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This commit reverts 8f67f994e8ea (down to v13) and c3de0f9eed38 (down to v17), as these are proving to not be completely correct regarding two aspects: - In v17 and newer branches, c3de0f9eed38's check for epoch handling is incorrect, and does not correctly handle frozen epochs. A logic closer to widen_snapshot_xid() should be used. The 2PC code should try to integrate deeper with FullTransactionIds, 5a1dfde8334b being not enough. - In v13 and newer branches, 8f67f994e8ea is a workaround for the real issue, which is that we should not attempt CLOG lookups without reaching consistency. This exists since 728bd991c3c4, and this is reachable with ProcessTwoPhaseBuffer() called by restoreTwoPhaseData() at the beginning of recovery. Per discussion with Noah Misch. Discussion: https://postgr.es/m/20250116010051.f3.nmisch@google.com Backpatch-through: 13
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/.