Github user felixcheung commented on the issue:
https://github.com/apache/spark/pull/14639
but to keep in mind, currently even spark.master can change while in-flight
- doesn't seem like Spark Scala code prevents that - we could get some very
wrong values. I'm not sure that is super reliable for this case.
```
> sparkR.session(spark.master="food")
Java ref type org.apache.spark.sql.SparkSession id 1
> sparkR.conf()
...
$spark.master
[1] "food"
...
```
(R example, ditto for Scala)
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