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Previously num_sync could be set to zero and this setting caused an assertion failure. This means that multiple synchronous standbys code should assume that num_sync is greater than zero. Also setting num_sync to zero is nonsense because it's basically the configuration for synchronous replication. If users want not to make transaction commits wait for any standbys, synchronous_standby_names should be emptied to disable synchronous replication instead of setting num_sync to zero. This patch forbids users from setting num_sync to zero in synchronous_standby_names. If zero is specified, an error will happen during processing the parameter settings. Back-patch to 9.6 where multiple synchronous standbys feature was added. Patch by me. Reviewed by Tom Lane. Discussion: <CAHGQGwHWB3izc6cXuFLh5kOcAbFXaRhhgwd-X5PeN9TEjxqXwg@mail.gmail.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: http://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 http://www.postgresql.org/download/. For more information look at our web site located at http://www.postgresql.org/.