Github user andrewor14 commented on a diff in the pull request: https://github.com/apache/spark/pull/7403#discussion_r39082265 --- Diff: core/src/main/scala/org/apache/spark/Dependency.scala --- @@ -76,6 +78,15 @@ 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: Option[String] = Option(reflect.classTag[C]).map(_.runtimeClass.getName) --- End diff -- let's not change the `registerShuffle` API
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