HADOOP-8210. Common side of HDFS-3148: The client should be able to use multiple local interfaces for data transfer. Contributed by Eli Collins

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1308457 13f79535-47bb-0310-9956-ffa450edef68

hadoop-common-project/hadoop-common/CHANGES.txt

@@ -140,6 +140,9 @@ Release 2.0.0 - UNRELEASED
 
     HADOOP-8206. Common portion of a ZK-based failover controller (todd)
 
+    HADOOP-8210. Common side of HDFS-3148: The client should be able
+    to use multiple local interfaces for data transfer. (eli)
+
   IMPROVEMENTS
 
     HADOOP-7524. Change RPC to allow multiple protocols including multuple

hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/net/DNS.java

@@ -27,7 +27,10 @@ import java.net.InetAddress;
 import java.net.NetworkInterface;
 import java.net.SocketException;
 import java.net.UnknownHostException;
+import java.util.Collections;
 import java.util.Enumeration;
+import java.util.LinkedHashSet;
+import java.util.Set;
 import java.util.Vector;
 
 import javax.naming.NamingException;
@@ -113,6 +116,31 @@ public class DNS {
     return null;
   }
 
+  /**
+   * @param nif network interface to get addresses for
+   * @return set containing addresses for each subinterface of nif,
+   *    see below for the rationale for using an ordered set
+   */
+  private static LinkedHashSet<InetAddress> getSubinterfaceInetAddrs(
+      NetworkInterface nif) {
+    LinkedHashSet<InetAddress> addrs = new LinkedHashSet<InetAddress>();
+    Enumeration<NetworkInterface> subNifs = nif.getSubInterfaces();
+    while (subNifs.hasMoreElements()) {
+      NetworkInterface subNif = subNifs.nextElement();
+      addrs.addAll(Collections.list(subNif.getInetAddresses()));
+    }
+    return addrs;
+  }
+
+  /**
+   * Like {@link DNS#getIPs(String, boolean), but returns all
+   * IPs associated with the given interface and its subinterfaces.
+   */
+  public static String[] getIPs(String strInterface)
+      throws UnknownHostException {
+    return getIPs(strInterface, true);
+  }
+
   /**
    * Returns all the IPs associated with the provided interface, if any, in
    * textual form.
@@ -120,6 +148,9 @@ public class DNS {
    * @param strInterface
    *            The name of the network interface or sub-interface to query
    *            (eg eth0 or eth0:0) or the string "default"
+   * @param returnSubinterfaces
+   *            Whether to return IPs associated with subinterfaces of
+   *            the given interface
    * @return A string vector of all the IPs associated with the provided
    *         interface. The local host IP is returned if the interface
    *         name "default" is specified or there is an I/O error looking
@@ -128,8 +159,8 @@ public class DNS {
    *             If the given interface is invalid
    * 
    */
-  public static String[] getIPs(String strInterface)
-    throws UnknownHostException {
+  public static String[] getIPs(String strInterface,
+      boolean returnSubinterfaces) throws UnknownHostException {
     if ("default".equals(strInterface)) {
       return new String[] { cachedHostAddress };
     }
@@ -147,12 +178,22 @@ public class DNS {
     if (netIf == null) {
       throw new UnknownHostException("No such interface " + strInterface);
     }
-    Vector<String> ips = new Vector<String>();
-    Enumeration<InetAddress> addrs = netIf.getInetAddresses();
-    while (addrs.hasMoreElements()) {
-      ips.add(addrs.nextElement().getHostAddress());
+
+    // NB: Using a LinkedHashSet to preserve the order for callers
+    // that depend on a particular element being 1st in the array.
+    // For example, getDefaultIP always returns the first element.
+    LinkedHashSet<InetAddress> allAddrs = new LinkedHashSet<InetAddress>();
+    allAddrs.addAll(Collections.list(netIf.getInetAddresses()));
+    if (!returnSubinterfaces) {
+      allAddrs.removeAll(getSubinterfaceInetAddrs(netIf));
     }
-    return ips.toArray(new String[] {});
+
+    String ips[] = new String[allAddrs.size()];
+    int i = 0;
+    for (InetAddress addr : allAddrs) {
+      ips[i++] = addr.getHostAddress();
+    }
+    return ips;
   }
 
 
@@ -256,7 +297,7 @@ public class DNS {
     return address;
   }
 
-    /**
+  /**
    * Returns all the host names associated by the default nameserver with the
    * address bound to the specified network interface
    * 

hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/net/NetUtils.java

@@ -43,6 +43,8 @@ import javax.net.SocketFactory;
 
 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
+import org.apache.commons.net.util.SubnetUtils;
+import org.apache.commons.net.util.SubnetUtils.SubnetInfo;
 import org.apache.hadoop.classification.InterfaceAudience;
 import org.apache.hadoop.classification.InterfaceStability;
 import org.apache.hadoop.conf.Configuration;
@@ -51,6 +53,8 @@ import org.apache.hadoop.ipc.VersionedProtocol;
 import org.apache.hadoop.security.SecurityUtil;
 import org.apache.hadoop.util.ReflectionUtils;
 
+import com.google.common.base.Preconditions;
+
 @InterfaceAudience.LimitedPrivate({"HDFS", "MapReduce"})
 @InterfaceStability.Unstable
 public class NetUtils {
@@ -469,11 +473,27 @@ public class NetUtils {
    * @see java.net.Socket#connect(java.net.SocketAddress, int)
    * 
    * @param socket
-   * @param endpoint 
-   * @param timeout - timeout in milliseconds
+   * @param address the remote address
+   * @param timeout timeout in milliseconds
+   */
+  public static void connect(Socket socket,
+      SocketAddress address,
+      int timeout) throws IOException {
+    connect(socket, address, null, timeout);
+  }
+
+  /**
+   * Like {@link NetUtils#connect(Socket, SocketAddress, int)} but
+   * also takes a local address and port to bind the socket to. 
+   * 
+   * @param socket
+   * @param address the remote address
+   * @param localAddr the local address to bind the socket to
+   * @param timeout timeout in milliseconds
    */
   public static void connect(Socket socket, 
                              SocketAddress endpoint,
+                             SocketAddress localAddr,
                              int timeout) throws IOException {
     if (socket == null || endpoint == null || timeout < 0) {
       throw new IllegalArgumentException("Illegal argument for connect()");
@@ -481,6 +501,15 @@ public class NetUtils {
     
     SocketChannel ch = socket.getChannel();
     
+    if (localAddr != null) {
+      Class localClass = localAddr.getClass();
+      Class remoteClass = endpoint.getClass();
+      Preconditions.checkArgument(localClass.equals(remoteClass),
+          "Local address %s must be of same family as remote address %s.",
+          localAddr, endpoint);
+      socket.bind(localAddr);
+    }
+
     if (ch == null) {
       // let the default implementation handle it.
       socket.connect(endpoint, timeout);
@@ -769,4 +798,70 @@ public class NetUtils {
         ("\"" + hostname + "\"")
         : UNKNOWN_HOST;
   }
+
+  /**
+   * @return true if the given string is a subnet specified
+   *     using CIDR notation, false otherwise
+   */
+  public static boolean isValidSubnet(String subnet) {
+    try {
+      new SubnetUtils(subnet);
+      return true;
+    } catch (IllegalArgumentException iae) {
+      return false;
+    }
+  }
+
+  /**
+   * Add all addresses associated with the given nif in the
+   * given subnet to the given list.
+   */
+  private static void addMatchingAddrs(NetworkInterface nif,
+      SubnetInfo subnetInfo, List<InetAddress> addrs) {
+    Enumeration<InetAddress> ifAddrs = nif.getInetAddresses();
+    while (ifAddrs.hasMoreElements()) {
+      InetAddress ifAddr = ifAddrs.nextElement();
+      if (subnetInfo.isInRange(ifAddr.getHostAddress())) {
+        addrs.add(ifAddr);
+      }
+    }
+  }
+
+  /**
+   * Return an InetAddress for each interface that matches the
+   * given subnet specified using CIDR notation.
+   *
+   * @param subnet subnet specified using CIDR notation
+   * @param returnSubinterfaces
+   *            whether to return IPs associated with subinterfaces
+   * @throws IllegalArgumentException if subnet is invalid
+   */
+  public static List<InetAddress> getIPs(String subnet,
+      boolean returnSubinterfaces) {
+    List<InetAddress> addrs = new ArrayList<InetAddress>();
+    SubnetInfo subnetInfo = new SubnetUtils(subnet).getInfo();
+    Enumeration<NetworkInterface> nifs;
+
+    try {
+      nifs = NetworkInterface.getNetworkInterfaces();
+    } catch (SocketException e) {
+      LOG.error("Unable to get host interfaces", e);
+      return addrs;
+    }
+
+    while (nifs.hasMoreElements()) {
+      NetworkInterface nif = nifs.nextElement();
+      // NB: adding addresses even if the nif is not up
+      addMatchingAddrs(nif, subnetInfo, addrs);
+
+      if (!returnSubinterfaces) {
+        continue;
+      }
+      Enumeration<NetworkInterface> subNifs = nif.getSubInterfaces();
+      while (subNifs.hasMoreElements()) {
+        addMatchingAddrs(subNifs.nextElement(), subnetInfo, addrs);
+      }
+    }
+    return addrs;
+  }
 }