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Michael Paquier 1346794feb 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 10:06:08 +09:00
config Allow PG_PRINTF_ATTRIBUTE to be different in C and C++ code. 2026-02-25 11:57:26 -05:00
contrib postgres_fdw: Fix thinko in comment for UserMappingPasswordRequired(). 2026-02-27 17:05:06 +09:00
doc doc: Clarify that empty COMMENT string removes the comment. 2026-03-03 14:47:41 +09:00
src Fix rare instability in recovery TAP test 004_timeline_switch 2026-03-05 10:06:08 +09:00
.abi-compliance-history Update .abi-compliance-history for PrepareToInvalidateCacheTuple(). 2025-12-17 09:48:56 -08:00
.dir-locals.el Make Emacs perl-mode indent more like perltidy. 2019-01-13 11:32:31 -08:00
.editorconfig Add .editorconfig 2019-12-18 09:13:13 +01:00
.git-blame-ignore-revs Add previous commit to .git-blame-ignore-revs. 2025-10-21 10:02:19 -05:00
.gitattributes Exclude LLVM files from whitespace checks 2024-11-27 11:10:00 +01:00
.gitignore Add portlock directory to .gitignore 2022-11-26 07:47:06 -05:00
aclocal.m4 Probe $PROVE not $PERL while checking for modules needed by TAP tests. 2021-11-22 12:54:52 -05:00
configure Allow PG_PRINTF_ATTRIBUTE to be different in C and C++ code. 2026-02-25 11:57:26 -05:00
configure.ac Allow PG_PRINTF_ATTRIBUTE to be different in C and C++ code. 2026-02-25 11:57:26 -05:00
COPYRIGHT Update copyright for 2026 2026-01-01 13:24:09 -05:00
GNUmakefile.in Remove temporary portlock directory during make [dist]clean. 2022-11-26 10:30:53 -05:00
HISTORY Canonicalize some URLs 2020-02-10 20:47:50 +01:00
Makefile Don't unset MAKEFLAGS in non-GNU Makefile. 2019-06-25 09:36:21 +12:00
README Canonicalize some URLs 2020-02-10 20:47:50 +01:00
README.git Canonicalize some URLs 2020-02-10 20:47:50 +01:00

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:

	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/.