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HADOOP-7806. Support binding to sub-interfaces. Contributed by Eli Collins 

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1298700 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Eli Collins 2012-03-09 04:43:06 +00:00
parent d8cc362350
commit 07c3b02281
2 changed files with 40 additions and 11 deletions
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2
hadoop-common-project/hadoop-common/CHANGES.txt
View File

@ -234,6 +234,8 @@ Release 0.23.3 - UNRELEASED
HADOOP-7557 Make IPC header be extensible (sanjay radia)
HADOOP-7806. Support binding to sub-interfaces (eli)
OPTIMIZATIONS
BUG FIXES

49
hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/net/DNS.java
View File

@ -90,13 +90,36 @@ public class DNS {
return attribute.get("PTR").get().toString();
}
/**
* @return NetworkInterface for the given subinterface name (eg eth0:0)
* or null if no interface with the given name can be found
*/
private static NetworkInterface getSubinterface(String strInterface)
throws SocketException {
Enumeration<NetworkInterface> nifs =
NetworkInterface.getNetworkInterfaces();
while (nifs.hasMoreElements()) {
Enumeration<NetworkInterface> subNifs =
nifs.nextElement().getSubInterfaces();
while (subNifs.hasMoreElements()) {
NetworkInterface nif = subNifs.nextElement();
if (nif.getName().equals(strInterface)) {
return nif;
}
}
}
return null;
}
/**
* 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)
* or the string "default"
* The name of the network interface or sub-interface to query
* (eg eth0 or eth0:0) or the string "default"
* @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
@ -110,21 +133,24 @@ public class DNS {
if ("default".equals(strInterface)) {
return new String[] { cachedHostAddress };
}
NetworkInterface netIF;
NetworkInterface netIf;
try {
netIF = NetworkInterface.getByName(strInterface);
netIf = NetworkInterface.getByName(strInterface);
if (netIf == null) {
netIf = getSubinterface(strInterface);
}
} catch (SocketException e) {
LOG.warn("I/O error finding interface " + strInterface +
": " + e.getMessage());
return new String[] { cachedHostAddress };
}
if (netIF == null) {
if (netIf == null) {
throw new UnknownHostException("No such interface " + strInterface);
}
Vector<String> ips = new Vector<String>();
Enumeration<InetAddress> e = netIF.getInetAddresses();
while (e.hasMoreElements()) {
ips.add(e.nextElement().getHostAddress());
Enumeration<InetAddress> addrs = netIf.getInetAddresses();
while (addrs.hasMoreElements()) {
ips.add(addrs.nextElement().getHostAddress());
}
return ips.toArray(new String[] {});
}
@ -135,8 +161,8 @@ public class DNS {
* network interface or the local host IP if "default" is given.
*
* @param strInterface
* The name of the network interface to query (e.g. eth0)
* or the string "default"
* The name of the network interface or subinterface to query
* (e.g. eth0 or eth0:0) or the string "default"
* @return The IP address in text form, the local host IP is returned
* if the interface name "default" is specified
* @throws UnknownHostException
@ -153,7 +179,8 @@ public class DNS {
* address bound to the specified network interface
*
* @param strInterface
* The name of the network interface to query (e.g. eth0)
* The name of the network interface or subinterface to query
* (e.g. eth0 or eth0:0)
* @param nameserver
* The DNS host name
* @return A string vector of all host names associated with the IPs tied to