Github user felixcheung commented on a diff in the pull request:
https://github.com/apache/spark/pull/14784#discussion_r77051296
--- Diff: R/pkg/R/sparkR.R ---
@@ -365,6 +365,10 @@ sparkR.session <- function(
}
overrideEnvs(sparkConfigMap, paramMap)
}
+ if (nzchar(master)) {
+ assign("spark.master", master, envir = sparkConfigMap)
--- End diff --
Right, I think that could go either way
```
scala> val a = SparkSession.builder().master("yarn").config("spark.master",
"local[3]").getOrCreate()
scala> a.conf.get("master")
java.util.NoSuchElementException: master
scala> a.conf.get("spark.master")
res8: String = local[3]
```
I think the current R implementation mimic the programmatic behavior rather
than commandline.
We could certainly change it - just want to highlight this is a breaking
change if we are to silently flip the precedence order, and would think we
should avoid unless if we have reason to.
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