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Álvaro Herrera e6d6e32f42
Fix duplicate arbiter detection during REINDEX CONCURRENTLY on partitions 
Commit 90eae926a fixed ON CONFLICT handling during REINDEX CONCURRENTLY
on partitioned tables by treating unparented indexes as potential
arbiters.  However, there's a remaining race condition: when pg_inherits
records are swapped between consecutive calls to get_partition_ancestors(),
two different child indexes can appear to have the same parent, causing
duplicate entries in the arbiter list and triggering "invalid arbiter
index list" errors.

Note that this is not a new problem introduced by 90eae926a.  The same
error could occur before that commit in a slightly different scenario:
an index is selected during planning, then index_concurrently_swap()
commits, and a subsequent call to get_partition_ancestors() uses a new
catalog snapshot that sees zero ancestors for that index.

Fix by tracking which parent indexes have already been processed.  If a
subsequent call to get_partition_ancestors() returns a parent we've
already seen, treat that index as unparented instead, allowing it to be
matched via IsIndexCompatibleAsArbiter() like other concurrent reindex
scenarios.

Author: Mihail Nikalayeu <mihailnikalayeu@gmail.com>
Reported-by: Alexander Lakhin <exclusion@gmail.com>
Reviewed-by: Álvaro Herrera <alvherre@kurilemu.de>
Discussion: https://postgr.es/m/e5a8c1df-04e5-4343-85ef-5df2a7e3d90c@gmail.com
2026-01-28 14:38:53 +01:00
.github Add CODE_OF_CONDUCT.md, CONTRIBUTING.md, and SECURITY.md. 2024-07-02 13:03:58 -05:00
config Update copyright for 2026 2026-01-01 13:24:10 -05:00
contrib pgindent fix for 3fccbd94cb 2026-01-27 00:26:36 +01:00
doc Add support for "dependencies" in pg_restore_extended_stats() 2026-01-27 08:20:13 +09:00
src Fix duplicate arbiter detection during REINDEX CONCURRENTLY on partitions 2026-01-28 14:38:53 +01:00
.cirrus.star ci: Simplify ci-os-only handling 2025-08-14 12:09:34 -04:00
.cirrus.tasks.yml ci: Configure g++ with 32-bit for 32-bit build 2026-01-09 08:58:50 +01:00
.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
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aclocal.m4 autoconf: Move export_dynamic determination to configure 2022-12-06 18:55:28 -08:00
configure Detect if flags are needed for C++11 support 2026-01-22 09:09:25 +01:00
configure.ac Detect if flags are needed for C++11 support 2026-01-22 09:09:25 +01:00
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 Remove AIX support 2024-02-28 15:17:23 +04:00
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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/.