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During promotion, there is a window where RecoveryInProgress() returns true but the WAL segments of the old timeline have already been removed. A logical decoding could pick up the old timeline in this window when reading a page, failing with the following error: ERROR: requested WAL segment ... has already been removed This issue does not lead to any data correctness issue, as retrying to decode the data works in follow-up decoding attempts. It impacts availability, though. Other WAL page read callbacks have a similar issue, this commit takes care of what should be the noisiest code path: logical decoding with START_REPLICATION in a WAL sender. A TAP test, based on an injection point waiting in the startup process after the segments have been removed/recycled, is added. This part is backpatched down to v17. This issue has been causing sporadic failures in the buildfarm, and was reproducible manually. This issue happens since logical decoding on standbys exists, down to v16. Reported-by: Alexander Lakhin <exclusion@gmail.com> Author: Bertrand Drouvot <bertranddrouvot.pg@gmail.com> Reviewed-by: Hayato Kuroda <kuroda.hayato@fujitsu.com> Reviewed-by: Xuneng Zhou <xunengzhou@gmail.com> Discussion: https://postgr.es/m/7daef094-abf3-4672-bc23-3df4763b16a3@gmail.com Backpatch-through: 16
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/.