Github user dongjoon-hyun commented on a diff in the pull request: https://github.com/apache/spark/pull/22179#discussion_r214762021 --- Diff: core/src/test/scala/org/apache/spark/serializer/KryoSerializerSuite.scala --- @@ -412,6 +412,26 @@ class KryoSerializerSuite extends SparkFunSuite with SharedSparkContext { assert(!ser2.getAutoReset) } + test("ClassCastException when writing a Map after previously " + --- End diff -- Since this is a bug fix test case, could you add `SPARK-25176` like `SPARK-25176 ClassCastException ...`?
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