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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