I think, since the idle_session_timeout is by default disabled, we
have no problem. My thought is what if a user enables the
feature(knowingly or unknowingly) on the remote backend? If the user
knows about the above scenario, that may be fine. On the other hand,
either we can always the feature on the remote backend(at the
beginning of the remote txn, like we set for some other configuration
settings see - configure_remote_session() in connection.c) or how
about mentioning the above scenario in this feature documentation?
Though we can disable the idle_session_timeout when using postgres_fdw,
there still has locally cached connection cache entries when the remote sessions
terminated by accident. AFAIK, you have provided a patch to solve this
problem, and it is in current CF [1].
Best Regards,
Japin Li.