Github user srowen commented on a diff in the pull request:
https://github.com/apache/spark/pull/22616#discussion_r222249333
--- Diff: core/src/main/scala/org/apache/spark/util/ClosureCleaner.scala ---
@@ -341,7 +340,7 @@ private[spark] object ClosureCleaner extends Logging {
// Clone the closure objects themselves, nulling out any fields that
are not
// used in the closure we're working on or any of its inner closures.
for ((cls, obj) <- outerPairs) {
- logDebug(s" + cloning the object $obj of class ${cls.getName}")
+ logDebug(s" + cloning the object of class ${cls.getName}")
--- End diff --
Nit: maybe "cloning instance of class .."
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