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postgresql/src/include
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Alexander Korotkov 1cf175c74f Prevent GIN deleted pages from being reclaimed too early 
When GIN vacuum deletes a posting tree page, it assumes that no concurrent
searchers can access it, thanks to ginStepRight() locking two pages at once.
However, since 9.4 searches can skip parts of posting trees descending from the
root.  That leads to the risk that page is deleted and reclaimed before
concurrent search can access it.

This commit prevents the risk of above by waiting for every transaction, which
might wait to reference this page, to finish.  Due to binary compatibility
we can't change GinPageOpaqueData to store corresponding transaction id.
Instead we reuse page header pd_prune_xid field, which is unused in index pages.

Discussion: https://postgr.es/m/31a702a.14dd.166c1366ac1.Coremail.chjischj%40163.com
Author: Andrey Borodin, Alexander Korotkov
Reviewed-by: Alexander Korotkov
Backpatch-through: 9.4
2018-12-13 06:52:26 +03:00
..
access Prevent GIN deleted pages from being reclaimed too early 2018-12-13 06:52:26 +03:00
bootstrap Fix off-by-one loop count in MapArrayTypeName, and get rid of static array. 2014-12-16 15:35:36 -05:00
catalog Fix missing role dependencies for some schema and type ACLs. 2018-11-09 20:42:03 -05:00
commands Mark assorted variables PGDLLIMPORT. 2017-12-05 09:35:15 -05:00
common Fix integer-overflow problems in interval comparison. 2017-04-05 23:51:28 -04:00
datatype pgindent run for 9.4 2014-05-06 12:12:18 -04:00
executor Fix failure with initplans used conditionally during EvalPlanQual rechecks. 2018-09-15 13:42:34 -04:00
fe_utils Empty search_path in Autovacuum and non-psql/pgbench clients. 2018-02-26 07:39:48 -08:00
foreign Update copyright for 2014 2014-01-07 16:05:30 -05:00
lib pgindent run for 9.4 2014-05-06 12:12:18 -04:00
libpq Give nicer error message when connecting to a v10 server requiring SCRAM. 2017-05-05 11:24:29 +03:00
mb pgindent run for 9.4 2014-05-06 12:12:18 -04:00
nodes Fix failure with initplans used conditionally during EvalPlanQual rechecks. 2018-09-15 13:42:34 -04:00
optimizer Fix incorrect handling of join clauses pushed into parameterized paths. 2018-04-19 15:49:12 -04:00
parser pgindent run for 9.4 2014-05-06 12:12:18 -04:00
port Support building with Visual Studio 2015 2018-09-11 15:44:42 -04:00
portability pgindent run for 9.4 2014-05-06 12:12:18 -04:00
postmaster Mark assorted variables PGDLLIMPORT. 2017-12-05 09:35:15 -05:00
regex Suppress compiler warnings about useless comparison of unsigned to zero. 2016-02-15 17:11:52 -05:00
replication Fix "base" snapshot handling in logical decoding 2018-06-26 16:38:34 -04:00
rewrite pgindent run for 9.4 2014-05-06 12:12:18 -04:00
snowball pgindent run for 9.4 2014-05-06 12:12:18 -04:00
storage PANIC on fsync() failure. 2018-11-19 14:26:28 +13:00
tcop Mark assorted variables PGDLLIMPORT. 2017-12-05 09:35:15 -05:00
tsearch Allow opclasses to provide tri-valued GIN consistent functions. 2014-03-12 17:51:30 +02:00
utils Fix missing role dependencies for some schema and type ACLs. 2018-11-09 20:42:03 -05:00
.gitignore Autoconfiscate selection of 64-bit int type for 64-bit large object API. 2012-10-07 21:52:43 -04:00
c.h Fix float-to-integer coercions to handle edge cases correctly. 2018-11-24 12:45:50 -05:00
fmgr.h Revert addition of PGDLLEXPORT in PG_FUNCTION_INFO_V1 macro. 2016-10-12 18:02:12 -04:00
funcapi.h Add a utility function to extract variadic function arguments 2017-10-25 07:20:48 -04:00
getaddrinfo.h Fix assorted issues in client host name lookup. 2014-04-02 17:11:24 -04:00
getopt_long.h Centralize getopt-related declarations in a new header file pg_getopt.h. 2014-02-15 14:31:30 -05:00
Makefile Empty search_path in Autovacuum and non-psql/pgbench clients. 2018-02-26 07:39:48 -08:00
miscadmin.h Mark assorted variables PGDLLIMPORT. 2017-12-05 09:35:15 -05:00
pg_config.h.in Back-patch updated thread flags tests into 9.4 and 9.5. 2018-11-19 14:24:52 -05:00
pg_config.h.win32 Stamp 9.4.20. 2018-11-05 16:51:23 -05:00
pg_config_ext.h.in Autoconfiscate selection of 64-bit int type for 64-bit large object API. 2012-10-07 21:52:43 -04:00
pg_config_ext.h.win32 Autoconfiscate selection of 64-bit int type for 64-bit large object API. 2012-10-07 21:52:43 -04:00
pg_config_manual.h Further reduce the number of semaphores used under --disable-spinlocks. 2016-04-18 13:33:07 -04:00
pg_getopt.h Fix comment. 2014-05-08 12:42:56 -04:00
pg_trace.h Update copyright for 2014 2014-01-07 16:05:30 -05:00
pgstat.h Don't reset changes_since_analyze after a selective-columns ANALYZE. 2016-06-06 17:44:17 -04:00
pgtar.h Adopt the GNU convention for handling tar-archive members exceeding 8GB. 2015-11-21 20:22:39 -05:00
pgtime.h Mark assorted variables PGDLLIMPORT. 2017-12-05 09:35:15 -05:00
port.h On all Windows platforms, not just Cygwin, use _timezone and _tzname. 2018-09-12 12:24:11 -04:00
postgres.h Adjust DatumGetBool macro, this time for sure. 2016-04-28 11:51:13 -04:00
postgres_ext.h pgindent run for 9.4 2014-05-06 12:12:18 -04:00
postgres_fe.h Update copyright for 2014 2014-01-07 16:05:30 -05:00
rusagestub.h Update copyright for 2014 2014-01-07 16:05:30 -05:00
windowapi.h Update copyright for 2014 2014-01-07 16:05:30 -05:00