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In quorum-based synchronous replication, all the standbys listed in synchronous_standby_names equally have chances to be chosen as synchronous standbys. So they should have the same priority. However, previously, quorum standbys whose names appear earlier in the list were given higher priority values though the difference of those priority values didn't affect the selection of synchronous standbys. Users could see those "meaningless" priority values in pg_stat_replication and this was confusing. This commit gives all the quorum synchronous standbys the same highest priority, i.e., 1, in order to remove such confusion. Author: Fujii Masao Reviewed-by: Masahiko Sawada, Kyotaro Horiguchi Discussion: http://postgr.es/m/CAHGQGwEKOw=SmPLxJzkBsH6wwDBgOnVz46QjHbtsiZ-d-2RGUg@mail.gmail.com |
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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/.