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.

      // 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());

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    // make sure JT starts
    jConf = mrCluster.createJobConf();
    
    // provide namenodes names for the job to get the delegation tokens for
    //String nnUri = dfsCluster.getNameNode().getUri(namenode).toString();
    NameNode nn = dfsCluster.getNameNode();
    URI nnUri = NameNode.getUri(nn.getNameNodeAddress());
    jConf.set(JobContext.JOB_NAMENODES, nnUri + "," + nnUri.toString());
    // job tracker principle id..
    jConf.set(JobTracker.JT_USER_NAME, "jt_id");


    // using argument to pass the file name

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    // Start a second DN for this test -- we're checking
    // what happens when one of the DNs is slowed for some reason.
    REPL_FACTOR = 2;
    startDNandWait(null, false);


    NameNode nn = cluster.getNameNode();


    FSDataOutputStream out = fs.create(filePath, REPL_FACTOR);
    try {
      AppendTestUtil.write(out, 0, 10);
      out.hflush();


      // Set up a spy so that we can delay the block report coming
      // from this node.
      DataNode dn = cluster.getDataNodes().get(0);
      DatanodeProtocolClientSideTranslatorPB spy =
        DataNodeTestUtils.spyOnBposToNN(dn, nn);


      Mockito.doAnswer(delayer)
        .when(spy).blockReport(
          Mockito.<DatanodeRegistration>anyObject(),
          Mockito.anyString(),
          Mockito.<StorageBlockReport[]>anyObject());


      // Force a block report to be generated. The block report will have
      // an RBW replica in it. Wait for the RPC to be sent, but block
      // it before it gets to the NN.
      dn.scheduleAllBlockReport(0);
      delayer.waitForCall();


    } finally {
      IOUtils.closeStream(out);
    }


    // Now that the stream is closed, the NN will have the block in COMPLETE
    // state.
    delayer.proceed();
    brFinished.await();


    // Verify that no replicas are marked corrupt, and that the
    // file is still readable.
    BlockManagerTestUtil.updateState(nn.getNamesystem().getBlockManager());
    assertEquals(0, nn.getNamesystem().getCorruptReplicaBlocks());
    DFSTestUtil.readFile(fs, filePath);


    // Ensure that the file is readable even from the DN that we futzed with.
    cluster.stopDataNode(1);
    DFSTestUtil.readFile(fs, filePath);

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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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   * @throws Exception
   */
  @Test
  public void testTransitionToActiveWhenOtherNamenodeisActive() 
      throws Exception {
    NameNode nn1 = cluster.getNameNode(0);
    NameNode nn2 = cluster.getNameNode(1);
    if(nn1.getState() != null && !nn1.getState().
        equals(HAServiceState.STANDBY.name()) ) {
      cluster.transitionToStandby(0);
    }
    if(nn2.getState() != null && !nn2.getState().
        equals(HAServiceState.STANDBY.name()) ) {
      cluster.transitionToStandby(1);
    }
    //Making sure both the namenode are in standby state
    assertTrue(nn1.isStandbyState());
    assertTrue(nn2.isStandbyState());
    // Triggering the transition for both namenode to Active
    runTool("-transitionToActive", "nn1");
    runTool("-transitionToActive", "nn2");


    assertFalse("Both namenodes cannot be active", nn1.isActiveState() 
        && nn2.isActiveState());
   
    /*  This test case doesn't allow nn2 to transition to Active even with
        forceActive switch since nn1 is already active  */
    if(nn1.getState() != null && !nn1.getState().
        equals(HAServiceState.STANDBY.name()) ) {
      cluster.transitionToStandby(0);
    }
    if(nn2.getState() != null && !nn2.getState().
        equals(HAServiceState.STANDBY.name()) ) {
      cluster.transitionToStandby(1);
    }
    //Making sure both the namenode are in standby state
    assertTrue(nn1.isStandbyState());
    assertTrue(nn2.isStandbyState());
    
    runTool("-transitionToActive", "nn1");
    runTool("-transitionToActive", "nn2","--forceactive");
    
    assertFalse("Both namenodes cannot be active even though with forceActive",
        nn1.isActiveState() && nn2.isActiveState());


    /*  In this test case, we have deliberately shut down nn1 and this will
        cause HAAAdmin#isOtherTargetNodeActive to throw an Exception 
        and transitionToActive for nn2 with  forceActive switch will succeed 
        even with Exception  */
    cluster.shutdownNameNode(0);
    if(nn2.getState() != null && !nn2.getState().
        equals(HAServiceState.STANDBY.name()) ) {
      cluster.transitionToStandby(1);
    }
    //Making sure both the namenode (nn2) is in standby state
    assertTrue(nn2.isStandbyState());
    assertFalse(cluster.isNameNodeUp(0));
    
    runTool("-transitionToActive", "nn2", "--forceactive");
    assertTrue("Namenode nn2 should be active", nn2.isActiveState());
  }

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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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