Github user HyukjinKwon commented on a diff in the pull request:

    https://github.com/apache/spark/pull/20424#discussion_r168076901
  
    --- Diff: 
core/src/main/scala/org/apache/spark/api/python/PythonWorkerFactory.scala ---
    @@ -17,7 +17,7 @@
     
     package org.apache.spark.api.python
     
    -import java.io.{DataInputStream, DataOutputStream, InputStream, 
OutputStreamWriter}
    +import java.io._
    --- End diff --
    
    BTW, don't forget to get rid of this import change too. This import looks 
needed due to `IOException`.


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