Github user ConeyLiu commented on a diff in the pull request:
https://github.com/apache/spark/pull/19586#discussion_r147368002
--- Diff:
core/src/main/scala/org/apache/spark/serializer/KryoSerializer.scala ---
@@ -205,11 +205,45 @@ class KryoSerializationStream(
private[this] var kryo: Kryo = serInstance.borrowKryo()
+ // This is only used when we write object and class separately.
+ var classWrote = false
--- End diff --
Yeah, it used for `writeAll / asIterator`. But for
`MemoryStorea.putIteratorAsBytes`, we don't use the writeAll, we use this state
to indicate whether we have written the class first.
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