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

    https://github.com/apache/spark/pull/6361#discussion_r31449691
  
    --- Diff: 
core/src/main/scala/org/apache/spark/util/SerializableBuffer.scala ---
    @@ -21,12 +21,16 @@ import java.io.{EOFException, IOException, 
ObjectInputStream, ObjectOutputStream
     import java.nio.ByteBuffer
     import java.nio.channels.Channels
     
    +import com.esotericsoftware.kryo.{Kryo, KryoSerializable}
    +import com.esotericsoftware.kryo.io.{Input, Output}
    +
     /**
      * A wrapper around a java.nio.ByteBuffer that is serializable through 
Java serialization, to make
      * it easier to pass ByteBuffers in case class messages.
      */
     private[spark]
    -class SerializableBuffer(@transient var buffer: ByteBuffer) extends 
Serializable {
    +class SerializableBuffer(@transient var buffer: ByteBuffer)
    +  extends Serializable with KryoSerializable {
    --- End diff --
    
    yes, see eg. the test for registration of HighlyCompressedMapStatus in 
`KryoSerializerSuite`.


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