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Commit 9f06d79ef831's replication slot copying failed to properly reserve the WAL that the slot is expecting to see during DecodingContextFindStartpoint (to set the confirmed_flush LSN), so concurrent activity could remove that WAL and cause the copy process to error out. But it doesn't actually *need* that WAL anyway: instead of running decode to find confirmed_flush, it can be copied from the source slot. Fix this by rearranging things to avoid DecodingContextFindStartpoint() (leaving the target slot's confirmed_flush_lsn to invalid), and set that up afterwards by copying from the target slot's value. Also ensure the source slot's confirmed_flush_lsn is valid. Reported-by: Arseny Sher Author: Masahiko Sawada, Arseny Sher Discussion: https://postgr.es/m/871rr3ohbo.fsf@ars-thinkpad
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. PostgreSQL has many language interfaces, many of which are listed here: https://www.postgresql.org/download/ See the file INSTALL for instructions on how to build and install PostgreSQL. That file also lists supported operating systems and hardware platforms and contains information regarding any other software packages that are required to build or run the PostgreSQL system. Copyright and license information can be found in the file COPYRIGHT. A comprehensive documentation set is included in this distribution; it can be read as described in the installation instructions. The latest version of this software may be obtained at https://www.postgresql.org/download/. For more information look at our web site located at https://www.postgresql.org/.