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| author | Andres Freund <andres@anarazel.de> | 2023-04-07 23:11:28 -0700 |
|---|---|---|
| committer | Andres Freund <andres@anarazel.de> | 2023-04-08 00:05:44 -0700 |
| commit | 26669757b6a7665c1069e77e6472bd8550193ca6 (patch) | |
| tree | b60b91e8fa8276744b171a7a5714ffb5b8918f66 /doc | |
| parent | be87200efd9308ccfe217ce8828f316e93e370da (diff) | |
| download | postgresql-26669757b6a7665c1069e77e6472bd8550193ca6.tar.gz | |
Handle logical slot conflicts on standby
During WAL replay on the standby, when a conflict with a logical slot is
identified, invalidate such slots. There are two sources of conflicts:
1) Using the information added in 6af1793954e, logical slots are invalidated if
required rows are removed
2) wal_level on the primary server is reduced to below logical
Uses the infrastructure introduced in the prior commit. FIXME: add commit
reference.
Change InvalidatePossiblyObsoleteSlot() to use a recovery conflict to
interrupt use of a slot, if called in the startup process. The new recovery
conflict is added to pg_stat_database_conflicts, as confl_active_logicalslot.
See 6af1793954e for an overall design of logical decoding on a standby.
Bumps catversion for the addition of the pg_stat_database_conflicts column.
Bumps PGSTAT_FILE_FORMAT_ID for the same reason.
Author: "Drouvot, Bertrand" <bertranddrouvot.pg@gmail.com>
Author: Andres Freund <andres@anarazel.de>
Author: Amit Khandekar <amitdkhan.pg@gmail.com> (in an older version)
Reviewed-by: "Drouvot, Bertrand" <bertranddrouvot.pg@gmail.com>
Reviewed-by: Andres Freund <andres@anarazel.de>
Reviewed-by: Robert Haas <robertmhaas@gmail.com>
Reviewed-by: FabrÃzio de Royes Mello <fabriziomello@gmail.com>
Reviewed-by: Bharath Rupireddy <bharath.rupireddyforpostgres@gmail.com>
Reviewed-by: Amit Kapila <amit.kapila16@gmail.com>
Reviewed-by: Alvaro Herrera <alvherre@alvh.no-ip.org>
Discussion: https://postgr.es/m/20230407075009.igg7be27ha2htkbt@awork3.anarazel.de
Diffstat (limited to 'doc')
| -rw-r--r-- | doc/src/sgml/monitoring.sgml | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/doc/src/sgml/monitoring.sgml b/doc/src/sgml/monitoring.sgml index 0eaff70dcb..e8ab803267 100644 --- a/doc/src/sgml/monitoring.sgml +++ b/doc/src/sgml/monitoring.sgml @@ -4742,6 +4742,17 @@ SELECT pid, wait_event_type, wait_event FROM pg_stat_activity WHERE wait_event i deadlocks </para></entry> </row> + + <row> + <entry role="catalog_table_entry"><para role="column_definition"> + <structfield>confl_active_logicalslot</structfield> <type>bigint</type> + </para> + <para> + Number of uses of logical slots in this database that have been + canceled due to old snapshots or a too low <xref linkend="guc-wal-level"/> + on the primary + </para></entry> + </row> </tbody> </tgroup> </table> |