npawar opened a new pull request #3622: Start and stop ControllerPeriodicTasks based on leadership changes URL: https://github.com/apache/incubator-pinot/pull/3622 Currently the ControllerPeriodicTasks are scheduled on all controllers , everytime checking for leadership, and executing on their schedule if on a leader controller. This makes it difficult for us to control when the periodic tasks can start and stop. When lead controller changes, it is desirable that the services restart on the new leader, and gracefully shutdown immediately on the old leader. Introducing a ControllerPeriodicTasksScheduler and making it a subscriber of LeadershipChangeSubscriber. This will enable the scheduler to start the periodic tasks on a controller whenever it becomes leader, as well as stop the tasks on a controller who lost leadership.
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