Github user vanzin commented on the issue:
https://github.com/apache/spark/pull/14022
> if someone adds a spark conf that doesn't start with "spark.", which I
think is allowed by spark conf.
Well, it is and it isn't. You can't set non-`spark.` configs from
spark-submit or system properties. But you can set them directly in the code.
In general, Spark completely ignores anything that does not start with `spark.`
so I think that's ok here.
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