Github user rxin commented on a diff in the pull request:
https://github.com/apache/spark/pull/7403#discussion_r38230808
--- Diff: core/src/main/scala/org/apache/spark/Dependency.scala ---
@@ -76,6 +78,18 @@ class ShuffleDependency[K, V, C](
override def rdd: RDD[Product2[K, V]] =
_rdd.asInstanceOf[RDD[Product2[K, V]]]
+ /**
+ * The key, value and combiner classes are serialized so that shuffle
manager
+ * implementation can use the information to build
+ */
+ val keyClassName: String = reflect.classTag[K].runtimeClass.getName
+ val valueClassName: String = reflect.classTag[V].runtimeClass.getName
+ // Note: It's possible that the combiner class tag is null, if the
combineByKey
+ // methods in PairRDDFunctions are used instead of
combineByKeyWithClassTag.
+ val combinerClassName: String = Option(reflect.classTag[C]) match {
--- End diff --
change the type to Option[String]
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