Java Code Examples for org.apache.hadoop.hdfs.DFSTestUtil#waitForReplication()

The following examples show how to use org.apache.hadoop.hdfs.DFSTestUtil#waitForReplication() . You can vote up the ones you like or vote down the ones you don't like, and go to the original project or source file by following the links above each example. You may check out the related API usage on the sidebar.
Example 1
Source File: TestBlocksWithNotEnoughRacks.java    From hadoop with Apache License 2.0 6 votes vote down vote up 
@Test
public void testSufficientlySingleReplBlockUsesNewRack() throws Exception {
  Configuration conf = getConf();
  short REPLICATION_FACTOR = 1;
  final Path filePath = new Path("/testFile");

  String racks[] = {"/rack1", "/rack1", "/rack1", "/rack2"};
  MiniDFSCluster cluster = new MiniDFSCluster.Builder(conf)
    .numDataNodes(racks.length).racks(racks).build();
  final FSNamesystem ns = cluster.getNameNode().getNamesystem();

  try {
    // Create a file with one block with a replication factor of 1
    final FileSystem fs = cluster.getFileSystem();
    DFSTestUtil.createFile(fs, filePath, 1L, REPLICATION_FACTOR, 1L);
    ExtendedBlock b = DFSTestUtil.getFirstBlock(fs, filePath);
    DFSTestUtil.waitForReplication(cluster, b, 1, REPLICATION_FACTOR, 0);

    REPLICATION_FACTOR = 2;
    NameNodeAdapter.setReplication(ns, "/testFile", REPLICATION_FACTOR);
    DFSTestUtil.waitForReplication(cluster, b, 2, REPLICATION_FACTOR, 0);
  } finally {
    cluster.shutdown();
  }
}
Example 2
Source File: TestBlocksWithNotEnoughRacks.java    From big-c with Apache License 2.0 6 votes vote down vote up 
@Test
public void testSufficientlySingleReplBlockUsesNewRack() throws Exception {
  Configuration conf = getConf();
  short REPLICATION_FACTOR = 1;
  final Path filePath = new Path("/testFile");

  String racks[] = {"/rack1", "/rack1", "/rack1", "/rack2"};
  MiniDFSCluster cluster = new MiniDFSCluster.Builder(conf)
    .numDataNodes(racks.length).racks(racks).build();
  final FSNamesystem ns = cluster.getNameNode().getNamesystem();

  try {
    // Create a file with one block with a replication factor of 1
    final FileSystem fs = cluster.getFileSystem();
    DFSTestUtil.createFile(fs, filePath, 1L, REPLICATION_FACTOR, 1L);
    ExtendedBlock b = DFSTestUtil.getFirstBlock(fs, filePath);
    DFSTestUtil.waitForReplication(cluster, b, 1, REPLICATION_FACTOR, 0);

    REPLICATION_FACTOR = 2;
    NameNodeAdapter.setReplication(ns, "/testFile", REPLICATION_FACTOR);
    DFSTestUtil.waitForReplication(cluster, b, 2, REPLICATION_FACTOR, 0);
  } finally {
    cluster.shutdown();
  }
}
Example 3
Source File: TestBlocksWithNotEnoughRacks.java    From hadoop with Apache License 2.0 5 votes vote down vote up 
@Test
public void testSufficientlyReplBlocksUsesNewRack() throws Exception {
  Configuration conf = getConf();
  final short REPLICATION_FACTOR = 3;
  final Path filePath = new Path("/testFile");
  // All datanodes are on the same rack
  String racks[] = {"/rack1", "/rack1", "/rack1"};
  MiniDFSCluster cluster = new MiniDFSCluster.Builder(conf)
    .numDataNodes(racks.length).racks(racks).build();

  try {
    // Create a file with one block with a replication factor of 3
    final FileSystem fs = cluster.getFileSystem();
    DFSTestUtil.createFile(fs, filePath, 1L, REPLICATION_FACTOR, 1L);
    ExtendedBlock b = DFSTestUtil.getFirstBlock(fs, filePath);
    DFSTestUtil.waitForReplication(cluster, b, 1, REPLICATION_FACTOR, 0);

    // Add a new datanode on a different rack
    String newRacks[] = {"/rack2"};
    cluster.startDataNodes(conf, 1, true, null, newRacks);
    cluster.waitActive();

    DFSTestUtil.waitForReplication(cluster, b, 2, REPLICATION_FACTOR, 0);
  } finally {
    cluster.shutdown();
  }
}
Example 4
Source File: TestBlocksWithNotEnoughRacks.java    From big-c with Apache License 2.0 5 votes vote down vote up 
@Test
public void testReduceReplFactorRespectsRackPolicy() throws Exception {
  Configuration conf = getConf();
  short REPLICATION_FACTOR = 3;
  final Path filePath = new Path("/testFile");
  String racks[] = {"/rack1", "/rack1", "/rack2", "/rack2"};
  MiniDFSCluster cluster = new MiniDFSCluster.Builder(conf)
    .numDataNodes(racks.length).racks(racks).build();
  final FSNamesystem ns = cluster.getNameNode().getNamesystem();

  try {
    // Create a file with one block
    final FileSystem fs = cluster.getFileSystem();
    DFSTestUtil.createFile(fs, filePath, 1L, REPLICATION_FACTOR, 1L);
    ExtendedBlock b = DFSTestUtil.getFirstBlock(fs, filePath);
    DFSTestUtil.waitForReplication(cluster, b, 2, REPLICATION_FACTOR, 0);

    // Decrease the replication factor, make sure the deleted replica
    // was not the one that lived on the rack with only one replica,
    // ie we should still have 2 racks after reducing the repl factor.
    REPLICATION_FACTOR = 2;
    NameNodeAdapter.setReplication(ns, "/testFile", REPLICATION_FACTOR); 

    DFSTestUtil.waitForReplication(cluster, b, 2, REPLICATION_FACTOR, 0);
  } finally {
    cluster.shutdown();
  }
}
Example 5
Source File: TestBlocksWithNotEnoughRacks.java    From big-c with Apache License 2.0 5 votes vote down vote up 
@Test
public void testUnderReplicatedUsesNewRacks() throws Exception {
  Configuration conf = getConf();
  short REPLICATION_FACTOR = 3;
  final Path filePath = new Path("/testFile");
  // All datanodes are on the same rack
  String racks[] = {"/rack1", "/rack1", "/rack1", "/rack1", "/rack1"};
  MiniDFSCluster cluster = new MiniDFSCluster.Builder(conf)
    .numDataNodes(racks.length).racks(racks).build();
  final FSNamesystem ns = cluster.getNameNode().getNamesystem();

  try {
    // Create a file with one block
    final FileSystem fs = cluster.getFileSystem();
    DFSTestUtil.createFile(fs, filePath, 1L, REPLICATION_FACTOR, 1L);
    ExtendedBlock b = DFSTestUtil.getFirstBlock(fs, filePath);
    DFSTestUtil.waitForReplication(cluster, b, 1, REPLICATION_FACTOR, 0);
    
    // Add new datanodes on a different rack and increase the
    // replication factor so the block is underreplicated and make
    // sure at least one of the hosts on the new rack is used. 
    String newRacks[] = {"/rack2", "/rack2"};
    cluster.startDataNodes(conf, 2, true, null, newRacks);
    REPLICATION_FACTOR = 5;
    NameNodeAdapter.setReplication(ns, "/testFile", REPLICATION_FACTOR);

    DFSTestUtil.waitForReplication(cluster, b, 2, REPLICATION_FACTOR, 0);
  } finally {
    cluster.shutdown();
  }
}
Example 6
Source File: TestBlocksWithNotEnoughRacks.java    From big-c with Apache License 2.0 5 votes vote down vote up 
@Test
public void testSufficientlyReplBlocksUsesNewRack() throws Exception {
  Configuration conf = getConf();
  final short REPLICATION_FACTOR = 3;
  final Path filePath = new Path("/testFile");
  // All datanodes are on the same rack
  String racks[] = {"/rack1", "/rack1", "/rack1"};
  MiniDFSCluster cluster = new MiniDFSCluster.Builder(conf)
    .numDataNodes(racks.length).racks(racks).build();

  try {
    // Create a file with one block with a replication factor of 3
    final FileSystem fs = cluster.getFileSystem();
    DFSTestUtil.createFile(fs, filePath, 1L, REPLICATION_FACTOR, 1L);
    ExtendedBlock b = DFSTestUtil.getFirstBlock(fs, filePath);
    DFSTestUtil.waitForReplication(cluster, b, 1, REPLICATION_FACTOR, 0);

    // Add a new datanode on a different rack
    String newRacks[] = {"/rack2"};
    cluster.startDataNodes(conf, 1, true, null, newRacks);
    cluster.waitActive();

    DFSTestUtil.waitForReplication(cluster, b, 2, REPLICATION_FACTOR, 0);
  } finally {
    cluster.shutdown();
  }
}
Example 7
Source File: TestReadOnlySharedStorage.java    From hadoop with Apache License 2.0 5 votes vote down vote up 
/**
 * Verify that the NameNode is able to still use <tt>READ_ONLY_SHARED</tt> replicas even 
 * when the single NORMAL replica is offline (and the effective replication count is 0).
 */
@Test
public void testNormalReplicaOffline() throws Exception {
  // Stop the datanode hosting the NORMAL replica
  cluster.stopDataNode(normalDataNode.getXferAddr());
  
  // Force NameNode to detect that the datanode is down
  BlockManagerTestUtil.noticeDeadDatanode(
      cluster.getNameNode(), normalDataNode.getXferAddr());
  
  // The live replica count should now be zero (since the NORMAL replica is offline)
  NumberReplicas numberReplicas = blockManager.countNodes(block);
  assertThat(numberReplicas.liveReplicas(), is(0));
  
  // The block should be reported as under-replicated
  BlockManagerTestUtil.updateState(blockManager);
  assertThat(blockManager.getUnderReplicatedBlocksCount(), is(1L));
  
  // The BlockManager should be able to heal the replication count back to 1
  // by triggering an inter-datanode replication from one of the READ_ONLY_SHARED replicas
  BlockManagerTestUtil.computeAllPendingWork(blockManager);
  
  DFSTestUtil.waitForReplication(cluster, extendedBlock, 1, 1, 0);
  
  // There should now be 2 *locations* for the block, and 1 *replica*
  assertThat(getLocatedBlock().getLocations().length, is(2));
  validateNumberReplicas(1);
}
Example 8
Source File: TestBlocksWithNotEnoughRacks.java    From hadoop with Apache License 2.0 5 votes vote down vote up 
@Test
public void testReduceReplFactorRespectsRackPolicy() throws Exception {
  Configuration conf = getConf();
  short REPLICATION_FACTOR = 3;
  final Path filePath = new Path("/testFile");
  String racks[] = {"/rack1", "/rack1", "/rack2", "/rack2"};
  MiniDFSCluster cluster = new MiniDFSCluster.Builder(conf)
    .numDataNodes(racks.length).racks(racks).build();
  final FSNamesystem ns = cluster.getNameNode().getNamesystem();

  try {
    // Create a file with one block
    final FileSystem fs = cluster.getFileSystem();
    DFSTestUtil.createFile(fs, filePath, 1L, REPLICATION_FACTOR, 1L);
    ExtendedBlock b = DFSTestUtil.getFirstBlock(fs, filePath);
    DFSTestUtil.waitForReplication(cluster, b, 2, REPLICATION_FACTOR, 0);

    // Decrease the replication factor, make sure the deleted replica
    // was not the one that lived on the rack with only one replica,
    // ie we should still have 2 racks after reducing the repl factor.
    REPLICATION_FACTOR = 2;
    NameNodeAdapter.setReplication(ns, "/testFile", REPLICATION_FACTOR); 

    DFSTestUtil.waitForReplication(cluster, b, 2, REPLICATION_FACTOR, 0);
  } finally {
    cluster.shutdown();
  }
}
Example 9
Source File: TestBlocksWithNotEnoughRacks.java    From hadoop with Apache License 2.0 5 votes vote down vote up 
@Test
public void testUnderReplicatedUsesNewRacks() throws Exception {
  Configuration conf = getConf();
  short REPLICATION_FACTOR = 3;
  final Path filePath = new Path("/testFile");
  // All datanodes are on the same rack
  String racks[] = {"/rack1", "/rack1", "/rack1", "/rack1", "/rack1"};
  MiniDFSCluster cluster = new MiniDFSCluster.Builder(conf)
    .numDataNodes(racks.length).racks(racks).build();
  final FSNamesystem ns = cluster.getNameNode().getNamesystem();

  try {
    // Create a file with one block
    final FileSystem fs = cluster.getFileSystem();
    DFSTestUtil.createFile(fs, filePath, 1L, REPLICATION_FACTOR, 1L);
    ExtendedBlock b = DFSTestUtil.getFirstBlock(fs, filePath);
    DFSTestUtil.waitForReplication(cluster, b, 1, REPLICATION_FACTOR, 0);
    
    // Add new datanodes on a different rack and increase the
    // replication factor so the block is underreplicated and make
    // sure at least one of the hosts on the new rack is used. 
    String newRacks[] = {"/rack2", "/rack2"};
    cluster.startDataNodes(conf, 2, true, null, newRacks);
    REPLICATION_FACTOR = 5;
    NameNodeAdapter.setReplication(ns, "/testFile", REPLICATION_FACTOR);

    DFSTestUtil.waitForReplication(cluster, b, 2, REPLICATION_FACTOR, 0);
  } finally {
    cluster.shutdown();
  }
}
Example 10
Source File: TestBlocksWithNotEnoughRacks.java    From hadoop with Apache License 2.0 4 votes vote down vote up 
@Test
public void testReduceReplFactorDueToRejoinRespectsRackPolicy() 
    throws Exception {
  Configuration conf = getConf();
  short REPLICATION_FACTOR = 2;
  final Path filePath = new Path("/testFile");
  // Last datanode is on a different rack
  String racks[] = {"/rack1", "/rack1", "/rack2"};
  MiniDFSCluster cluster = new MiniDFSCluster.Builder(conf)
    .numDataNodes(racks.length).racks(racks).build();
  final FSNamesystem ns = cluster.getNameNode().getNamesystem();
  final DatanodeManager dm = ns.getBlockManager().getDatanodeManager();

  try {
    // Create a file with one block
    final FileSystem fs = cluster.getFileSystem();
    DFSTestUtil.createFile(fs, filePath, 1L, REPLICATION_FACTOR, 1L);
    ExtendedBlock b = DFSTestUtil.getFirstBlock(fs, filePath);
    DFSTestUtil.waitForReplication(cluster, b, 2, REPLICATION_FACTOR, 0);

    // Make the last (cross rack) datanode look like it failed
    // to heartbeat by stopping it and calling removeDatanode.
    ArrayList<DataNode> datanodes = cluster.getDataNodes();
    assertEquals(3, datanodes.size());
    DataNode dataNode = datanodes.get(2);
    DatanodeID dnId = dataNode.getDatanodeId();
    cluster.stopDataNode(2);
    dm.removeDatanode(dnId);

    // The block gets re-replicated to another datanode so it has a 
    // sufficient # replicas, but not across racks, so there should
    // be 1 rack, and 1 needed replica (even though there are 2 hosts 
    // available and only 2 replicas required).
    DFSTestUtil.waitForReplication(cluster, b, 1, REPLICATION_FACTOR, 1);

    // Start the "failed" datanode, which has a replica so the block is
    // now over-replicated and therefore a replica should be removed but
    // not on the restarted datanode as that would violate the rack policy.
    String rack2[] = {"/rack2"};
    cluster.startDataNodes(conf, 1, true, null, rack2);
    cluster.waitActive();      
    
    // The block now has sufficient # replicas, across racks
    DFSTestUtil.waitForReplication(cluster, b, 2, REPLICATION_FACTOR, 0);
  } finally {
    cluster.shutdown();
  }
}
Example 11
Source File: TestBlocksWithNotEnoughRacks.java    From hadoop with Apache License 2.0 4 votes vote down vote up 
@Test
public void testNodeDecomissionRespectsRackPolicy() throws Exception {
  Configuration conf = getConf();
  short REPLICATION_FACTOR = 2;
  final Path filePath = new Path("/testFile");

  // Configure an excludes file
  FileSystem localFileSys = FileSystem.getLocal(conf);
  Path workingDir = localFileSys.getWorkingDirectory();
  Path dir = new Path(workingDir, "build/test/data/temp/decommission");
  Path excludeFile = new Path(dir, "exclude");
  Path includeFile = new Path(dir, "include");
  assertTrue(localFileSys.mkdirs(dir));
  DFSTestUtil.writeFile(localFileSys, excludeFile, "");
  DFSTestUtil.writeFile(localFileSys, includeFile, "");
  conf.set(DFSConfigKeys.DFS_HOSTS_EXCLUDE, excludeFile.toUri().getPath());
  conf.set(DFSConfigKeys.DFS_HOSTS, includeFile.toUri().getPath());

  // Two blocks and four racks
  String racks[] = {"/rack1", "/rack1", "/rack2", "/rack2"};
  MiniDFSCluster cluster = new MiniDFSCluster.Builder(conf)
    .numDataNodes(racks.length).racks(racks).build();
  final FSNamesystem ns = cluster.getNameNode().getNamesystem();

  try {
    // Create a file with one block
    final FileSystem fs = cluster.getFileSystem();
    DFSTestUtil.createFile(fs, filePath, 1L, REPLICATION_FACTOR, 1L);
    ExtendedBlock b = DFSTestUtil.getFirstBlock(fs, filePath);
    DFSTestUtil.waitForReplication(cluster, b, 2, REPLICATION_FACTOR, 0);

    // Decommission one of the hosts with the block, this should cause 
    // the block to get replicated to another host on the same rack,
    // otherwise the rack policy is violated.
    BlockLocation locs[] = fs.getFileBlockLocations(
        fs.getFileStatus(filePath), 0, Long.MAX_VALUE);
    String name = locs[0].getNames()[0];
    DFSTestUtil.writeFile(localFileSys, excludeFile, name);
    ns.getBlockManager().getDatanodeManager().refreshNodes(conf);
    DFSTestUtil.waitForDecommission(fs, name);

    // Check the block still has sufficient # replicas across racks
    DFSTestUtil.waitForReplication(cluster, b, 2, REPLICATION_FACTOR, 0);
  } finally {
    cluster.shutdown();
  }
}
Example 12
Source File: TestBlocksWithNotEnoughRacks.java    From big-c with Apache License 2.0 4 votes vote down vote up 
@Test
public void testNodeDecomissionWithOverreplicationRespectsRackPolicy() 
    throws Exception {
  Configuration conf = getConf();
  short REPLICATION_FACTOR = 5;
  final Path filePath = new Path("/testFile");

  // Configure an excludes file
  FileSystem localFileSys = FileSystem.getLocal(conf);
  Path workingDir = localFileSys.getWorkingDirectory();
  Path dir = new Path(workingDir, "build/test/data/temp/decommission");
  Path excludeFile = new Path(dir, "exclude");
  Path includeFile = new Path(dir, "include");
  assertTrue(localFileSys.mkdirs(dir));
  DFSTestUtil.writeFile(localFileSys, excludeFile, "");
  DFSTestUtil.writeFile(localFileSys, includeFile, "");
  conf.set(DFSConfigKeys.DFS_HOSTS, includeFile.toUri().getPath());
  conf.set(DFSConfigKeys.DFS_HOSTS_EXCLUDE, excludeFile.toUri().getPath());

  // All hosts are on two racks, only one host on /rack2
  String racks[] = {"/rack1", "/rack2", "/rack1", "/rack1", "/rack1"};
  MiniDFSCluster cluster = new MiniDFSCluster.Builder(conf)
    .numDataNodes(racks.length).racks(racks).build();
  final FSNamesystem ns = cluster.getNameNode().getNamesystem();

  try {
    final FileSystem fs = cluster.getFileSystem();
    DFSTestUtil.createFile(fs, filePath, 1L, REPLICATION_FACTOR, 1L);
    ExtendedBlock b = DFSTestUtil.getFirstBlock(fs, filePath);
    DFSTestUtil.waitForReplication(cluster, b, 2, REPLICATION_FACTOR, 0);

    // Lower the replication factor so the blocks are over replicated
    REPLICATION_FACTOR = 2;
    fs.setReplication(filePath, REPLICATION_FACTOR);

    // Decommission one of the hosts with the block that is not on
    // the lone host on rack2 (if we decomission that host it would
    // be impossible to respect the rack policy).
    BlockLocation locs[] = fs.getFileBlockLocations(
        fs.getFileStatus(filePath), 0, Long.MAX_VALUE);
    for (String top : locs[0].getTopologyPaths()) {
      if (!top.startsWith("/rack2")) {
        String name = top.substring("/rack1".length()+1);
        DFSTestUtil.writeFile(localFileSys, excludeFile, name);
        ns.getBlockManager().getDatanodeManager().refreshNodes(conf);
        DFSTestUtil.waitForDecommission(fs, name);
        break;
      }
    }

    // Check the block still has sufficient # replicas across racks,
    // ie we didn't remove the replica on the host on /rack1.
    DFSTestUtil.waitForReplication(cluster, b, 2, REPLICATION_FACTOR, 0);
  } finally {
    cluster.shutdown();
  }
}
Example 13
Source File: TestBlocksWithNotEnoughRacks.java    From hadoop with Apache License 2.0 4 votes vote down vote up 
@Test
public void testReplDueToNodeFailRespectsRackPolicy() throws Exception {
  Configuration conf = getConf();
  short REPLICATION_FACTOR = 3;
  final Path filePath = new Path("/testFile");
  // Last datanode is on a different rack
  String racks[] = {"/rack1", "/rack1", "/rack1", "/rack2", "/rack2"};
  MiniDFSCluster cluster = new MiniDFSCluster.Builder(conf)
    .numDataNodes(racks.length).racks(racks).build();
  final FSNamesystem ns = cluster.getNameNode().getNamesystem();
  final DatanodeManager dm = ns.getBlockManager().getDatanodeManager();

  try {
    // Create a file with one block with a replication factor of 2
    final FileSystem fs = cluster.getFileSystem();
    DFSTestUtil.createFile(fs, filePath, 1L, REPLICATION_FACTOR, 1L);
    ExtendedBlock b = DFSTestUtil.getFirstBlock(fs, filePath);
    DFSTestUtil.waitForReplication(cluster, b, 2, REPLICATION_FACTOR, 0);

    // Make the last datanode look like it failed to heartbeat by 
    // calling removeDatanode and stopping it.
    ArrayList<DataNode> datanodes = cluster.getDataNodes();
    int idx = datanodes.size() - 1;
    DataNode dataNode = datanodes.get(idx);
    DatanodeID dnId = dataNode.getDatanodeId();
    cluster.stopDataNode(idx);
    dm.removeDatanode(dnId);

    // The block should still have sufficient # replicas, across racks.
    // The last node may not have contained a replica, but if it did
    // it should have been replicated within the same rack.
    DFSTestUtil.waitForReplication(cluster, b, 2, REPLICATION_FACTOR, 0);
    
    // Fail the last datanode again, it's also on rack2 so there is
    // only 1 rack for all the replicas
    datanodes = cluster.getDataNodes();
    idx = datanodes.size() - 1;
    dataNode = datanodes.get(idx);
    dnId = dataNode.getDatanodeId();
    cluster.stopDataNode(idx);
    dm.removeDatanode(dnId);

    // Make sure we have enough live replicas even though we are
    // short one rack and therefore need one replica
    DFSTestUtil.waitForReplication(cluster, b, 1, REPLICATION_FACTOR, 1);
  } finally {
    cluster.shutdown();
  }
}
Example 14
Source File: TestHostsFiles.java    From big-c with Apache License 2.0 4 votes vote down vote up 
@Test
public void testHostsExcludeInUI() throws Exception {
  Configuration conf = getConf();
  short REPLICATION_FACTOR = 2;
  final Path filePath = new Path("/testFile");

  // Configure an excludes file
  FileSystem localFileSys = FileSystem.getLocal(conf);
  Path workingDir = localFileSys.getWorkingDirectory();
  Path dir = new Path(workingDir, "build/test/data/temp/decommission");
  Path excludeFile = new Path(dir, "exclude");
  Path includeFile = new Path(dir, "include");
  assertTrue(localFileSys.mkdirs(dir));
  DFSTestUtil.writeFile(localFileSys, excludeFile, "");
  DFSTestUtil.writeFile(localFileSys, includeFile, "");
  conf.set(DFSConfigKeys.DFS_HOSTS_EXCLUDE, excludeFile.toUri().getPath());
  conf.set(DFSConfigKeys.DFS_HOSTS, includeFile.toUri().getPath());

  // Two blocks and four racks
  String racks[] = {"/rack1", "/rack1", "/rack2", "/rack2"};
  MiniDFSCluster cluster = new MiniDFSCluster.Builder(conf)
    .numDataNodes(racks.length).racks(racks).build();
  final FSNamesystem ns = cluster.getNameNode().getNamesystem();

  try {
    // Create a file with one block
    final FileSystem fs = cluster.getFileSystem();
    DFSTestUtil.createFile(fs, filePath, 1L, REPLICATION_FACTOR, 1L);
    ExtendedBlock b = DFSTestUtil.getFirstBlock(fs, filePath);
    DFSTestUtil.waitForReplication(cluster, b, 2, REPLICATION_FACTOR, 0);

    // Decommission one of the hosts with the block, this should cause 
    // the block to get replicated to another host on the same rack,
    // otherwise the rack policy is violated.
    BlockLocation locs[] = fs.getFileBlockLocations(
        fs.getFileStatus(filePath), 0, Long.MAX_VALUE);
    String name = locs[0].getNames()[0];
    String names = name + "\n" + "localhost:42\n";
    LOG.info("adding '" + names + "' to exclude file " + excludeFile.toUri().getPath());
    DFSTestUtil.writeFile(localFileSys, excludeFile, name);
    ns.getBlockManager().getDatanodeManager().refreshNodes(conf);
    DFSTestUtil.waitForDecommission(fs, name);

    // Check the block still has sufficient # replicas across racks
    DFSTestUtil.waitForReplication(cluster, b, 2, REPLICATION_FACTOR, 0);
    
    MBeanServer mbs = ManagementFactory.getPlatformMBeanServer();
    ObjectName mxbeanName =
        new ObjectName("Hadoop:service=NameNode,name=NameNodeInfo");
    String nodes = (String) mbs.getAttribute(mxbeanName, "LiveNodes");
    assertTrue("Live nodes should contain the decommissioned node",
        nodes.contains("Decommissioned"));
  } finally {
    cluster.shutdown();
  }
}
Example 15
Source File: TestBlocksWithNotEnoughRacks.java    From hadoop with Apache License 2.0 4 votes vote down vote up 
@Test
public void testCorruptBlockRereplicatedAcrossRacks() throws Exception {
  Configuration conf = getConf();
  short REPLICATION_FACTOR = 2;
  int fileLen = 512;
  final Path filePath = new Path("/testFile");
  // Datanodes are spread across two racks
  String racks[] = {"/rack1", "/rack1", "/rack2", "/rack2"};
  MiniDFSCluster cluster = new MiniDFSCluster.Builder(conf)
    .numDataNodes(racks.length).racks(racks).build();
  final FSNamesystem ns = cluster.getNameNode().getNamesystem();

  try {
    // Create a file with one block with a replication factor of 2
    final FileSystem fs = cluster.getFileSystem();
    
    DFSTestUtil.createFile(fs, filePath, fileLen, REPLICATION_FACTOR, 1L);
    final String fileContent = DFSTestUtil.readFile(fs, filePath);

    ExtendedBlock b = DFSTestUtil.getFirstBlock(fs, filePath);
    DFSTestUtil.waitForReplication(cluster, b, 2, REPLICATION_FACTOR, 0);

    // Corrupt a replica of the block
    int dnToCorrupt = DFSTestUtil.firstDnWithBlock(cluster, b);
    assertTrue(cluster.corruptReplica(dnToCorrupt, b));

    // Restart the datanode so blocks are re-scanned, and the corrupt
    // block is detected.
    cluster.restartDataNode(dnToCorrupt);

    // Wait for the namenode to notice the corrupt replica
    DFSTestUtil.waitCorruptReplicas(fs, ns, filePath, b, 1);

    // The rack policy is still respected
    DFSTestUtil.waitForReplication(cluster, b, 2, REPLICATION_FACTOR, 0);

    // Ensure all replicas are valid (the corrupt replica may not
    // have been cleaned up yet).
    for (int i = 0; i < racks.length; i++) {
      String blockContent = cluster.readBlockOnDataNode(i, b);
      if (blockContent != null && i != dnToCorrupt) {
        assertEquals("Corrupt replica", fileContent, blockContent);
      }
    }
  } finally {
    cluster.shutdown();
  }
}
Example 16
Source File: TestBlocksWithNotEnoughRacks.java    From big-c with Apache License 2.0 4 votes vote down vote up 
@Test
public void testCorruptBlockRereplicatedAcrossRacks() throws Exception {
  Configuration conf = getConf();
  short REPLICATION_FACTOR = 2;
  int fileLen = 512;
  final Path filePath = new Path("/testFile");
  // Datanodes are spread across two racks
  String racks[] = {"/rack1", "/rack1", "/rack2", "/rack2"};
  MiniDFSCluster cluster = new MiniDFSCluster.Builder(conf)
    .numDataNodes(racks.length).racks(racks).build();
  final FSNamesystem ns = cluster.getNameNode().getNamesystem();

  try {
    // Create a file with one block with a replication factor of 2
    final FileSystem fs = cluster.getFileSystem();
    
    DFSTestUtil.createFile(fs, filePath, fileLen, REPLICATION_FACTOR, 1L);
    final String fileContent = DFSTestUtil.readFile(fs, filePath);

    ExtendedBlock b = DFSTestUtil.getFirstBlock(fs, filePath);
    DFSTestUtil.waitForReplication(cluster, b, 2, REPLICATION_FACTOR, 0);

    // Corrupt a replica of the block
    int dnToCorrupt = DFSTestUtil.firstDnWithBlock(cluster, b);
    assertTrue(cluster.corruptReplica(dnToCorrupt, b));

    // Restart the datanode so blocks are re-scanned, and the corrupt
    // block is detected.
    cluster.restartDataNode(dnToCorrupt);

    // Wait for the namenode to notice the corrupt replica
    DFSTestUtil.waitCorruptReplicas(fs, ns, filePath, b, 1);

    // The rack policy is still respected
    DFSTestUtil.waitForReplication(cluster, b, 2, REPLICATION_FACTOR, 0);

    // Ensure all replicas are valid (the corrupt replica may not
    // have been cleaned up yet).
    for (int i = 0; i < racks.length; i++) {
      String blockContent = cluster.readBlockOnDataNode(i, b);
      if (blockContent != null && i != dnToCorrupt) {
        assertEquals("Corrupt replica", fileContent, blockContent);
      }
    }
  } finally {
    cluster.shutdown();
  }
}
Example 17
Source File: TestHostsFiles.java    From hadoop with Apache License 2.0 4 votes vote down vote up 
@Test
public void testHostsExcludeInUI() throws Exception {
  Configuration conf = getConf();
  short REPLICATION_FACTOR = 2;
  final Path filePath = new Path("/testFile");

  // Configure an excludes file
  FileSystem localFileSys = FileSystem.getLocal(conf);
  Path workingDir = localFileSys.getWorkingDirectory();
  Path dir = new Path(workingDir, "build/test/data/temp/decommission");
  Path excludeFile = new Path(dir, "exclude");
  Path includeFile = new Path(dir, "include");
  assertTrue(localFileSys.mkdirs(dir));
  DFSTestUtil.writeFile(localFileSys, excludeFile, "");
  DFSTestUtil.writeFile(localFileSys, includeFile, "");
  conf.set(DFSConfigKeys.DFS_HOSTS_EXCLUDE, excludeFile.toUri().getPath());
  conf.set(DFSConfigKeys.DFS_HOSTS, includeFile.toUri().getPath());

  // Two blocks and four racks
  String racks[] = {"/rack1", "/rack1", "/rack2", "/rack2"};
  MiniDFSCluster cluster = new MiniDFSCluster.Builder(conf)
    .numDataNodes(racks.length).racks(racks).build();
  final FSNamesystem ns = cluster.getNameNode().getNamesystem();

  try {
    // Create a file with one block
    final FileSystem fs = cluster.getFileSystem();
    DFSTestUtil.createFile(fs, filePath, 1L, REPLICATION_FACTOR, 1L);
    ExtendedBlock b = DFSTestUtil.getFirstBlock(fs, filePath);
    DFSTestUtil.waitForReplication(cluster, b, 2, REPLICATION_FACTOR, 0);

    // Decommission one of the hosts with the block, this should cause 
    // the block to get replicated to another host on the same rack,
    // otherwise the rack policy is violated.
    BlockLocation locs[] = fs.getFileBlockLocations(
        fs.getFileStatus(filePath), 0, Long.MAX_VALUE);
    String name = locs[0].getNames()[0];
    String names = name + "\n" + "localhost:42\n";
    LOG.info("adding '" + names + "' to exclude file " + excludeFile.toUri().getPath());
    DFSTestUtil.writeFile(localFileSys, excludeFile, name);
    ns.getBlockManager().getDatanodeManager().refreshNodes(conf);
    DFSTestUtil.waitForDecommission(fs, name);

    // Check the block still has sufficient # replicas across racks
    DFSTestUtil.waitForReplication(cluster, b, 2, REPLICATION_FACTOR, 0);
    
    MBeanServer mbs = ManagementFactory.getPlatformMBeanServer();
    ObjectName mxbeanName =
        new ObjectName("Hadoop:service=NameNode,name=NameNodeInfo");
    String nodes = (String) mbs.getAttribute(mxbeanName, "LiveNodes");
    assertTrue("Live nodes should contain the decommissioned node",
        nodes.contains("Decommissioned"));
  } finally {
    cluster.shutdown();
  }
}
Example 18
Source File: TestBlocksWithNotEnoughRacks.java    From big-c with Apache License 2.0 4 votes vote down vote up 
@Test
public void testReplDueToNodeFailRespectsRackPolicy() throws Exception {
  Configuration conf = getConf();
  short REPLICATION_FACTOR = 3;
  final Path filePath = new Path("/testFile");
  // Last datanode is on a different rack
  String racks[] = {"/rack1", "/rack1", "/rack1", "/rack2", "/rack2"};
  MiniDFSCluster cluster = new MiniDFSCluster.Builder(conf)
    .numDataNodes(racks.length).racks(racks).build();
  final FSNamesystem ns = cluster.getNameNode().getNamesystem();
  final DatanodeManager dm = ns.getBlockManager().getDatanodeManager();

  try {
    // Create a file with one block with a replication factor of 2
    final FileSystem fs = cluster.getFileSystem();
    DFSTestUtil.createFile(fs, filePath, 1L, REPLICATION_FACTOR, 1L);
    ExtendedBlock b = DFSTestUtil.getFirstBlock(fs, filePath);
    DFSTestUtil.waitForReplication(cluster, b, 2, REPLICATION_FACTOR, 0);

    // Make the last datanode look like it failed to heartbeat by 
    // calling removeDatanode and stopping it.
    ArrayList<DataNode> datanodes = cluster.getDataNodes();
    int idx = datanodes.size() - 1;
    DataNode dataNode = datanodes.get(idx);
    DatanodeID dnId = dataNode.getDatanodeId();
    cluster.stopDataNode(idx);
    dm.removeDatanode(dnId);

    // The block should still have sufficient # replicas, across racks.
    // The last node may not have contained a replica, but if it did
    // it should have been replicated within the same rack.
    DFSTestUtil.waitForReplication(cluster, b, 2, REPLICATION_FACTOR, 0);
    
    // Fail the last datanode again, it's also on rack2 so there is
    // only 1 rack for all the replicas
    datanodes = cluster.getDataNodes();
    idx = datanodes.size() - 1;
    dataNode = datanodes.get(idx);
    dnId = dataNode.getDatanodeId();
    cluster.stopDataNode(idx);
    dm.removeDatanode(dnId);

    // Make sure we have enough live replicas even though we are
    // short one rack and therefore need one replica
    DFSTestUtil.waitForReplication(cluster, b, 1, REPLICATION_FACTOR, 1);
  } finally {
    cluster.shutdown();
  }
}
Example 19
Source File: TestBlocksWithNotEnoughRacks.java    From big-c with Apache License 2.0 4 votes vote down vote up 
@Test
public void testReduceReplFactorDueToRejoinRespectsRackPolicy() 
    throws Exception {
  Configuration conf = getConf();
  short REPLICATION_FACTOR = 2;
  final Path filePath = new Path("/testFile");
  // Last datanode is on a different rack
  String racks[] = {"/rack1", "/rack1", "/rack2"};
  MiniDFSCluster cluster = new MiniDFSCluster.Builder(conf)
    .numDataNodes(racks.length).racks(racks).build();
  final FSNamesystem ns = cluster.getNameNode().getNamesystem();
  final DatanodeManager dm = ns.getBlockManager().getDatanodeManager();

  try {
    // Create a file with one block
    final FileSystem fs = cluster.getFileSystem();
    DFSTestUtil.createFile(fs, filePath, 1L, REPLICATION_FACTOR, 1L);
    ExtendedBlock b = DFSTestUtil.getFirstBlock(fs, filePath);
    DFSTestUtil.waitForReplication(cluster, b, 2, REPLICATION_FACTOR, 0);

    // Make the last (cross rack) datanode look like it failed
    // to heartbeat by stopping it and calling removeDatanode.
    ArrayList<DataNode> datanodes = cluster.getDataNodes();
    assertEquals(3, datanodes.size());
    DataNode dataNode = datanodes.get(2);
    DatanodeID dnId = dataNode.getDatanodeId();
    cluster.stopDataNode(2);
    dm.removeDatanode(dnId);

    // The block gets re-replicated to another datanode so it has a 
    // sufficient # replicas, but not across racks, so there should
    // be 1 rack, and 1 needed replica (even though there are 2 hosts 
    // available and only 2 replicas required).
    DFSTestUtil.waitForReplication(cluster, b, 1, REPLICATION_FACTOR, 1);

    // Start the "failed" datanode, which has a replica so the block is
    // now over-replicated and therefore a replica should be removed but
    // not on the restarted datanode as that would violate the rack policy.
    String rack2[] = {"/rack2"};
    cluster.startDataNodes(conf, 1, true, null, rack2);
    cluster.waitActive();      
    
    // The block now has sufficient # replicas, across racks
    DFSTestUtil.waitForReplication(cluster, b, 2, REPLICATION_FACTOR, 0);
  } finally {
    cluster.shutdown();
  }
}
Example 20
Source File: TestBlocksWithNotEnoughRacks.java    From big-c with Apache License 2.0 4 votes vote down vote up 
@Test
public void testNodeDecomissionRespectsRackPolicy() throws Exception {
  Configuration conf = getConf();
  short REPLICATION_FACTOR = 2;
  final Path filePath = new Path("/testFile");

  // Configure an excludes file
  FileSystem localFileSys = FileSystem.getLocal(conf);
  Path workingDir = localFileSys.getWorkingDirectory();
  Path dir = new Path(workingDir, "build/test/data/temp/decommission");
  Path excludeFile = new Path(dir, "exclude");
  Path includeFile = new Path(dir, "include");
  assertTrue(localFileSys.mkdirs(dir));
  DFSTestUtil.writeFile(localFileSys, excludeFile, "");
  DFSTestUtil.writeFile(localFileSys, includeFile, "");
  conf.set(DFSConfigKeys.DFS_HOSTS_EXCLUDE, excludeFile.toUri().getPath());
  conf.set(DFSConfigKeys.DFS_HOSTS, includeFile.toUri().getPath());

  // Two blocks and four racks
  String racks[] = {"/rack1", "/rack1", "/rack2", "/rack2"};
  MiniDFSCluster cluster = new MiniDFSCluster.Builder(conf)
    .numDataNodes(racks.length).racks(racks).build();
  final FSNamesystem ns = cluster.getNameNode().getNamesystem();

  try {
    // Create a file with one block
    final FileSystem fs = cluster.getFileSystem();
    DFSTestUtil.createFile(fs, filePath, 1L, REPLICATION_FACTOR, 1L);
    ExtendedBlock b = DFSTestUtil.getFirstBlock(fs, filePath);
    DFSTestUtil.waitForReplication(cluster, b, 2, REPLICATION_FACTOR, 0);

    // Decommission one of the hosts with the block, this should cause 
    // the block to get replicated to another host on the same rack,
    // otherwise the rack policy is violated.
    BlockLocation locs[] = fs.getFileBlockLocations(
        fs.getFileStatus(filePath), 0, Long.MAX_VALUE);
    String name = locs[0].getNames()[0];
    DFSTestUtil.writeFile(localFileSys, excludeFile, name);
    ns.getBlockManager().getDatanodeManager().refreshNodes(conf);
    DFSTestUtil.waitForDecommission(fs, name);

    // Check the block still has sufficient # replicas across racks
    DFSTestUtil.waitForReplication(cluster, b, 2, REPLICATION_FACTOR, 0);
  } finally {
    cluster.shutdown();
  }
}