lizhuigit commented on issue #2543:
URL: 
https://github.com/apache/incubator-dolphinscheduler/issues/2543#issuecomment-619940510


   
![image](https://user-images.githubusercontent.com/55183238/80369697-47a0af00-88c1-11ea-8625-a13737a36cd2.png)
   That's not what I'm saying. Like this, if c makes a mistake, B should keep 
going.Existing functions can only achieve parallel tasks do not terminate, 
serial can not。
   I want to realize that serial tasks can also ignore the state of the front 
node.The business scenario is that both A and C need to be executed, but 
eventually B must be executed, and only once.
   我想实现,串行任务也可以忽略前置节点状态。业务场景是A和C都需要执行,但最终一定要执行B,且只执行一次。


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