Github user srowen commented on the issue:

    https://github.com/apache/spark/pull/21930
  
    I can imagine it is binary-compatible because the change is just to generic 
types, that are erased here (no ClassTags or anything). 
    
    To be clear about source compatibility, do I have this right?
    - The change to addTaskCompletionListener callers is necessary for 2.12 
callers
    - It isn't necessary for 2.11 callers
    - It's necessary for Spark because it compiles against both


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