not round robin. and we have > 2 foreign servers, one for write and one for reads.
The documentation of postgres_fdw says:
A foreign server using the postgres_fdw foreign data wrapper can have the same options that libpq accepts in connection strings, as described in Section 34.1.2, except that these options are not allowed:
user and password (specify these in a user mapping, instead)
client_encoding (this is automatically set from the local server encoding)
fallback_application_name (always set to postgres_fdw)
So there is nothing that keeps you from using multiple host names or ports, and you can also use "target_session_attrs".
