Github user mgaido91 commented on a diff in the pull request:
https://github.com/apache/spark/pull/22894#discussion_r231155000
--- Diff: core/src/main/scala/org/apache/spark/scheduler/MapStatus.scala ---
@@ -149,7 +150,7 @@ private[spark] class HighlyCompressedMapStatus private (
private[this] var numNonEmptyBlocks: Int,
private[this] var emptyBlocks: RoaringBitmap,
private[this] var avgSize: Long,
- private var hugeBlockSizes: Map[Int, Byte])
+ private[this] var hugeBlockSizes: mutable.Map[Int, Byte])
--- End diff --
yes, you're right. I just checked the implementation of the `MapBuilder`...
Seems like there is no efficient way to build an immutable map... I am fine
with the approach you're proposing using `scala.collection.Map`, but still
seems a bit hacky to me.
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