Rename method per rxin feedback

core/src/main/scala/spark/SparkContext.scala

@@ -547,10 +547,10 @@ class SparkContext(
   }
 
   /**
-   * Returns an immutable map of RDDs that have marked themselves as cached via cache() call.
+   * Returns an immutable map of RDDs that have marked themselves as persistent via cache() call.
    * Note that this does not necessarily mean the caching or computation was successful.
    */
-  def getCachedRDDs: Map[Int, RDD[_]] = persistentRdds.toMap
+  def getPersistentRDDs: Map[Int, RDD[_]] = persistentRdds.toMap
 
   def getStageInfo: Map[Stage,StageInfo] = {
     dagScheduler.stageToInfos