mirror of
https://github.com/timescale/timescaledb.git
synced 2025-05-17 11:03:36 +08:00
b77b47ada8
Previously, the scheduler only populated its jobs list once at start time. This commit enables the scheduler to receive notifications for updates (insert, update, delete) to the bgw_job table. Notifications are sent via the cache invalidation framework. Whenever the scheduler receives a notification, it re-reads the bgw_job table. For each job currently in the bgw_job table, it either instantiates new scheduler state for the job or copies over any existing scheduler state, for persisting jobs. For jobs that have disappeared from the bgw_job table, the scheduler deletes any local state it has. Note that any updates to the bgw_job table must now go through the C, so that the cache invalidation framework in catalog.c can run. In particular, this commit includes a rudimentary API for interacting with the bgw_job table, for testing purposes. This API will be rewritten in the future.
29 lines
1.4 KiB
SQL
29 lines
1.4 KiB
SQL
-- Copyright (c) 2016-2018 Timescale, Inc. All Rights Reserved.
|
|
--
|
|
-- This file is licensed under the Apache License, see LICENSE-APACHE
|
|
-- at the top level directory of the timescaledb distribution.
|
|
|
|
-- This file contains infrastructure for cache invalidation of TimescaleDB
|
|
-- metadata caches kept in C. Please look at cache_invalidate.c for a
|
|
-- description of how this works.
|
|
CREATE TABLE IF NOT EXISTS _timescaledb_cache.cache_inval_hypertable();
|
|
|
|
-- For notifying the scheduler of changes to the bgw_job table.
|
|
CREATE TABLE IF NOT EXISTS _timescaledb_cache.cache_inval_bgw_job();
|
|
|
|
-- This is pretty subtle. We create this dummy cache_inval_extension table
|
|
-- solely for the purpose of getting a relcache invalidation event when it is
|
|
-- deleted on DROP extension. It has no related triggers. When the table is
|
|
-- invalidated, all backends will be notified and will know that they must
|
|
-- invalidate all cached information, including catalog table and index OIDs,
|
|
-- etc.
|
|
CREATE TABLE IF NOT EXISTS _timescaledb_cache.cache_inval_extension();
|
|
|
|
-- not actually strictly needed but good for sanity as all tables should be dumped.
|
|
SELECT pg_catalog.pg_extension_config_dump('_timescaledb_cache.cache_inval_hypertable', '');
|
|
SELECT pg_catalog.pg_extension_config_dump('_timescaledb_cache.cache_inval_extension', '');
|
|
SELECT pg_catalog.pg_extension_config_dump('_timescaledb_cache.cache_inval_bgw_job', '');
|
|
|
|
GRANT SELECT ON ALL TABLES IN SCHEMA _timescaledb_cache TO PUBLIC;
|
|
|