[GitHub] [dolphinscheduler] mgsky1 opened a new pull request #6272: [Feature-5752][server & UI]Add blocking task

[GitBox]

mgsky1 opened a new pull request #6272:
URL: https://github.com/apache/dolphinscheduler/pull/6272


   This PR is reference to 
issue[#5752](https://github.com/apache/dolphinscheduler/issues/5752)
   
   ## Brief changelog
   
   This PR contains two parts: 
   
   - Blocking task java code 
   - Blocking task UT
   
   These changes are based on ds 2.0 architecture. 
   
   ## Brief Introduction
   
   > Note: The screen shoots come from my 
[add-blocking-task-dev](https://github.com/mgsky1/dolphinscheduler/tree/add-blocking-task-dev)
 which based on ds 1.x architecture.
   
   In this part, serval pictures with simple introduction will let you know 
what blocking task looks like.
   
   Now, suppose we have a work flow:
   
   <img width="648" alt="demo-01" 
src="https://user-images.githubusercontent.com/23556693/132489372-b7ab2bc4-1afe-4c4a-89b0-412de3b2aa87.png";>
   
   The node with dolphin icon is a blocking node. It will check weather the 
execution process meet our requirement.
   
   The blocking node settings UI is shown below
   
   <img width="710" alt="demo-02" 
src="https://user-images.githubusercontent.com/23556693/132489456-e4952c13-b8ef-420a-848f-b7f0b0521fef.png";>
   
   We can choose blocking condition, alert option and edit blocking logic in 
custom parameters.
   
   Now, I will show you THREE scenarios: None-Blocking, Blocking-with-No-Alert, 
Blocking-with-Alert
   
   None Blocking:
   
   <img width="737" alt="demo-03" 
src="https://user-images.githubusercontent.com/23556693/132489553-1b657e31-7dab-4ccc-83f9-793261785714.png";>
   
   Blocking-with-No-Alert
   
   The process will be paused and the tasks after blocking node will not be 
submitted.
   
   <img width="1215" alt="demo-04" 
src="https://user-images.githubusercontent.com/23556693/132489621-e481ee13-97b8-4c6c-be26-52a6bdec3e36.png";>
   
   <img width="1208" alt="demo-05" 
src="https://user-images.githubusercontent.com/23556693/132489652-8fa59017-905d-40d7-9d89-e7cf0ebfa0c2.png";>
   
   Blocking-with-Alert
   
   After the process blocked, an email will be sent to you
   
   <img width="915" alt="demo-06" 
src="https://user-images.githubusercontent.com/23556693/132489705-fecb9403-93e9-44c1-a6eb-a28c7816d85f.png";>
   


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