Github user srowen commented on a diff in the pull request:
https://github.com/apache/spark/pull/22894#discussion_r229812240
--- Diff: core/src/main/scala/org/apache/spark/scheduler/MapStatus.scala ---
@@ -189,13 +190,12 @@ private[spark] class HighlyCompressedMapStatus
private (
emptyBlocks.readExternal(in)
avgSize = in.readLong()
val count = in.readInt()
- val hugeBlockSizesArray = mutable.ArrayBuffer[Tuple2[Int, Byte]]()
+ hugeBlockSizes = new util.HashMap[Int, Byte](count).asScala
--- End diff --
Does calling `HashMap.sizeHint(...)` here actually help?
I'd stick to the scala collection for now
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