Github user JoshRosen commented on a diff in the pull request:
https://github.com/apache/spark/pull/7403#discussion_r34623901
--- Diff: core/src/main/scala/org/apache/spark/Dependency.scala ---
@@ -65,7 +67,7 @@ abstract class NarrowDependency[T](_rdd: RDD[T]) extends
Dependency[T] {
* @param mapSideCombine whether to perform partial aggregation (also
known as map-side combine)
*/
@DeveloperApi
-class ShuffleDependency[K, V, C](
+class ShuffleDependency[K: ClassTag, V: ClassTag, C: ClassTag](
--- End diff --
FYI, this is a binary-incompatible change to a DeveloperAPI.
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