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When libpq is loaded in the server (for instance, by libpqwalreceiver), it may use libpq environment variables set in the postmaster environment for connection parameter defaults. This has some confusing effects in our test suites. For example, the TAP test infrastructure sets PGAPPNAME to allow identifying clients in the server log. But this environment variable is also inherited by temporary servers started with pg_ctl and is then in turn used by libpqwalreceiver as the application_name for connecting to remote servers where it then shows up in pg_stat_replication and is relevant for things like synchronous_standby_names. Replication already has a suitable default for application_name, and overriding that accidentally then requires the individual test cases to re-override that, which is all very confusing and unnecessary. To fix, unset PGAPPNAME temporarily before running pg_ctl start or restart in the tests. More comprehensive approaches like unsetting all environment variables in pg_ctl were considered but might be too complicated to achieve portably. The now unnecessary re-overriding of application_name by test cases is also removed. Reviewed-by: Noah Misch <noah@leadboat.com> Discussion: https://www.postgresql.org/message-id/flat/33383613-690e-6f1b-d5ba-4957ff40f6ce@2ndquadrant.com
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/.