Github user HyukjinKwon commented on the issue:

    https://github.com/apache/spark/pull/19630
  
    which, for example, shows the coverage like this:
    
    ![2017-11-17 4 53 
16](https://user-images.githubusercontent.com/6477701/32936608-47f1fefa-cbb8-11e7-965d-f19119a8314b.png)
    
    The difficulty is to enable it for workers too ... if anyone does not know 
the easy way let me share mine .. I am ashamed to share it actually .. 


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