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Motivation

I sometimes find the scheduler might be duplicate triggered.

This might happen when ProcessScheduleTask has a bad performance or the isolation levels is incorrect or we use incorrect quartz parameters.

The said thing is that we don't have any metrics to monitor whether there exist duplicate fired.

Design Detail

Add a new table t_ds_schedule_instance to record the scheduler fired instance.

CREATE TABLE `t_ds_schedule_instance` (
  `id` int NOT NULL AUTO_INCREMENT COMMENT 'key',
  `schedule_id` int NOT NULL,
   `workflow_instance_id` int NOT NULL,
  `expect_fire_time` bigint NOT NULL,
  `actual_fire_time` bigint NOT NULL,
  `create_time` datetime NOT NULL,
  PRIMARY KEY (`id`),
  UNIQUE KEY `uk_t_ds_schedule_si_eft` (`schedule_id`,`expect_fire_time`)
) ENGINE=InnoDB AUTO_INCREMENT=60 DEFAULT CHARSET=utf8mb3

Each record in this table represend a success fired of quartz.

Once the scheduler triggered success we will insert a ScheduleInstance, if there exist duplicate record will throw exception from db.

Compatibility, Deprecation, and Migration Plan

Compatibility with previous version, since the table is newly created.

Test Plan

Test by IT.

Code of Conduct

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