diff --git a/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt b/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
index b5c5e6b0a8..179fe7e08f 100644
--- a/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
+++ b/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
@@ -494,6 +494,9 @@ Release 2.8.0 - UNRELEASED
     HDFS-8292. Move conditional in fmt_time from dfs-dust.js to status.html.
     (Charles Lamb via wang)
 
+    HDFS-8086. Move LeaseRenewer to the hdfs.client.impl package.  (Takanobu
+    Asanuma via szetszwo)
+
   OPTIMIZATIONS
 
     HDFS-8026. Trace FSOutputSummer#writeChecksumChunks rather than
diff --git a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/DFSClient.java b/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/DFSClient.java
index d47992b1a5..aaba543e63 100644
--- a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/DFSClient.java
+++ b/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/DFSClient.java
@@ -101,6 +101,7 @@
 import org.apache.hadoop.hdfs.client.HdfsDataInputStream;
 import org.apache.hadoop.hdfs.client.HdfsDataOutputStream;
 import org.apache.hadoop.hdfs.client.impl.DfsClientConf;
+import org.apache.hadoop.hdfs.client.impl.LeaseRenewer;
 import org.apache.hadoop.hdfs.net.Peer;
 import org.apache.hadoop.hdfs.net.TcpPeerServer;
 import org.apache.hadoop.hdfs.protocol.AclException;
@@ -481,7 +482,7 @@ void endFileLease(final long inodeId) throws IOException {
    *  enforced to consistently update its local dfsclients array and 
    *  client's filesBeingWritten map.
    */
-  void putFileBeingWritten(final long inodeId, final DFSOutputStream out) {
+  public void putFileBeingWritten(final long inodeId, final DFSOutputStream out) {
     synchronized(filesBeingWritten) {
       filesBeingWritten.put(inodeId, out);
       // update the last lease renewal time only when there was no
@@ -494,7 +495,7 @@ void putFileBeingWritten(final long inodeId, final DFSOutputStream out) {
   }
 
   /** Remove a file. Only called from LeaseRenewer. */
-  void removeFileBeingWritten(final long inodeId) {
+  public void removeFileBeingWritten(final long inodeId) {
     synchronized(filesBeingWritten) {
       filesBeingWritten.remove(inodeId);
       if (filesBeingWritten.isEmpty()) {
@@ -504,14 +505,14 @@ void removeFileBeingWritten(final long inodeId) {
   }
 
   /** Is file-being-written map empty? */
-  boolean isFilesBeingWrittenEmpty() {
+  public boolean isFilesBeingWrittenEmpty() {
     synchronized(filesBeingWritten) {
       return filesBeingWritten.isEmpty();
     }
   }
   
   /** @return true if the client is running */
-  boolean isClientRunning() {
+  public boolean isClientRunning() {
     return clientRunning;
   }
 
@@ -533,7 +534,7 @@ void updateLastLeaseRenewal() {
    * @return true if lease was renewed. May return false if this
    * client has been closed or has no files open.
    **/
-  boolean renewLease() throws IOException {
+  public boolean renewLease() throws IOException {
     if (clientRunning && !isFilesBeingWrittenEmpty()) {
       try {
         namenode.renewLease(clientName);
@@ -565,7 +566,7 @@ void closeConnectionToNamenode() {
   }
   
   /** Abort and release resources held.  Ignore all errors. */
-  void abort() {
+  public void abort() {
     clientRunning = false;
     closeAllFilesBeingWritten(true);
     try {
diff --git a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/LeaseRenewer.java b/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/client/impl/LeaseRenewer.java
similarity index 94%
rename from hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/LeaseRenewer.java
rename to hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/client/impl/LeaseRenewer.java
index 511bddb4c9..4cdf1685d6 100644
--- a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/LeaseRenewer.java
+++ b/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/client/impl/LeaseRenewer.java
@@ -15,7 +15,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package org.apache.hadoop.hdfs;
+package org.apache.hadoop.hdfs.client.impl;
 
 import java.io.IOException;
 import java.net.SocketTimeoutException;
@@ -31,6 +31,8 @@
 import org.apache.commons.logging.LogFactory;
 import org.apache.hadoop.HadoopIllegalArgumentException;
 import org.apache.hadoop.classification.InterfaceAudience;
+import org.apache.hadoop.hdfs.DFSClient;
+import org.apache.hadoop.hdfs.DFSOutputStream;
 import org.apache.hadoop.hdfs.protocol.HdfsConstants;
 import org.apache.hadoop.security.UserGroupInformation;
 import org.apache.hadoop.util.Daemon;
@@ -40,7 +42,7 @@
 
 /**
  * <p>
- * Used by {@link DFSClient} for renewing file-being-written leases
+ * Used by {@link org.apache.hadoop.hdfs.DFSClient} for renewing file-being-written leases
  * on the namenode.
  * When a file is opened for write (create or append),
  * namenode stores a file lease for recording the identity of the writer.
@@ -53,12 +55,12 @@
  * This class also provides the following functionality:
  * <ul>
  * <li>
- * It maintains a map from (namenode, user) pairs to lease renewers. 
+ * It maintains a map from (namenode, user) pairs to lease renewers.
  * The same {@link LeaseRenewer} instance is used for renewing lease
- * for all the {@link DFSClient} to the same namenode and the same user.
+ * for all the {@link org.apache.hadoop.hdfs.DFSClient} to the same namenode and the same user.
  * </li>
  * <li>
- * Each renewer maintains a list of {@link DFSClient}.
+ * Each renewer maintains a list of {@link org.apache.hadoop.hdfs.DFSClient}.
  * Periodically the leases for all the clients are renewed.
  * A client is removed from the list when the client is closed.
  * </li>
@@ -70,21 +72,21 @@
  * </p>
  */
 @InterfaceAudience.Private
-class LeaseRenewer {
+public class LeaseRenewer {
   static final Log LOG = LogFactory.getLog(LeaseRenewer.class);
 
   static final long LEASE_RENEWER_GRACE_DEFAULT = 60*1000L;
   static final long LEASE_RENEWER_SLEEP_DEFAULT = 1000L;
 
   /** Get a {@link LeaseRenewer} instance */
-  static LeaseRenewer getInstance(final String authority,
+  public static LeaseRenewer getInstance(final String authority,
       final UserGroupInformation ugi, final DFSClient dfsc) throws IOException {
     final LeaseRenewer r = Factory.INSTANCE.get(authority, ugi);
     r.addClient(dfsc);
     return r;
   }
 
-  /** 
+  /**
    * A factory for sharing {@link LeaseRenewer} objects
    * among {@link DFSClient} instances
    * so that there is only one renewer per authority per user.
@@ -124,7 +126,7 @@ public boolean equals(Object obj) {
           return this.authority.equals(that.authority)
                  && this.ugi.equals(that.ugi);
         }
-        return false;        
+        return false;
       }
 
       @Override
@@ -170,17 +172,17 @@ private synchronized void remove(final LeaseRenewer r) {
   /** Only the daemon with currentId should run. */
   private int currentId = 0;
 
-  /** 
+  /**
    * A period in milliseconds that the lease renewer thread should run
    * after the map became empty.
    * In other words,
    * if the map is empty for a time period longer than the grace period,
-   * the renewer should terminate.  
+   * the renewer should terminate.
    */
   private long gracePeriod;
   /**
    * The time period in milliseconds
-   * that the renewer sleeps for each iteration. 
+   * that the renewer sleeps for each iteration.
    */
   private long sleepPeriod;
 
@@ -199,7 +201,7 @@ private synchronized void remove(final LeaseRenewer r) {
   private LeaseRenewer(Factory.Key factorykey) {
     this.factorykey = factorykey;
     unsyncSetGraceSleepPeriod(LEASE_RENEWER_GRACE_DEFAULT);
-    
+
     if (LOG.isTraceEnabled()) {
       instantiationTrace = StringUtils.stringifyException(
         new Throwable("TRACE"));
@@ -244,7 +246,7 @@ private synchronized boolean clientsRunning() {
   }
 
   private synchronized long getSleepPeriod() {
-    return sleepPeriod;    
+    return sleepPeriod;
   }
 
   /** Set the grace period and adjust the sleep period accordingly. */
@@ -272,19 +274,19 @@ synchronized boolean isRunning() {
   public boolean isEmpty() {
     return dfsclients.isEmpty();
   }
-  
+
   /** Used only by tests */
   synchronized String getDaemonName() {
     return daemon.getName();
   }
 
-  /** Is the empty period longer than the grace period? */  
+  /** Is the empty period longer than the grace period? */
   private synchronized boolean isRenewerExpired() {
     return emptyTime != Long.MAX_VALUE
         && Time.monotonicNow() - emptyTime > gracePeriod;
   }
 
-  synchronized void put(final long inodeId, final DFSOutputStream out,
+  public synchronized void put(final long inodeId, final DFSOutputStream out,
       final DFSClient dfsc) {
     if (dfsc.isClientRunning()) {
       if (!isRunning() || isRenewerExpired()) {
@@ -314,7 +316,7 @@ public void run() {
               }
             }
           }
-          
+
           @Override
           public String toString() {
             return String.valueOf(LeaseRenewer.this);
@@ -333,7 +335,7 @@ synchronized void setEmptyTime(long time) {
   }
 
   /** Close a file. */
-  void closeFile(final long inodeId, final DFSClient dfsc) {
+  public void closeFile(final long inodeId, final DFSClient dfsc) {
     dfsc.removeFileBeingWritten(inodeId);
 
     synchronized(this) {
@@ -355,7 +357,7 @@ void closeFile(final long inodeId, final DFSClient dfsc) {
   }
 
   /** Close the given client. */
-  synchronized void closeClient(final DFSClient dfsc) {
+  public synchronized void closeClient(final DFSClient dfsc) {
     dfsclients.remove(dfsc);
     if (dfsclients.isEmpty()) {
       if (!isRunning() || isRenewerExpired()) {
@@ -381,7 +383,7 @@ synchronized void closeClient(final DFSClient dfsc) {
     }
   }
 
-  void interruptAndJoin() throws InterruptedException {
+  public void interruptAndJoin() throws InterruptedException {
     Daemon daemonCopy = null;
     synchronized (this) {
       if (isRunning()) {
@@ -389,7 +391,7 @@ void interruptAndJoin() throws InterruptedException {
         daemonCopy = daemon;
       }
     }
-   
+
     if (daemonCopy != null) {
       if(LOG.isDebugEnabled()) {
         LOG.debug("Wait for lease checker to terminate");
diff --git a/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestDistributedFileSystem.java b/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestDistributedFileSystem.java
index 0689a5333c..837665e8b3 100644
--- a/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestDistributedFileSystem.java
+++ b/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestDistributedFileSystem.java
@@ -31,6 +31,7 @@
 import java.io.File;
 import java.io.FileNotFoundException;
 import java.io.IOException;
+import java.lang.reflect.Method;
 import java.net.InetSocketAddress;
 import java.net.ServerSocket;
 import java.net.SocketTimeoutException;
@@ -64,6 +65,7 @@
 import org.apache.hadoop.fs.VolumeId;
 import org.apache.hadoop.fs.permission.FsPermission;
 import org.apache.hadoop.hdfs.MiniDFSCluster.DataNodeProperties;
+import org.apache.hadoop.hdfs.client.impl.LeaseRenewer;
 import org.apache.hadoop.hdfs.net.Peer;
 import org.apache.hadoop.hdfs.server.datanode.DataNodeFaultInjector;
 import org.apache.hadoop.hdfs.server.namenode.ha.HATestUtil;
@@ -264,78 +266,84 @@ public void testDFSClient() throws Exception {
 
       {
         final DistributedFileSystem dfs = cluster.getFileSystem();
-        dfs.dfs.getLeaseRenewer().setGraceSleepPeriod(grace);
-        assertFalse(dfs.dfs.getLeaseRenewer().isRunning());
+        Method setMethod = dfs.dfs.getLeaseRenewer().getClass()
+            .getDeclaredMethod("setGraceSleepPeriod", long.class);
+        setMethod.setAccessible(true);
+        setMethod.invoke(dfs.dfs.getLeaseRenewer(), grace);
+        Method checkMethod = dfs.dfs.getLeaseRenewer().getClass()
+            .getDeclaredMethod("isRunning");
+        checkMethod.setAccessible(true);
+        assertFalse((boolean) checkMethod.invoke(dfs.dfs.getLeaseRenewer()));
   
         {
           //create a file
           final FSDataOutputStream out = dfs.create(filepaths[0]);
-          assertTrue(dfs.dfs.getLeaseRenewer().isRunning());
+          assertTrue((boolean)checkMethod.invoke(dfs.dfs.getLeaseRenewer()));
           //write something
           out.writeLong(millis);
-          assertTrue(dfs.dfs.getLeaseRenewer().isRunning());
+          assertTrue((boolean)checkMethod.invoke(dfs.dfs.getLeaseRenewer()));
           //close
           out.close();
           Thread.sleep(grace/4*3);
           //within grace period
-          assertTrue(dfs.dfs.getLeaseRenewer().isRunning());
+          assertTrue((boolean)checkMethod.invoke(dfs.dfs.getLeaseRenewer()));
           for(int i = 0; i < 3; i++) {
-            if (dfs.dfs.getLeaseRenewer().isRunning()) {
+            if ((boolean)checkMethod.invoke(dfs.dfs.getLeaseRenewer())) {
               Thread.sleep(grace/2);
             }
           }
           //passed grace period
-          assertFalse(dfs.dfs.getLeaseRenewer().isRunning());
+          assertFalse((boolean)checkMethod.invoke(dfs.dfs.getLeaseRenewer()));
         }
 
         {
           //create file1
           final FSDataOutputStream out1 = dfs.create(filepaths[1]);
-          assertTrue(dfs.dfs.getLeaseRenewer().isRunning());
+          assertTrue((boolean)checkMethod.invoke(dfs.dfs.getLeaseRenewer()));
           //create file2
           final FSDataOutputStream out2 = dfs.create(filepaths[2]);
-          assertTrue(dfs.dfs.getLeaseRenewer().isRunning());
+          assertTrue((boolean)checkMethod.invoke(dfs.dfs.getLeaseRenewer()));
 
           //write something to file1
           out1.writeLong(millis);
-          assertTrue(dfs.dfs.getLeaseRenewer().isRunning());
+          assertTrue((boolean)checkMethod.invoke(dfs.dfs.getLeaseRenewer()));
           //close file1
           out1.close();
-          assertTrue(dfs.dfs.getLeaseRenewer().isRunning());
+          assertTrue((boolean)checkMethod.invoke(dfs.dfs.getLeaseRenewer()));
 
           //write something to file2
           out2.writeLong(millis);
-          assertTrue(dfs.dfs.getLeaseRenewer().isRunning());
+          assertTrue((boolean)checkMethod.invoke(dfs.dfs.getLeaseRenewer()));
           //close file2
           out2.close();
           Thread.sleep(grace/4*3);
           //within grace period
-          assertTrue(dfs.dfs.getLeaseRenewer().isRunning());
+          assertTrue((boolean)checkMethod.invoke(dfs.dfs.getLeaseRenewer()));
         }
 
         {
           //create file3
           final FSDataOutputStream out3 = dfs.create(filepaths[3]);
-          assertTrue(dfs.dfs.getLeaseRenewer().isRunning());
+          assertTrue((boolean)checkMethod.invoke(dfs.dfs.getLeaseRenewer()));
           Thread.sleep(grace/4*3);
           //passed previous grace period, should still running
-          assertTrue(dfs.dfs.getLeaseRenewer().isRunning());
+          assertTrue((boolean)checkMethod.invoke(dfs.dfs.getLeaseRenewer()));
           //write something to file3
           out3.writeLong(millis);
-          assertTrue(dfs.dfs.getLeaseRenewer().isRunning());
+          assertTrue((boolean)checkMethod.invoke(dfs.dfs.getLeaseRenewer()));
           //close file3
           out3.close();
-          assertTrue(dfs.dfs.getLeaseRenewer().isRunning());
+          assertTrue((boolean)checkMethod.invoke(dfs.dfs.getLeaseRenewer()));
           Thread.sleep(grace/4*3);
           //within grace period
-          assertTrue(dfs.dfs.getLeaseRenewer().isRunning());
+          assertTrue((boolean)checkMethod.invoke(dfs.dfs.getLeaseRenewer()));
           for(int i = 0; i < 3; i++) {
-            if (dfs.dfs.getLeaseRenewer().isRunning()) {
+            if ((boolean)checkMethod.invoke(dfs.dfs.getLeaseRenewer())) {
               Thread.sleep(grace/2);
             }
           }
           //passed grace period
-          assertFalse(dfs.dfs.getLeaseRenewer().isRunning());
+          assertFalse((boolean)checkMethod.invoke(dfs.dfs.getLeaseRenewer()));
         }
 
         dfs.close();
@@ -364,15 +372,18 @@ public void testDFSClient() throws Exception {
 
       {
         final DistributedFileSystem dfs = cluster.getFileSystem();
-        assertFalse(dfs.dfs.getLeaseRenewer().isRunning());
+        Method checkMethod = dfs.dfs.getLeaseRenewer().getClass()
+            .getDeclaredMethod("isRunning");
+        checkMethod.setAccessible(true);
+        assertFalse((boolean)checkMethod.invoke(dfs.dfs.getLeaseRenewer()));
 
         //open and check the file
         FSDataInputStream in = dfs.open(filepaths[0]);
-        assertFalse(dfs.dfs.getLeaseRenewer().isRunning());
+        assertFalse((boolean)checkMethod.invoke(dfs.dfs.getLeaseRenewer()));
         assertEquals(millis, in.readLong());
-        assertFalse(dfs.dfs.getLeaseRenewer().isRunning());
+        assertFalse((boolean)checkMethod.invoke(dfs.dfs.getLeaseRenewer()));
         in.close();
-        assertFalse(dfs.dfs.getLeaseRenewer().isRunning());
+        assertFalse((boolean)checkMethod.invoke(dfs.dfs.getLeaseRenewer()));
         dfs.close();
       }
       
diff --git a/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestLease.java b/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestLease.java
index 1cf7add170..9b5a7c03a3 100644
--- a/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestLease.java
+++ b/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestLease.java
@@ -45,6 +45,7 @@
 import org.apache.hadoop.fs.Options;
 import org.apache.hadoop.fs.Path;
 import org.apache.hadoop.fs.permission.FsPermission;
+import org.apache.hadoop.hdfs.client.impl.LeaseRenewer;
 import org.apache.hadoop.hdfs.protocol.ClientProtocol;
 import org.apache.hadoop.hdfs.protocol.HdfsConstants;
 import org.apache.hadoop.hdfs.protocol.HdfsFileStatus;
diff --git a/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestLeaseRenewer.java b/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/client/impl/TestLeaseRenewer.java
similarity index 97%
rename from hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestLeaseRenewer.java
rename to hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/client/impl/TestLeaseRenewer.java
index f091db7430..a4e00d9412 100644
--- a/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestLeaseRenewer.java
+++ b/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/client/impl/TestLeaseRenewer.java
@@ -15,13 +15,15 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package org.apache.hadoop.hdfs;
+package org.apache.hadoop.hdfs.client.impl;
 
 import static org.junit.Assert.assertSame;
 
 import java.io.IOException;
 import java.util.concurrent.atomic.AtomicInteger;
 
+import org.apache.hadoop.hdfs.DFSClient;
+import org.apache.hadoop.hdfs.DFSOutputStream;
 import org.apache.hadoop.hdfs.client.impl.DfsClientConf;
 import org.apache.hadoop.security.UserGroupInformation;
 import org.apache.hadoop.test.GenericTestUtils;
@@ -46,19 +48,19 @@ public class TestLeaseRenewer {
 
   private DFSClient MOCK_DFSCLIENT;
   private LeaseRenewer renewer;
-  
+
   /** Cause renewals often so test runs quickly. */
   private static final long FAST_GRACE_PERIOD = 100L;
-  
+
   @Before
   public void setupMocksAndRenewer() throws IOException {
     MOCK_DFSCLIENT = createMockClient();
-    
+
     renewer = LeaseRenewer.getInstance(
         FAKE_AUTHORITY, FAKE_UGI_A, MOCK_DFSCLIENT);
     renewer.setGraceSleepPeriod(FAST_GRACE_PERIOD);
 }
- 
+
   private DFSClient createMockClient() {
     final DfsClientConf mockConf = Mockito.mock(DfsClientConf.class);
     Mockito.doReturn((int)FAST_GRACE_PERIOD).when(mockConf).getHdfsTimeout();
@@ -79,12 +81,12 @@ public void testInstanceSharing() throws IOException {
     LeaseRenewer lr2 = LeaseRenewer.getInstance(
         FAKE_AUTHORITY, FAKE_UGI_A, MOCK_DFSCLIENT);
     Assert.assertSame(lr, lr2);
-    
+
     // But a different UGI should return a different instance
     LeaseRenewer lr3 = LeaseRenewer.getInstance(
         FAKE_AUTHORITY, FAKE_UGI_B, MOCK_DFSCLIENT);
     Assert.assertNotSame(lr, lr3);
-    
+
     // A different authority with same UGI should also be a different
     // instance.
     LeaseRenewer lr4 = LeaseRenewer.getInstance(
@@ -92,7 +94,7 @@ public void testInstanceSharing() throws IOException {
     Assert.assertNotSame(lr, lr4);
     Assert.assertNotSame(lr3, lr4);
   }
-  
+
   @Test
   public void testRenewal() throws Exception {
     // Keep track of how many times the lease gets renewed
@@ -105,7 +107,7 @@ public Boolean answer(InvocationOnMock invocation) throws Throwable {
       }
     }).when(MOCK_DFSCLIENT).renewLease();
 
-    
+
     // Set up a file so that we start renewing our lease.
     DFSOutputStream mockStream = Mockito.mock(DFSOutputStream.class);
     long fileId = 123L;
@@ -123,7 +125,7 @@ public Boolean answer(InvocationOnMock invocation) throws Throwable {
 
     renewer.closeFile(fileId, MOCK_DFSCLIENT);
   }
-  
+
   /**
    * Regression test for HDFS-2810. In this bug, the LeaseRenewer has handles
    * to several DFSClients with the same name, the first of which has no files
@@ -136,7 +138,7 @@ public void testManyDfsClientsWhereSomeNotOpen() throws Exception {
     Mockito.doReturn(false).when(mockClient1).renewLease();
     assertSame(renewer, LeaseRenewer.getInstance(
         FAKE_AUTHORITY, FAKE_UGI_A, mockClient1));
-    
+
     // Set up a file so that we start renewing our lease.
     DFSOutputStream mockStream1 = Mockito.mock(DFSOutputStream.class);
     long fileId = 456L;
@@ -152,7 +154,7 @@ public void testManyDfsClientsWhereSomeNotOpen() throws Exception {
     DFSOutputStream mockStream2 = Mockito.mock(DFSOutputStream.class);
     renewer.put(fileId, mockStream2, mockClient2);
 
-    
+
     // Wait for lease to get renewed
     GenericTestUtils.waitFor(new Supplier<Boolean>() {
       @Override
@@ -174,28 +176,28 @@ public Boolean get() {
     renewer.closeFile(fileId, mockClient1);
     renewer.closeFile(fileId, mockClient2);
   }
-  
+
   @Test
   public void testThreadName() throws Exception {
     DFSOutputStream mockStream = Mockito.mock(DFSOutputStream.class);
     long fileId = 789L;
     Assert.assertFalse("Renewer not initially running",
         renewer.isRunning());
-    
+
     // Pretend to open a file
     renewer.put(fileId, mockStream, MOCK_DFSCLIENT);
-    
+
     Assert.assertTrue("Renewer should have started running",
         renewer.isRunning());
-    
+
     // Check the thread name is reasonable
     String threadName = renewer.getDaemonName();
     Assert.assertEquals("LeaseRenewer:myuser@hdfs://nn1/", threadName);
-    
+
     // Pretend to close the file
     renewer.closeFile(fileId, MOCK_DFSCLIENT);
     renewer.setEmptyTime(Time.monotonicNow());
-    
+
     // Should stop the renewer running within a few seconds
     long failTime = Time.monotonicNow() + 5000;
     while (renewer.isRunning() && Time.monotonicNow() < failTime) {
@@ -203,5 +205,5 @@ public void testThreadName() throws Exception {
     }
     Assert.assertFalse(renewer.isRunning());
   }
-  
+
 }