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The failure is that the remote slot is not synchronized after the same slot on standby gets invalidated. The reason was that remote_slot's restart_lsn was lagged behind the standby's oldest WAL segment. The test didn't ensure that remote_slot's LSN was advanced to the latest position before we tried to sync the slots via new the function pg_sync_replication_slots(). Discussion: https://postgr.es/m/CAA4eK1JLBi3HzenB6do3_hd78kN0UDD1mz-vumWE52XHHEq5Bw@mail.gmail.com
PostgreSQL Database Management System ===================================== This directory contains the source code distribution of the PostgreSQL database management system. PostgreSQL is an advanced object-relational database management system that supports an extended subset of the SQL standard, including transactions, foreign keys, subqueries, triggers, user-defined types and functions. This distribution also contains C language bindings. Copyright and license information can be found in the file COPYRIGHT. General documentation about this version of PostgreSQL can be found at: https://www.postgresql.org/docs/devel/ In particular, information about building PostgreSQL from the source code can be found at: https://www.postgresql.org/docs/devel/installation.html The latest version of this software, and related software, may be obtained at https://www.postgresql.org/download/. For more information look at our web site located at https://www.postgresql.org/.