Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/18555#discussion_r126273429
--- Diff:
core/src/main/scala/org/apache/spark/internal/config/package.scala ---
@@ -51,29 +63,66 @@ package object config {
ConfigBuilder(SparkLauncher.EXECUTOR_EXTRA_LIBRARY_PATH).stringConf.createOptional
private[spark] val EXECUTOR_USER_CLASS_PATH_FIRST =
-
ConfigBuilder("spark.executor.userClassPathFirst").booleanConf.createWithDefault(false)
+ ConfigBuilder("spark.executor.userClassPathFirst")
+ .doc("Same functionality as spark.driver.userClassPathFirst, " +
+ "but applied to executor instances.")
+ .booleanConf
+ .checkValues(Set(false, true))
--- End diff --
ditto
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