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

    https://github.com/apache/spark/pull/13351#discussion_r65072973
  
    --- Diff: core/src/main/scala/org/apache/spark/util/Utils.scala ---
    @@ -2345,28 +2345,23 @@ private[spark] class RedirectThread(
      */
     private[spark] class CircularBuffer(sizeInBytes: Int = 10240) extends 
java.io.OutputStream {
       var pos: Int = 0
    -  var buffer = new Array[Int](sizeInBytes)
    +  var isBufferFull = false
    +  var buffer = new Array[Byte](sizeInBytes)
     
    -  def write(i: Int): Unit = {
    -    buffer(pos) = i
    +  def write(input: Int): Unit = {
    +    buffer(pos) = input.toByte
         pos = (pos + 1) % buffer.length
    +    isBufferFull = isBufferFull || (pos == 0)
       }
     
       override def toString: String = {
    -    val (end, start) = buffer.splitAt(pos)
    -    val input = new java.io.InputStream {
    -      val iterator = (start ++ end).iterator
    +    val end = new String(buffer, 0, pos, StandardCharsets.UTF_8)
    --- End diff --
    
    There could be a multibyte char encoding broken across end and start. I 
think we have to unfortunately build the whole byte array to convert and then 
read it as a string.


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