春天的@Scheduled（fixedDelay =…）在午夜停止

Question

I have a Spring Boot application that uses a @Scheduled annotation with a fixed delay. The annotation is used in different classes with different delays. However, at midnight every day all scheduled tasks stop running.

Does anyone know why this might be happening? I can't find any explanation online.

(I am using version 2.0.2.RELEASE of Spring Boot and 5.0.6.RELEASE of Spring Core.)

Thanks in advance!

Answer 1

I'm not sure what do you mean about stopping running.

But the first work you need to do is starting your schedules on different threads and put them into a queue.

If stopping means suspending for a while,then you create a new schedule that make other schedules sleep some time at midnight.Maybe the new schedule should have be started when the thread are sleeping,and the way to prevent is to make sure only one schedule(I mean same kind of schedule) could be put in the queue at the same time.

If you just mean kill all other schedule at midnight,you just need to start your midnight schedules and kill others.

So sorry about my poor English,hope this could help you.

Answer 2

@Scheduled(fixedDelay = 1000)
 void scheduleFixedDelayTask() {
   System.out.println(
  "Fixed delay task - " + System.currentTimeMillis() / 
 1000);
  }

In this case, the duration between the end of last execution and the start of next execution is fixed. The task always waits until the previous one is finished.

This option should be used when it's mandatory that the previous execution is completed before running again.

So maintain the delay such a way that the previous execution completed.

Hope it helps.

Answer 3

Thanks to everyone who replied.

As it turns out, this was not an issue with Spring. It appeared the tasks stopped because the logs stopped. What really happened was that our scripts that tail the logs were not smart enough to handle log files that roll at midnight (face palm).