Github user zjffdu commented on the issue:
https://github.com/apache/zeppelin/pull/1970
This doesn't conform with spark. Spark don't allow property that doesn't
start with `spark.` [1]
If user want to use any properties in driver side, they should use
properties of Interpreter rather than SparkConf.
[1]
https://github.com/apache/spark/blob/master/core/src/main/scala/org/apache/spark/deploy/SparkSubmitArguments.scala#L132
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