Github user maasg commented on the issue:

    https://github.com/apache/spark/pull/21188
  
    Hi Jerry, 
    I don't think the issue is solved with this patch. I plugged the new 
function in my notebook and it still shows a rather flat ramp-up: 
    
![image](https://user-images.githubusercontent.com/874997/39434014-b06b52b4-4c97-11e8-871e-3064cbdc101f.png)
    
    I created a PR with an alternative rate computation: 
https://github.com/apache/spark/pull/21194
    Could you have a look?


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