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

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

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

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.

        "test.build.data", "build/test/data"), "dfs/");
    conf.set(DFSConfigKeys.DFS_NAMENODE_NAME_DIR_KEY,
        new File(baseDir, "name").getPath());


    DFSTestUtil.formatNameNode(conf);
    namenode = new NameNode(conf);


    final BlockManager bm = namenode.getNamesystem().getBlockManager();
    replicator = bm.getBlockPlacementPolicy();
    cluster = bm.getDatanodeManager().getNetworkTopology();
    // construct network topology

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      cluster = new MiniDFSCluster.Builder(conf)
        .nnTopology(MiniDFSNNTopology.simpleHATopology())
        .numDataNodes(0)
        .manageNameDfsSharedDirs(false)
        .build();
      NameNode nn1 = cluster.getNameNode(0);
      NameNode nn2 = cluster.getNameNode(1);


      cluster.waitActive();
      cluster.transitionToActive(0);


      Path p = new Path("/testBKJMfailover");

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        .nnTopology(MiniDFSNNTopology.simpleHATopology())
        .numDataNodes(0)
        .manageNameDfsSharedDirs(false)
        .checkExitOnShutdown(false)
        .build();
      NameNode nn1 = cluster.getNameNode(0);
      NameNode nn2 = cluster.getNameNode(1);


      cluster.waitActive();
      cluster.transitionToActive(0);


      Path p1 = new Path("/testBKJMFailingBKCluster1");

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        .nnTopology(MiniDFSNNTopology.simpleHATopology())
        .numDataNodes(0)
        .manageNameDfsSharedDirs(false)
        .checkExitOnShutdown(false)
        .build();
      NameNode nn1 = cluster.getNameNode(0);
      NameNode nn2 = cluster.getNameNode(1);
      cluster.waitActive();
      cluster.transitionToActive(0);


      FileSystem fs = HATestUtil.configureFailoverFs(cluster, conf);
      fs.mkdirs(p1);

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    // Start the NameNode
    String[] args = (operation == null ||
                     operation == StartupOption.FORMAT ||
                     operation == StartupOption.REGULAR) ?
      new String[] {} : new String[] {operation.getName()};
    NameNode nn =  NameNode.createNameNode(args, conf);
    if (operation == StartupOption.RECOVER) {
      return;
    }
    
    // After the NN has started, set back the bound ports into
    // the conf
    conf.set(DFSUtil.addKeySuffixes(
        DFS_NAMENODE_RPC_ADDRESS_KEY, nameserviceId, nnId), NetUtils
        .getHostPortString(nn.getNameNodeAddress()));
    conf.set(DFSUtil.addKeySuffixes(
        DFS_NAMENODE_HTTP_ADDRESS_KEY, nameserviceId, nnId), NetUtils
        .getHostPortString(nn.getHttpAddress()));
    DFSUtil.setGenericConf(conf, nameserviceId, nnId,
        DFS_NAMENODE_HTTP_ADDRESS_KEY);
    nameNodes[nnIndex] = new NameNodeInfo(nn, nameserviceId, nnId,
        new Configuration(conf));
  }

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      }
    }
    shutdownDataNodes();
    for (NameNodeInfo nnInfo : nameNodes) {
      if (nnInfo == null) continue;
      NameNode nameNode = nnInfo.nameNode;
      if (nameNode != null) {
        nameNode.stop();
        nameNode.join();
        nameNode = null;
      }
    }
  }

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  /**
   * Shutdown the namenode at a given index.
   */
  public synchronized void shutdownNameNode(int nnIndex) {
    NameNode nn = nameNodes[nnIndex].nameNode;
    if (nn != null) {
      LOG.info("Shutting down the namenode");
      nn.stop();
      nn.join();
      Configuration conf = nameNodes[nnIndex].conf;
      nameNodes[nnIndex] = new NameNodeInfo(null, null, null, conf);
    }
  }

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      throws IOException {
    String nameserviceId = nameNodes[nnIndex].nameserviceId;
    String nnId = nameNodes[nnIndex].nnId;
    Configuration conf = nameNodes[nnIndex].conf;
    shutdownNameNode(nnIndex);
    NameNode nn = NameNode.createNameNode(new String[] {}, conf);
    nameNodes[nnIndex] = new NameNodeInfo(nn, nameserviceId, nnId, conf);
    if (waitActive) {
      waitClusterUp();
      LOG.info("Restarted the namenode");
      waitActive();

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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 nameNode = nameNodes[nnIndex].nameNode;
    if (nameNode == null) {
      return false;
    }
    long[] sizes;
    sizes = NameNodeAdapter.getStats(nameNode.getNamesystem());
    boolean isUp = false;
    synchronized (this) {
      isUp = ((!nameNode.isInSafeMode() || !waitSafeMode) &&
          sizes[ClientProtocol.GET_STATS_CAPACITY_IDX] != 0);
    }
    return isUp;
  }

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  /**
   * Check whether the name-node can be started.
   */
  private boolean canStartNameNode(Configuration conf) throws IOException {
    NameNode nn2 = null;
    try {
      nn2 = NameNode.createNameNode(new String[]{}, conf);
    } catch(IOException e) {
      if (e instanceof java.net.BindException)
        return false;

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