Bug with IPv6 address

[Zhou <ne...@gmail.com>]

HBase might crash when the network card has a IPv6 address
In order to avoid the problem,
I modify a method in class: org.apache.hadoop.net.DNS

The following is the modified code of this method, it would not return IPv6
address now.

/**
   * Returns all the IPs associated with the provided interface, if any, in
   * textual form.
   * 
   * @param strInterface
   *            The name of the network interface to query (e.g. eth0)
   * @return A string vector of all the IPs associated with the provided
   *         interface
   * @throws UnknownHostException
   *             If an UnknownHostException is encountered in querying the
   *             default interface
   * 
   */
  public static String[] getIPs(String strInterface)
  throws UnknownHostException {
	    try {
	      NetworkInterface netIF = NetworkInterface.getByName(strInterface);
	      if (netIF == null)
	        return new String[] { InetAddress.getLocalHost()
	                              .getHostAddress() };
	      else {
	        Vector<String> ips = new Vector<String>();
	        Enumeration e = netIF.getInetAddresses();
	        while (e.hasMoreElements())
	          				{
	        	String addr=((InetAddress) e.nextElement()).getHostAddress();
	        	if(addr.length()<=15)//only when it is a IPv4 address
	        		ips.add(addr);
	        	//ips.add(((InetAddress) e.nextElement()).getHostAddress());
	          				}
	        return ips.toArray(new String[] {});
	      }
	    } catch (SocketException e) {
	      return new String[] { InetAddress.getLocalHost().getHostAddress() };
	    }
  }