Github user JoshRosen commented on a diff in the pull request:

    https://github.com/apache/spark/pull/21437#discussion_r191881226
  
    --- Diff: python/pyspark/taskcontext.py ---
    @@ -88,3 +89,9 @@ def taskAttemptId(self):
             TaskAttemptID.
             """
             return self._taskAttemptId
    +
    +    def getLocalProperty(self, key):
    +        """
    +        Get a local property set upstream in the driver, or None if it is 
missing.
    --- End diff --
    
    FWIW we can always evolve what you have here towards the 
`getLocalProperty(key, default=None)` case; that evolution would maintain 
behavior and source compatibility. Therefore maybe it's fine to defer that 
until later if we're not sure whether that variant is useful.


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