Github user yywwd commented on the issue:

    https://github.com/apache/zeppelin/pull/2231
  
    @zjffdu This issue is not related to the codes run in zeppelin. I mean, I 
cannot guarantee “Using Livy interpreter in Zeppelin”  and "Using 
Programmatic API" work well at the same time.
    
    Using Zeppelin, I just write codes like this:
    ```
    %livy.pyspark
    sc.version
    ```
    just test whether it works.
    
    
    Using Programmatic API, I just use official examples: 
https://github.com/apache/incubator-livy/blob/master/examples/src/main/python/pi_app.py
    
    **BUT!!!** 
    In **livy.spark.master yarn-cluster** mode zeppelin works, programmatic API 
cannot work
    In **livy.spark.master yarn** mode (the default mode), programmatic API 
works, zeppelin cannot work


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