diff --git a/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/BBPartHandle.java b/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/BBPartHandle.java
index e1336b8085..9df45a9a39 100644
--- a/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/BBPartHandle.java
+++ b/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/BBPartHandle.java
@@ -19,9 +19,14 @@
 import java.nio.ByteBuffer;
 import java.util.Arrays;
 
+import org.apache.hadoop.classification.InterfaceAudience;
+import org.apache.hadoop.classification.InterfaceStability;
+
 /**
  * Byte array backed part handle.
  */
+@InterfaceAudience.Private
+@InterfaceStability.Unstable
 public final class BBPartHandle implements PartHandle {
 
   private static final long serialVersionUID = 0x23ce3eb1;
diff --git a/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/BBUploadHandle.java b/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/BBUploadHandle.java
index 6430c145e2..0d35bce6a2 100644
--- a/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/BBUploadHandle.java
+++ b/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/BBUploadHandle.java
@@ -19,9 +19,14 @@
 import java.nio.ByteBuffer;
 import java.util.Arrays;
 
+import org.apache.hadoop.classification.InterfaceAudience;
+import org.apache.hadoop.classification.InterfaceStability;
+
 /**
  * Byte array backed upload handle.
  */
+@InterfaceAudience.Private
+@InterfaceStability.Unstable
 public final class BBUploadHandle implements UploadHandle {
 
   private static final long serialVersionUID = 0x69d5509b;
diff --git a/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/FileSystemMultipartUploader.java b/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/FileSystemMultipartUploader.java
index f13b50bd20..690194d593 100644
--- a/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/FileSystemMultipartUploader.java
+++ b/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/FileSystemMultipartUploader.java
@@ -28,6 +28,8 @@
 
 import org.apache.commons.compress.utils.IOUtils;
 import org.apache.commons.lang3.tuple.Pair;
+import org.apache.hadoop.classification.InterfaceAudience;
+import org.apache.hadoop.classification.InterfaceStability;
 import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.fs.permission.FsPermission;
 
@@ -44,6 +46,8 @@
  *   and then delete the temp directory.</li>
  * </ul>
  */
+@InterfaceAudience.Private
+@InterfaceStability.Unstable
 public class FileSystemMultipartUploader extends MultipartUploader {
 
   private final FileSystem fs;
diff --git a/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/MultipartUploader.java b/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/MultipartUploader.java
index 76f58d3597..b56dbf880f 100644
--- a/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/MultipartUploader.java
+++ b/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/MultipartUploader.java
@@ -27,6 +27,9 @@
 
 import org.apache.commons.lang3.tuple.Pair;
 
+import org.apache.hadoop.classification.InterfaceAudience;
+import org.apache.hadoop.classification.InterfaceStability;
+
 /**
  * MultipartUploader is an interface for copying files multipart and across
  * multiple nodes. Users should:
@@ -41,6 +44,8 @@
  * that 'complete' will reorder parts if the destination FS doesn't already
  * do it for them.
  */
+@InterfaceAudience.Private
+@InterfaceStability.Unstable
 public abstract class MultipartUploader {
   public static final Logger LOG =
       LoggerFactory.getLogger(MultipartUploader.class);
diff --git a/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/MultipartUploaderFactory.java b/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/MultipartUploaderFactory.java
index b0fa798ee2..8b3523272f 100644
--- a/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/MultipartUploaderFactory.java
+++ b/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/MultipartUploaderFactory.java
@@ -16,6 +16,8 @@
  */
 package org.apache.hadoop.fs;
 
+import org.apache.hadoop.classification.InterfaceAudience;
+import org.apache.hadoop.classification.InterfaceStability;
 import org.apache.hadoop.conf.Configuration;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
@@ -28,6 +30,8 @@
  * {@link ServiceLoader}-driven uploader API for storage services supporting
  * multipart uploads.
  */
+@InterfaceAudience.Private
+@InterfaceStability.Unstable
 public abstract class MultipartUploaderFactory {
   public static final Logger LOG =
       LoggerFactory.getLogger(MultipartUploaderFactory.class);
diff --git a/hadoop-tools/hadoop-aws/src/main/java/org/apache/hadoop/fs/s3a/S3AMultipartUploader.java b/hadoop-tools/hadoop-aws/src/main/java/org/apache/hadoop/fs/s3a/S3AMultipartUploader.java
index 4a6cb8c093..cab4e2a029 100644
--- a/hadoop-tools/hadoop-aws/src/main/java/org/apache/hadoop/fs/s3a/S3AMultipartUploader.java
+++ b/hadoop-tools/hadoop-aws/src/main/java/org/apache/hadoop/fs/s3a/S3AMultipartUploader.java
@@ -38,6 +38,8 @@
 
 import org.apache.commons.lang3.StringUtils;
 import org.apache.commons.lang3.tuple.Pair;
+import org.apache.hadoop.classification.InterfaceAudience;
+import org.apache.hadoop.classification.InterfaceStability;
 import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.fs.BBPartHandle;
 import org.apache.hadoop.fs.BBUploadHandle;
@@ -55,6 +57,8 @@
  * MultipartUploader for S3AFileSystem. This uses the S3 multipart
  * upload mechanism.
  */
+@InterfaceAudience.Private
+@InterfaceStability.Unstable
 public class S3AMultipartUploader extends MultipartUploader {
 
   private final S3AFileSystem s3a;