Github user jaceklaskowski commented on the pull request:

    https://github.com/apache/spark/pull/8976#issuecomment-146506978
  
    Sure, but how do you know **now** how the public API is going to look like? 
It is **currently** causing troubles in understanding the code and we only 
**wish** / **hope** to have uses in the future.
    
    I'm all for this and very well understand the reasoning. Unless there are 
short-term plans to work on using `preferredNodeLocationData` (there's a task 
and plan for 1.6), I'll be advocating for removing it as it simply causes 
confusion and misunderstanding how Spark really works.


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