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Michael Paquier c34f8078aa Ensure correct minimum consistent point on standbys 
Startup process has improved its calculation of incorrect minimum
consistent point in 8d68ee6, which ensures that all WAL available gets
replayed when doing crash recovery, and has introduced an incorrect
calculation of the minimum recovery point for non-startup processes,
which can cause incorrect page references on a standby when for example
the background writer flushed a couple of pages on-disk but was not
updating the control file to let a subsequent crash recovery replay to
where it should have.

The only case where this has been reported to be a problem is when a
standby needs to calculate the latest removed xid when replaying a btree
deletion record, so one would need connections on a standby that happen
just after recovery has thought it reached a consistent point.  Using a
background worker which is started after the consistent point is reached
would be the easiest way to get into problems if it connects to a
database.  Having clients which attempt to connect periodically could
also be a problem, but the odds of seeing this problem are much lower.

The fix used is pretty simple, as the idea is to give access to the
minimum recovery point written in the control file to non-startup
processes so as they use a reference, while the startup process still
initializes its own references of the minimum consistent point so as the
original problem with incorrect page references happening post-promotion
with a crash do not show up.

Reported-by: Alexander Kukushkin
Diagnosed-by: Alexander Kukushkin
Author: Michael Paquier
Reviewed-by: Kyotaro Horiguchi, Alexander Kukushkin
Discussion: https://postgr.es/m/153492341830.1368.3936905691758473953@wrigleys.postgresql.org
Backpatch-through: 9.3
2018-08-31 11:03:55 -07:00
config LLVMJIT: LLVMGetHostCPUFeatures now is upstream, use LLMV version if available. 2018-08-24 10:21:48 -07:00
contrib Enforce cube dimension limit in all cube construction functions 2018-08-31 20:24:20 +03:00
doc pg_verify_checksums: rename -d to --verbose 2018-08-30 06:31:05 -03:00
src Ensure correct minimum consistent point on standbys 2018-08-31 11:03:55 -07:00
.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 Add configure infrastructure (--with-llvm) to enable LLVM support. 2018-03-20 17:26:25 -07:00
configure LLVMJIT: LLVMGetHostCPUFeatures now is upstream, use LLMV version if available. 2018-08-24 10:21:48 -07:00
configure.in Stamp 11beta3. 2018-08-06 16:02:42 -04:00
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/.