Github user vanzin commented on the issue:
https://github.com/apache/spark/pull/14959
The conf code looks kinda nasty with the checks for whether a JVM has been
set or not... I guess part of it is mandatory because otherwise this wouldn't
work, but in particular, I'm not so sure the `_set_jvm` code is necessary.
If you just say `self._conf = SparkConf(_jvm=self._jvm)` in `SparkContext`,
it should maintain the current behavior. Especially since the Scala
`SparkContext` clones the original user config - and if I read your code
correctly, you're not doing that here.
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