Github user jinxing64 commented on a diff in the pull request:

    https://github.com/apache/spark/pull/16989#discussion_r111734780
  
    --- Diff: core/src/main/scala/org/apache/spark/scheduler/MapStatus.scala ---
    @@ -133,36 +135,53 @@ 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 hugeBlockSizes: HashMap[Int, Byte])
       extends MapStatus with Externalizable {
     
       // 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
    +  def this() = this(null, -1, null, -1, null)  // For deserialization only
    --- End diff --
    
    Remove the `protected` and make this visible for test.


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