Github user HyukjinKwon commented on a diff in the pull request:
https://github.com/apache/spark/pull/22085#discussion_r211460405
--- Diff:
core/src/main/scala/org/apache/spark/api/python/PythonRunner.scala ---
@@ -20,15 +20,16 @@ package org.apache.spark.api.python
import java.io._
import java.net._
import java.nio.charset.StandardCharsets
+import java.nio.charset.StandardCharsets.UTF_8
import java.util.concurrent.atomic.AtomicBoolean
import scala.collection.JavaConverters._
-import org.apache.spark._
+import org.apache.spark.{SparkException, _}
import org.apache.spark.internal.Logging
+import org.apache.spark.security.SocketAuthHelper
import org.apache.spark.util._
-
--- End diff --
tiny nit: I would remove this one back while addressing other comments.
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