Github user andrewor14 commented on the pull request:
https://github.com/apache/spark/pull/7066#issuecomment-116935528
In general I think we discourage the developers to set additional variables
in the `SparkConf` after the `SparkContext` has started. Unfortunately this
still happens sometimes especially in YARN. I think it's the simpler approach
here, otherwise we'll have to worry about executors potentially getting
different properties, which is much more confusing.
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