mirror of
https://github.com/postgres/postgres.git
synced 2025-06-03 01:21:48 +03:00
59cea09f03
The invalidation of an active slot is done in two steps: - Termination of the backend holding it, if any. - Report that the slot is obsolete, with a conflict cause depending on the slot's data. This can be racy because between these two steps the slot mutex would be released while doing system calls, which means that the effective_xmin and effective_catalog_xmin could advance during that time, detecting a conflict cause different than the one originally wanted before the process owning a slot is terminated. Holding the mutex longer is not an option, so this commit changes the code to record the LSNs stored in the slot during the termination of the process owning the slot. Bonus thanks to Alexander Lakhin for the various tests and the analysis. Author: Bertrand Drouvot Reviewed-by: Michael Paquier, Bharath Rupireddy Discussion: https://postgr.es/m/ZaTjW2Xh+TQUCOH0@ip-10-97-1-34.eu-west-3.compute.internal Backpatch-through: 16
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/.