svn merge -c 1242891 from trunk for HDFS-2931.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-0.23@1242892 13f79535-47bb-0310-9956-ffa450edef68

hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt

@@ -13,6 +13,9 @@ Release 0.23.2 - UNRELEASED
 
   IMPROVEMENTS
 
+    HDFS-2931. Switch DataNode's BlockVolumeChoosingPolicy to private-audience.
+    (harsh via szetszwo)
+
   OPTIMIZATIONS
 
   BUG FIXES

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/BlockVolumeChoosingPolicy.java

@@ -28,10 +28,12 @@ import org.apache.hadoop.hdfs.server.datanode.FSDatasetInterface.FSVolumeInterfa
  * BlockVolumeChoosingPolicy allows a DataNode to
  * specify what policy is to be used while choosing
  * a volume for a block request.
- * 
+ *
+ * Note: This is an evolving i/f and is only for
+ * advanced use.
+ *
  ***************************************************/
-@InterfaceAudience.Public
-@InterfaceStability.Evolving
+@InterfaceAudience.Private
 public interface BlockVolumeChoosingPolicy {
 
   /**