Github user xuanyuanking commented on a diff in the pull request:
https://github.com/apache/spark/pull/22855#discussion_r228716844
--- Diff:
core/src/test/scala/org/apache/spark/serializer/KryoSerializerSuite.scala ---
@@ -33,6 +33,7 @@ import org.apache.spark.serializer.KryoTest._
import org.apache.spark.storage.BlockManagerId
import org.apache.spark.util.Utils
+
--- End diff --
nit: extra empty line.
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