Java MiniDFSCluster類代碼示例

import org.apache.hadoop.hdfs.MiniDFSCluster; //導入依賴的package包/類
/**
 * Assert that, if sdToLock is locked, the cluster is not allowed to start up.
 * @param conf cluster conf to use
 * @param sdToLock the storage directory to lock
 */
private static void assertClusterStartFailsWhenDirLocked(
    Configuration conf, StorageDirectory sdToLock) throws IOException {
  // Lock the edits dir, then start the NN, and make sure it fails to start
  sdToLock.lock();
  MiniDFSCluster cluster = null;
  try {      
    cluster = new MiniDFSCluster.Builder(conf).format(false)
        .manageNameDfsDirs(false).numDataNodes(0).build();
    assertFalse("cluster should fail to start after locking " +
        sdToLock, sdToLock.isLockSupported());
  } catch (IOException ioe) {
    GenericTestUtils.assertExceptionContains("already locked", ioe);
  } finally {
    cleanup(cluster);
    cluster = null;
    sdToLock.unlock();
  }
}
 

import org.apache.hadoop.hdfs.MiniDFSCluster; //導入依賴的package包/類
private MiniDFSCluster createCluster() throws HDFSQuasiServiceException {
  MiniDFSCluster hdfsCluster = null;

  File baseDir = new File(getWorkingDir()).getAbsoluteFile();
  FileUtil.fullyDelete(baseDir);
  this.conf.set(MiniDFSCluster.HDFS_MINIDFS_BASEDIR, baseDir.getAbsolutePath());

  LOG.info("Using base dir " + baseDir.getAbsolutePath());

  MiniDFSCluster.Builder builder = new MiniDFSCluster.Builder(this.conf);
  builder.numDataNodes(getNumberOfDataNodes());
  try {
    hdfsCluster = builder.build();
  } catch (IOException e) {
    LOG.error("Error in creating mini DFS cluster ", e);
    throw new HDFSQuasiServiceException("Error in creating mini DFS cluster ", e);
  }
  ListIterator<DataNode> itr = hdfsCluster.getDataNodes().listIterator();
  LOG.info("NameNode: " + hdfsCluster.getNameNode().getNameNodeAddressHostPortString());
  while (itr.hasNext()) {
    DataNode dn = itr.next();
    LOG.info("DataNode: " + dn.getDisplayName());
  }
  return hdfsCluster;
}
 

import org.apache.hadoop.hdfs.MiniDFSCluster; //導入依賴的package包/類
@Test
public void testDTInInsecureCluster() throws Exception {
  MiniDFSCluster cluster = null;
  final Configuration conf = WebHdfsTestUtil.createConf();
  try {
    cluster = new MiniDFSCluster.Builder(conf).numDataNodes(0).build();
    final FileSystem webHdfs = WebHdfsTestUtil.getWebHdfsFileSystem(conf,
        WebHdfsFileSystem.SCHEME);
    webHdfs.getDelegationToken(null);
    fail("No exception is thrown.");
  } catch (AccessControlException ace) {
    Assert.assertTrue(ace.getMessage().startsWith(
        WebHdfsFileSystem.CANT_FALLBACK_TO_INSECURE_MSG));
  } finally {
    if (cluster != null) {
      cluster.shutdown();
    }
  }
}
 

import org.apache.hadoop.hdfs.MiniDFSCluster; //導入依賴的package包/類
@Test
public void testWriteToTemporary() throws Exception {
  MiniDFSCluster cluster = new MiniDFSCluster.Builder(new HdfsConfiguration()).build();
  try {
    cluster.waitActive();
    DataNode dn = cluster.getDataNodes().get(0);
    FsDatasetImpl dataSet = (FsDatasetImpl)DataNodeTestUtils.getFSDataset(dn);

    // set up replicasMap
    String bpid = cluster.getNamesystem().getBlockPoolId();
    ExtendedBlock[] blocks = setup(bpid, dataSet);

    // test writeToTemporary
    testWriteToTemporary(dataSet, blocks);
  } finally {
    cluster.shutdown();
  }
}
 

import org.apache.hadoop.hdfs.MiniDFSCluster; //導入依賴的package包/類
public void testMerge() throws Exception {
  MiniDFSCluster dfsCluster = null;
  MiniMRClientCluster mrCluster = null;
  FileSystem fileSystem = null;
  try {
    Configuration conf = new Configuration();
    // Start the mini-MR and mini-DFS clusters
    dfsCluster = new MiniDFSCluster.Builder(conf)
        .numDataNodes(NUM_HADOOP_DATA_NODES).build();
    fileSystem = dfsCluster.getFileSystem();
    mrCluster = MiniMRClientClusterFactory.create(this.getClass(),
                                               NUM_HADOOP_DATA_NODES, conf);
    // Generate input.
    createInput(fileSystem);
    // Run the test.
    runMergeTest(new JobConf(mrCluster.getConfig()), fileSystem);
  } finally {
    if (dfsCluster != null) {
      dfsCluster.shutdown();
    }
    if (mrCluster != null) {
      mrCluster.stop();
    }
  }
}
 

import org.apache.hadoop.hdfs.MiniDFSCluster; //導入依賴的package包/類
@Before
public void setup() throws Exception {
  File editsDir = new File(MiniDFSCluster.getBaseDirectory() +
      File.separator + "TestJournalNode");
  FileUtil.fullyDelete(editsDir);
  
  conf.set(DFSConfigKeys.DFS_JOURNALNODE_EDITS_DIR_KEY,
      editsDir.getAbsolutePath());
  conf.set(DFSConfigKeys.DFS_JOURNALNODE_RPC_ADDRESS_KEY,
      "0.0.0.0:0");
  jn = new JournalNode();
  jn.setConf(conf);
  jn.start();
  journalId = "test-journalid-" + GenericTestUtils.uniqueSequenceId();
  journal = jn.getOrCreateJournal(journalId);
  journal.format(FAKE_NSINFO);
  
  ch = new IPCLoggerChannel(conf, FAKE_NSINFO, journalId, jn.getBoundIpcAddress());
}
 

import org.apache.hadoop.hdfs.MiniDFSCluster; //導入依賴的package包/類
/** Start a cluster */
@Before
public void setup() throws Exception {
  conf = new HdfsConfiguration();
  conf.setBoolean(DFS_NAMENODE_ENABLE_RETRY_CACHE_KEY, true);
  conf.setInt(DFSConfigKeys.DFS_CLIENT_TEST_DROP_NAMENODE_RESPONSE_NUM_KEY, 2);
  cluster = new MiniDFSCluster.Builder(conf)
      .nnTopology(MiniDFSNNTopology.simpleHATopology()).numDataNodes(3)
      .build();
  cluster.waitActive();
  cluster.transitionToActive(namenodeId);
  HATestUtil.setFailoverConfigurations(cluster, conf);
  filesystem = (DistributedFileSystem) HATestUtil.configureFailoverFs(cluster, conf);
  namesystem = cluster.getNamesystem(namenodeId);
  metrics = namesystem.getRetryCache().getMetricsForTests();
}
 

import org.apache.hadoop.hdfs.MiniDFSCluster; //導入依賴的package包/類
public void testWithDFS() throws IOException {
  MiniDFSCluster dfs = null;
  MiniMRCluster mr = null;
  FileSystem fileSys = null;
  try {
    final int taskTrackers = 4;

    JobConf conf = new JobConf();
    conf.set(JTConfig.JT_SYSTEM_DIR, "/tmp/custom/mapred/system");
    dfs = new MiniDFSCluster.Builder(conf).numDataNodes(4).build();
    fileSys = dfs.getFileSystem();
    mr = new MiniMRCluster(taskTrackers, fileSys.getUri().toString(), 1, null, null, conf);

    runWordCount(mr, mr.createJobConf(), conf.get("mapred.system.dir"));
  } finally {
    if (dfs != null) { dfs.shutdown(); }
    if (mr != null) { mr.shutdown();
    }
  }
}
 

import org.apache.hadoop.hdfs.MiniDFSCluster; //導入依賴的package包/類
@BeforeClass
public static void setUp() throws Exception {
  final Configuration conf = new Configuration();
  
  conf.set(MRConfig.FRAMEWORK_NAME, MRConfig.YARN_FRAMEWORK_NAME);
  conf.set(YarnConfiguration.RM_PRINCIPAL, "jt_id/" + SecurityUtil.HOSTNAME_PATTERN + "@APACHE.ORG");
  
  final MiniDFSCluster.Builder builder = new MiniDFSCluster.Builder(conf);
  builder.checkExitOnShutdown(true);
  builder.numDataNodes(numSlaves);
  builder.format(true);
  builder.racks(null);
  dfsCluster = builder.build();
  
  mrCluster = new MiniMRYarnCluster(TestBinaryTokenFile.class.getName(), noOfNMs);
  mrCluster.init(conf);
  mrCluster.start();

  NameNodeAdapter.getDtSecretManager(dfsCluster.getNamesystem()).startThreads(); 
  
  FileSystem fs = dfsCluster.getFileSystem(); 
  p1 = new Path("file1");
  p1 = fs.makeQualified(p1);
}
 

import org.apache.hadoop.hdfs.MiniDFSCluster; //導入依賴的package包/類
@Before
public void setUp() throws Exception {
  conf = new Configuration();
  conf.setInt(DFSConfigKeys.DFS_NAMENODE_MAX_XATTRS_PER_INODE_KEY, 2);
  cluster = new MiniDFSCluster.Builder(conf)
    .numDataNodes(REPLICATION)
    .build();
  cluster.waitActive();
  
  fsn = cluster.getNamesystem();
  fsdir = fsn.getFSDirectory();
  
  hdfs = cluster.getFileSystem();
  DFSTestUtil.createFile(hdfs, file1, 1024, REPLICATION, seed);
  DFSTestUtil.createFile(hdfs, file2, 1024, REPLICATION, seed);
  DFSTestUtil.createFile(hdfs, file3, 1024, REPLICATION, seed);

  DFSTestUtil.createFile(hdfs, file5, 1024, REPLICATION, seed);
  hdfs.mkdirs(sub2);

}
 

import org.apache.hadoop.hdfs.MiniDFSCluster; //導入依賴的package包/類
public static Test suite() {
  TestSetup setup = new TestSetup(new TestSuite(TestJoinProperties.class)) {
    protected void setUp() throws Exception {
      Configuration conf = new Configuration();
      cluster = new MiniDFSCluster.Builder(conf).numDataNodes(2).build();
      base = cluster.getFileSystem().makeQualified(new Path("/nested"));
      src = generateSources(conf);
    }
    protected void tearDown() throws Exception {
      if (cluster != null) {
        cluster.shutdown();
      }
    }
  };
  return setup;
}
 

import org.apache.hadoop.hdfs.MiniDFSCluster; //導入依賴的package包/類
@Test
public void testFsckNonExistent() throws Exception {
  DFSTestUtil util = new DFSTestUtil.Builder().setName("TestFsck").
      setNumFiles(20).build();
  MiniDFSCluster cluster = null;
  FileSystem fs = null;
  try {
    Configuration conf = new HdfsConfiguration();
    conf.setLong(DFSConfigKeys.DFS_BLOCKREPORT_INTERVAL_MSEC_KEY, 10000L);
    cluster = new MiniDFSCluster.Builder(conf).numDataNodes(4).build();
    fs = cluster.getFileSystem();
    util.createFiles(fs, "/srcdat");
    util.waitReplication(fs, "/srcdat", (short)3);
    String outStr = runFsck(conf, 0, true, "/non-existent");
    assertEquals(-1, outStr.indexOf(NamenodeFsck.HEALTHY_STATUS));
    System.out.println(outStr);
    util.cleanup(fs, "/srcdat");
  } finally {
    if (fs != null) {try{fs.close();} catch(Exception e){}}
    if (cluster != null) { cluster.shutdown(); }
  }
}
 

import org.apache.hadoop.hdfs.MiniDFSCluster; //導入依賴的package包/類
/**
 * Verify the following scenario.
 * 1. NN restarts.
 * 2. Heartbeat RPC will retry and succeed. NN asks DN to reregister.
 * 3. After reregistration completes, DN will send Heartbeat, followed by
 *    Blockreport.
 * 4. NN will mark DatanodeStorageInfo#blockContentsStale to false.
 * @throws Exception
 */
@Test(timeout = 60000)
public void testStorageBlockContentsStaleAfterNNRestart() throws Exception {
  MiniDFSCluster dfsCluster = null;
  try {
    Configuration config = new Configuration();
    dfsCluster = new MiniDFSCluster.Builder(config).numDataNodes(1).build();
    dfsCluster.waitActive();
    dfsCluster.restartNameNode(true);
    BlockManagerTestUtil.checkHeartbeat(
        dfsCluster.getNamesystem().getBlockManager());
    MBeanServer mbs = ManagementFactory.getPlatformMBeanServer();
    ObjectName mxbeanNameFsns = new ObjectName(
        "Hadoop:service=NameNode,name=FSNamesystemState");
    Integer numStaleStorages = (Integer) (mbs.getAttribute(
        mxbeanNameFsns, "NumStaleStorages"));
    assertEquals(0, numStaleStorages.intValue());
  } finally {
    if (dfsCluster != null) {
      dfsCluster.shutdown();
    }
  }

  return;
}
 

import org.apache.hadoop.hdfs.MiniDFSCluster; //導入依賴的package包/類
@Test
public void testMoverCliWithFederationHA() throws Exception {
  final MiniDFSCluster cluster = new MiniDFSCluster
      .Builder(new HdfsConfiguration())
      .nnTopology(MiniDFSNNTopology.simpleHAFederatedTopology(3))
      .numDataNodes(0).build();
  final Configuration conf = new HdfsConfiguration();
  DFSTestUtil.setFederatedHAConfiguration(cluster, conf);
  try {
    Collection<URI> namenodes = DFSUtil.getNsServiceRpcUris(conf);
    Assert.assertEquals(3, namenodes.size());

    Iterator<URI> iter = namenodes.iterator();
    URI nn1 = iter.next();
    URI nn2 = iter.next();
    URI nn3 = iter.next();
    Map<URI, List<Path>> movePaths = Mover.Cli.getNameNodePathsToMove(conf,
        "-p", nn1 + "/foo", nn1 + "/bar", nn2 + "/foo/bar", nn3 + "/foobar");
    Assert.assertEquals(3, movePaths.size());
    checkMovePaths(movePaths.get(nn1), new Path("/foo"), new Path("/bar"));
    checkMovePaths(movePaths.get(nn2), new Path("/foo/bar"));
    checkMovePaths(movePaths.get(nn3), new Path("/foobar"));
  } finally {
     cluster.shutdown();
  }
}
 

import org.apache.hadoop.hdfs.MiniDFSCluster; //導入依賴的package包/類
/**
 * Test that a implementation of JournalManager without a 
 * (Configuration,URI) constructor throws an exception
 */
@Test
public void testBadConstructor() throws Exception {
  MiniDFSCluster cluster = null;
  Configuration conf = new Configuration();
  
  conf.set(DFSConfigKeys.DFS_NAMENODE_EDITS_PLUGIN_PREFIX + ".dummy",
           BadConstructorJournalManager.class.getName());
  conf.set(DFSConfigKeys.DFS_NAMENODE_EDITS_DIR_KEY,
           "dummy://test");
  try {
    cluster = new MiniDFSCluster.Builder(conf).numDataNodes(0).build();
    cluster.waitActive();
    fail("Should have failed before this point");
  } catch (IllegalArgumentException iae) {
    if (!iae.getMessage().contains("Unable to construct journal")) {
      fail("Should have failed with unable to construct exception");
    }
  } finally {
    if (cluster != null) {
      cluster.shutdown();
    }
  }
}