Github user ConeyLiu commented on a diff in the pull request:
https://github.com/apache/spark/pull/19586#discussion_r147709649
--- 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
+
override def writeObject[T: ClassTag](t: T): SerializationStream = {
kryo.writeClassAndObject(output, t)
--- End diff --
From the code, it just write a `varInt` if the class have been registered.
And also there need some calculation for getting the `varInt`. But from the
test, the overhead looks more serious than I expected.
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