srowen commented on a change in pull request #23685: 
[SPARK-26771][CORE][GRAPHX] Make .unpersist(), .destroy() consistently 
non-blocking by default
URL: https://github.com/apache/spark/pull/23685#discussion_r251863830
 
 

 ##########
 File path: core/src/main/scala/org/apache/spark/SparkContext.scala
 ##########
 @@ -1753,7 +1753,7 @@ class SparkContext(config: SparkConf) extends Logging {
   /**
    * Unpersist an RDD from memory and/or disk storage
    */
-  private[spark] def unpersistRDD(rddId: Int, blocking: Boolean = true) {
+  private[spark] def unpersistRDD(rddId: Int, blocking: Boolean) {
 
 Review comment:
   This is a private method and its optional arg value is always specified, so, 
I removed the default to avoid confusion.

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