Github user jinxing64 commented on a diff in the pull request: https://github.com/apache/spark/pull/16989#discussion_r115519964 --- 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]]) extends MapStatus with Externalizable { + @transient var hugeBlockSizes: Map[Int, Byte] = + if (hugeBlockSizesArray == null) null else hugeBlockSizesArray.toMap + // loc could be null when the default constructor is called during deserialization require(loc == null || avgSize > 0 || numNonEmptyBlocks == 0, "Average size can only be zero for map stages that produced no output") - protected def this() = this(null, -1, null, -1) // For deserialization only + protected def this() = this(null, -1, null, -1, null) // For deserialization only override def location: BlockManagerId = loc override def getSizeForBlock(reduceId: Int): Long = { if (emptyBlocks.contains(reduceId)) { 0 } else { - avgSize + hugeBlockSizes.get(reduceId) match { --- End diff -- Yes, I should refine.
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