Github user namanmishra91 commented on the issue:

    https://github.com/apache/zeppelin/pull/2619
  
    @zjffdu 
    
    > What we need to do it to run it blocking way.
    
    The  code does exactly that. It might look complicated overall as a lot of 
code is related to handling and passing of sequential run state to UI. For 
backend changes, please check `runAllParagraphsSequentially()` in 
`NotebookServer.java`. 
    
    In a gist, sequential run is ultimately performed by 
`SequentialNoteRunner.java` which basically runs a paragraph, blocks until it 
is complete and then submits the next one. If it helps, I can divide this into 
2 PRs : one for backend only changes and another for integration with frontend.


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