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Augment WAL records for btree delete with GetOldestXmin() to reduce

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false positives during Hot Standby conflict processing. Simple
patch to enhance conflict processing, following previous discussions.
Controlled by parameter minimize_standby_conflicts = on | off, with
default off allows measurement of performance impact to see whether
it should be set on all the time.
This commit is contained in:
Simon Riggs
2010-01-29 18:39:05 +00:00
parent d0cfc01823
commit 6d2bc0a6cf
6 changed files with 48 additions and 12 deletions
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13
src/backend/utils/misc/guc.c
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@ -10,7 +10,7 @@
* Written by Peter Eisentraut <peter_e@gmx.net>.
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/utils/misc/guc.c,v 1.536 2010/01/26 16:33:40 tgl Exp $
* $PostgreSQL: pgsql/src/backend/utils/misc/guc.c,v 1.537 2010/01/29 18:39:05 sriggs Exp $
*
*--------------------------------------------------------------------
*/
@ -1222,6 +1222,17 @@ static struct config_bool ConfigureNamesBool[] =
true, NULL, NULL
},
{
{"minimize_standby_conflicts", PGC_POSTMASTER, WAL_SETTINGS,
gettext_noop("Additional information is added to WAL records to"
" minimize the number of false positive cancelations"
" caused by recovery conflicts on WAL standby nodes."),
NULL
},
&MinimizeStandbyConflicts,
false, NULL, NULL
},
{
{"allow_system_table_mods", PGC_POSTMASTER, DEVELOPER_OPTIONS,
gettext_noop("Allows modifications of the structure of system tables."),