Examples of org.apache.hadoop.hdfs.server.namenode.AvatarNode$InvalidatesCleaner

Package org.apache.hadoop.hdfs.server.namenode

Examples of org.apache.hadoop.hdfs.server.namenode.AvatarNode$InvalidatesCleaner

org.apache.hadoop.hdfs.server.namenode.AvatarNode
This is an implementation of the AvatarNode, a hot standby for the NameNode. This is really cool, believe me! The AvatarNode has two avatars.. the Standby avatar and the Active avatar. In the Standby avatar, the AvatarNode is consuming transaction logs generated by the primary (via a transaction log stored in a shared device). Typically, the primary Namenode is writing transactions to a NFS filesystem and the Standby is reading the log from the same NFS filesystem. The Standby is also making periodic checkpoints to the primary namenode. A manual command can switch the AvatarNode from the Standby avatar to the Active avatar. In the Active avatar, the AvatarNode performs precisely the same functionality as a real usual Namenode. The switching from Standby avatar to the Active avatar is fast and can typically occur within seconds. Typically, an adminstrator will run require two shared mount points for transaction logs. It has to be set in fs.name.dir.shared0 and fs.name.dir.shared1 (similarly for edits). Then the adminstrator starts the AvatarNode on two different machines as follows: bin/hadoop org.apache.hadoop.hdfs.server.namenode.AvatarNode -zero -active bin/hadoop org.apache.hadoop.hdfs.server.namenode.AvatarNode -one -standby The first AvatarNode uses fs.name.dir.shared0 while the second AvatarNode uses fs.name.dir.shared1 to write its transaction logs. Also, at startup, the first instance is the primary Namenode and the second instance is the Standby After a while, the adminstrator decides to change the avatar of the second instance to Active. In this case, he/she has to first ensure that the first instance is really really dead. This code does not handle the split-brain scenario where there are two active namenodes in one cluster.

        argList.add(StartupOption.SERVICE.getName());
        argList.add(nni.nameserviceId);
      }
      a0Args = new String[argList.size()];
      argList.toArray(a0Args);
      AvatarNode a0 = AvatarNode.
        createAvatarNode(a0Args, 
                         getServerConf(AvatarConstants.
                                       StartupOption.
                                       NODEZERO.
                                       getName(), nni));


      avatars.add(new AvatarInfo(a0,
                                 AvatarState.ACTIVE,
                                 nni.nn0Port, nni.nnDn0Port, nni.http0Port, nni.rpc0Port,
                                 AvatarConstants.StartupOption.NODEZERO.
                                 getName()));
      
      // wait for up to 10 seconds until the ACTIVE is initialized
      for (int i = 0; i < 10; i++) {
        if (a0.isInitialized())
          break;
        LOG.info("Waiting for the ACTIVE to be initialized...");
        try {
          Thread.sleep(1000);
        } catch (InterruptedException e) {
          throw new IOException(
              "Received interruption when initializing ACTIVE node");
        }
      }
      if (!a0.isInitialized()) {
        throw new IOException("The ACTIVE cannot be initialized");
      }
    }


    {

View Full Code Here

  public void testAvatarShellLeaveSafeMode() throws Exception {
    setUp(false);
    int blocksBefore = blocksInFile();


    AvatarShell shell = new AvatarShell(conf);
    AvatarNode primaryAvatar = cluster.getPrimaryAvatar(0).avatar;
    primaryAvatar.setSafeMode(SafeModeAction.SAFEMODE_ENTER);
    assertTrue(primaryAvatar.isInSafeMode());
    assertEquals(0, shell.run(new String[] { "-zero", "-leaveSafeMode" }));
    assertFalse(primaryAvatar.isInSafeMode());
    assertFalse(cluster.getPrimaryAvatar(0).avatar.isInSafeMode());
    int blocksAfter = blocksInFile();
    assertTrue(blocksBefore == blocksAfter);


  }

View Full Code Here

    int blocksBefore = blocksInFile();
    cluster.failOver();
    cluster.restartStandby();


    AvatarShell shell = new AvatarShell(conf);
    AvatarNode primaryAvatar = cluster.getPrimaryAvatar(0).avatar;
    primaryAvatar.setSafeMode(SafeModeAction.SAFEMODE_ENTER);
    assertTrue(primaryAvatar.isInSafeMode());
    assertEquals(0, shell.run(new String[] { "-one", "-leaveSafeMode" }));
    assertFalse(primaryAvatar.isInSafeMode());
    assertFalse(cluster.getPrimaryAvatar(0).avatar.isInSafeMode());
    int blocksAfter = blocksInFile();
    assertTrue(blocksBefore == blocksAfter);
  }

View Full Code Here

    // fail once
    TestAvatarCheckpointingHandler h = new TestAvatarCheckpointingHandler(null, true);
    InjectionHandler.set(h);
    setUp();
    createEdits(20);
    AvatarNode primary = cluster.getPrimaryAvatar(0).avatar;
    AvatarNode standby = cluster.getStandbyAvatar(0).avatar;
    
    
    try {
      Thread.sleep(3000);
      h.failNextCheckpoint = true;
      standby.doCheckpoint();
      fail("Should get IOException here");
    } catch (Exception e) {  }
    
    // checkpoint failed
    assertNotNull(h.lastSignature);
    
    h.failNextCheckpoint = false;
    standby.doCheckpoint();
    // checkpoint succeeded
    assertNull(h.lastSignature);
    
    h.failNextCheckpoint = true;
    try {
      standby.doCheckpoint();
      fail("Should get IOException here");
    } catch (Exception e) {  }
    // checkpoint failed -> now reading edits.new
    
    
    assertNotNull(h.lastSignature);  
    createEdits(20);
    standby.quiesceStandby(getCurrentTxId(primary)-1);
    assertEquals(40, getCurrentTxId(primary));
    assertEquals(getCurrentTxId(primary), getCurrentTxId(standby));
  }

View Full Code Here

    LOG.info("TEST: ----> testFailCheckpointMultiAndCrash");
    TestAvatarCheckpointingHandler h = new TestAvatarCheckpointingHandler(null, true);
    InjectionHandler.set(h);
    setUp();
    createEdits(20);
    AvatarNode standby = cluster.getStandbyAvatar(0).avatar;
    
    try {
      Thread.sleep(3000);
      h.failNextCheckpoint = true;
      standby.doCheckpoint();
      fail("Should get IOException here");
    } catch (IOException e) {  }
    // checkpoint did not succeed
    assertNotNull(h.lastSignature);
    
    try {
      standby.doCheckpoint();
      fail("Should get IOException here");
    } catch (IOException e) {  }
    // checkpoint did not succeed
    assertNotNull(h.lastSignature);
    
    try {
      h.alterSignature = true;
      standby.doCheckpoint();
      fail("Checkpoint should not succeed and throw RuntimeException");
    } catch (Exception e) {
      LOG.info("Expected exception : " + e.toString());
    }
  }

View Full Code Here

    LOG.info("TEST: ----> testFailCheckpointOnceAndRestartStandby");
    TestAvatarCheckpointingHandler h = new TestAvatarCheckpointingHandler(null, true);
    InjectionHandler.set(h);
    setUp();
    createEdits(20);
    AvatarNode primary = cluster.getPrimaryAvatar(0).avatar;
    AvatarNode standby = cluster.getStandbyAvatar(0).avatar;
    
    try {
      Thread.sleep(3000);
      h.failNextCheckpoint = true;
      standby.doCheckpoint();
      fail("Should get IOException here");
    } catch (IOException e) {  }
    // checkpoint failed
    assertNotNull(h.lastSignature);
    
    cluster.killStandby(0);
    cluster.restartStandby(0);
    Thread.sleep(2000);
    
    standby = cluster.getStandbyAvatar(0).avatar;
    h.failNextCheckpoint = false;
     
    standby.doCheckpoint();
    // checkpoint succeeded
    assertNull(h.lastSignature);
    
    createEdits(20);
    standby.quiesceStandby(getCurrentTxId(primary)-1);
    assertEquals(40, getCurrentTxId(primary));
    assertEquals(getCurrentTxId(primary), getCurrentTxId(standby));
  }

View Full Code Here

    h.simulateEditsNotExists = true;
    
    InjectionHandler.set(h);
    setUp();
    createEdits(20);
    AvatarNode primary = cluster.getPrimaryAvatar(0).avatar;
    AvatarNode standby = cluster.getStandbyAvatar(0).avatar;
    
    Thread.sleep(3000);
    standby.doCheckpoint();
    assertTrue(h.ingestRecreatedAfterFailure);
    h.simulateEditsNotExists = false;
    
    createEdits(20);
    standby.quiesceStandby(getCurrentTxId(primary)-1);
    assertEquals(40, getCurrentTxId(primary));
    assertEquals(getCurrentTxId(primary), getCurrentTxId(standby));
  }

View Full Code Here

        null, false);
    h.corruptImage = true;
    InjectionHandler.set(h);
    setUp();
    createEdits(20);
    AvatarNode standby = cluster.getStandbyAvatar(0).avatar;
    
    try {
      standby.doCheckpoint();
      fail("Should get IOException here");
    } catch (IOException e) {  }
  }

View Full Code Here

  private void testQuiesceInterruption(InjectionEvent event, boolean scf) throws Exception {
    LOG.info("TEST Quiesce during checkpoint : " + event);
    TestAvatarCheckpointingHandler h = new TestAvatarCheckpointingHandler(event, scf);
    InjectionHandler.set(h);
    setUp(3); //simulate interruption, no ckpt failure   
    AvatarNode primary = cluster.getPrimaryAvatar(0).avatar;
    AvatarNode standby = cluster.getStandbyAvatar(0).avatar;
    
    createEdits(40);
    try {
      Thread.sleep(6000);
    } catch (Exception e) { }


    standby.quiesceStandby(getCurrentTxId(primary)-1);
    assertEquals(40, getCurrentTxId(primary));
    assertEquals(getCurrentTxId(primary), getCurrentTxId(standby));
    tearDown();
  }

View Full Code Here

      fs.create(new Path("/" + random.nextInt()));
    }
  }


  private ZookeeperTxId getLastTxid() throws Exception {
    AvatarNode primaryAvatar = cluster.getPrimaryAvatar(0).avatar;
    String address = AvatarNode.getClusterAddress(primaryAvatar
        .getStartupConf());
    return zkClient.getPrimaryLastTxId(address);
  }

View Full Code Here

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org.apache.hadoop.conf.Configuration

org.apache.hadoop.fs.FileSystem

org.apache.hadoop.fs.Path

org.apache.hadoop.hdfs.AvatarFailoverSnapshot

org.apache.hadoop.hdfs.AvatarZooKeeperClient

org.apache.hadoop.hdfs.FailoverTestUtil

org.apache.hadoop.hdfs.FileStatusExtended

org.apache.hadoop.hdfs.MiniAvatarCluster

org.apache.hadoop.hdfs.protocol.AvatarConstants.InstanceId

org.apache.hadoop.hdfs.protocol.AvatarConstants.StartupOption

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