diff --git a/hadoop-hdfs-project/hadoop-hdfs-nfs/src/test/java/org/apache/hadoop/hdfs/nfs/nfs3/TestWrites.java b/hadoop-hdfs-project/hadoop-hdfs-nfs/src/test/java/org/apache/hadoop/hdfs/nfs/nfs3/TestWrites.java
index 32f9b2bcddf..363bc1205e4 100644
--- a/hadoop-hdfs-project/hadoop-hdfs-nfs/src/test/java/org/apache/hadoop/hdfs/nfs/nfs3/TestWrites.java
+++ b/hadoop-hdfs-project/hadoop-hdfs-nfs/src/test/java/org/apache/hadoop/hdfs/nfs/nfs3/TestWrites.java
@@ -30,6 +30,7 @@ import java.util.concurrent.ConcurrentNavigableMap;
 import org.apache.hadoop.hdfs.DFSClient;
 import org.apache.hadoop.hdfs.MiniDFSCluster;
 import org.apache.hadoop.hdfs.client.HdfsDataOutputStream;
+import org.apache.hadoop.hdfs.nfs.conf.NfsConfigKeys;
 import org.apache.hadoop.hdfs.nfs.conf.NfsConfiguration;
 import org.apache.hadoop.hdfs.nfs.nfs3.OpenFileCtx.COMMIT_STATUS;
 import org.apache.hadoop.hdfs.nfs.nfs3.OpenFileCtx.CommitCtx;
@@ -407,4 +408,80 @@ public class TestWrites {
       }
     }
   }
+
+  @Test
+  public void testOOOWrites() throws IOException, InterruptedException {
+    NfsConfiguration config = new NfsConfiguration();
+    MiniDFSCluster cluster = null;
+    RpcProgramNfs3 nfsd;
+    final int bufSize = 32;
+    final int numOOO = 3;
+    SecurityHandler securityHandler = Mockito.mock(SecurityHandler.class);
+    Mockito.when(securityHandler.getUser()).thenReturn(
+        System.getProperty("user.name"));
+    String currentUser = System.getProperty("user.name");
+    config.set(
+        DefaultImpersonationProvider.getTestProvider().
+            getProxySuperuserGroupConfKey(currentUser),
+        "*");
+    config.set(
+        DefaultImpersonationProvider.getTestProvider().
+            getProxySuperuserIpConfKey(currentUser),
+        "*");
+    ProxyUsers.refreshSuperUserGroupsConfiguration(config);
+    // Use emphral port in case tests are running in parallel
+    config.setInt("nfs3.mountd.port", 0);
+    config.setInt("nfs3.server.port", 0);
+
+    try {
+      cluster = new MiniDFSCluster.Builder(config).numDataNodes(1).build();
+      cluster.waitActive();
+
+      Nfs3 nfs3 = new Nfs3(config);
+      nfs3.startServiceInternal(false);
+      nfsd = (RpcProgramNfs3) nfs3.getRpcProgram();
+
+      DFSClient dfsClient = new DFSClient(NameNode.getAddress(config), config);
+      HdfsFileStatus status = dfsClient.getFileInfo("/");
+      FileHandle rootHandle = new FileHandle(status.getFileId());
+
+      CREATE3Request createReq = new CREATE3Request(rootHandle,
+          "out-of-order-write" + System.currentTimeMillis(),
+          Nfs3Constant.CREATE_UNCHECKED, new SetAttr3(), 0);
+      XDR createXdr = new XDR();
+      createReq.serialize(createXdr);
+      CREATE3Response createRsp = nfsd.create(createXdr.asReadOnlyWrap(),
+          securityHandler, new InetSocketAddress("localhost", 1234));
+      FileHandle handle = createRsp.getObjHandle();
+
+      byte[][] oooBuf = new byte[numOOO][bufSize];
+      for (int i = 0; i < numOOO; i++) {
+        Arrays.fill(oooBuf[i], (byte) i);
+      }
+
+      for (int i = 0; i < numOOO; i++) {
+        final long offset = (numOOO - 1 - i) * bufSize;
+        WRITE3Request writeReq = new WRITE3Request(handle, offset, bufSize,
+            WriteStableHow.UNSTABLE, ByteBuffer.wrap(oooBuf[i]));
+        XDR writeXdr = new XDR();
+        writeReq.serialize(writeXdr);
+        nfsd.write(writeXdr.asReadOnlyWrap(), null, 1, securityHandler,
+            new InetSocketAddress("localhost", 1234));
+      }
+
+      waitWrite(nfsd, handle, 60000);
+      READ3Request readReq = new READ3Request(handle, bufSize, bufSize);
+      XDR readXdr = new XDR();
+      readReq.serialize(readXdr);
+      READ3Response readRsp = nfsd.read(readXdr.asReadOnlyWrap(),
+          securityHandler, new InetSocketAddress("localhost", config.getInt(
+              NfsConfigKeys.DFS_NFS_SERVER_PORT_KEY,
+              NfsConfigKeys.DFS_NFS_SERVER_PORT_DEFAULT)));
+      assertTrue(Arrays.equals(oooBuf[1], readRsp.getData().array()));
+    } finally {
+      if (cluster != null) {
+        cluster.shutdown();
+      }
+    }
+  }
 }
diff --git a/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt b/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
index 80b03e3f1f3..dad4a708e6c 100644
--- a/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
+++ b/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
@@ -144,6 +144,9 @@ Release 2.6.0 - UNRELEASED
     HDFS-6849. Replace HttpFS custom proxyuser handling with common 
     implementation. (tucu)
 
+    HDFS-6850. Move NFS out of order write unit tests into TestWrites class.
+    (Zhe Zhang via atm)
+
   OPTIMIZATIONS
 
     HDFS-6690. Deduplicate xattr names in memory. (wang)