Github user mridulm commented on a diff in the pull request:
https://github.com/apache/spark/pull/16989#discussion_r115409843
--- Diff: core/src/main/scala/org/apache/spark/scheduler/MapStatus.scala ---
@@ -128,41 +130,52 @@ private[spark] class CompressedMapStatus(
* @param numNonEmptyBlocks the number of non-empty blocks
* @param emptyBlocks a bitmap tracking which blocks are empty
* @param avgSize average size of the non-empty blocks
+ * @param hugeBlockSizesArray sizes of huge blocks by their reduceId.
*/
private[spark] class HighlyCompressedMapStatus private (
private[this] var loc: BlockManagerId,
private[this] var numNonEmptyBlocks: Int,
private[this] var emptyBlocks: RoaringBitmap,
- private[this] var avgSize: Long)
+ private[this] var avgSize: Long,
+ private[this] var hugeBlockSizesArray: Array[Tuple2[Int, Byte]])
--- End diff --
Why does hugeBlockSizesArray exist ? Is it for efficient serializable ?
If yes, the then converting it into (Array[Int], Array[Byte]) would be
better (with each array written directly - not as Tupe2 object) - more below
though.
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