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 {
      createFile(fs1, "/testAppendFileRace", 1, BBW_SIZE);
      stm.close();


      NameNode nn = cluster.getNameNode();
      FSEditLog editLogSpy = FSImageAdapter.injectEditLogSpy(nn.getNamesystem());
      DelayAnswer  delayer = new DelayAnswer();
      doAnswer(delayer).when(editLogSpy).logSync();


      final AtomicReference<Throwable> err = new AtomicReference<Throwable>();
      Thread appender = new Thread() {

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      // write 1/2 block & close
      stm = fs1.create(file1, true, (int)BLOCK_SIZE*2, rep, BLOCK_SIZE);
      AppendTestUtil.write(stm, 0, halfBlock);
      stm.close();


      NameNode nn = cluster.getNameNode();
      LOG.info("======== Appending");
      stm = fs1.append(file1);
      LOG.info("======== Writing");
      AppendTestUtil.write(stm, 0, halfBlock/2);
      LOG.info("======== Checking progress");

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      // write 1/2 block & close
      stm = fs1.create(file1, true, (int)BLOCK_SIZE*2, rep, BLOCK_SIZE);
      AppendTestUtil.write(stm, 0, halfBlock);
      stm.close();


      NameNode nn = cluster.getNameNode();
      LOG.info("======== Appending");
      stm = fs1.append(file1);
      LOG.info("======== Writing");
      AppendTestUtil.write(stm, 0, halfBlock/4);

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   * with no .append() called.
   */
  public void testNotPrematurelyCompleteWithFailureNotReopened() throws Exception {
    LOG.info("START");
    cluster = new MiniDFSCluster(conf, 3, true, null);
    NameNode nn = cluster.getNameNode();
    FileSystem fs1 = cluster.getFileSystem();
    try {
      short rep = 3; // replication


      file1 = new Path("/delayedReceiveBlock");

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      loseLeases(fs1);


      // Make the first nextGenerationStamp call get delayed
      DelayAnswer delayer = new DelayAnswer(false);


      NameNode nn = cluster.getNameNode();
      nn.namesystem = spy(nn.namesystem);
      NameNodeAdapter.callNextGenerationStampForBlock(
        doAnswer(delayer).when(nn.namesystem),
        (Block)anyObject(), anyBoolean());

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    assertTrue(maxBlockAcquires > 0);


    try {
      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)1, 12345L /*seed*/);


      // If the client will retry maxBlockAcquires times, then if we fail

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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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    assertEquals(0, runTool("-getServiceState", "nn1"));
  }
    
  @Test 
  public void testStateTransition() throws Exception {
    NameNode nnode1 = cluster.getNameNode(0);
    assertTrue(nnode1.isStandbyState());
    assertEquals(0, runTool("-transitionToActive", "nn1"));
    assertFalse(nnode1.isStandbyState());       
    assertEquals(0, runTool("-transitionToStandby", "nn1"));
    assertTrue(nnode1.isStandbyState());
    
    NameNode nnode2 = cluster.getNameNode(1);
    assertTrue(nnode2.isStandbyState());
    assertEquals(0, runTool("-transitionToActive", "nn2"));
    assertFalse(nnode2.isStandbyState());
    assertEquals(0, runTool("-transitionToStandby", "nn2"));
    assertTrue(nnode2.isStandbyState());
  }

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


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


      // set a short token lifetime (1 second)
      SecurityTestUtil.setBlockTokenLifetime(sm, 1000L);
      Path fileToAppend = new Path(FILE_TO_APPEND);

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


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


      // set a short token lifetime (1 second)
      SecurityTestUtil.setBlockTokenLifetime(sm, 1000L);
      Path fileToWrite = new Path(FILE_TO_WRITE);

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