presto-main/src/main/java/io/prestosql/execution/TaskManagementExecutor.java/TaskManagementExecutor/TaskManagementExecutor
class TaskManagementExecutor:    public TaskManagementExecutor()
    {
        taskManagementExecutor = newScheduledThreadPool(5, threadsNamed("task-management-%s"));
        taskManagementExecutorMBean = new ThreadPoolExecutorMBean((ThreadPoolExecutor) taskManagementExecutor);
    }