import org.apache.hadoop.hdfs.DFSUtil.ConfiguredNNAddress; //导入依赖的package包/类
@Override
public int doWorkInternal(GetConf tool, String []args) throws IOException {
  Configuration config = tool.getConf();
  List<ConfiguredNNAddress> cnnlist = DFSUtil.flattenAddressMap(
      DFSUtil.getNNServiceRpcAddressesForCluster(config));
  if (!cnnlist.isEmpty()) {
    for (ConfiguredNNAddress cnn : cnnlist) {
      InetSocketAddress rpc = cnn.getAddress();
      tool.printOut(rpc.getHostName()+":"+rpc.getPort());
    }
    return 0;
  }
  tool.printError("Did not get namenode service rpc addresses.");
  return -1;
}
 

import org.apache.hadoop.hdfs.DFSUtil.ConfiguredNNAddress; //导入依赖的package包/类
void printMap(Map<String, Map<String, InetSocketAddress>> map) {
  StringBuilder buffer = new StringBuilder();

  List<ConfiguredNNAddress> cnns = DFSUtil.flattenAddressMap(map);
  for (ConfiguredNNAddress cnn : cnns) {
    InetSocketAddress address = cnn.getAddress();
    if (buffer.length() > 0) {
      buffer.append(" ");
    }
    buffer.append(address.getHostName());
  }
  printOut(buffer.toString());
}
 

import org.apache.hadoop.hdfs.DFSUtil.ConfiguredNNAddress; //导入依赖的package包/类
private String[] toStringArray(List<ConfiguredNNAddress> list) {
  String[] ret = new String[list.size()];
  for (int i = 0; i < list.size(); i++) {
    ret[i] = NetUtils.getHostPortString(list.get(i).getAddress());
  }
  return ret;
}
 

import org.apache.hadoop.hdfs.DFSUtil.ConfiguredNNAddress; //导入依赖的package包/类
/**
 * Using {@link GetConf} methods get the list of given {@code type} of
 * addresses
 * 
 * @param type, TestType
 * @param conf, configuration
 * @param checkPort, If checkPort is true, verify NNPRCADDRESSES whose 
 *      expected value is hostname:rpc-port.  If checkPort is false, the 
 *      expected is hostname only.
 * @param expected, expected addresses
 */
private void getAddressListFromTool(TestType type, HdfsConfiguration conf,
    boolean checkPort, List<ConfiguredNNAddress> expected) throws Exception {
  String out = getAddressListFromTool(type, conf, expected.size() != 0);
  List<String> values = new ArrayList<String>();
  
  // Convert list of addresses returned to an array of string
  StringTokenizer tokenizer = new StringTokenizer(out);
  while (tokenizer.hasMoreTokens()) {
    String s = tokenizer.nextToken().trim();
    values.add(s);
  }
  String[] actual = values.toArray(new String[values.size()]);

  // Convert expected list to String[] of hosts
  int i = 0;
  String[] expectedHosts = new String[expected.size()];
  for (ConfiguredNNAddress cnn : expected) {
    InetSocketAddress addr = cnn.getAddress();
    if (!checkPort) {
      expectedHosts[i++] = addr.getHostName();
    }else {
      expectedHosts[i++] = addr.getHostName()+":"+addr.getPort();
    }
  }

  // Compare two arrays
  assertTrue(Arrays.equals(expectedHosts, actual));
}
 

import org.apache.hadoop.hdfs.DFSUtil.ConfiguredNNAddress; //导入依赖的package包/类
private void verifyAddresses(HdfsConfiguration conf, TestType type,
    boolean checkPort, String... expected) throws Exception {
  // Ensure DFSUtil returned the right set of addresses
  Map<String, Map<String, InetSocketAddress>> map =
    getAddressListFromConf(type, conf);
  List<ConfiguredNNAddress> list = DFSUtil.flattenAddressMap(map);
  String[] actual = toStringArray(list);
  Arrays.sort(actual);
  Arrays.sort(expected);
  assertArrayEquals(expected, actual);

  // Test GetConf returned addresses
  getAddressListFromTool(type, conf, checkPort, list);
}
 

import org.apache.hadoop.hdfs.DFSUtil.ConfiguredNNAddress; //导入依赖的package包/类
@Override
public int doWorkInternal(GetConf tool, String []args) throws IOException {
  Configuration config = tool.getConf();
  List<ConfiguredNNAddress> cnnlist = DFSUtil.flattenAddressMap(
      DFSUtil.getNNServiceRpcAddresses(config));
  if (!cnnlist.isEmpty()) {
    for (ConfiguredNNAddress cnn : cnnlist) {
      InetSocketAddress rpc = cnn.getAddress();
      tool.printOut(rpc.getHostName()+":"+rpc.getPort());
    }
    return 0;
  }
  tool.printError("Did not get namenode service rpc addresses.");
  return -1;
}
 

import org.apache.hadoop.hdfs.DFSUtil.ConfiguredNNAddress; //导入依赖的package包/类
private void verifyAddresses(HdfsConfiguration conf, TestType type,
    boolean checkPort, String... expected) throws Exception {
  // Ensure DFSUtil returned the right set of addresses
  Map<String, Map<String, InetSocketAddress>> map =
    getAddressListFromConf(type, conf);
  List<ConfiguredNNAddress> list = DFSUtil.flattenAddressMap(map);
  String[] actual = toStringArray(list);
  Arrays.sort(actual);
  Arrays.sort(expected);
  assertTrue(Arrays.equals(expected, actual));

  // Test GetConf returned addresses
  getAddressListFromTool(type, conf, checkPort, list);
}