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.

    try {
      cluster = new MiniDFSCluster.Builder(conf).numDataNodes(numDataNodes).build();
      cluster.waitActive();
      assertEquals(numDataNodes, cluster.getDataNodes().size());


      final NameNode nn = cluster.getNameNode();
      final NamenodeProtocols nnProto = nn.getRpcServer();
      final BlockManager bm = nn.getNamesystem().getBlockManager();
      final BlockTokenSecretManager sm = bm.getBlockTokenSecretManager();


      // set a short token lifetime (1 second) initially
      SecurityTestUtil.setBlockTokenLifetime(sm, 1000L);

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    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
    for(int i=0; i<NUM_OF_DATANODES; i++) {

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    conf.setBoolean(
        DFSConfigKeys.DFS_NAMENODE_AVOID_STALE_DATANODE_FOR_WRITE_KEY, true);
    conf.setBoolean(
        DFSConfigKeys.DFS_NAMENODE_REPLICATION_CONSIDERLOAD_KEY, true);
    DFSTestUtil.formatNameNode(conf);
    namenode = new NameNode(conf);
    int blockSize = 1024;


    dnrList = new ArrayList<DatanodeRegistration>();
    dnManager = namenode.getNamesystem().getBlockManager().getDatanodeManager();

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        DFSConfigKeys.DFS_NAMENODE_DELEGATION_KEY_UPDATE_INTERVAL_KEY, 500); 
    cluster.getConfiguration(0).setInt(
        DFSConfigKeys.DFS_NAMENODE_SAFEMODE_EXTENSION_KEY, 30000);
    cluster.setWaitSafeMode(false);
    cluster.restartNameNode();
    NameNode nn = cluster.getNameNode();
    assertTrue(nn.isInSafeMode());
    DelegationTokenSecretManager sm =
      NameNodeAdapter.getDtSecretManager(nn.getNamesystem());
    assertFalse("Secret manager should not run in safe mode", sm.isRunning());
    
    NameNodeAdapter.leaveSafeMode(nn);
    assertTrue("Secret manager should start when safe mode is exited",
        sm.isRunning());
    
    LOG.info("========= entering safemode again");
    
    NameNodeAdapter.enterSafeMode(nn, false);
    assertFalse("Secret manager should stop again when safe mode " +
        "is manually entered", sm.isRunning());
    
    // Set the cluster to leave safemode quickly on its own.
    cluster.getConfiguration(0).setInt(
        DFSConfigKeys.DFS_NAMENODE_SAFEMODE_EXTENSION_KEY, 0);
    cluster.setWaitSafeMode(true);
    cluster.restartNameNode();
    nn = cluster.getNameNode();
    sm = NameNodeAdapter.getDtSecretManager(nn.getNamesystem());


    assertFalse(nn.isInSafeMode());
    assertTrue(sm.isRunning());
  }

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      final CreateParentParam createParent,
      final TokenArgumentParam delegationTokenArgument
      ) throws IOException, URISyntaxException {


    final Configuration conf = (Configuration)context.getAttribute(JspHelper.CURRENT_CONF);
    final NameNode namenode = (NameNode)context.getAttribute("name.node");
    final NamenodeProtocols np = namenode.getRpcServer();


    switch(op.getValue()) {
    case CREATE:
    {
      final URI uri = redirectURI(namenode, ugi, delegation, username, doAsUser,

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      final DoAsParam doAsUser,
      final String fullpath,
      final PostOpParam op,
      final BufferSizeParam bufferSize
      ) throws IOException, URISyntaxException {
    final NameNode namenode = (NameNode)context.getAttribute("name.node");


    switch(op.getValue()) {
    case APPEND:
    {
      final URI uri = redirectURI(namenode, ugi, delegation, username, doAsUser,

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      final OffsetParam offset,
      final LengthParam length,
      final RenewerParam renewer,
      final BufferSizeParam bufferSize
      ) throws IOException, URISyntaxException {
    final NameNode namenode = (NameNode)context.getAttribute("name.node");
    final NamenodeProtocols np = namenode.getRpcServer();


    switch(op.getValue()) {
    case OPEN:
    {
      final URI uri = redirectURI(namenode, ugi, delegation, username, doAsUser,

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      final DoAsParam doAsUser,
      final String fullpath,
      final DeleteOpParam op,
      final RecursiveParam recursive
      ) throws IOException {
    final NameNode namenode = (NameNode)context.getAttribute("name.node");


    switch(op.getValue()) {
    case DELETE:
    {
      final boolean b = namenode.getRpcServer().delete(fullpath, recursive.getValue());
      final String js = JsonUtil.toJsonString("boolean", b);
      return Response.ok(js).type(MediaType.APPLICATION_JSON).build();
    }
    default:
      throw new UnsupportedOperationException(op + " is not supported");

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        new ByteArrayInputStream(token.getIdentifier());
    DataInputStream in = new DataInputStream(buf);
    DelegationTokenIdentifier id = new DelegationTokenIdentifier();
    id.readFields(in);
    if (context != null) {
      final NameNode nn = NameNodeHttpServer.getNameNodeFromContext(context);
      if (nn != null) {
        // Verify the token.
        nn.getNamesystem().verifyToken(id, token.getPassword());
      }
    }
    UserGroupInformation ugi = id.getUser();
    ugi.addToken(token);
    return ugi;

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        new ByteArrayInputStream(token.getIdentifier());
    DataInputStream in = new DataInputStream(buf);
    DelegationTokenIdentifier id = new DelegationTokenIdentifier();
    id.readFields(in);
    if (context != null) {
      final NameNode nn = NameNodeHttpServer.getNameNodeFromContext(context);
      if (nn != null) {
        // Verify the token.
        nn.getNamesystem().verifyToken(id, token.getPassword());
      }
    }
    UserGroupInformation ugi = id.getUser();
    ugi.addToken(token);
    return ugi;

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