diff --git a/hadoop-common-project/hadoop-common/CHANGES.txt b/hadoop-common-project/hadoop-common/CHANGES.txt
index 03d1761ccca..f6a49e43a5d 100644
--- a/hadoop-common-project/hadoop-common/CHANGES.txt
+++ b/hadoop-common-project/hadoop-common/CHANGES.txt
@@ -33,6 +33,9 @@ Release 2.4.0 - UNRELEASED
     HADOOP-10330. TestFrameDecoder fails if it cannot bind port 12345.
     (Arpit Agarwal)
 
+    HADOOP-10326. M/R jobs can not access S3 if Kerberos is enabled. (bc Wong
+    via atm)
+
 Release 2.3.0 - UNRELEASED
 
   INCOMPATIBLE CHANGES
diff --git a/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/s3/S3FileSystem.java b/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/s3/S3FileSystem.java
index 81ef31446e5..44fd0fa8d71 100644
--- a/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/s3/S3FileSystem.java
+++ b/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/s3/S3FileSystem.java
@@ -350,6 +350,12 @@ public class S3FileSystem extends FileSystem {
     return getConf().getLong("fs.s3.block.size", 64 * 1024 * 1024);
   }
 
+  @Override
+  public String getCanonicalServiceName() {
+    // Does not support Token
+    return null;
+  }
+
   // diagnostic methods
 
   void dump() throws IOException {
diff --git a/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/s3native/NativeS3FileSystem.java b/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/s3native/NativeS3FileSystem.java
index 2ea31d85a65..0782feb9088 100644
--- a/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/s3native/NativeS3FileSystem.java
+++ b/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/s3native/NativeS3FileSystem.java
@@ -699,4 +699,10 @@ public class NativeS3FileSystem extends FileSystem {
   public Path getWorkingDirectory() {
     return workingDir;
   }
+
+  @Override
+  public String getCanonicalServiceName() {
+    // Does not support Token
+    return null;
+  }
 }
diff --git a/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/fs/s3/S3FileSystemContractBaseTest.java b/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/fs/s3/S3FileSystemContractBaseTest.java
index d1770d3b889..d704b006bef 100644
--- a/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/fs/s3/S3FileSystemContractBaseTest.java
+++ b/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/fs/s3/S3FileSystemContractBaseTest.java
@@ -54,5 +54,10 @@ public abstract class S3FileSystemContractBaseTest
     assertEquals("Double default block size", newBlockSize,
 	fs.getFileStatus(file).getBlockSize());
   }
-  
+
+  public void testCanonicalName() throws Exception {
+    assertNull("s3 doesn't support security token and shouldn't have canonical name",
+               fs.getCanonicalServiceName());
+  }
+
 }
diff --git a/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/fs/s3native/NativeS3FileSystemContractBaseTest.java b/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/fs/s3native/NativeS3FileSystemContractBaseTest.java
index 60010e43644..ac6b9ec3251 100644
--- a/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/fs/s3native/NativeS3FileSystemContractBaseTest.java
+++ b/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/fs/s3native/NativeS3FileSystemContractBaseTest.java
@@ -48,7 +48,12 @@ public abstract class NativeS3FileSystemContractBaseTest
     store.purge("test");
     super.tearDown();
   }
-  
+
+  public void testCanonicalName() throws Exception {
+    assertNull("s3n doesn't support security token and shouldn't have canonical name",
+               fs.getCanonicalServiceName());
+  }
+
   public void testListStatusForRoot() throws Exception {
     FileStatus[] paths = fs.listStatus(path("/"));
     assertEquals(0, paths.length);
@@ -60,7 +65,7 @@ public abstract class NativeS3FileSystemContractBaseTest
     assertEquals(1, paths.length);
     assertEquals(path("/test"), paths[0].getPath());
   }
-  
+
   public void testNoTrailingBackslashOnBucket() throws Exception {
     assertTrue(fs.getFileStatus(new Path(fs.getUri().toString())).isDirectory());
   }