vanzin commented on a change in pull request #25779: [SPARK-27468][core] Track 
correct storage level and mem/disk usage for RDDs.
URL: https://github.com/apache/spark/pull/25779#discussion_r329679204
 
 

 ##########
 File path: core/src/main/scala/org/apache/spark/status/LiveEntity.scala
 ##########
 @@ -269,13 +278,127 @@ private class LiveExecutor(val executorId: String, 
_addTime: Long) extends LiveE
   var usedOnHeap = 0L
   var usedOffHeap = 0L
 
+  /**
+   * RDD block info. Keeps track of which blocks are stored in this executor, 
to help with RDD usage
+   * accounting. This uses nested maps to make it easier to remove information 
when RDDs are
+   * unpersisted. First level key is the RDD id, second is the split index.
+   *
+   * This is a var so that we can "clear" it and restart with a new map when 
it becomes empty,
+   * to save some memory.
+   */
+  private var rddBlockUsage = new OpenHashMap[Int, RDDBlockTracker]()
 
 Review comment:
   No. You also missed the comment on the very previous line.

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