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Streaming replication can fetch any missing timeline history files from the master, but recovery would read the timeline history file for the target timeline before reading the checkpoint record, and before walreceiver has had a chance to fetch it from the master. Delay reading it, and the sanity checks involving timeline history, until after reading the checkpoint record. There is at least one scenario where this makes a difference: if you take a base backup from a standby server right after a timeline switch, the WAL segment containing the initial checkpoint record will begin with an older timeline ID. Without the timeline history file, recovering that file will fail as the older timeline ID is not recognized to be an ancestor of the target timeline. If you try to recover from such a backup, using only streaming replication to fetch the WAL, this patch is required for that to work. |
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| README.git | ||
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README
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. Changes between all PostgreSQL releases are recorded in the file HISTORY. 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/.