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.

      final long size = lb.getBlockSize();
      if (i < numblock - 1) {
        assertEquals(BLOCK_SIZE, size);
      }
      for(DatanodeInfo datanodeinfo : lb.getLocations()) {
        final DataNode dn = cluster.getDataNode(datanodeinfo.getIpcPort());
        final BlockMetaDataInfo metainfo = dn.getBlockMetaDataInfo(blk);
        assertEquals(size, metainfo.getNumBytes());
      }
    }
  }

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      }
      Configuration newconf = new Configuration(dnConf); // save config
      if (hosts != null) {
        NetUtils.addStaticResolution(hosts[i - curDatanodesNum], "localhost");
      }
      DataNode dn = DataNode.instantiateDataNode(dnArgs, dnConf);
      //since the HDFS does things based on IP:port, we need to add the mapping
      //for IP:port to rackId
      String ipAddr = dn.getSelfAddr().getAddress().getHostAddress();
      if (racks != null) {
        int port = dn.getSelfAddr().getPort();
        System.out.println("Adding node with IP:port : " + ipAddr + ":" + port+
                            " to rack " + racks[i-curDatanodesNum]);
        StaticMapping.addNodeToRack(ipAddr + ":" + port,
                                  racks[i-curDatanodesNum]);
      }

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   * Gets a list of the started DataNodes.  May be empty.
   */
  public ArrayList<DataNode> getDataNodes() {
    ArrayList<DataNode> list = new ArrayList<DataNode>();
    for (int i = 0; i < dataNodes.size(); i++) {
      DataNode node = dataNodes.get(i).datanode;
      list.add(node);
    }
    return list;
  }

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   * is left running so that new DataNodes may be started.
   */
  public void shutdownDataNodes() {
    for (int i = dataNodes.size()-1; i >= 0; i--) {
      System.out.println("Shutting down DataNode " + i);
      DataNode dn = dataNodes.remove(i).datanode;
      dn.shutdown();
      numDataNodes--;
    }
  }

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  DataNodeProperties stopDataNode(int i) {
    if (i < 0 || i >= dataNodes.size()) {
      return null;
    }
    DataNodeProperties dnprop = dataNodes.remove(i);
    DataNode dn = dnprop.datanode;
    System.out.println("MiniDFSCluster Stopping DataNode " + 
                       dn.dnRegistration.getName() +
                       " from a total of " + (dataNodes.size() + 1) + 
                       " datanodes.");
    dn.shutdown();
    numDataNodes--;
    return dnprop;
  }

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   * Shutdown a datanode by name.
   */
  public synchronized DataNodeProperties stopDataNode(String name) {
    int i;
    for (i = 0; i < dataNodes.size(); i++) {
      DataNode dn = dataNodes.get(i).datanode;
      if (dn.dnRegistration.getName().equals(name)) {
        break;
      }
    }
    return stopDataNode(i);

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    nni.updateAvatarConf(conf);
    startAvatarNode(nni, null);


    // Refresh datanodes with the newly started namenode
    for (DataNodeProperties dn : dataNodes) {
      DataNode datanode = dn.datanode;
      datanode.refreshNamenodes(conf);
    }
    // Wait for new namenode to get registrations from all the datanodes
    waitDataNodesActive(nnIndex);
    return nni;
  }

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  @Test
  public void testRefreshNamenodes() throws Exception {
    MiniAvatarCluster cluster = null;
    try {
      cluster = new MiniAvatarCluster(conf, 1, true, null, null, 1, true); 
      DataNode dn = cluster.getDataNodes().get(0);
      assertEquals(dn.getAllNamespaceServices().length, 1);
      
      cluster.addNameNode(conf);
      assertEquals(dn.getAllNamespaceServices().length, 2);
      
      cluster.addNameNode(conf);
      assertEquals(dn.getAllNamespaceServices().length, 3);
      
      cluster.addNameNode(conf);
      assertEquals(dn.getAllNamespaceServices().length, 4);
      int[] nns = null;
      nns = new int[]{0, 1, 2, 3};
      compareAddress(cluster, dn, nns);
      nns = new int[]{0, 1};
      Configuration conf1 = new Configuration(conf);
      setupAddress(conf1, new int[]{0, 1});
      dn.refreshNamenodes(conf1);
      waitDataNodeInitialized(dn);
      compareAddress(cluster, dn, nns);
      
      nns = new int[]{0,2,3};
      Configuration conf2 = new Configuration(conf);
      setupAddress(conf2, new int[]{0,2,3});
      dn.refreshNamenodes(conf2);
      waitDataNodeInitialized(dn);
      compareAddress(cluster, dn, nns);
    } finally {
      cluster.shutDown();
    }

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      }
      Configuration newconf = new Configuration(dnConf); // save config
      if (hosts != null) {
        NetUtils.addStaticResolution(hosts[i - curDatanodesNum], "localhost");
      }
      DataNode dn = DataNode.instantiateDataNode(dnArgs, dnConf);
      if(dn == null)
        throw new IOException("Cannot start DataNode in " +
          conf.get("dfs.data.dir"));
      //since the HDFS does things based on IP:port, we need to add the mapping
      //for IP:port to rackId
      String ipAddr = dn.getSelfAddr().getAddress().getHostAddress();
      if (racks != null) {
        int port = dn.getSelfAddr().getPort();
        System.out.println("Adding node with IP:port : " + ipAddr + ":" + port+
                            " to rack " + racks[i-curDatanodesNum]);
        StaticMapping.addNodeToRack(ipAddr + ":" + port,
                                  racks[i-curDatanodesNum]);
      }
      dn.runDatanodeDaemon();
      waitDataNodeInitialized(dn);
      dataNodes.add(new DataNodeProperties(dn, newconf, dnArgs));
    }
    curDatanodesNum += numDataNodes;
    this.numDataNodes += numDataNodes;

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   * Gets a list of the started DataNodes.  May be empty.
   */
  public ArrayList<DataNode> getDataNodes() {
    ArrayList<DataNode> list = new ArrayList<DataNode>();
    for (int i = 0; i < dataNodes.size(); i++) {
      DataNode node = dataNodes.get(i).datanode;
      list.add(node);
    }
    return list;
  }

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