Examples of org.apache.hadoop.hdfs.server.namenode.NameNode

Package org.apache.hadoop.hdfs.server.namenode

Examples of org.apache.hadoop.hdfs.server.namenode.NameNode

org.apache.hadoop.hdfs.server.namenode.NameNode
NameNode serves as both directory namespace manager and "inode table" for the Hadoop DFS. There is a single NameNode running in any DFS deployment. (Well, except when there is a second backup/failover NameNode.) The NameNode controls two critical tables: 1) filename->blocksequence (namespace) 2) block->machinelist ("inodes") The first table is stored on disk and is very precious. The second table is rebuilt every time the NameNode comes up. 'NameNode' refers to both this class as well as the 'NameNode server'. The 'FSNamesystem' class actually performs most of the filesystem management. The majority of the 'NameNode' class itself is concerned with exposing the IPC interface and the http server to the outside world, plus some configuration management. NameNode implements the ClientProtocol interface, which allows clients to ask for DFS services. ClientProtocol is not designed for direct use by authors of DFS client code. End-users should instead use the org.apache.nutch.hadoop.fs.FileSystem class. NameNode also implements the DatanodeProtocol interface, used by DataNode programs that actually store DFS data blocks. These methods are invoked repeatedly and automatically by all the DataNodes in a DFS deployment. NameNode also implements the NamenodeProtocol interface, used by secondary namenodes or rebalancing processes to get partial namenode's state, for example partial blocksMap etc.

  private void createFederatedNameNode(int nnIndex, Configuration conf,
      int numDataNodes, boolean manageNameDfsDirs, boolean format,
      StartupOption operation, String nameserviceId)
      throws IOException {
    conf.set(FSConstants.DFS_FEDERATION_NAMESERVICE_ID, nameserviceId);
    NameNode nn = createNameNode(nnIndex, conf, numDataNodes, manageNameDfsDirs,
        format, operation, nameserviceId);
    DFSUtil.setGenericConf(conf, nameserviceId, 
        NameNode.NAMESERVICE_SPECIFIC_KEYS);
    conf.set(DFSUtil.getNameServiceIdKey(
        FSConstants.DFS_NAMENODE_HTTP_ADDRESS_KEY, nameserviceId), NameNode
        .getHostPortString(nn.getHttpAddress()));
    conf.set(DFSUtil.getNameServiceIdKey(
        NameNode.DATANODE_PROTOCOL_ADDRESS, nameserviceId), NameNode
        .getHostPortString(nn.getNameNodeDNAddress()));
    nameNodes[nnIndex] = new NameNodeInfo(nn, new Configuration(conf));
  }

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   */
  public void shutdown(boolean remove) {
    System.out.println("Shutting down the Mini HDFS Cluster");
    shutdownDataNodes(remove);
    for (NameNodeInfo nnInfo : nameNodes) {
      NameNode nameNode = nnInfo.nameNode;
      if (nameNode != null) {
        nameNode.stop();
        nameNode.join();
        nameNode = null;
      }
    }
  }

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  /**
   * Shutdown one namenode
   */
  public synchronized void shutdownNameNode(int nnIndex) {
    NameNode nn = nameNodes[nnIndex].nameNode;
    if (nn != null) {
      System.out.println("Shutting down the namenode");
      nn.stop();
      nn.join();
      Configuration conf = nameNodes[nnIndex].conf;
      nameNodes[nnIndex] = new NameNodeInfo(null, conf);
    }
  }

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  }


  public synchronized void restartNameNode(int nnIndex, String[] argv, boolean waitActive) throws IOException {
    shutdownNameNode(nnIndex);
    Configuration conf = nameNodes[nnIndex].conf;
    NameNode nn = NameNode.createNameNode(argv, conf);
    nameNodes[nnIndex] = new NameNodeInfo(nn, conf);
    if (!waitActive) {
      return;
    }
    waitClusterUp();

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  /**
   * Returns true if the NameNode is running and is out of Safe Mode
   * or if waiting for safe mode is disabled.
   */
  public boolean isNameNodeUp(int nnIndex) {
    NameNode nn = nameNodes[nnIndex].nameNode;
    if (nn == null) {
      return false;
    }
    try {
      long[] sizes = nn.getStats();
      boolean isUp = false;
      synchronized (this) {
        isUp = ((!nn.isInSafeMode() || !waitSafeMode) && sizes[0] != 0);
      }
      return isUp;
    } catch (IOException ie) {
      return false;
    }

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   */
  public void waitActive(boolean waitHeartbeats, int nnIndex) throws IOException {
    if (nnIndex < 0 || nnIndex >= nameNodes.length || nameNodes[nnIndex] == null) {
      return;
    }
    NameNode nn = nameNodes[nnIndex].nameNode;
    if (nn == null) {
      return;
    }
    InetSocketAddress addr = nn.getNameNodeAddress();
    // Wait for the client server to start if we have two configured
    while (addr == null) {
      try {
        Thread.sleep(100);
      } catch (Exception e) {
      }
      addr = nn.getNameNodeAddress();
    }
    addr = nn.getNameNodeDNAddress();
    DFSClient client = new DFSClient(addr, nn.getConf());


    // make sure all datanodes are alive and sent heartbeat
    while (shouldWait(client.datanodeReport(DatanodeReportType.LIVE),
                      waitHeartbeats, addr)) {
      try {

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  /**
   * Set the softLimit and hardLimit of client lease periods
   */
  void setLeasePeriod(long soft, long hard) {
    checkSingleNameNode();
    NameNode nn = getNameNode(0);
    nn.namesystem.leaseManager.setLeasePeriod(soft, hard);
    nn.namesystem.lmthread.interrupt();
  }

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      MiniDFSCluster cluster = null;
      try {
        cluster = new MiniDFSCluster(conf, numDataNode, true, null);
        cluster.waitActive();
        FileSystem fs = cluster.getFileSystem();
        NameNode preSpyNN = cluster.getNameNode();
        NameNode spyNN = spy(preSpyNN);
        
        DFSClient client = new DFSClient(null, spyNN, conf, null);
  
        DFSTestUtil.createFile(fs, file, fileSize, 
            (short)numDataNode, 12345L /*seed*/);

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    // Not available in 0.20 hdfs.  Use reflection to make it happen.
    
    // private NameNode nameNode;
    Field field = this.dfsCluster.getClass().getDeclaredField("nameNode");
    field.setAccessible(true);
    NameNode nn = (NameNode)field.get(this.dfsCluster);
    nn.namesystem.leaseManager.setLeasePeriod(100, 50000);
  }

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   * @throws Exception
   */
  @Test
  public void testIsInSafemode() throws Exception {
    // Check for the standby nn without client failover.
    NameNode nn2 = cluster.getNameNode(1);
    assertTrue("nn2 should be in standby state", nn2.isStandbyState());


    InetSocketAddress nameNodeAddress = nn2.getNameNodeAddress();
    Configuration conf = new Configuration();
    DistributedFileSystem dfs = new DistributedFileSystem();
    try {
      dfs.initialize(
          URI.create("hdfs://" + nameNodeAddress.getHostName() + ":"

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