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54ed0d5c05
Currently, the next start of a scheduled background job is calculated by adding the `schedule_interval` to its finish time. This does not allow scheduling jobs to execute at fixed times, as the next execution is "shifted" by the job duration. This commit introduces the option to execute a job on a fixed schedule instead. Users are expected to provide an initial_start parameter on which subsequent job executions are aligned. The next start is calculated by computing the next time_bucket of the finish time with initial_start origin. An `initial_start` parameter is added to the compression, retention, reorder and continuous aggregate `add_policy` signatures. By passing that upon policy creation users indicate the policy will execute on a fixed schedule, or drifting schedule if `initial_start` is not provided. To allow users to pick a drifting schedule when registering a UDA, an additional parameter `fixed_schedule` is added to `add_job` to allow users to specify the old behavior by setting it to false. Additionally, an optional TEXT parameter, `timezone`, is added to both add_job and add_policy signatures, to address the 1-hour shift in execution time caused by DST switches. As internally the next start of a fixed schedule job is calculated using time_bucket, the timezone parameter allows using timezone-aware buckets to calculate the next start.
42 lines
1.7 KiB
SQL
42 lines
1.7 KiB
SQL
-- This file and its contents are licensed under the Apache License 2.0.
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-- Please see the included NOTICE for copyright information and
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-- LICENSE-APACHE for a copy of the license.
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CREATE OR REPLACE FUNCTION @extschema@.add_job(
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proc REGPROC,
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schedule_interval INTERVAL,
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config JSONB DEFAULT NULL,
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initial_start TIMESTAMPTZ DEFAULT NULL,
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scheduled BOOL DEFAULT true,
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check_config REGPROC DEFAULT NULL,
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fixed_schedule BOOL DEFAULT TRUE,
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timezone TEXT DEFAULT NULL
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) RETURNS INTEGER AS '@MODULE_PATHNAME@', 'ts_job_add' LANGUAGE C VOLATILE;
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CREATE OR REPLACE FUNCTION @extschema@.delete_job(job_id INTEGER) RETURNS VOID AS '@MODULE_PATHNAME@', 'ts_job_delete' LANGUAGE C VOLATILE STRICT;
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CREATE OR REPLACE PROCEDURE @extschema@.run_job(job_id INTEGER) AS '@MODULE_PATHNAME@', 'ts_job_run' LANGUAGE C;
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-- Returns the updated job schedule values
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CREATE OR REPLACE FUNCTION @extschema@.alter_job(
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job_id INTEGER,
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schedule_interval INTERVAL = NULL,
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max_runtime INTERVAL = NULL,
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max_retries INTEGER = NULL,
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retry_period INTERVAL = NULL,
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scheduled BOOL = NULL,
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config JSONB = NULL,
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next_start TIMESTAMPTZ = NULL,
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if_exists BOOL = FALSE,
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check_config REGPROC = NULL
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)
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RETURNS TABLE (job_id INTEGER, schedule_interval INTERVAL, max_runtime INTERVAL, max_retries INTEGER, retry_period INTERVAL, scheduled BOOL, config JSONB,
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next_start TIMESTAMPTZ, check_config TEXT)
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AS '@MODULE_PATHNAME@', 'ts_job_alter'
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LANGUAGE C VOLATILE;
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CREATE OR REPLACE FUNCTION _timescaledb_internal.alter_job_set_hypertable_id(
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job_id INTEGER,
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hypertable REGCLASS )
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RETURNS INTEGER AS '@MODULE_PATHNAME@', 'ts_job_alter_set_hypertable_id'
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LANGUAGE C VOLATILE;
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