Github user zjffdu commented on the issue:

    https://github.com/apache/zeppelin/pull/2619
  
    @namanmishra91 Thanks for the contribution. But the implementation is a 
little complicated to me. I think the easiest implementation is just run 
paragraphs sequentially in backend. Look at the following code.
    
https://github.com/apache/zeppelin/blob/master/zeppelin-server/src/main/java/org/apache/zeppelin/socket/NotebookServer.java#L1681
    `persistAndExecuteSingleParagraph` run paragraph in non-blocking way. What 
we need to do it to run it blocking way. 

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