diff --git a/hadoop-mapreduce-project/CHANGES.txt b/hadoop-mapreduce-project/CHANGES.txt
index 45075459667..a09d25e10b1 100644
--- a/hadoop-mapreduce-project/CHANGES.txt
+++ b/hadoop-mapreduce-project/CHANGES.txt
@@ -328,7 +328,6 @@ Release 2.8.0 - UNRELEASED
   OPTIMIZATIONS
 
   BUG FIXES
-
     MAPREDUCE-6314. TestPipeApplication fails on trunk.
     (Varun Vasudev via harsh)
 
@@ -400,6 +399,9 @@ Release 2.8.0 - UNRELEASED
     MAPREDUCE-3383. Duplicate job.getOutputValueGroupingComparator() in
     ReduceTask (Binglin Chang via jlowe)
 
+    MAPREDUCE-4750. Enable NNBenchWithoutMR in MapredTestDriver (Liang Xie
+    and Jason Lowe via raviprak)
+
 Release 2.7.1 - UNRELEASED
 
   INCOMPATIBLE CHANGES
diff --git a/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-jobclient/src/test/java/org/apache/hadoop/test/MapredTestDriver.java b/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-jobclient/src/test/java/org/apache/hadoop/test/MapredTestDriver.java
index b1dfe56dbf8..8fa82aabf17 100644
--- a/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-jobclient/src/test/java/org/apache/hadoop/test/MapredTestDriver.java
+++ b/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-jobclient/src/test/java/org/apache/hadoop/test/MapredTestDriver.java
@@ -35,6 +35,7 @@ import org.apache.hadoop.mapreduce.SleepJob;
 import org.apache.hadoop.util.ProgramDriver;
 
 import org.apache.hadoop.hdfs.NNBench;
+import org.apache.hadoop.hdfs.NNBenchWithoutMR;
 import org.apache.hadoop.fs.TestFileSystem;
 import org.apache.hadoop.fs.TestDFSIO;
 import org.apache.hadoop.fs.DFSCIOTest;
@@ -90,7 +91,9 @@ public class MapredTestDriver {
       pgd.addClass("sleep", SleepJob.class, 
                    "A job that sleeps at each map and reduce task.");
       pgd.addClass("nnbench", NNBench.class, 
-          "A benchmark that stresses the namenode.");
+          "A benchmark that stresses the namenode w/ MR.");
+      pgd.addClass("nnbenchWithoutMR", NNBenchWithoutMR.class,
+          "A benchmark that stresses the namenode w/o MR.");
       pgd.addClass("testfilesystem", TestFileSystem.class, 
           "A test for FileSystem read/write.");
       pgd.addClass(TestDFSIO.class.getSimpleName(), TestDFSIO.class,