when520 commented on issue #3807:
URL: 
https://github.com/apache/incubator-dolphinscheduler/issues/3807#issuecomment-698774231


   > > > 我尝试使用dolphinscheduler框架现在实现的cron表达式无法实现状态的继续,您知道怎么利用现在的机制去实现我上边的描述吗?
   > > > The logic of cron is that if it exceeds 60, it will be reset. At the 
beginning of the time you set, every 59 will cause the next execution to exceed 
60. You can set it to execute every 2 minutes. Starting from 30 minutes, you 
probably know cron Logic
   > > > 
cron的逻辑是如果超过60就会重置,下个周期从你设置的时间的开始,每隔59都会导致下次执行超过60,你可以设置每隔2分钟执行,从30分钟开始,你就大概知道cron的逻辑
   > 
   > In addition, I want to know what kind of business needs you need to 
implement in this way
   > 另外,我想知道你们哪种业务场景,需要采用这种方式执行
   
   1.比如我们需要程序调起来的时候用当前的时间戳,往前倒20分钟,来确定读取的时间范围。
   
2.调度的程序就是需要持续之前的调度状态,但我们的dolphinscheduler就是不支持这样,很多调度平台都支持俩种定时器,一个是cron表达式,另外一种是可以持续状态的调度。


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