Github user squito commented on a diff in the pull request:
https://github.com/apache/spark/pull/4220#discussion_r23776203
--- Diff:
core/src/test/scala/org/apache/spark/util/ResetSystemProperties.scala ---
@@ -42,7 +43,7 @@ private[spark] trait ResetSystemProperties extends
BeforeAndAfterEach { this: Su
var oldProperties: Properties = null
override def beforeEach(): Unit = {
- oldProperties = new Properties(System.getProperties)
+ oldProperties = SerializationUtils.clone(System.getProperties)
--- End diff --
thanks for tracking this down. can you please put a comment in here
explaining why you need a clone? it is really subtle, I can easily see this
getting reverted down the road if somebody doesn't know why its there.
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