Github user cloud-fan commented on a diff in the pull request: https://github.com/apache/spark/pull/18343#discussion_r122620862 --- Diff: core/src/main/scala/org/apache/spark/scheduler/MapStatus.scala --- @@ -141,7 +141,7 @@ private[spark] class HighlyCompressedMapStatus private ( private[this] var numNonEmptyBlocks: Int, private[this] var emptyBlocks: RoaringBitmap, private[this] var avgSize: Long, - @transient private var hugeBlockSizes: Map[Int, Byte]) + private[this] var hugeBlockSizes: Map[Int, Byte]) --- End diff -- we do want to serialize `hugeBlockSizes`, but with customized logic, that why we marked it `@transient`. I think the corrected fix is, make this class implements `KryoSerializable`, and copy the customized serialization logic for `hugeBlockSizes` to kryo serialization hooks.
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