Github user zsxwing commented on the issue:
https://github.com/apache/spark/pull/18490
I cannot reproduce this issue. Could you provide a unit test to reproduce
this?
Anyway, I suggest using `kryo.register(classOf[HighlyCompressedMapStatus],
new KryoJavaSerializer())` to force Kryo using Java serialization so that we
don't need to worry about if the Kryo default serializer works or not.
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