Github user jkbradley commented on the issue:

    https://github.com/apache/spark/pull/16623
  
    Thanks for the comments.  I definitely agree with many of your combined 
statements:
    * R has not been declared stable.  (Though where in the docs is this even 
stated?  I was unable to find anything saying it is an alpha component.)
    * Some changes are necessary and OK, such as APIs which simply do not work.
    * We could still be stricter about some API changes.
    
    If I'm a user of SparkR, I agree I'd expect it to be less stable than the 
rest of Spark.  But apparent instability from changing APIs can also scare away 
users from putting SparkR into actual use.  It's a balance, but I'd prefer to 
err on the side of stability.
    
    I do like the idea of tagging backports, but it's Ok with me not to as long 
as there is proper explanation of the reason within the JIRA.


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