HDFS-2239. Reduce access levels of the fields and methods in FSNamesystem.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1155998 13f79535-47bb-0310-9956-ffa450edef68

hdfs/CHANGES.txt

@@ -654,6 +654,9 @@ Trunk (unreleased changes)
     FileJournalManager during checkpoint process (Ivan Kelly and Todd Lipcon
     via todd)
 
+    HDFS-2239. Reduce access levels of the fields and methods in FSNamesystem.
+    (szetszwo)
+
   OPTIMIZATIONS
 
     HDFS-1458. Improve checkpoint performance by avoiding unnecessary image

hdfs/src/java/org/apache/hadoop/hdfs/server/blockmanagement/BlockManager.java

@@ -380,19 +380,8 @@ public class BlockManager {
       "commitBlock length is less than the stored one "
       + commitBlock.getNumBytes() + " vs. " + block.getNumBytes();
     block.commitBlock(commitBlock);
-    
-    // Adjust disk space consumption if required
-    long diff = fileINode.getPreferredBlockSize() - commitBlock.getNumBytes();    
-    if (diff > 0) {
-      try {
-        String path = /* For finding parents */
-        namesystem.leaseManager.findPath(fileINode);
-        namesystem.dir.updateSpaceConsumed(path, 0, -diff
-            * fileINode.getReplication());
-      } catch (IOException e) {
-        LOG.warn("Unexpected exception while updating disk space.", e);
-      }
-    }
+
+    namesystem.updateDiskSpaceConsumed(fileINode, commitBlock);
   }
   
   /**
@@ -682,8 +671,26 @@ public class BlockManager {
                             minReplication);
   }
 
-   /** Get all blocks with location information from a datanode. */
-  public BlocksWithLocations getBlocksWithLocations(final DatanodeID datanode,
+  /**
+   * return a list of blocks & their locations on <code>datanode</code> whose
+   * total size is <code>size</code>
+   * 
+   * @param datanode on which blocks are located
+   * @param size total size of blocks
+   */
+  public BlocksWithLocations getBlocks(DatanodeID datanode, long size
+      ) throws IOException {
+    namesystem.readLock();
+    try {
+      namesystem.checkSuperuserPrivilege();
+      return getBlocksWithLocations(datanode, size);  
+    } finally {
+      namesystem.readUnlock();
+    }
+  }
+
+  /** Get all blocks with location information from a datanode. */
+  private BlocksWithLocations getBlocksWithLocations(final DatanodeID datanode,
       final long size) throws UnregisteredNodeException {
     final DatanodeDescriptor node = getDatanodeManager().getDatanode(datanode);
     if (node == null) {

hdfs/src/java/org/apache/hadoop/hdfs/server/blockmanagement/DatanodeManager.java

@@ -649,8 +649,24 @@ public class DatanodeManager {
     heartbeatManager.addDatanode(nodeDescr);
   }
 
+  /**
+   * Rereads conf to get hosts and exclude list file names.
+   * Rereads the files to update the hosts and exclude lists.  It
+   * checks if any of the hosts have changed states:
+   */
+  public void refreshNodes(final Configuration conf) throws IOException {
+    namesystem.checkSuperuserPrivilege();
+    refreshHostsReader(conf);
+    namesystem.writeLock();
+    try {
+      refreshDatanodes();
+    } finally {
+      namesystem.writeUnlock();
+    }
+  }
+
   /** Reread include/exclude files. */
-  public void refreshHostsReader(Configuration conf) throws IOException {
+  private void refreshHostsReader(Configuration conf) throws IOException {
     // Reread the conf to get dfs.hosts and dfs.hosts.exclude filenames.
     // Update the file names and refresh internal includes and excludes list.
     if (conf == null) {
@@ -662,15 +678,12 @@ public class DatanodeManager {
   }
   
   /**
-   * Rereads the config to get hosts and exclude list file names.
-   * Rereads the files to update the hosts and exclude lists.  It
-   * checks if any of the hosts have changed states:
    * 1. Added to hosts  --> no further work needed here.
    * 2. Removed from hosts --> mark AdminState as decommissioned. 
    * 3. Added to exclude --> start decommission.
    * 4. Removed from exclude --> stop decommission.
    */
-  public void refreshDatanodes() throws IOException {
+  private void refreshDatanodes() throws IOException {
     for(DatanodeDescriptor node : datanodeMap.values()) {
       // Check if not include.
       if (!inHostsList(node, null)) {

hdfs/src/java/org/apache/hadoop/hdfs/server/namenode/FSDirectory.java

@@ -1341,7 +1341,7 @@ public class FSDirectory implements Closeable {
    * @throws QuotaExceededException if the new count violates any quota limit
    * @throws FileNotFound if path does not exist.
    */
-  public void updateSpaceConsumed(String path, long nsDelta, long dsDelta)
+  void updateSpaceConsumed(String path, long nsDelta, long dsDelta)
                                          throws QuotaExceededException,
                                                 FileNotFoundException,
                                                 UnresolvedLinkException {

hdfs/src/java/org/apache/hadoop/hdfs/server/namenode/FSImage.java

@@ -137,10 +137,6 @@ public class FSImage implements Closeable {
                              FSImage.getCheckpointEditsDirs(conf, null));
 
     storage = new NNStorage(conf, imageDirs, editsDirs);
-    if (ns != null) {
-      storage.setUpgradeManager(ns.upgradeManager);
-    }
-
     if(conf.getBoolean(DFSConfigKeys.DFS_NAMENODE_NAME_DIR_RESTORE_KEY,
                        DFSConfigKeys.DFS_NAMENODE_NAME_DIR_RESTORE_DEFAULT)) {
       storage.setRestoreFailedStorage(true);

hdfs/src/java/org/apache/hadoop/hdfs/server/namenode/FSNamesystem.java

@@ -104,13 +104,13 @@ import org.apache.hadoop.hdfs.server.common.UpgradeStatusReport;
 import org.apache.hadoop.hdfs.server.common.Util;
 import org.apache.hadoop.hdfs.server.namenode.LeaseManager.Lease;
 import org.apache.hadoop.hdfs.server.namenode.metrics.FSNamesystemMBean;
-import org.apache.hadoop.hdfs.server.protocol.BlocksWithLocations;
 import org.apache.hadoop.hdfs.server.protocol.DatanodeCommand;
 import org.apache.hadoop.hdfs.server.protocol.DatanodeRegistration;
 import org.apache.hadoop.hdfs.server.protocol.NamenodeCommand;
 import org.apache.hadoop.hdfs.server.protocol.NamenodeRegistration;
 import org.apache.hadoop.hdfs.server.protocol.NamespaceInfo;
 import org.apache.hadoop.hdfs.server.protocol.UpgradeCommand;
+import org.apache.hadoop.hdfs.util.RwLock;
 import org.apache.hadoop.io.IOUtils;
 import org.apache.hadoop.io.Text;
 import org.apache.hadoop.ipc.Server;
@@ -146,8 +146,8 @@ import org.mortbay.util.ajax.JSON;
  ***************************************************/
 @InterfaceAudience.Private
 @Metrics(context="dfs")
-public class FSNamesystem implements FSConstants, FSNamesystemMBean,
-    FSClusterStats, NameNodeMXBean {
+public class FSNamesystem implements RwLock, FSConstants, FSClusterStats,
+    FSNamesystemMBean, NameNodeMXBean {
   static final Log LOG = LogFactory.getLog(FSNamesystem.class);
 
   private static final ThreadLocal<StringBuilder> auditBuffer =
@@ -211,20 +211,16 @@ public class FSNamesystem implements FSConstants, FSNamesystemMBean,
   //
   // Stores the correct file name hierarchy
   //
-  public FSDirectory dir;
+  FSDirectory dir;
   private BlockManager blockManager;
   private DatanodeStatistics datanodeStatistics;
 
   // Block pool ID used by this namenode
-  String blockPoolId;
+  private String blockPoolId;
 
-  public LeaseManager leaseManager = new LeaseManager(this); 
+  LeaseManager leaseManager = new LeaseManager(this); 
 
-  //
-  // Threaded object that checks to see if we have been
-  // getting heartbeats from all clients. 
-  //
-  public Daemon lmthread = null;   // LeaseMonitor thread
+  Daemon lmthread = null;   // LeaseMonitor thread
   Daemon smmthread = null;  // SafeModeMonitor thread
   
   Daemon nnrmthread = null; // NamenodeResourceMonitor thread
@@ -330,7 +326,7 @@ public class FSNamesystem implements FSConstants, FSNamesystemMBean,
     return getStorageDirs(conf, DFSConfigKeys.DFS_NAMENODE_NAME_DIR_KEY);
   }
 
-  public static Collection<URI> getStorageDirs(Configuration conf,
+  private static Collection<URI> getStorageDirs(Configuration conf,
                                                 String propertyName) {
     Collection<String> dirNames = conf.getTrimmedStringCollection(propertyName);
     StartupOption startOpt = NameNode.getStartupOption(conf);
@@ -364,31 +360,31 @@ public class FSNamesystem implements FSConstants, FSNamesystemMBean,
     return getStorageDirs(conf, DFSConfigKeys.DFS_NAMENODE_EDITS_DIR_KEY);
   }
 
-  // utility methods to acquire and release read lock and write lock
+  @Override
   public void readLock() {
     this.fsLock.readLock().lock();
   }
-
+  @Override
   public void readUnlock() {
     this.fsLock.readLock().unlock();
   }
-
+  @Override
   public void writeLock() {
     this.fsLock.writeLock().lock();
   }
-
+  @Override
   public void writeUnlock() {
     this.fsLock.writeLock().unlock();
   }
-
+  @Override
   public boolean hasWriteLock() {
     return this.fsLock.isWriteLockedByCurrentThread();
   }
-
-  boolean hasReadLock() {
+  @Override
+  public boolean hasReadLock() {
     return this.fsLock.getReadHoldCount() > 0;
   }
-
+  @Override
   public boolean hasReadOrWriteLock() {
     return hasReadLock() || hasWriteLock();
   }
@@ -473,7 +469,8 @@ public class FSNamesystem implements FSConstants, FSNamesystemMBean,
     try {
       return new NamespaceInfo(dir.fsImage.getStorage().getNamespaceID(),
           getClusterId(), getBlockPoolId(),
-          dir.fsImage.getStorage().getCTime(), getDistributedUpgradeVersion());
+          dir.fsImage.getStorage().getCTime(),
+          upgradeManager.getUpgradeVersion());
     } finally {
       readUnlock();
     }
@@ -484,7 +481,7 @@ public class FSNamesystem implements FSConstants, FSNamesystemMBean,
    * Causes heartbeat and lease daemons to stop; waits briefly for
    * them to finish, but a short timeout returns control back to caller.
    */
-  public void close() {
+  void close() {
     fsRunning = false;
     try {
       if (blockManager != null) blockManager.close();
@@ -562,30 +559,6 @@ public class FSNamesystem implements FSConstants, FSNamesystemMBean,
     return accessTimePrecision > 0;
   }
 
-  /////////////////////////////////////////////////////////
-  //
-  // These methods are called by secondary namenodes
-  //
-  /////////////////////////////////////////////////////////
-  /**
-   * return a list of blocks & their locations on <code>datanode</code> whose
-   * total size is <code>size</code>
-   * 
-   * @param datanode on which blocks are located
-   * @param size total size of blocks
-   */
-  BlocksWithLocations getBlocks(DatanodeID datanode, long size)
-      throws IOException {
-    readLock();
-    try {
-      checkSuperuserPrivilege();
-      return blockManager.getBlocksWithLocations(datanode, size);  
-    } finally {
-      readUnlock();
-    }
-  }
-
-
   /////////////////////////////////////////////////////////
   //
   // These methods are called by HadoopFS clients
@@ -765,7 +738,7 @@ public class FSNamesystem implements FSConstants, FSNamesystemMBean,
    * @param srcs
    * @throws IOException
    */
-  public void concat(String target, String [] srcs) 
+  void concat(String target, String [] srcs) 
       throws IOException, UnresolvedLinkException {
     if(FSNamesystem.LOG.isDebugEnabled()) {
       FSNamesystem.LOG.debug("concat " + Arrays.toString(srcs) +
@@ -813,7 +786,7 @@ public class FSNamesystem implements FSConstants, FSNamesystemMBean,
   }
 
   /** See {@link #concat(String, String[])} */
-  public void concatInternal(String target, String [] srcs) 
+  private void concatInternal(String target, String [] srcs) 
       throws IOException, UnresolvedLinkException {
     assert hasWriteLock();
 
@@ -1429,7 +1402,7 @@ public class FSNamesystem implements FSConstants, FSNamesystemMBean,
    * are replicated.  Will return an empty 2-elt array if we want the
    * client to "try again later".
    */
-  public LocatedBlock getAdditionalBlock(String src,
+  LocatedBlock getAdditionalBlock(String src,
                                          String clientName,
                                          ExtendedBlock previous,
                                          HashMap<Node, Node> excludedNodes
@@ -1632,7 +1605,7 @@ public class FSNamesystem implements FSConstants, FSNamesystemMBean,
    *         (e.g if not all blocks have reached minimum replication yet)
    * @throws IOException on error (eg lease mismatch, file not open, file deleted)
    */
-  public boolean completeFile(String src, String holder, ExtendedBlock last) 
+  boolean completeFile(String src, String holder, ExtendedBlock last) 
     throws SafeModeException, UnresolvedLinkException, IOException {
     checkBlock(last);
     boolean success = false;
@@ -2258,7 +2231,7 @@ public class FSNamesystem implements FSConstants, FSNamesystemMBean,
     return false;
   }
 
-  Lease reassignLease(Lease lease, String src, String newHolder,
+  private Lease reassignLease(Lease lease, String src, String newHolder,
       INodeFileUnderConstruction pendingFile) throws IOException {
     assert hasWriteLock();
     if(newHolder == null)
@@ -2274,6 +2247,22 @@ public class FSNamesystem implements FSConstants, FSNamesystemMBean,
     return leaseManager.reassignLease(lease, src, newHolder);
   }
 
+  /** Update disk space consumed. */
+  public void updateDiskSpaceConsumed(final INodeFileUnderConstruction fileINode,
+      final Block commitBlock) throws IOException {
+    assert hasWriteLock();
+
+    // Adjust disk space consumption if required
+    final long diff = fileINode.getPreferredBlockSize() - commitBlock.getNumBytes();    
+    if (diff > 0) {
+      try {
+        String path = leaseManager.findPath(fileINode);
+        dir.updateSpaceConsumed(path, 0, -diff * fileINode.getReplication());
+      } catch (IOException e) {
+        LOG.warn("Unexpected exception while updating disk space.", e);
+      }
+    }
+  }
 
   private void finalizeINodeFileUnderConstruction(String src, 
       INodeFileUnderConstruction pendingFile) 
@@ -2473,8 +2462,7 @@ public class FSNamesystem implements FSConstants, FSNamesystemMBean,
    * 
    * @see org.apache.hadoop.hdfs.server.datanode.DataNode
    */
-  public void registerDatanode(DatanodeRegistration nodeReg)
-      throws IOException {
+  void registerDatanode(DatanodeRegistration nodeReg) throws IOException {
     writeLock();
     try {
       getBlockManager().getDatanodeManager().registerDatanode(nodeReg);
@@ -2505,7 +2493,7 @@ public class FSNamesystem implements FSConstants, FSNamesystemMBean,
    * @return an array of datanode commands 
    * @throws IOException
    */
-  public DatanodeCommand[] handleHeartbeat(DatanodeRegistration nodeReg,
+  DatanodeCommand[] handleHeartbeat(DatanodeRegistration nodeReg,
       long capacity, long dfsUsed, long remaining, long blockPoolUsed,
       int xceiverCount, int xmitsInProgress, int failedVolumes) 
         throws IOException {
@@ -2521,7 +2509,7 @@ public class FSNamesystem implements FSConstants, FSNamesystemMBean,
       }
 
       //check distributed upgrade
-      DatanodeCommand cmd = getDistributedUpgradeCommand();
+      DatanodeCommand cmd = upgradeManager.getBroadcastCommand();
       if (cmd != null) {
         return new DatanodeCommand[] {cmd};
       }
@@ -2737,30 +2725,10 @@ public class FSNamesystem implements FSConstants, FSNamesystemMBean,
     }
   }
 
-  public Date getStartTime() {
+  Date getStartTime() {
     return new Date(systemStart); 
   }
     
-  /**
-   * Rereads the config to get hosts and exclude list file names.
-   * Rereads the files to update the hosts and exclude lists.  It
-   * checks if any of the hosts have changed states:
-   * 1. Added to hosts  --> no further work needed here.
-   * 2. Removed from hosts --> mark AdminState as decommissioned. 
-   * 3. Added to exclude --> start decommission.
-   * 4. Removed from exclude --> stop decommission.
-   */
-  public void refreshNodes(Configuration conf) throws IOException {
-    checkSuperuserPrivilege();
-    getBlockManager().getDatanodeManager().refreshHostsReader(conf);
-    writeLock();
-    try {
-      getBlockManager().getDatanodeManager().refreshDatanodes();
-    } finally {
-      writeUnlock();
-    }
-  }
-    
   void finalizeUpgrade() throws IOException {
     checkSuperuserPrivilege();
     getFSImage().finalizeUpgrade();
@@ -2908,7 +2876,7 @@ public class FSNamesystem implements FSConstants, FSNamesystemMBean,
         // verify whether a distributed upgrade needs to be started
         boolean needUpgrade = false;
         try {
-          needUpgrade = startDistributedUpgradeIfNeeded();
+          needUpgrade = upgradeManager.startUpgrade();
         } catch(IOException e) {
           FSNamesystem.LOG.error("IOException in startDistributedUpgradeIfNeeded", e);
         }
@@ -3101,10 +3069,10 @@ public class FSNamesystem implements FSConstants, FSNamesystemMBean,
         leaveMsg = "Safe mode will be turned off automatically";
       }
       if(isManual()) {
-        if(getDistributedUpgradeState())
+        if(upgradeManager.getUpgradeState())
           return leaveMsg + " upon completion of " + 
             "the distributed upgrade: upgrade progress = " + 
-            getDistributedUpgradeStatus() + "%";
+            upgradeManager.getUpgradeStatus() + "%";
         leaveMsg = "Use \"hdfs dfsadmin -safemode leave\" to turn safe mode off";
       }
 
@@ -3306,7 +3274,7 @@ public class FSNamesystem implements FSConstants, FSNamesystemMBean,
   /**
    * Set the total number of blocks in the system. 
    */
-  void setBlockTotal() {
+  private void setBlockTotal() {
     // safeMode is volatile, and may be set to null at any time
     SafeModeInfo safeMode = this.safeMode;
     if (safeMode == null)
@@ -3327,7 +3295,7 @@ public class FSNamesystem implements FSConstants, FSNamesystemMBean,
    * Get the total number of COMPLETE blocks in the system.
    * For safe mode only complete blocks are counted.
    */
-  long getCompleteBlocksTotal() {
+  private long getCompleteBlocksTotal() {
     // Calculate number of blocks under construction
     long numUCBlocks = 0;
     readLock();
@@ -3398,7 +3366,7 @@ public class FSNamesystem implements FSConstants, FSNamesystemMBean,
         NameNode.stateChangeLog.info("STATE* Safe mode is already OFF."); 
         return;
       }
-      if(getDistributedUpgradeState())
+      if(upgradeManager.getUpgradeState())
         throw new SafeModeException("Distributed upgrade is in progress",
                                     safeMode);
       safeMode.leave(checkForUpgrades);
@@ -3487,26 +3455,6 @@ public class FSNamesystem implements FSConstants, FSNamesystemMBean,
     return upgradeManager.processUpgradeCommand(comm);
   }
 
-  int getDistributedUpgradeVersion() {
-    return upgradeManager.getUpgradeVersion();
-  }
-
-  UpgradeCommand getDistributedUpgradeCommand() throws IOException {
-    return upgradeManager.getBroadcastCommand();
-  }
-
-  boolean getDistributedUpgradeState() {
-    return upgradeManager.getUpgradeState();
-  }
-
-  short getDistributedUpgradeStatus() {
-    return upgradeManager.getUpgradeStatus();
-  }
-
-  boolean startDistributedUpgradeIfNeeded() throws IOException {
-    return upgradeManager.startUpgrade();
-  }
-
   PermissionStatus createFsOwnerPermissions(FsPermission permission) {
     return new PermissionStatus(fsOwner.getShortUserName(), supergroup, permission);
   }
@@ -3536,7 +3484,8 @@ public class FSNamesystem implements FSConstants, FSNamesystemMBean,
     return checkPermission(path, false, null, null, null, null);
   }
 
-  private void checkSuperuserPrivilege() throws AccessControlException {
+  /** Check if the user has superuser privilege. */
+  public void checkSuperuserPrivilege() throws AccessControlException {
     if (isPermissionEnabled) {
       FSPermissionChecker.checkSuperuserPrivilege(fsOwner, supergroup);
     }
@@ -3644,7 +3593,7 @@ public class FSNamesystem implements FSConstants, FSNamesystemMBean,
    * Register the FSNamesystem MBean using the name
    *        "hadoop:service=NameNode,name=FSNamesystemState"
    */
-  void registerMBean() {
+  private void registerMBean() {
     // We can only implement one MXBean interface, so we keep the old one.
     try {
       StandardMBean bean = new StandardMBean(this, FSNamesystemMBean.class);
@@ -3805,7 +3754,7 @@ public class FSNamesystem implements FSConstants, FSNamesystemMBean,
   }
 
   /** @see updatePipeline(String, ExtendedBlock, ExtendedBlock, DatanodeID[]) */
-  void updatePipelineInternal(String clientName, ExtendedBlock oldBlock, 
+  private void updatePipelineInternal(String clientName, ExtendedBlock oldBlock, 
       ExtendedBlock newBlock, DatanodeID[] newNodes)
       throws IOException {
     assert hasWriteLock();
@@ -4043,7 +3992,7 @@ public class FSNamesystem implements FSConstants, FSNamesystemMBean,
    * Returns the DelegationTokenSecretManager instance in the namesystem.
    * @return delegation token secret manager object
    */
-  public DelegationTokenSecretManager getDelegationTokenSecretManager() {
+  DelegationTokenSecretManager getDelegationTokenSecretManager() {
     return dtSecretManager;
   }
 
@@ -4096,7 +4045,7 @@ public class FSNamesystem implements FSConstants, FSNamesystemMBean,
    * @throws InvalidToken
    * @throws IOException
    */
-  public long renewDelegationToken(Token<DelegationTokenIdentifier> token)
+  long renewDelegationToken(Token<DelegationTokenIdentifier> token)
       throws InvalidToken, IOException {
     long expiryTime;
     writeLock();
@@ -4127,7 +4076,7 @@ public class FSNamesystem implements FSConstants, FSNamesystemMBean,
    * @param token
    * @throws IOException
    */
-  public void cancelDelegationToken(Token<DelegationTokenIdentifier> token)
+  void cancelDelegationToken(Token<DelegationTokenIdentifier> token)
       throws IOException {
     writeLock();
     try {

hdfs/src/java/org/apache/hadoop/hdfs/server/namenode/NameNode.java

@@ -626,7 +626,7 @@ public class NameNode implements NamenodeProtocols, FSConstants {
         "Unexpected not positive size: "+size);
     }
 
-    return namesystem.getBlocks(datanode, size); 
+    return namesystem.getBlockManager().getBlocks(datanode, size); 
   }
 
   @Override // NamenodeProtocol
@@ -1039,7 +1039,8 @@ public class NameNode implements NamenodeProtocols, FSConstants {
 
   @Override // ClientProtocol
   public void refreshNodes() throws IOException {
-    namesystem.refreshNodes(new HdfsConfiguration());
+    namesystem.getBlockManager().getDatanodeManager().refreshNodes(
+        new HdfsConfiguration());
   }
 
   @Override // NamenodeProtocol

hdfs/src/java/org/apache/hadoop/hdfs/util/RwLock.java

@@ -0,0 +1,42 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.hadoop.hdfs.util;
+
+/** Read-write lock interface. */
+public interface RwLock {
+  /** Acquire read lock. */
+  public void readLock();
+
+  /** Release read lock. */
+  public void readUnlock();
+
+  /** Check if the current thread holds read lock. */
+  public boolean hasReadLock();
+
+  /** Acquire write lock. */
+  public void writeLock();
+
+  /** Release write lock. */
+  public void writeUnlock();
+
+  /** Check if the current thread holds write lock. */
+  public boolean hasWriteLock();
+
+  /** Check if the current thread holds read or write lock. */
+  public boolean hasReadOrWriteLock();
+}

hdfs/src/test/hdfs/org/apache/hadoop/fs/TestResolveHdfsSymlink.java

@@ -27,6 +27,7 @@ import org.apache.hadoop.hdfs.DFSTestUtil;
 import org.apache.hadoop.hdfs.HdfsConfiguration;
 import org.apache.hadoop.hdfs.MiniDFSCluster;
 import org.apache.hadoop.hdfs.security.token.delegation.DelegationTokenIdentifier;
+import org.apache.hadoop.hdfs.server.namenode.NameNodeAdapter;
 import org.apache.hadoop.security.UserGroupInformation;
 import org.apache.hadoop.security.token.Token;
 import org.apache.hadoop.security.token.delegation.AbstractDelegationTokenIdentifier;
@@ -47,8 +48,8 @@ public class TestResolveHdfsSymlink {
   public static void setUp() throws IOException {
     Configuration conf = new HdfsConfiguration();
     cluster = new MiniDFSCluster.Builder(conf).build();
-    cluster.getNamesystem().getDelegationTokenSecretManager().startThreads();
     cluster.waitActive();
+    NameNodeAdapter.getDtSecretManager(cluster.getNamesystem()).startThreads();
   }
 
   @AfterClass

hdfs/src/test/hdfs/org/apache/hadoop/fs/viewfs/TestViewFileSystemHdfs.java

@@ -28,6 +28,7 @@ import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.fs.FileSystem;
 import org.apache.hadoop.fs.Path;
 import org.apache.hadoop.hdfs.MiniDFSCluster;
+import org.apache.hadoop.hdfs.server.namenode.NameNodeAdapter;
 import org.apache.hadoop.security.UserGroupInformation;
 import org.apache.hadoop.security.token.Token;
 
@@ -52,7 +53,7 @@ public class TestViewFileSystemHdfs extends ViewFileSystemBaseTest {
     SupportsBlocks = true;
     cluster = new MiniDFSCluster.Builder(CONF).numDataNodes(2).build();
     cluster.waitClusterUp();
-    cluster.getNamesystem().getDelegationTokenSecretManager().startThreads();
+    NameNodeAdapter.getDtSecretManager(cluster.getNamesystem()).startThreads();
     fHdfs = cluster.getFileSystem();
     defaultWorkingDirectory = fHdfs.makeQualified( new Path("/user/" + 
         UserGroupInformation.getCurrentUser().getShortUserName()));

hdfs/src/test/hdfs/org/apache/hadoop/fs/viewfs/TestViewFsHdfs.java

@@ -28,6 +28,7 @@ import org.apache.hadoop.fs.FileContext;
 import org.apache.hadoop.fs.Path;
 import org.apache.hadoop.hdfs.HdfsConfiguration;
 import org.apache.hadoop.hdfs.MiniDFSCluster;
+import org.apache.hadoop.hdfs.server.namenode.NameNodeAdapter;
 import org.apache.hadoop.security.UserGroupInformation;
 import org.apache.hadoop.security.token.Token;
 
@@ -52,7 +53,7 @@ public class TestViewFsHdfs extends ViewFsBaseTest {
     SupportsBlocks = true;
     cluster = new MiniDFSCluster.Builder(CONF).numDataNodes(2).build();
     cluster.waitClusterUp();
-    cluster.getNamesystem().getDelegationTokenSecretManager().startThreads();
+    NameNodeAdapter.getDtSecretManager(cluster.getNamesystem()).startThreads();
     fc = FileContext.getFileContext(cluster.getURI(0), CONF);
     defaultWorkingDirectory = fc.makeQualified( new Path("/user/" + 
         UserGroupInformation.getCurrentUser().getShortUserName()));

hdfs/src/test/hdfs/org/apache/hadoop/hdfs/MiniDFSCluster.java

@@ -48,13 +48,13 @@ import org.apache.hadoop.hdfs.protocol.ClientProtocol;
 import org.apache.hadoop.hdfs.protocol.DatanodeInfo;
 import org.apache.hadoop.hdfs.protocol.ExtendedBlock;
 import org.apache.hadoop.hdfs.protocol.FSConstants.DatanodeReportType;
-import org.apache.hadoop.hdfs.server.common.Storage;
 import org.apache.hadoop.hdfs.server.common.HdfsConstants.StartupOption;
+import org.apache.hadoop.hdfs.server.common.Storage;
 import org.apache.hadoop.hdfs.server.datanode.DataNode;
+import org.apache.hadoop.hdfs.server.datanode.DataNodeTestUtils;
 import org.apache.hadoop.hdfs.server.datanode.DataStorage;
 import org.apache.hadoop.hdfs.server.datanode.FSDatasetInterface;
 import org.apache.hadoop.hdfs.server.datanode.SimulatedFSDataset;
-import org.apache.hadoop.hdfs.server.datanode.DataNodeTestUtils;
 import org.apache.hadoop.hdfs.server.namenode.FSNamesystem;
 import org.apache.hadoop.hdfs.server.namenode.NameNode;
 import org.apache.hadoop.hdfs.server.namenode.NameNodeAdapter;
@@ -71,7 +71,6 @@ import org.apache.hadoop.security.RefreshUserMappingsProtocol;
 import org.apache.hadoop.security.UserGroupInformation;
 import org.apache.hadoop.security.authorize.ProxyUsers;
 import org.apache.hadoop.security.authorize.RefreshAuthorizationPolicyProtocol;
-import org.apache.hadoop.test.GenericTestUtils;
 import org.apache.hadoop.tools.GetUserMappingsProtocol;
 import org.apache.hadoop.util.StringUtils;
 import org.apache.hadoop.util.ToolRunner;
@@ -1659,9 +1658,7 @@ public class MiniDFSCluster {
    * Set the softLimit and hardLimit of client lease periods
    */
   public void setLeasePeriod(long soft, long hard) {
-    final FSNamesystem namesystem = getNamesystem();
-    namesystem.leaseManager.setLeasePeriod(soft, hard);
-    namesystem.lmthread.interrupt();
+    NameNodeAdapter.setLeasePeriod(getNamesystem(), soft, hard);
   }
 
   /**

hdfs/src/test/hdfs/org/apache/hadoop/hdfs/TestDFSRemove.java

@@ -17,7 +17,8 @@
  */
 package org.apache.hadoop.hdfs;
 
-import java.io.*;
+import java.io.DataOutputStream;
+import java.io.IOException;
 
 import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.fs.FileStatus;
@@ -27,10 +28,6 @@ import org.apache.hadoop.hdfs.protocol.FSConstants;
 import org.apache.hadoop.hdfs.server.datanode.DataNode;
 
 public class TestDFSRemove extends junit.framework.TestCase {
-  static int countLease(MiniDFSCluster cluster) {
-    return cluster.getNamesystem().leaseManager.countLease();
-  }
-  
   final Path dir = new Path("/test/remove/");
 
   void list(FileSystem fs, String name) throws IOException {

hdfs/src/test/hdfs/org/apache/hadoop/hdfs/TestDFSRename.java

@@ -17,16 +17,18 @@
  */
 package org.apache.hadoop.hdfs;
 
-import java.io.*;
+import java.io.DataOutputStream;
+import java.io.IOException;
 
 import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.fs.FileStatus;
 import org.apache.hadoop.fs.FileSystem;
 import org.apache.hadoop.fs.Path;
+import org.apache.hadoop.hdfs.server.namenode.NameNodeAdapter;
 
 public class TestDFSRename extends junit.framework.TestCase {
   static int countLease(MiniDFSCluster cluster) {
-    return cluster.getNamesystem().leaseManager.countLease();
+    return NameNodeAdapter.getLeaseManager(cluster.getNamesystem()).countLease();
   }
   
   final Path dir = new Path("/test/rename/");

hdfs/src/test/hdfs/org/apache/hadoop/hdfs/TestDecommission.java

@@ -17,6 +17,10 @@
  */
 package org.apache.hadoop.hdfs;
 
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertNull;
+import static org.junit.Assert.assertTrue;
+
 import java.io.IOException;
 import java.util.ArrayList;
 import java.util.Collection;
@@ -30,14 +34,12 @@ import org.apache.hadoop.fs.FSDataOutputStream;
 import org.apache.hadoop.fs.FileSystem;
 import org.apache.hadoop.fs.Path;
 import org.apache.hadoop.hdfs.protocol.DatanodeInfo;
-import org.apache.hadoop.hdfs.protocol.LocatedBlock;
 import org.apache.hadoop.hdfs.protocol.DatanodeInfo.AdminStates;
 import org.apache.hadoop.hdfs.protocol.FSConstants.DatanodeReportType;
+import org.apache.hadoop.hdfs.protocol.LocatedBlock;
 import org.apache.hadoop.hdfs.server.namenode.FSNamesystem;
 import org.apache.hadoop.hdfs.server.namenode.NameNode;
 import org.apache.hadoop.hdfs.server.namenode.NameNodeAdapter;
-import static org.junit.Assert.*;
-
 import org.junit.After;
 import org.junit.Before;
 import org.junit.Test;
@@ -224,7 +226,7 @@ public class TestDecommission {
     }
     nodes.add(nodename);
     writeConfigFile(excludeFile, nodes);
-    cluster.getNamesystem(nnIndex).refreshNodes(conf);
+    refreshNodes(cluster.getNamesystem(nnIndex), conf);
     DatanodeInfo ret = NameNodeAdapter.getDatanode(
         cluster.getNamesystem(nnIndex), info[index]);
     waitNodeState(ret, waitForState);
@@ -235,7 +237,7 @@ public class TestDecommission {
   private void recomissionNode(DatanodeInfo decommissionedNode) throws IOException {
     LOG.info("Recommissioning node: " + decommissionedNode.getName());
     writeConfigFile(excludeFile, null);
-    cluster.getNamesystem().refreshNodes(conf);
+    refreshNodes(cluster.getNamesystem(), conf);
     waitNodeState(decommissionedNode, AdminStates.NORMAL);
 
   }
@@ -284,6 +286,11 @@ public class TestDecommission {
       validateCluster(client, numDatanodes);
     }
   }
+
+  static void refreshNodes(final FSNamesystem ns, final Configuration conf
+      ) throws IOException {
+    ns.getBlockManager().getDatanodeManager().refreshNodes(conf);
+  }
   
   private void verifyStats(NameNode namenode, FSNamesystem fsn,
       DatanodeInfo node, boolean decommissioning) throws InterruptedException {
@@ -465,7 +472,7 @@ public class TestDecommission {
       
       // Stop decommissioning and verify stats
       writeConfigFile(excludeFile, null);
-      fsn.refreshNodes(conf);
+      refreshNodes(fsn, conf);
       DatanodeInfo ret = NameNodeAdapter.getDatanode(fsn, downnode);
       waitNodeState(ret, AdminStates.NORMAL);
       verifyStats(namenode, fsn, ret, false);
@@ -509,7 +516,7 @@ public class TestDecommission {
     writeConfigFile(hostsFile, list);
     
     for (int j = 0; j < numNameNodes; j++) {
-      cluster.getNamesystem(j).refreshNodes(conf);
+      refreshNodes(cluster.getNamesystem(j), conf);
       
       DFSClient client = getDfsClient(cluster.getNameNode(j), conf);
       DatanodeInfo[] info = client.datanodeReport(DatanodeReportType.LIVE);

hdfs/src/test/hdfs/org/apache/hadoop/hdfs/TestLease.java

@@ -24,6 +24,7 @@ import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.fs.FileSystem;
 import org.apache.hadoop.fs.Path;
 import org.apache.hadoop.hdfs.protocol.ClientProtocol;
+import org.apache.hadoop.hdfs.server.namenode.NameNodeAdapter;
 import org.apache.hadoop.security.UserGroupInformation;
 import org.junit.Assert;
 import org.junit.Test;
@@ -31,7 +32,8 @@ import org.mockito.Mockito;
 
 public class TestLease {
   static boolean hasLease(MiniDFSCluster cluster, Path src) {
-    return cluster.getNamesystem().leaseManager.getLeaseByPath(src.toString()) != null;
+    return NameNodeAdapter.getLeaseManager(cluster.getNamesystem()
+        ).getLeaseByPath(src.toString()) != null;
   }
   
   final Path dir = new Path("/test/lease/");

hdfs/src/test/hdfs/org/apache/hadoop/hdfs/TestLeaseRecovery.java

@@ -29,6 +29,7 @@ import org.apache.hadoop.hdfs.protocol.LocatedBlock;
 import org.apache.hadoop.hdfs.server.datanode.DataNode;
 import org.apache.hadoop.hdfs.server.datanode.TestInterDatanodeProtocol;
 import org.apache.hadoop.hdfs.server.namenode.LeaseManager;
+import org.apache.hadoop.hdfs.server.namenode.NameNodeAdapter;
 
 public class TestLeaseRecovery extends junit.framework.TestCase {
   static final int BLOCK_SIZE = 1024;
@@ -133,7 +134,7 @@ public class TestLeaseRecovery extends junit.framework.TestCase {
       DFSTestUtil.waitReplication(dfs, filepath, (short)1);
       waitLeaseRecovery(cluster);
       // verify that we still cannot recover the lease
-      LeaseManager lm = cluster.getNamesystem().leaseManager;
+      LeaseManager lm = NameNodeAdapter.getLeaseManager(cluster.getNamesystem());
       assertTrue("Found " + lm.countLease() + " lease, expected 1", lm.countLease() == 1);
       cluster.getNameNode().setSafeMode(FSConstants.SafeModeAction.SAFEMODE_LEAVE);
     }

hdfs/src/test/hdfs/org/apache/hadoop/hdfs/security/TestDelegationToken.java

@@ -37,6 +37,7 @@ import org.apache.hadoop.hdfs.HdfsConfiguration;
 import org.apache.hadoop.hdfs.MiniDFSCluster;
 import org.apache.hadoop.hdfs.security.token.delegation.DelegationTokenIdentifier;
 import org.apache.hadoop.hdfs.security.token.delegation.DelegationTokenSecretManager;
+import org.apache.hadoop.hdfs.server.namenode.NameNodeAdapter;
 import org.apache.hadoop.io.Text;
 import org.apache.hadoop.security.AccessControlException;
 import org.apache.hadoop.security.UserGroupInformation;
@@ -48,7 +49,8 @@ import org.junit.Test;
 
 public class TestDelegationToken {
   private MiniDFSCluster cluster;
-  Configuration config;
+  private DelegationTokenSecretManager dtSecretManager;
+  private Configuration config;
   private static final Log LOG = LogFactory.getLog(TestDelegationToken.class);
   
   @Before
@@ -61,7 +63,9 @@ public class TestDelegationToken {
     FileSystem.setDefaultUri(config, "hdfs://localhost:" + "0");
     cluster = new MiniDFSCluster.Builder(config).build();
     cluster.waitActive();
-    cluster.getNamesystem().getDelegationTokenSecretManager().startThreads();
+    dtSecretManager = NameNodeAdapter.getDtSecretManager(
+        cluster.getNamesystem());
+    dtSecretManager.startThreads();
   }
 
   @After
@@ -73,8 +77,6 @@ public class TestDelegationToken {
 
   private Token<DelegationTokenIdentifier> generateDelegationToken(
       String owner, String renewer) {
-    DelegationTokenSecretManager dtSecretManager = cluster.getNamesystem()
-        .getDelegationTokenSecretManager();
     DelegationTokenIdentifier dtId = new DelegationTokenIdentifier(new Text(
         owner), new Text(renewer), null);
     return new Token<DelegationTokenIdentifier>(dtId, dtSecretManager);
@@ -82,8 +84,6 @@ public class TestDelegationToken {
   
   @Test
   public void testDelegationTokenSecretManager() throws Exception {
-    DelegationTokenSecretManager dtSecretManager = cluster.getNamesystem()
-        .getDelegationTokenSecretManager();
     Token<DelegationTokenIdentifier> token = generateDelegationToken(
         "SomeUser", "JobTracker");
     // Fake renewer should not be able to renew
@@ -122,8 +122,6 @@ public class TestDelegationToken {
   
   @Test 
   public void testCancelDelegationToken() throws Exception {
-    DelegationTokenSecretManager dtSecretManager = cluster.getNamesystem()
-        .getDelegationTokenSecretManager();
     Token<DelegationTokenIdentifier> token = generateDelegationToken(
         "SomeUser", "JobTracker");
     //Fake renewer should not be able to renew
@@ -144,7 +142,6 @@ public class TestDelegationToken {
   
   @Test
   public void testDelegationTokenDFSApi() throws Exception {
-    DelegationTokenSecretManager dtSecretManager = cluster.getNamesystem().getDelegationTokenSecretManager();
     DistributedFileSystem dfs = (DistributedFileSystem) cluster.getFileSystem();
     Token<DelegationTokenIdentifier> token = dfs.getDelegationToken("JobTracker");
     DelegationTokenIdentifier identifier = new DelegationTokenIdentifier();

hdfs/src/test/hdfs/org/apache/hadoop/hdfs/security/TestDelegationTokenForProxyUser.java

@@ -31,19 +31,20 @@ import java.util.Enumeration;
 
 import junit.framework.Assert;
 
+import org.apache.commons.logging.Log;
+import org.apache.commons.logging.LogFactory;
 import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.fs.FileSystem;
 import org.apache.hadoop.hdfs.DFSConfigKeys;
 import org.apache.hadoop.hdfs.DistributedFileSystem;
 import org.apache.hadoop.hdfs.HdfsConfiguration;
 import org.apache.hadoop.hdfs.MiniDFSCluster;
-import org.apache.hadoop.io.Text;
-import org.apache.commons.logging.*;
+import org.apache.hadoop.hdfs.security.token.delegation.DelegationTokenIdentifier;
+import org.apache.hadoop.hdfs.server.namenode.NameNodeAdapter;
 import org.apache.hadoop.security.TestDoAsEffectiveUser;
 import org.apache.hadoop.security.UserGroupInformation;
 import org.apache.hadoop.security.authorize.ProxyUsers;
 import org.apache.hadoop.security.token.Token;
-import org.apache.hadoop.hdfs.security.token.delegation.DelegationTokenIdentifier;
 import org.junit.After;
 import org.junit.Before;
 import org.junit.Test;
@@ -98,7 +99,7 @@ public class TestDelegationTokenForProxyUser {
     FileSystem.setDefaultUri(config, "hdfs://localhost:" + "0");
     cluster = new MiniDFSCluster.Builder(config).build();
     cluster.waitActive();
-    cluster.getNamesystem().getDelegationTokenSecretManager().startThreads();
+    NameNodeAdapter.getDtSecretManager(cluster.getNamesystem()).startThreads();
     ProxyUsers.refreshSuperUserGroupsConfiguration(config);
   }
 

hdfs/src/test/hdfs/org/apache/hadoop/hdfs/server/blockmanagement/TestBlocksWithNotEnoughRacks.java

@@ -413,7 +413,7 @@ public class TestBlocksWithNotEnoughRacks {
           fs.getFileStatus(filePath), 0, Long.MAX_VALUE);
       String name = locs[0].getNames()[0];
       DFSTestUtil.writeFile(localFileSys, excludeFile, name);
-      ns.refreshNodes(conf);
+      ns.getBlockManager().getDatanodeManager().refreshNodes(conf);
       DFSTestUtil.waitForDecommission(fs, name);
 
       // Check the block still has sufficient # replicas across racks
@@ -468,7 +468,7 @@ public class TestBlocksWithNotEnoughRacks {
         if (!top.startsWith("/rack2")) {
           String name = top.substring("/rack1".length()+1);
           DFSTestUtil.writeFile(localFileSys, excludeFile, name);
-          ns.refreshNodes(conf);
+          ns.getBlockManager().getDatanodeManager().refreshNodes(conf);
           DFSTestUtil.waitForDecommission(fs, name);
           break;
         }

hdfs/src/test/hdfs/org/apache/hadoop/hdfs/server/blockmanagement/TestHeartbeatHandling.java

@@ -17,7 +17,6 @@
  */
 package org.apache.hadoop.hdfs.server.blockmanagement;
 
-import java.io.IOException;
 import java.util.ArrayList;
 
 import junit.framework.TestCase;
@@ -76,7 +75,7 @@ public class TestHeartbeatHandling extends TestCase {
             dd.addBlockToBeReplicated(
                 new Block(i, 0, GenerationStamp.FIRST_VALID_STAMP), ONE_TARGET);
           }
-          DatanodeCommand[]cmds = sendHeartBeat(nodeReg, dd, namesystem);
+          DatanodeCommand[]cmds = NameNodeAdapter.sendHeartBeat(nodeReg, dd, namesystem);
           assertEquals(1, cmds.length);
           assertEquals(DatanodeProtocol.DNA_TRANSFER, cmds[0].getAction());
           assertEquals(MAX_REPLICATE_LIMIT, ((BlockCommand)cmds[0]).getBlocks().length);
@@ -86,26 +85,26 @@ public class TestHeartbeatHandling extends TestCase {
             blockList.add(new Block(i, 0, GenerationStamp.FIRST_VALID_STAMP));
           }
           dd.addBlocksToBeInvalidated(blockList);
-          cmds = sendHeartBeat(nodeReg, dd, namesystem);
+          cmds = NameNodeAdapter.sendHeartBeat(nodeReg, dd, namesystem);
           assertEquals(2, cmds.length);
           assertEquals(DatanodeProtocol.DNA_TRANSFER, cmds[0].getAction());
           assertEquals(MAX_REPLICATE_LIMIT, ((BlockCommand)cmds[0]).getBlocks().length);
           assertEquals(DatanodeProtocol.DNA_INVALIDATE, cmds[1].getAction());
           assertEquals(MAX_INVALIDATE_LIMIT, ((BlockCommand)cmds[1]).getBlocks().length);
           
-          cmds = sendHeartBeat(nodeReg, dd, namesystem);
+          cmds = NameNodeAdapter.sendHeartBeat(nodeReg, dd, namesystem);
           assertEquals(2, cmds.length);
           assertEquals(DatanodeProtocol.DNA_TRANSFER, cmds[0].getAction());
           assertEquals(REMAINING_BLOCKS, ((BlockCommand)cmds[0]).getBlocks().length);
           assertEquals(DatanodeProtocol.DNA_INVALIDATE, cmds[1].getAction());
           assertEquals(MAX_INVALIDATE_LIMIT, ((BlockCommand)cmds[1]).getBlocks().length);
           
-          cmds = sendHeartBeat(nodeReg, dd, namesystem);
+          cmds = NameNodeAdapter.sendHeartBeat(nodeReg, dd, namesystem);
           assertEquals(1, cmds.length);
           assertEquals(DatanodeProtocol.DNA_INVALIDATE, cmds[0].getAction());
           assertEquals(REMAINING_BLOCKS, ((BlockCommand)cmds[0]).getBlocks().length);
 
-          cmds = sendHeartBeat(nodeReg, dd, namesystem);
+          cmds = NameNodeAdapter.sendHeartBeat(nodeReg, dd, namesystem);
           assertEquals(null, cmds);
         }
       } finally {
@@ -115,10 +114,4 @@ public class TestHeartbeatHandling extends TestCase {
       cluster.shutdown();
     }
   }
-  
-  private static DatanodeCommand[] sendHeartBeat(DatanodeRegistration nodeReg,
-      DatanodeDescriptor dd, FSNamesystem namesystem) throws IOException {
-    return namesystem.handleHeartbeat(nodeReg, dd.getCapacity(), 
-        dd.getDfsUsed(), dd.getRemaining(), dd.getBlockPoolUsed(), 0, 0, 0);
-  }
 }

hdfs/src/test/hdfs/org/apache/hadoop/hdfs/server/namenode/NameNodeAdapter.java

@@ -21,7 +21,10 @@ import java.io.IOException;
 
 import org.apache.hadoop.hdfs.protocol.DatanodeID;
 import org.apache.hadoop.hdfs.protocol.LocatedBlocks;
+import org.apache.hadoop.hdfs.security.token.delegation.DelegationTokenSecretManager;
 import org.apache.hadoop.hdfs.server.blockmanagement.DatanodeDescriptor;
+import org.apache.hadoop.hdfs.server.protocol.DatanodeCommand;
+import org.apache.hadoop.hdfs.server.protocol.DatanodeRegistration;
 import org.apache.hadoop.ipc.Server;
 
 /**
@@ -52,11 +55,32 @@ public class NameNodeAdapter {
     return namenode.server;
   }
 
+  public static DelegationTokenSecretManager getDtSecretManager(
+      final FSNamesystem ns) {
+    return ns.getDelegationTokenSecretManager();
+  }
+
+  public static DatanodeCommand[] sendHeartBeat(DatanodeRegistration nodeReg,
+      DatanodeDescriptor dd, FSNamesystem namesystem) throws IOException {
+    return namesystem.handleHeartbeat(nodeReg, dd.getCapacity(), 
+        dd.getDfsUsed(), dd.getRemaining(), dd.getBlockPoolUsed(), 0, 0, 0);
+  }
+
   public static boolean setReplication(final FSNamesystem ns,
       final String src, final short replication) throws IOException {
     return ns.setReplication(src, replication);
   }
   
+  public static LeaseManager getLeaseManager(final FSNamesystem ns) {
+    return ns.leaseManager;
+  }
+
+  /** Set the softLimit and hardLimit of client lease periods. */
+  public static void setLeasePeriod(final FSNamesystem namesystem, long soft, long hard) {
+    getLeaseManager(namesystem).setLeasePeriod(soft, hard);
+    namesystem.lmthread.interrupt();
+  }
+
   public static String getLeaseHolderForPath(NameNode namenode, String path) {
     return namenode.getNamesystem().leaseManager.getLeaseByPath(path).getHolder();
   }

hdfs/src/test/hdfs/org/apache/hadoop/hdfs/server/namenode/TestDecommissioningStatus.java

@@ -148,7 +148,7 @@ public class TestDecommissioningStatus {
   /*
    * Decommissions the node at the given index
    */
-  private String decommissionNode(FSNamesystem namesystem, Configuration conf,
+  private String decommissionNode(FSNamesystem namesystem,
       DFSClient client, FileSystem localFileSys, int nodeIndex)
       throws IOException {
     DatanodeInfo[] info = client.datanodeReport(DatanodeReportType.LIVE);
@@ -160,7 +160,6 @@ public class TestDecommissioningStatus {
     ArrayList<String> nodes = new ArrayList<String>(decommissionedNodes);
     nodes.add(nodename);
     writeConfigFile(localFileSys, excludeFile, nodes);
-    namesystem.refreshNodes(conf);
     return nodename;
   }
 
@@ -203,8 +202,8 @@ public class TestDecommissioningStatus {
     FSNamesystem fsn = cluster.getNamesystem();
     final DatanodeManager dm = fsn.getBlockManager().getDatanodeManager();
     for (int iteration = 0; iteration < numDatanodes; iteration++) {
-      String downnode = decommissionNode(fsn, conf, client, localFileSys,
-          iteration);
+      String downnode = decommissionNode(fsn, client, localFileSys, iteration);
+      dm.refreshNodes(conf);
       decommissionedNodes.add(downnode);
       Thread.sleep(5000);
       final List<DatanodeDescriptor> decommissioningNodes = dm.getDecommissioningNodes();
@@ -224,7 +223,7 @@ public class TestDecommissioningStatus {
     // This will remove the datanodes from decommissioning list and
     // make them available again.
     writeConfigFile(localFileSys, excludeFile, null);
-    fsn.refreshNodes(conf);
+    dm.refreshNodes(conf);
     st1.close();
     cleanupFile(fileSys, file1);
     cleanupFile(fileSys, file2);