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This script supposed that if it turned hot_standby_feedback on and then shut down the standby server, at least one feedback message would be guaranteed to be sent before the standby stops. But there is no such guarantee, if the standby's walreceiver process is slow enough --- and we've seen multiple failures in the buildfarm showing that that does happen in practice. While we could rearrange the walreceiver logic to make it less likely, it seems probably impossible to create a really bulletproof guarantee of that sort; and if we tried, we might create situations where the walreceiver wouldn't react in a timely manner to shutdown commands. It seems better instead to remove the script's assumption that feedback will occur before shutdown. But once we do that, these last few tests seem quite redundant with the earlier tests in the script. So let's just drop them altogether and save some buildfarm cycles. Backpatch to v10 where these tests were added. Discussion: https://postgr.es/m/1922.1531592205@sss.pgh.pa.us
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/.