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Michael Paquier ea4744782b Fix rare instability in recovery TAP test 004_timeline_switch 
This fixes a problem similar to ad8c86d22c.  In this case, the test
could fail under the following circumstances:
- The primary is stopped with teardown_node(), meaning that it may not
be able to send all its WAL records to standby_1 and standby_2.
- If standby_2 receives more records than standby_1, attempting to
reconnect standby_2 to the promoted standby_1 would fail because of a
timeline fork.

This race condition is fixed with a simple trick: instead of tearing
down the primary, it is stopped cleanly so as all the WAL records of the
primary are received and flushed by both standby_1 and standby_2.  Once
we do that, there is no need for a wait_for_catchup() before stopping
the node.  The test wants to check that a timeline jump can be achieved
when reconnecting a standby to a promoted standby in the same cluster,
hence an immediate stop of the primary is not required.

This failure is harder to reach than the previous instability of
009_twophase, still the buildfarm has been able to detect this failure
at least once.  I have tried Alexander Lakhin's test trick with the
bgwriter and very aggressive standby snapshots, but I could not
reproduce it directly.  It is reachable, as the buildfarm has proved.

Backpatch down to all supported branches, and this problem can lead to
spurious failures in the buildfarm.

Discussion: https://postgr.es/m/493401a8-063f-436a-8287-a235d9e065fc@gmail.com
Backpatch-through: 14
2026-03-05 10:05:44 +09:00
.github Add CODE_OF_CONDUCT.md, CONTRIBUTING.md, and SECURITY.md. 2024-07-02 13:03:58 -05:00
config Support using copyObject in standard C++ 2026-03-02 11:48:13 +01:00
contrib Fix local-variable shadowing in pg_trgm's printSourceNFA(). 2026-03-02 14:40:29 -05:00
doc Change default value of default_toast_compression to "lz4", take two 2026-03-05 09:24:35 +09:00
src Fix rare instability in recovery TAP test 004_timeline_switch 2026-03-05 10:05:44 +09:00
.cirrus.star ci: Simplify ci-os-only handling 2025-08-14 12:09:34 -04:00
.cirrus.tasks.yml Revert "Change default value of default_toast_compression to "lz4"" 2026-03-05 08:25:35 +09:00
.cirrus.yml ci: Per-repo configuration for manually trigger tasks 2025-08-14 11:54:03 -04:00
.dir-locals.el Make Emacs perl-mode indent more like perltidy. 2019-01-13 11:32:31 -08:00
.editorconfig Update .editorconfig and .gitattributes for postgresql.conf.sample. 2025-11-18 10:28:36 -06:00
.git-blame-ignore-revs Add commit 7b24959434 to .git-blame-ignore-revs. 2026-03-02 13:23:28 -06:00
.gitattributes Update .editorconfig and .gitattributes for postgresql.conf.sample. 2025-11-18 10:28:36 -06:00
.gitignore Update top-level .gitignore. 2022-12-04 15:23:00 -05:00
.mailmap Add a Git .mailmap file 2024-11-05 13:56:02 +01:00
aclocal.m4 autoconf: Move export_dynamic determination to configure 2022-12-06 18:55:28 -08:00
configure Revert "Change default value of default_toast_compression to "lz4"" 2026-03-05 08:25:35 +09:00
configure.ac Revert "Change default value of default_toast_compression to "lz4"" 2026-03-05 08:25:35 +09:00
COPYRIGHT Update copyright for 2026 2026-01-01 13:24:10 -05:00
GNUmakefile.in Allow selecting the git revision to be packaged by "make dist". 2024-05-03 11:08:50 -04:00
HISTORY Canonicalize some URLs 2020-02-10 20:47:50 +01:00
Makefile Restore AIX support. 2026-02-23 13:34:22 -05:00
meson.build Support using copyObject in standard C++ 2026-03-02 11:48:13 +01:00
meson_options.txt Update copyright for 2026 2026-01-01 13:24:10 -05:00
README.md Revise the style of a paragraph in README.md. 2024-03-21 10:16:41 -05:00

README.md

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.

Copyright and license information can be found in the file COPYRIGHT.

General documentation about this version of PostgreSQL can be found at https://www.postgresql.org/docs/devel/. In particular, information about building PostgreSQL from the source code can be found at https://www.postgresql.org/docs/devel/installation.html.

The latest version of this software, and related software, may be obtained at https://www.postgresql.org/download/. For more information look at our web site located at https://www.postgresql.org/.