postgresql

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Alexander Korotkov 9aa94d8536 Fix deadlock in GIN vacuum introduced by `218f51584d` Before `218f51584d` if posting tree page is about to be deleted, then the whole posting tree is locked by LockBufferForCleanup() on root preventing all the concurrent inserts. `218f51584d` reduced locking to the subtree containing page to be deleted. However, due to concurrent parent split, inserter doesn't always holds pins on all the pages constituting path from root to the target leaf page. That could cause a deadlock between GIN vacuum process and GIN inserter. And we didn't find non-invasive way to fix this. This commit reverts VACUUM behavior to lock the whole posting tree before delete any page. However, we keep another useful change by `218f51584d`: the tree is locked only if there are pages to be deleted. Reported-by: Chen Huajun Diagnosed-by: Chen Huajun, Andrey Borodin, Peter Geoghegan Discussion: https://postgr.es/m/31a702a.14dd.166c1366ac1.Coremail.chjischj%40163.com Author: Alexander Korotkov, based on ideas from Andrey Borodin and Peter Geoghegan Reviewed-by: Andrey Borodin Backpatch-through: 10		2018-12-13 06:15:23 +03:00
config	Postpone LLVM-related uses of AC_CHECK_DECLS.	2018-11-19 12:43:05 -05:00
contrib	Repair bogus EPQ plans generated for postgres_fdw foreign joins.	2018-12-12 16:08:30 -05:00
doc	Doc: improve documentation about ALTER LARGE OBJECT requirements.	2018-12-11 11:21:50 -05:00
src	Fix deadlock in GIN vacuum introduced by `218f51584d`	2018-12-13 06:15:23 +03:00
.dir-locals.el	Update documentation editor setup instructions	2018-07-13 21:28:18 +02:00
.gitattributes	Remove contrib/tsearch2.	2017-02-13 11:06:11 -05:00
.gitignore	Support for optimizing and emitting code in LLVM JIT provider.	2018-03-22 11:05:22 -07:00
aclocal.m4	Fix configure's AC_CHECK_DECLS tests to work correctly with clang.	2018-11-19 12:01:47 -05:00
configure	Postpone LLVM-related uses of AC_CHECK_DECLS.	2018-11-19 12:43:05 -05:00
configure.in	Postpone LLVM-related uses of AC_CHECK_DECLS.	2018-11-19 12:43:05 -05:00
COPYRIGHT	Update copyright for 2018	2018-01-02 23:30:12 -05:00
GNUmakefile.in	Ensure we build generated headers at the start of some more cases.	2018-07-30 18:04:39 -04:00
HISTORY	Change documentation references to PG website to use https: not http:	2017-05-20 21:50:47 -04:00
Makefile	Fix non-GNU makefiles for AIX make.	2017-11-30 00:57:22 -08:00
README	Change documentation references to PG website to use https: not http:	2017-05-20 21:50:47 -04:00
README.git	Change documentation references to PG website to use https: not http:	2017-05-20 21:50:47 -04:00

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/.