Github user vanzin commented on a diff in the pull request:
https://github.com/apache/spark/pull/4688#discussion_r26966346
--- Diff: yarn/src/main/scala/org/apache/spark/deploy/yarn/Client.scala ---
@@ -540,6 +560,27 @@ private[spark] class Client(
amContainer
}
+ def setupCredentials(): Unit = {
+ if (args.principal != null) {
+ Preconditions.checkNotNull(
--- End diff --
sorry for flip-flopping here. The methods in `Preconditions` work weirdly
in Scala as you've noticed. Should probably use Scala's `require()` here (which
throws IllegalArgumentException, which is also a little more correct).
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