Collect statistics about conflicts in logical replication.
This commit adds columns in view pg_stat_subscription_stats to show the
number of times a particular conflict type has occurred during the
application of logical replication changes. The following columns are
added:
confl_insert_exists:
Number of times a row insertion violated a NOT DEFERRABLE unique
constraint.
confl_update_origin_differs:
Number of times an update was performed on a row that was
previously modified by another origin.
confl_update_exists:
Number of times that the updated value of a row violates a
NOT DEFERRABLE unique constraint.
confl_update_missing:
Number of times that the tuple to be updated is missing.
confl_delete_origin_differs:
Number of times a delete was performed on a row that was
previously modified by another origin.
confl_delete_missing:
Number of times that the tuple to be deleted is missing.
The update_origin_differs and delete_origin_differs conflicts can be
detected only when track_commit_timestamp is enabled.
Author: Hou Zhijie
Reviewed-by: Shveta Malik, Peter Smith, Anit Kapila
Discussion: https://postgr.es/m/OS0PR01MB57160A07BD575773045FC214948F2@OS0PR01MB5716.jpnprd01.prod.outlook.com
Branch
------
master
Details
-------
https://git.postgresql.org/pg/commitdiff/6c2b5edecc0d6c936e27775c9451d32bb3141c90
Modified Files
--------------
doc/src/sgml/logical-replication.sgml | 17 +++---
doc/src/sgml/monitoring.sgml | 77 +++++++++++++++++++++++-
src/backend/catalog/system_views.sql | 6 ++
src/backend/replication/logical/conflict.c | 5 +-
src/backend/utils/activity/pgstat_subscription.c | 17 ++++++
src/backend/utils/adt/pgstatfuncs.c | 33 +++++++---
src/include/catalog/catversion.h | 2 +-
src/include/catalog/pg_proc.dat | 6 +-
src/include/pgstat.h | 4 ++
src/include/replication/conflict.h | 8 +++
src/test/regress/expected/rules.out | 8 ++-
src/test/subscription/t/026_stats.pl | 61 +++++++++++++------
12 files changed, 204 insertions(+), 40 deletions(-)
