Github user misutoth commented on a diff in the pull request:
https://github.com/apache/spark/pull/20853#discussion_r175539256
--- Diff:
core/src/test/scala/org/apache/spark/deploy/SparkSubmitSuite.scala ---
@@ -105,11 +105,17 @@ class SparkSubmitSuite
// Necessary to make ScalaTest 3.x interrupt a thread on the JVM like
ScalaTest 2.2.x
implicit val defaultSignaler: Signaler = ThreadSignaler
+ var dir: File = null
--- End diff --
I was thinking about this too. I wanted to avoid making it an Option or
doing a not very nice null check. I can do that later though...
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