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Michael Paquier b81d08d600 Fix handling of synchronous replication for stopping WAL senders 
This fixes an oversight from c6c3334 which has introduced a more strict
ordering in the way WAL senders are stopped to prevent current WAL
activity when a shutdown checkpoint is created.  After all backends are
stopped, all WAL senders are requested to stop which makes them stop any
activity, and switching their state as stopping.  Once the checkpointer
knows that all WAL senders are in a stopping state, the shutdown
checkpoint can begin, with all WAL senders activated, waiting for their
clients to flush the shutdown checkpoint record.

If a subset of WAL senders are stopping and in a sync state, other WAL
senders could still be waiting for a WAL position to be synced while
committing a transaction, however the subset of stopping senders would
not release waiters, potentially breaking synchronous replication
guarantees.  This commit makes sure that even WAL senders stopping are
able to release waiters properly.

On 9.4, this can also trigger an assertion failure when setting for
example max_wal_senders to 1 where a WAL sender is not able to find
itself as in synchronous state when the instance stops.

Reported-by: Paul Guo
Author: Paul Guo, Michael Paquier
Discussion: https://postgr.es/m/CAEET0ZEv8VFqT3C-cQm6byOB4r4VYWcef1J21dOX-gcVhCSpmA@mail.gmail.com
Backpatch-through: 9.4
2018-11-29 09:13:04 +09:00
config Back-patch updated thread flags tests into 9.4 and 9.5. 2018-11-19 14:24:52 -05:00
contrib Fix hstore hash function for empty hstores upgraded from 8.4. 2018-11-24 21:17:09 +00:00
doc doc: fix wording for plpgsql, add "and" 2018-11-26 19:41:21 -05:00
src Fix handling of synchronous replication for stopping WAL senders 2018-11-29 09:13:04 +09:00
.dir-locals.el Update Emacs configuration 2013-08-13 20:08:44 -04:00
.gitattributes gitattributes: Ignore time zone data files for whitespace checks 2014-07-22 00:12:28 -04:00
.gitignore Add /config.cache to .gitignore in back branches 2017-02-25 13:04:22 -05:00
aclocal.m4 Back-patch updated thread flags tests into 9.4 and 9.5. 2018-11-19 14:24:52 -05:00
configure Back-patch updated thread flags tests into 9.4 and 9.5. 2018-11-19 14:24:52 -05:00
configure.in Back-patch updated thread flags tests into 9.4 and 9.5. 2018-11-19 14:24:52 -05:00
COPYRIGHT Update copyright for 2018 2018-01-02 23:30:12 -05:00
GNUmakefile.in Add TAP tests for client programs 2014-04-14 21:33:46 -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 00:57:32 -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/.