diff --git a/core/src/main/scala/org/apache/spark/input/RawFileInput.scala b/core/src/main/scala/org/apache/spark/input/RawFileInput.scala
index 9c97f41097e52..e1caf9c44ec16 100644
--- a/core/src/main/scala/org/apache/spark/input/RawFileInput.scala
+++ b/core/src/main/scala/org/apache/spark/input/RawFileInput.scala
@@ -25,6 +25,7 @@ import org.apache.hadoop.mapreduce.lib.input.CombineFileSplit
 import org.apache.hadoop.mapreduce.RecordReader
 import org.apache.hadoop.mapreduce.TaskAttemptContext
 import org.apache.hadoop.fs.{ FSDataInputStream, Path }
+import org.apache.spark.annotation.DeveloperApi
 import org.apache.hadoop.mapreduce.lib.input.CombineFileInputFormat
 import org.apache.hadoop.mapreduce.JobContext
 import org.apache.hadoop.mapreduce.lib.input.CombineFileRecordReader
@@ -60,6 +61,7 @@ abstract class StreamFileInputFormat[T]
  * @note TaskAttemptContext is not serializable resulting in the confBytes construct
  * @note CombineFileSplit is not serializable resulting in the splitBytes construct
  */
+@DeveloperApi
 class PortableDataStream(@transient isplit: CombineFileSplit,
   @transient context: TaskAttemptContext, index: Integer)
   extends Serializable {
@@ -205,8 +207,7 @@ private[spark] class StreamRecordReader(
 }
 
 /**
- * A class for extracting the information from the file using the
- * BinaryRecordReader (as Byte array)
+ * The format for the PortableDataStream files
  */
 private[spark] class StreamInputFormat extends StreamFileInputFormat[PortableDataStream] {
   override def createRecordReader(split: InputSplit, taContext: TaskAttemptContext) =
@@ -216,22 +217,3 @@ private[spark] class StreamInputFormat extends StreamFileInputFormat[PortableDat
     }
 }
 
-/**
- * A [[org.apache.hadoop.mapreduce.RecordReader RecordReader]] for reading a single binary file
- * out in a key-value pair, where the key is the file path and the value is the entire content of
- * the file as a byte array
- */
-abstract class BinaryRecordReader[T](
-  split: CombineFileSplit,
-  context: TaskAttemptContext,
-  index: Integer)
-  extends StreamBasedRecordReader[T](split, context, index) {
-
-  def parseStream(inpStream: PortableDataStream): T = {
-    val inStream = inpStream.open()
-    val innerBuffer = ByteStreams.toByteArray(inStream)
-    Closeables.close(inStream, false)
-    parseByteArray(innerBuffer)
-  }
-  def parseByteArray(inArray: Array[Byte]): T
-}