arlanhon commented on issue #2581:
URL: 
https://github.com/apache/incubator-dolphinscheduler/issues/2581#issuecomment-621578670


   > At present, serial complement is a problem, it is recommended to use 
parallel complement
   
   Yes, some scenarios are currently not suitable for parallelism. For example, 
if my example above is parallel, some intermediate operations will be added or 
deleted.
   


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