The host parameter or hostaddr parameter in the connection string not only specifies the destination of one conmgr process, but can also be a mixture of destinations of other conmgr processes and postmaster. In this case, the connections are tried in the order listed.

For example, if the connection string specifies conmgr1, conmgr2 in that order, and if conmgr1 does not know the server for the attribute specified in target_session_attrs parameter, it queries conmgr2 for the destination. And, for example, if postmaster1, conmgr1 is specified, it will attempt to connect directly to the database instance pointed to by postmaster1. If this fails, query conmgr1 for a connection.