Question

有没有办法告诉celerybeat在特定任务运行时更改设置？

本例中最好地说明了这种效用：

我有一个定期任务，每隔30秒检查一次值。有时，基于外部触发器（我无法预测），我希望此任务将轮询频率提高到10秒 - 持续几分钟。

这是否可行以可管理的方式进行？我知道我可以更改任务配置并重新加载芹菜，但这似乎是一种混乱的做事方式......

Answer 1

在schedules.py模块上，您将找到：

class schedule(object):

    def is_due(self, last_run_at):
        """Returns tuple of two items `(is_due, next_time_to_run)`,
        where next time to run is in seconds.

        e.g.

        * `(True, 20)`, means the task should be run now, and the next
            time to run is in 20 seconds.

        * `(False, 12)`, means the task should be run in 12 seconds.

        You can override this to decide the interval at runtime,
        but keep in mind the value of :setting:`CELERYBEAT_MAX_LOOP_INTERVAL`,
        which decides the maximum number of seconds celerybeat can sleep
        between re-checking the periodic task intervals.  So if you
        dynamically change the next run at value, and the max interval is
        set to 5 minutes, it will take 5 minutes for the change to take
        effect, so you may consider lowering the value of
        :setting:`CELERYBEAT_MAX_LOOP_INTERVAL` if responsiveness is of
        importance to you.

        .. admonition:: Scheduler max interval variance

        The default max loop interval may vary for different schedulers.
        For the default scheduler the value is 5 minutes, but for e.g.
        the django-celery database scheduler the value is 5 seconds.

        """
        last_run_at = self.maybe_make_aware(last_run_at)
        rem_delta = self.remaining_estimate(last_run_at)
        rem = timedelta_seconds(rem_delta)
        if rem == 0:
            return True, self.seconds
        return False, rem

因此，您可以覆盖is_due方法来设置自己的timedelta。

动态改变芹菜节拍设置

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