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Alexander Korotkov ad6ebcfcbb 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 06:52:33 +03:00
..
access Prevent GIN deleted pages from being reclaimed too early 2018-12-13 06:52:33 +03:00
bootstrap pgindent run for 9.5 2015-05-23 21:35:49 -04:00
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 09:30:57 -05:00
common Fix integer-overflow problems in interval comparison. 2017-04-05 23:51:28 -04:00
datatype Define integer limits independently from the system definitions. 2015-04-02 17:43:35 +02:00
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 Allow foreign and custom joins to handle EvalPlanQual rechecks. 2015-12-08 12:54:33 -05:00
lib Revert "Permit dump/reload of not-too-large >1GB tuples" 2016-12-06 12:45:49 -03:00
libpq Give nicer error message when connecting to a v10 server requiring SCRAM. 2017-05-05 11:24:12 +03:00
mb Teach UtfToLocal/LocalToUtf to support algorithmic encoding conversions. 2015-05-14 22:27:12 -04:00
nodes Change more places to be less trusting of RestrictInfo.is_pushed_down. 2018-04-20 15:19:17 -04:00
optimizer Fix incorrect handling of join clauses pushed into parameterized paths. 2018-04-19 15:49:12 -04:00
parser Fix INSERT ON CONFLICT UPDATE through a view that isn't just SELECT *. 2018-08-04 19:38:59 -04:00
port Remove overzeleous assertions in pg_atomic_flag code. 2018-04-07 18:30:15 -07:00
portability Use mmap MAP_NOSYNC option to limit shared memory writes 2015-03-21 22:06:19 -04:00
postmaster Mark assorted variables PGDLLIMPORT. 2017-12-05 09:30:57 -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 Fix creation of resjunk tlist entries for inherited mixed UPDATE/DELETE. 2017-11-27 17:54:11 -05:00
snowball Update copyright for 2015 2015-01-06 11:43:47 -05:00
storage PANIC on fsync() failure. 2018-11-19 14:13:22 +13:00
tcop Fix event triggers for partitioned tables 2018-10-06 19:17:46 -03:00
tsearch Fix statically allocated struct with FLEXIBLE_ARRAY_MEMBER member. 2015-02-20 17:50:18 -05:00
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 Allow btree comparison functions to return INT_MIN. 2018-10-05 16:01:30 -04:00
fmgr.h Revert addition of PGDLLEXPORT in PG_FUNCTION_INFO_V1 macro. 2016-10-12 18:02:03 -04:00
funcapi.h Add a utility function to extract variadic function arguments 2017-10-25 07:20:37 -04:00
getaddrinfo.h Update copyright for 2015 2015-01-06 11:43:47 -05:00
getopt_long.h Update copyright for 2015 2015-01-06 11:43:47 -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 09:30:57 -05:00
pg_config.h.in Back-patch updated thread flags tests into 9.4 and 9.5. 2018-11-19 14:24:51 -05:00
pg_config.h.win32 Stamp 9.5.15. 2018-11-05 16:49:29 -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 Update copyright for 2015 2015-01-06 11:43:47 -05:00
pg_trace.h Update copyright for 2015 2015-01-06 11:43:47 -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 20:21:32 -05:00
pgtime.h Mark assorted variables PGDLLIMPORT. 2017-12-05 09:30:57 -05:00
port.h On all Windows platforms, not just Cygwin, use _timezone and _tzname. 2018-05-01 12:02:41 -04:00
postgres.h Adjust DatumGetBool macro, this time for sure. 2016-04-28 11:51:08 -04:00
postgres_ext.h pgindent run for 9.4 2014-05-06 12:12:18 -04:00
postgres_fe.h Update copyright for 2015 2015-01-06 11:43:47 -05:00
rusagestub.h Update copyright for 2015 2015-01-06 11:43:47 -05:00
windowapi.h Update copyright for 2015 2015-01-06 11:43:47 -05:00