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Crash recovery on standby may encounter missing directories when replaying create database WAL records. Prior to this patch, the standby would fail to recover in such a case. However, the directories could be legitimately missing. Consider a sequence of WAL records as follows: CREATE DATABASE DROP DATABASE DROP TABLESPACE If, after replaying the last WAL record and removing the tablespace directory, the standby crashes and has to replay the create database record again, the crash recovery must be able to move on. This patch adds a mechanism similar to invalid-page tracking, to keep a tally of missing directories during crash recovery. If all the missing directory references are matched with corresponding drop records at the end of crash recovery, the standby can safely continue following the primary. Backpatch to 13, at least for now. The bug is older, but fixing it in older branches requires more careful study of the interactions with commit |
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README.git |
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/.