Github user mridulm commented on a diff in the pull request:
https://github.com/apache/spark/pull/16989#discussion_r115827377
--- Diff: core/src/main/scala/org/apache/spark/scheduler/MapStatus.scala ---
@@ -193,8 +215,18 @@ private[spark] object HighlyCompressedMapStatus {
} else {
0
}
+ val hugeBlockSizesArray = ArrayBuffer[Tuple2[Int, Byte]]()
+ if (numNonEmptyBlocks > 0) {
+ uncompressedSizes.zipWithIndex.foreach {
+ case (size, reduceId) =>
+ if (size > 2 * avgSize) {
--- End diff --
This is yet to be addressed - the scale constant `2`, and putting a lower
bound on `size`
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