mridulm commented on a change in pull request #30691:
URL: https://github.com/apache/spark/pull/30691#discussion_r629810563



##########
File path: core/src/main/scala/org/apache/spark/Dependency.scala
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@@ -96,12 +96,27 @@ class ShuffleDependency[K: ClassTag, V: ClassTag, C: 
ClassTag](
   val shuffleHandle: ShuffleHandle = 
_rdd.context.env.shuffleManager.registerShuffle(
     shuffleId, this)
 
+  // By default, shuffle merge is enabled for ShuffleDependency if push based 
shuffle is enabled
+  private[this] var _shuffleMergeEnabled = 
Utils.isPushBasedShuffleEnabled(rdd.sparkContext.getConf)
+
+  def setShuffleMergeEnabled(shuffleMergeEnabled: Boolean): Unit = {

Review comment:
       `private[spark]` ?




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