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

    https://github.com/apache/spark/pull/14959#discussion_r80564836
  
    --- Diff: python/pyspark/conf.py ---
    @@ -149,35 +161,53 @@ def setAll(self, pairs):
             :param pairs: list of key-value pairs to set
             """
             for (k, v) in pairs:
    -            self._jconf.set(k, v)
    +            self.set(k, v)
             return self
     
         def get(self, key, defaultValue=None):
             """Get the configured value for some key, or return a default 
otherwise."""
             if defaultValue is None:   # Py4J doesn't call the right get() if 
we pass None
    -            if not self._jconf.contains(key):
    -                return None
    -            return self._jconf.get(key)
    +            if self._jconf:
    +                if not self._jconf.contains(key):
    +                    return None
    +                return self._jconf.get(key)
    +            else:
    +                if key not in self._conf:
    +                    return None
    +                return self._conf[key]
             else:
    -            return self._jconf.get(key, defaultValue)
    +            if self._jconf:
    +                return self._jconf.get(key, defaultValue)
    +            else:
    +                return self._conf.get(key, defaultValue)
     
         def getAll(self):
             """Get all values as a list of key-value pairs."""
             pairs = []
    -        for elem in self._jconf.getAll():
    -            pairs.append((elem._1(), elem._2()))
    +        if self._jconf:
    +            for elem in self._jconf.getAll():
    +                pairs.append((elem._1(), elem._2()))
    +        else:
    +            for k, v in self._conf.items():
    +                pairs.append((k, v))
    --- End diff --
    
    This could be simplified:
    
    ```python
    if self._jconf is not None:
        return [(elem._1(), elem._2()) for elem in self._jconf.getAll()]
    else:
        return self._conf.items()


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