Github user andrewor14 commented on a diff in the pull request:
https://github.com/apache/spark/pull/3302#discussion_r20538541
--- Diff:
core/src/main/scala/org/apache/spark/util/collection/Spillable.scala ---
@@ -36,7 +36,11 @@ private[spark] trait Spillable[C] {
protected def spill(collection: C): Unit
// Number of elements read from input since last spill
- protected var elementsRead: Long
+ protected def elementsRead = _elementsRead
--- End diff --
I would keep the return type `: Long`
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