Examples of org.apache.hadoop.hdfs.server.datanode.DataNode

Package org.apache.hadoop.hdfs.server.datanode

Examples of org.apache.hadoop.hdfs.server.datanode.DataNode

org.apache.hadoop.hdfs.server.datanode.DataNode
DataNode is a class (and program) that stores a set of blocks for a DFS deployment. A single deployment can have one or many DataNodes. Each DataNode communicates regularly with a single NameNode. It also communicates with client code and other DataNodes from time to time. DataNodes store a series of named blocks. The DataNode allows client code to read these blocks, or to write new block data. The DataNode may also, in response to instructions from its NameNode, delete blocks or copy blocks to/from other DataNodes. The DataNode maintains just one critical table: block-> stream of bytes (of BLOCK_SIZE or less) This info is stored on a local disk. The DataNode reports the table's contents to the NameNode upon startup and every so often afterwards. DataNodes spend their lives in an endless loop of asking the NameNode for something to do. A NameNode cannot connect to a DataNode directly; a NameNode simply returns values from functions invoked by a DataNode. DataNodes maintain an open server socket so that client code or other DataNodes can read/write data. The host/port for this server is reported to the NameNode, which then sends that information to clients or other DataNodes that might be interested.

    List<File> files = new ArrayList<File>();
    List<DataNode> datanodes = cluster.getDataNodes();
    String poolId = cluster.getNamesystem().getBlockPoolId();
    List<Map<DatanodeStorage, BlockListAsLongs>> blocks = cluster.getAllBlockReports(poolId);
    for(int i = 0; i < blocks.size(); i++) {
      DataNode dn = datanodes.get(i);
      Map<DatanodeStorage, BlockListAsLongs> map = blocks.get(i);
      for(Map.Entry<DatanodeStorage, BlockListAsLongs> e : map.entrySet()) {
        for(Block b : e.getValue()) {
          files.add(DataNodeTestUtils.getFile(dn, poolId, b.getBlockId()));
        }

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    //clear content type
    response.setContentType(null);
    
    if (UserGroupInformation.isSecurityEnabled()) {
      //add a token for RPC.
      final DataNode datanode = (DataNode)context.getAttribute("datanode");
      final InetSocketAddress nnRpcAddr = NameNode.getAddress(datanode.getConf());
      final Token<DelegationTokenIdentifier> token = new Token<DelegationTokenIdentifier>();
      token.decodeFromUrlString(delegation.getValue());
      SecurityUtil.setTokenService(token, nnRpcAddr);
      token.setKind(DelegationTokenIdentifier.HDFS_DELEGATION_KIND);
      ugi.addToken(token);

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    return ugi.doAs(new PrivilegedExceptionAction<Response>() {
      @Override
      public Response run() throws IOException, URISyntaxException {


    final String fullpath = path.getAbsolutePath();
    final DataNode datanode = (DataNode)context.getAttribute("datanode");


    switch(op.getValue()) {
    case CREATE:
    {
      final Configuration conf = new Configuration(datanode.getConf());
      conf.set(FsPermission.UMASK_LABEL, "000");


      final int b = bufferSize.getValue(conf);
      DFSClient dfsclient = new DFSClient(conf);
      FSDataOutputStream out = null;

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    return ugi.doAs(new PrivilegedExceptionAction<Response>() {
      @Override
      public Response run() throws IOException {


    final String fullpath = path.getAbsolutePath();
    final DataNode datanode = (DataNode)context.getAttribute("datanode");


    switch(op.getValue()) {
    case APPEND:
    {
      final Configuration conf = new Configuration(datanode.getConf());
      final int b = bufferSize.getValue(conf);
      DFSClient dfsclient = new DFSClient(conf);
      FSDataOutputStream out = null;
      try {
        out = dfsclient.append(fullpath, b, null, null);

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    return ugi.doAs(new PrivilegedExceptionAction<Response>() {
      @Override
      public Response run() throws IOException {


    final String fullpath = path.getAbsolutePath();
    final DataNode datanode = (DataNode)context.getAttribute("datanode");
    final Configuration conf = new Configuration(datanode.getConf());
    final InetSocketAddress nnRpcAddr = NameNode.getAddress(conf);


    switch(op.getValue()) {
    case OPEN:
    {

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      byte[] writeBuf = new byte[fileLen];
      new Random().nextBytes(writeBuf);
      out = fs.create(src);
      out.write(writeBuf);
      out.hflush();
      DataNode dn = cluster.getDataNodes().get(0);
      for (FsVolumeSpi v : dataset(dn).getVolumes()) {
        final FsVolumeImpl volume = (FsVolumeImpl)v;
        File currentDir = volume.getCurrentDir().getParentFile().getParentFile();
        File rbwDir = new File(currentDir, "rbw");
        for (File file : rbwDir.listFiles()) {

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        Path fileName = new Path("/test"+i);
        DFSTestUtil.createFile(fs, fileName, 1, (short)1, 0L);
        DFSTestUtil.waitReplication(fs, fileName, (short)1);
      }
      String bpid = cluster.getNamesystem().getBlockPoolId();
      DataNode dn = cluster.getDataNodes().get(0);
      Iterator<ReplicaInfo> replicasItor = 
          dataset(dn).volumeMap.replicas(bpid).iterator();
      ReplicaInfo replica = replicasItor.next();
      createUnlinkTmpFile(replica, true, true); // rename block file
      createUnlinkTmpFile(replica, false, true); // rename meta file

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      fs = cluster.getFileSystem();
      final FSNamesystem namesystem = cluster.getNamesystem();


      conf.setLong(DFSConfigKeys.DFS_HEARTBEAT_INTERVAL_KEY, 300);
      cluster.startDataNodes(conf, 1, true, null, null, null);
      DataNode lastDN = cluster.getDataNodes().get(3);
      DatanodeRegistration dnReg = DataNodeTestUtils.getDNRegistrationForBP(
          lastDN, namesystem.getBlockPoolId());
      String lastDNid = dnReg.getStorageID();


      final Path fileName = new Path("/foo2");

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      out.hsync();
      cluster.startDataNodes(conf, 1, true, null, null, null);
      String bpid = namesystem.getBlockPoolId();
      ExtendedBlock blk = DFSTestUtil.getFirstBlock(fs, testPath);
      Block block = blk.getLocalBlock();
      DataNode dn = cluster.getDataNodes().get(0);


      // Delete partial block and its meta information from the RBW folder
      // of first datanode.
      File blockFile = DataNodeTestUtils.getBlockFile(dn, bpid, block);
      File metaFile = DataNodeTestUtils.getMetaFile(dn, bpid, block);

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    List<File> files = new ArrayList<File>();
    List<DataNode> datanodes = cluster.getDataNodes();
    String poolId = cluster.getNamesystem().getBlockPoolId();
    Iterable<Block>[] blocks = cluster.getAllBlockReports(poolId);
    for(int i = 0; i < blocks.length; i++) {
      DataNode dn = datanodes.get(i);
      for(Block b : blocks[i]) {
        files.add(DataNodeTestUtils.getFile(dn, poolId, b.getBlockId()));
      }        
    }
    return files;

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