/**
* Create a MonitoredHostProvider instance using the given HostIdentifier.
*
* @param hostId the host identifier for this MonitoredHost
* @throws MonitorException Thrown on any error encountered while communicating with the remote
* host.
*/
public MonitoredHostProvider(HostIdentifier hostId) throws MonitorException {
this.hostId = hostId;
this.listeners = new ArrayList();
this.interval = DEFAULT_POLLING_INTERVAL;
this.activeVms = new HashSet();
String rmiName;
String sn = serverName;
String path = hostId.getPath();
if ((path != null) && (path.length() > 0)) {
sn = path;
}
if (hostId.getPort() != -1) {
rmiName = "rmi://" + hostId.getHost() + ":" + hostId.getPort() + sn;
} else {
rmiName = "rmi://" + hostId.getHost() + sn;
}
try {
remoteHost = (RemoteHost) Naming.lookup(rmiName);
} catch (RemoteException e) {
/*
* rmi registry not available
*
* Access control exceptions, where the rmi server refuses a
* connection based on policy file configuration, come through
* here on the client side. Unfortunately, the RemoteException
* doesn't contain enough information to determine the true cause
* of the exception. So, we have to output a rather generic message.
*/
String message = "RMI Registry not available at " + hostId.getHost();
if (hostId.getPort() == -1) {
message = message + ":" + java.rmi.registry.Registry.REGISTRY_PORT;
} else {
message = message + ":" + hostId.getPort();
}
if (e.getMessage() != null) {
throw new MonitorException(message + "\n" + e.getMessage(), e);
} else {
throw new MonitorException(message, e);
}
} catch (NotBoundException e) {
// no server with given name
String message = e.getMessage();
if (message == null) message = rmiName;
throw new MonitorException("RMI Server " + message + " not available", e);
} catch (MalformedURLException e) {
// this is a programming problem
e.printStackTrace();
throw new IllegalArgumentException("Malformed URL: " + rmiName);
}
this.vmManager = new RemoteVmManager(remoteHost);
this.timer = new Timer(true);
}
/** Lets the model know if any exceptions occur while communicating with the Interpreter JVM. */
private void _handleRemoteException(RemoteException e) {
if (e instanceof UnmarshalException) {
/* Interpreter JVM has disappeared (perhaps reset); just ignore the error. */
if (e.getCause() instanceof EOFException) return;
/* Deals with bug 2688586: Reset during debugging throws UnmarshalException
* We may want to extend this to all kinds of SocketExceptions. */
if ((e.getCause() instanceof SocketException)
&& (e.getCause().getMessage().equals("Connection reset"))) return;
}
DrJavaErrorHandler.record(e);
}
/**
* ***************************************************************
*
* @param ip
* @param port
* @return
*/
public ChordMessageInterface rmiChord(String ip, int port) {
ChordMessageInterface chord = null;
try {
Registry registry = LocateRegistry.getRegistry(ip, port);
chord = (ChordMessageInterface) (registry.lookup("Chord"));
return chord;
} catch (RemoteException e) {
e.printStackTrace();
} catch (NotBoundException e) {
e.printStackTrace();
}
return null;
}
/**
* Construct a client-side proxy that implements the named protocol, talking to a server at the
* named address.
*
* @param protocol protocol
* @param clientVersion client's version
* @param addr server address
* @param ticket security ticket
* @param conf configuration
* @param factory socket factory
* @param rpcTimeout max time for each rpc; 0 means no timeout
* @return the proxy
* @throws IOException if any error occurs
*/
@SuppressWarnings("unchecked")
public static <T extends VersionedProtocol> ProtocolProxy<T> getProtocolProxy(
Class<T> protocol,
long clientVersion,
InetSocketAddress addr,
UserGroupInformation ticket,
Configuration conf,
SocketFactory factory,
int rpcTimeout)
throws IOException {
T proxy =
(T)
Proxy.newProxyInstance(
protocol.getClassLoader(),
new Class[] {protocol},
new Invoker(addr, ticket, conf, factory, rpcTimeout, protocol));
String protocolName = protocol.getName();
try {
ProtocolSignature serverInfo =
proxy.getProtocolSignature(
protocolName, clientVersion, ProtocolSignature.getFingerprint(protocol.getMethods()));
return new ProtocolProxy<T>(protocol, proxy, serverInfo.getMethods());
} catch (RemoteException re) {
IOException ioe = re.unwrapRemoteException(IOException.class);
if (ioe.getMessage()
.startsWith(IOException.class.getName() + ": " + NoSuchMethodException.class.getName())) {
// Method getProtocolSignature not supported
long serverVersion = proxy.getProtocolVersion(protocol.getName(), clientVersion);
if (serverVersion == clientVersion) {
return new ProtocolProxy<T>(protocol, proxy, null);
}
throw new VersionMismatch(protocolName, clientVersion, serverVersion, proxy);
}
throw re;
}
}
/**
* @param argv The parameters passed to this program.
* @exception Exception if the filesystem does not exist.
* @return 0 on success, non zero on error.
*/
private int processArgs(String[] argv) throws Exception {
if (argv.length < 1) {
printUsage("");
return -1;
}
int exitCode = -1;
int i = 0;
String cmd = argv[i++];
//
// verify that we have enough command line parameters
//
if ("-geteditsize".equals(cmd)) {
if (argv.length != 1) {
printUsage(cmd);
return exitCode;
}
} else if ("-checkpoint".equals(cmd)) {
if (argv.length != 1 && argv.length != 2) {
printUsage(cmd);
return exitCode;
}
if (argv.length == 2 && !"force".equals(argv[i])) {
printUsage(cmd);
return exitCode;
}
}
exitCode = 0;
try {
if ("-checkpoint".equals(cmd)) {
long size = namenode.getEditLogSize();
if (size >= checkpointSize || argv.length == 2 && "force".equals(argv[i])) {
doCheckpoint();
} else {
System.err.println(
"EditLog size "
+ size
+ " bytes is "
+ "smaller than configured checkpoint "
+ "size "
+ checkpointSize
+ " bytes.");
System.err.println("Skipping checkpoint.");
}
} else if ("-geteditsize".equals(cmd)) {
long size = namenode.getEditLogSize();
System.out.println("EditLog size is " + size + " bytes");
} else {
exitCode = -1;
LOG.error(cmd.substring(1) + ": Unknown command");
printUsage("");
}
} catch (RemoteException e) {
//
// This is a error returned by hadoop server. Print
// out the first line of the error mesage, ignore the stack trace.
exitCode = -1;
try {
String[] content;
content = e.getLocalizedMessage().split("\n");
LOG.error(cmd.substring(1) + ": " + content[0]);
} catch (Exception ex) {
LOG.error(cmd.substring(1) + ": " + ex.getLocalizedMessage());
}
} catch (IOException e) {
//
// IO exception encountered locally.
//
exitCode = -1;
LOG.error(cmd.substring(1) + ": " + e.getLocalizedMessage());
} finally {
// Does the RPC connection need to be closed?
}
return exitCode;
}