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If a walsender exits leaving data in reorderbuffers, the next walsender that tries to decode the same transaction would append its decoded data in the same spill files without truncating it first, which effectively duplicate the data. Avoid that by removing any leftover reorderbuffer spill files when a walsender starts. Backpatch to 9.4; this bug has been there from the very beginning of logical decoding. Author: Craig Ringer, revised by me Reviewed by: Álvaro Herrera, Petr Jelínek, Masahiko Sawada
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/.