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This fixes a problem similar to ad8c86d22cbd. In this case, the test could fail under the following circumstances: - The primary is stopped with teardown_node(), meaning that it may not be able to send all its WAL records to standby_1 and standby_2. - If standby_2 receives more records than standby_1, attempting to reconnect standby_2 to the promoted standby_1 would fail because of a timeline fork. This race condition is fixed with a simple trick: instead of tearing down the primary, it is stopped cleanly so as all the WAL records of the primary are received and flushed by both standby_1 and standby_2. Once we do that, there is no need for a wait_for_catchup() before stopping the node. The test wants to check that a timeline jump can be achieved when reconnecting a standby to a promoted standby in the same cluster, hence an immediate stop of the primary is not required. This failure is harder to reach than the previous instability of 009_twophase, still the buildfarm has been able to detect this failure at least once. I have tried Alexander Lakhin's test trick with the bgwriter and very aggressive standby snapshots, but I could not reproduce it directly. It is reachable, as the buildfarm has proved. Backpatch down to all supported branches, and this problem can lead to spurious failures in the buildfarm. Discussion: https://postgr.es/m/493401a8-063f-436a-8287-a235d9e065fc@gmail.com Backpatch-through: 14
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/.