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Prior to this patch, when running pg_receivewal, the streaming start point would be the current location of the archives if anything is found in the local directory where WAL segments are written, and pg_receivewal would fall back to the current WAL flush location if there are no archives, as of the result of an IDENTIFY_SYSTEM command. If for some reason the WAL files from pg_receivewal were moved, it is better to try a restart where we left at, which is the replication slot's restart_lsn instead of skipping right to the current flush location, to avoid holes in the WAL backed up. This commit changes pg_receivewal to use the following sequence of methods to determine the starting streaming LSN: - Scan the local archives. - Use the slot's restart_lsn, if supported by the backend and if a slot is defined. - Fallback to the current flush LSN as reported by IDENTIFY_SYSTEM. To keep compatibility with older server versions, we only attempt to use READ_REPLICATION_SLOT if the backend version is at least 15, and fallback to the older behavior of streaming from the current flush LSN if the command is not supported. Some TAP tests are added to cover this feature. Author: Ronan Dunklau Reviewed-by: Kyotaro Horiguchi, Michael Paquier, Bharath Rupireddy Discussion: https://postgr.es/m/18708360.4lzOvYHigE@aivenronan |
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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: 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/.