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Álvaro Herrera 4abf615cc8
Backpatch critical performance fixes to pgarch.c 
This backpatches commits beb4e9ba16 and 1fb17b1903 (originally
appearing in previously in REL_15_STABLE) to REL_14_STABLE.  Performance
of the WAL archiver can become pretty critical at times, and reports
exist of users getting in serious trouble (hours of downtime, loss of
replicas) because of lack of this optimization.

We'd like to backpatch these to REL_13_STABLE too, but because of the
very invasive changes made by commit d75288fb27 in the 14 timeframe,
we deem it too risky :-(

Original commit messages appear below.

Discussion: https://postgr.es/m/202411131605.m66syq5i5ucl@alvherre.pgsql

  commit beb4e9ba16
  Author:     Robert Haas <rhaas@postgresql.org>
  AuthorDate: Thu Nov 11 15:02:53 2021 -0500

  Improve performance of pgarch_readyXlog() with many status files.

  Presently, the archive_status directory was scanned for each file to
  archive.  When there are many status files, say because archive_command
  has been failing for a long time, these directory scans can get very
  slow.  With this change, the archiver remembers several files to archive
  during each directory scan, speeding things up.

  To ensure timeline history files are archived as quickly as possible,
  XLogArchiveNotify() forces the archiver to do a new directory scan as
  soon as the .ready file for one is created.

  Nathan Bossart, per a long discussion involving many people. It is
  not clear to me exactly who out of all those people reviewed this
  particular patch.

  Discussion: http://postgr.es/m/CA+TgmobhAbs2yabTuTRkJTq_kkC80-+jw=pfpypdOJ7+gAbQbw@mail.gmail.com
  Discussion: http://postgr.es/m/620F3CE1-0255-4D66-9D87-0EADE866985A@amazon.com

  commit 1fb17b1903
  Author:     Tom Lane <tgl@sss.pgh.pa.us>
  AuthorDate: Wed Dec 29 17:02:50 2021 -0500

  Fix issues in pgarch's new directory-scanning logic.

  The arch_filenames[] array elements were one byte too small, so that
  a maximum-length filename would get corrupted if another entry
  were made after it.  (Noted by Thomas Munro, fix by Nathan Bossart.)

  Move these arrays into a palloc'd struct, so that we aren't wasting
  a few kilobytes of static data in each non-archiver process.

  Add a binaryheap_reset() call to make it plain that we start the
  directory scan with an empty heap.  I don't think there's any live
  bug of that sort, but it seems fragile, and this is very cheap
  insurance.

  Cleanup for commit beb4e9ba1, so no back-patch needed.

  Discussion: https://postgr.es/m/CA+hUKGLHAjHuKuwtzsW7uMJF4BVPcQRL-UMZG_HM-g0y7yLkUg@mail.gmail.com
2024-12-12 16:21:18 +01:00
config Log LLVM library version in configure output. 2023-10-22 14:29:00 +13:00
contrib Count contrib/bloom index scans in pgstat view. 2024-11-12 20:57:37 -05:00
doc Doc: fix incorrect EXPLAIN ANALYZE output for bloom indexes 2024-12-10 09:26:34 +13:00
src Backpatch critical performance fixes to pgarch.c 2024-12-12 16:21:18 +01:00
.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 Backpatch addition of .git-blame-ignore-revs 2022-08-05 19:36:24 +02:00
.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 If a C23 compiler is detected, try asking for C17. 2024-11-27 15:48:13 +13:00
configure.ac If a C23 compiler is detected, try asking for C17. 2024-11-27 15:48:13 +13:00
COPYRIGHT Update copyright for 2024 2024-01-03 20:49:04 -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/.