More visiblity clean-up

Author: pwendell

core/src/main/scala/org/apache/spark/storage/BlockManager.scala

@@ -35,11 +35,11 @@ import org.apache.spark.network._
 import org.apache.spark.serializer.Serializer
 import org.apache.spark.util._
 
-sealed trait Values
+private[spark] sealed trait Values
 
-case class ByteBufferValues(buffer: ByteBuffer) extends Values
-case class IteratorValues(iterator: Iterator[Any]) extends Values
-case class ArrayBufferValues(buffer: ArrayBuffer[Any]) extends Values
+private[spark] case class ByteBufferValues(buffer: ByteBuffer) extends Values
+private[spark]case class IteratorValues(iterator: Iterator[Any]) extends Values
+private[spark]case class ArrayBufferValues(buffer: ArrayBuffer[Any]) extends Values
 
 private[spark] class BlockManager(
     executorId: String,

core/src/main/scala/org/apache/spark/storage/StoragePerfTester.scala

@@ -25,7 +25,7 @@ import org.apache.spark.serializer.KryoSerializer
 import org.apache.spark.util.Utils
 
 /**
- * Utility for micro-benchmarking shuffle write performance.
+ * Internal utility for micro-benchmarking shuffle write performance.
  *
  * Writes simulated shuffle output from several threads and records the observed throughput.
  */

core/src/main/scala/org/apache/spark/util/Distribution.scala

@@ -69,7 +69,7 @@ private[spark] class Distribution(val data: Array[Double], val startIdx: Int, va
   }
 }
 
-object Distribution {
+private[spark] object Distribution {
 
   def apply(data: Traversable[Double]): Option[Distribution] = {
     if (data.size > 0) {