Github user JoshRosen commented on a diff in the pull request:

    https://github.com/apache/spark/pull/3884#discussion_r23343038
  
    --- Diff: core/src/main/scala/org/apache/spark/SparkContext.scala ---
    @@ -1068,7 +1120,10 @@ class SparkContext(config: SparkConf) extends 
Logging with ExecutorAllocationCli
        * 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 getPersistentRDDs: Map[Int, RDD[_]] = persistentRdds.toMap
    --- End diff --
    
    This is safe, so I'll revert this error-checking.


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