Github user JoshRosen commented on a diff in the pull request:
https://github.com/apache/spark/pull/10534#discussion_r48688026
--- Diff: core/src/main/scala/org/apache/spark/SparkContext.scala ---
@@ -295,8 +295,7 @@ class SparkContext(config: SparkConf) extends Logging
with ExecutorAllocationCli
private[spark] val addedJars = HashMap[String, Long]()
// Keeps track of all persisted RDDs
- private[spark] val persistentRdds = new TimeStampedWeakValueHashMap[Int,
RDD[_]]
- private[spark] def metadataCleaner: MetadataCleaner = _metadataCleaner
+ private[spark] val persistentRdds = new
MapMaker().weakValues().makeMap[Int, RDD[_]]().asScala
--- End diff --
I'll add a comment here to clarify that MapMaker returns a
ConcurrentHashMap (or will just use an explicit return type, if Guava supports
that).
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