Java NameNode.DEFAULT_PORT属性代码示例

/**
 * Make sure that client failover works when an active NN dies and the standby
 * takes over.
 */
@Test
public void testDfsClientFailover() throws IOException, URISyntaxException {
  FileSystem fs = HATestUtil.configureFailoverFs(cluster, conf);
  
  DFSTestUtil.createFile(fs, TEST_FILE,
      FILE_LENGTH_TO_VERIFY, (short)1, 1L);
  
  assertEquals(fs.getFileStatus(TEST_FILE).getLen(), FILE_LENGTH_TO_VERIFY);
  cluster.shutdownNameNode(0);
  cluster.transitionToActive(1);
  assertEquals(fs.getFileStatus(TEST_FILE).getLen(), FILE_LENGTH_TO_VERIFY);
  
  // Check that it functions even if the URL becomes canonicalized
  // to include a port number.
  Path withPort = new Path("hdfs://" +
      HATestUtil.getLogicalHostname(cluster) + ":" +
      NameNode.DEFAULT_PORT + "/" + TEST_FILE.toUri().getPath());
  FileSystem fs2 = withPort.getFileSystem(fs.getConf());
  assertTrue(fs2.exists(withPort));

  fs.close();
}
 

/**
 * Select the delegation token for hdfs.  The port will be rewritten to
 * the port of hdfs.service.host_$nnAddr, or the default rpc namenode port. 
 * This method should only be called by non-hdfs filesystems that do not
 * use the rpc port to acquire tokens.  Ex. webhdfs, hftp 
 * @param nnUri of the remote namenode
 * @param tokens as a collection
 * @param conf hadoop configuration
 * @return Token
 */
public Token<DelegationTokenIdentifier> selectToken(
    final URI nnUri, Collection<Token<?>> tokens,
    final Configuration conf) {
  // this guesses the remote cluster's rpc service port.
  // the current token design assumes it's the same as the local cluster's
  // rpc port unless a config key is set.  there should be a way to automatic
  // and correctly determine the value
  Text serviceName = SecurityUtil.buildTokenService(nnUri);
  final String nnServiceName = conf.get(SERVICE_NAME_KEY + serviceName);
  
  int nnRpcPort = NameNode.DEFAULT_PORT;
  if (nnServiceName != null) {
    nnRpcPort = NetUtils.createSocketAddr(nnServiceName, nnRpcPort).getPort(); 
  }
  // use original hostname from the uri to avoid unintentional host resolving
  serviceName = SecurityUtil.buildTokenService(
  		NetUtils.createSocketAddrForHost(nnUri.getHost(), nnRpcPort));
  
  return selectToken(serviceName, tokens);
}
 

/**
 * This constructor has the signature needed by
 * {@link AbstractFileSystem#createFileSystem(URI, Configuration)}
 * 
 * @param theUri which must be that of Hdfs
 * @param conf configuration
 * @throws IOException
 */
Hdfs(final URI theUri, final Configuration conf) throws IOException, URISyntaxException {
  super(theUri, HdfsConstants.HDFS_URI_SCHEME, true, NameNode.DEFAULT_PORT);

  if (!theUri.getScheme().equalsIgnoreCase(HdfsConstants.HDFS_URI_SCHEME)) {
    throw new IllegalArgumentException("Passed URI's scheme is not for Hdfs");
  }
  String host = theUri.getHost();
  if (host == null) {
    throw new IOException("Incomplete HDFS URI, no host: " + theUri);
  }

  this.dfs = new DFSClient(theUri, conf, getStatistics());
}
 

@Override
public int getUriDefaultPort() {
  return NameNode.DEFAULT_PORT;
}
 

/** Creates the Failover proxy provider instance*/
@VisibleForTesting
public static <T> AbstractNNFailoverProxyProvider<T> createFailoverProxyProvider(
    Configuration conf, URI nameNodeUri, Class<T> xface, boolean checkPort,
    AtomicBoolean fallbackToSimpleAuth) throws IOException {
  Class<FailoverProxyProvider<T>> failoverProxyProviderClass = null;
  AbstractNNFailoverProxyProvider<T> providerNN;
  Preconditions.checkArgument(
      xface.isAssignableFrom(NamenodeProtocols.class),
      "Interface %s is not a NameNode protocol", xface);
  try {
    // Obtain the class of the proxy provider
    failoverProxyProviderClass = getFailoverProxyProviderClass(conf,
        nameNodeUri);
    if (failoverProxyProviderClass == null) {
      return null;
    }
    // Create a proxy provider instance.
    Constructor<FailoverProxyProvider<T>> ctor = failoverProxyProviderClass
        .getConstructor(Configuration.class, URI.class, Class.class);
    FailoverProxyProvider<T> provider = ctor.newInstance(conf, nameNodeUri,
        xface);

    // If the proxy provider is of an old implementation, wrap it.
    if (!(provider instanceof AbstractNNFailoverProxyProvider)) {
      providerNN = new WrappedFailoverProxyProvider<T>(provider);
    } else {
      providerNN = (AbstractNNFailoverProxyProvider<T>)provider;
    }
  } catch (Exception e) {
    String message = "Couldn't create proxy provider " + failoverProxyProviderClass;
    if (LOG.isDebugEnabled()) {
      LOG.debug(message, e);
    }
    if (e.getCause() instanceof IOException) {
      throw (IOException) e.getCause();
    } else {
      throw new IOException(message, e);
    }
  }

  // Check the port in the URI, if it is logical.
  if (checkPort && providerNN.useLogicalURI()) {
    int port = nameNodeUri.getPort();
    if (port > 0 && port != NameNode.DEFAULT_PORT) {
      // Throwing here without any cleanup is fine since we have not
      // actually created the underlying proxies yet.
      throw new IOException("Port " + port + " specified in URI "
          + nameNodeUri + " but host '" + nameNodeUri.getHost()
          + "' is a logical (HA) namenode"
          + " and does not use port information.");
    }
  }
  providerNN.setFallbackToSimpleAuth(fallbackToSimpleAuth);
  return providerNN;
}
 

@Override
protected int getDefaultPort() {
  return NameNode.DEFAULT_PORT;
}