Github user cloud-fan commented on a diff in the pull request: https://github.com/apache/spark/pull/18343#discussion_r122636117 --- Diff: core/src/main/scala/org/apache/spark/scheduler/MapStatus.scala --- @@ -141,8 +143,8 @@ 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]) - extends MapStatus with Externalizable { + @transient private[this] var hugeBlockSizes: Map[Int, Byte]) + extends MapStatus with Externalizable with KryoSerializable { --- End diff -- I think the previous version already worked... When we have `writeExternal` and `readExternal`, `@transient` doesn't matter for java serializer, so removing `@transient` to make it work with kryo is a valid fix
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