| /** |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package org.apache.hadoop.ipc; |
| |
| import java.lang.reflect.Proxy; |
| import java.lang.reflect.Method; |
| import java.lang.reflect.Array; |
| import java.lang.reflect.InvocationHandler; |
| import java.lang.reflect.InvocationTargetException; |
| |
| import java.net.InetSocketAddress; |
| import java.io.*; |
| import java.util.Map; |
| import java.util.HashMap; |
| |
| import javax.net.SocketFactory; |
| |
| import org.apache.commons.logging.*; |
| |
| import org.apache.hadoop.io.*; |
| import org.apache.hadoop.security.UserGroupInformation; |
| import org.apache.hadoop.security.authorize.ServiceAuthorizationManager; |
| import org.apache.hadoop.security.token.SecretManager; |
| import org.apache.hadoop.security.token.TokenIdentifier; |
| import org.apache.hadoop.conf.*; |
| import org.apache.hadoop.metrics.util.MetricsTimeVaryingRate; |
| |
| /** An RpcEngine implementation for Writable data. */ |
| class WritableRpcEngine implements RpcEngine { |
| private static final Log LOG = LogFactory.getLog(RPC.class); |
| |
| /** A method invocation, including the method name and its parameters.*/ |
| private static class Invocation implements Writable, Configurable { |
| private String methodName; |
| private Class[] parameterClasses; |
| private Object[] parameters; |
| private Configuration conf; |
| |
| public Invocation() {} |
| |
| public Invocation(Method method, Object[] parameters) { |
| this.methodName = method.getName(); |
| this.parameterClasses = method.getParameterTypes(); |
| this.parameters = parameters; |
| } |
| |
| /** The name of the method invoked. */ |
| public String getMethodName() { return methodName; } |
| |
| /** The parameter classes. */ |
| public Class[] getParameterClasses() { return parameterClasses; } |
| |
| /** The parameter instances. */ |
| public Object[] getParameters() { return parameters; } |
| |
| public void readFields(DataInput in) throws IOException { |
| methodName = UTF8.readString(in); |
| parameters = new Object[in.readInt()]; |
| parameterClasses = new Class[parameters.length]; |
| ObjectWritable objectWritable = new ObjectWritable(); |
| for (int i = 0; i < parameters.length; i++) { |
| parameters[i] = ObjectWritable.readObject(in, objectWritable, this.conf); |
| parameterClasses[i] = objectWritable.getDeclaredClass(); |
| } |
| } |
| |
| public void write(DataOutput out) throws IOException { |
| UTF8.writeString(out, methodName); |
| out.writeInt(parameterClasses.length); |
| for (int i = 0; i < parameterClasses.length; i++) { |
| ObjectWritable.writeObject(out, parameters[i], parameterClasses[i], |
| conf); |
| } |
| } |
| |
| public String toString() { |
| StringBuilder buffer = new StringBuilder(); |
| buffer.append(methodName); |
| buffer.append("("); |
| for (int i = 0; i < parameters.length; i++) { |
| if (i != 0) |
| buffer.append(", "); |
| buffer.append(parameters[i]); |
| } |
| buffer.append(")"); |
| return buffer.toString(); |
| } |
| |
| public void setConf(Configuration conf) { |
| this.conf = conf; |
| } |
| |
| public Configuration getConf() { |
| return this.conf; |
| } |
| |
| } |
| |
| /* Cache a client using its socket factory as the hash key */ |
| static private class ClientCache { |
| private Map<SocketFactory, Client> clients = |
| new HashMap<SocketFactory, Client>(); |
| |
| /** |
| * Construct & cache an IPC client with the user-provided SocketFactory |
| * if no cached client exists. |
| * |
| * @param conf Configuration |
| * @return an IPC client |
| */ |
| private synchronized Client getClient(Configuration conf, |
| SocketFactory factory) { |
| // Construct & cache client. The configuration is only used for timeout, |
| // and Clients have connection pools. So we can either (a) lose some |
| // connection pooling and leak sockets, or (b) use the same timeout for all |
| // configurations. Since the IPC is usually intended globally, not |
| // per-job, we choose (a). |
| Client client = clients.get(factory); |
| if (client == null) { |
| client = new Client(ObjectWritable.class, conf, factory); |
| clients.put(factory, client); |
| } else { |
| client.incCount(); |
| } |
| return client; |
| } |
| |
| /** |
| * Construct & cache an IPC client with the default SocketFactory |
| * if no cached client exists. |
| * |
| * @param conf Configuration |
| * @return an IPC client |
| */ |
| private synchronized Client getClient(Configuration conf) { |
| return getClient(conf, SocketFactory.getDefault()); |
| } |
| |
| /** |
| * Stop a RPC client connection |
| * A RPC client is closed only when its reference count becomes zero. |
| */ |
| private void stopClient(Client client) { |
| synchronized (this) { |
| client.decCount(); |
| if (client.isZeroReference()) { |
| clients.remove(client.getSocketFactory()); |
| } |
| } |
| if (client.isZeroReference()) { |
| client.stop(); |
| } |
| } |
| } |
| |
| private static ClientCache CLIENTS=new ClientCache(); |
| |
| private static class Invoker implements InvocationHandler { |
| private Class protocol; |
| private InetSocketAddress address; |
| private UserGroupInformation ticket; |
| private Client client; |
| private boolean isClosed = false; |
| |
| public Invoker(Class protocol, |
| InetSocketAddress address, UserGroupInformation ticket, |
| Configuration conf, SocketFactory factory) { |
| this.protocol = protocol; |
| this.address = address; |
| this.ticket = ticket; |
| this.client = CLIENTS.getClient(conf, factory); |
| } |
| |
| public Object invoke(Object proxy, Method method, Object[] args) |
| throws Throwable { |
| final boolean logDebug = LOG.isDebugEnabled(); |
| long startTime = 0; |
| if (logDebug) { |
| startTime = System.currentTimeMillis(); |
| } |
| |
| ObjectWritable value = (ObjectWritable) |
| client.call(new Invocation(method, args), address, |
| protocol, ticket); |
| if (logDebug) { |
| long callTime = System.currentTimeMillis() - startTime; |
| LOG.debug("Call: " + method.getName() + " " + callTime); |
| } |
| return value.get(); |
| } |
| |
| /* close the IPC client that's responsible for this invoker's RPCs */ |
| synchronized private void close() { |
| if (!isClosed) { |
| isClosed = true; |
| CLIENTS.stopClient(client); |
| } |
| } |
| } |
| |
| /** Construct a client-side proxy object that implements the named protocol, |
| * talking to a server at the named address. */ |
| public Object getProxy(Class protocol, long clientVersion, |
| InetSocketAddress addr, UserGroupInformation ticket, |
| Configuration conf, SocketFactory factory) |
| throws IOException { |
| |
| Object proxy = Proxy.newProxyInstance |
| (protocol.getClassLoader(), new Class[] { protocol }, |
| new Invoker(protocol, addr, ticket, conf, factory)); |
| if (proxy instanceof VersionedProtocol) { |
| long serverVersion = ((VersionedProtocol)proxy) |
| .getProtocolVersion(protocol.getName(), clientVersion); |
| if (serverVersion != clientVersion) { |
| throw new RPC.VersionMismatch(protocol.getName(), clientVersion, |
| serverVersion); |
| } |
| } |
| return proxy; |
| } |
| |
| /** |
| * Stop this proxy and release its invoker's resource |
| * @param proxy the proxy to be stopped |
| */ |
| public void stopProxy(Object proxy) { |
| ((Invoker)Proxy.getInvocationHandler(proxy)).close(); |
| } |
| |
| |
| /** Expert: Make multiple, parallel calls to a set of servers. */ |
| public Object[] call(Method method, Object[][] params, |
| InetSocketAddress[] addrs, |
| UserGroupInformation ticket, Configuration conf) |
| throws IOException, InterruptedException { |
| |
| Invocation[] invocations = new Invocation[params.length]; |
| for (int i = 0; i < params.length; i++) |
| invocations[i] = new Invocation(method, params[i]); |
| Client client = CLIENTS.getClient(conf); |
| try { |
| Writable[] wrappedValues = |
| client.call(invocations, addrs, method.getDeclaringClass(), ticket); |
| |
| if (method.getReturnType() == Void.TYPE) { |
| return null; |
| } |
| |
| Object[] values = |
| (Object[])Array.newInstance(method.getReturnType(), wrappedValues.length); |
| for (int i = 0; i < values.length; i++) |
| if (wrappedValues[i] != null) |
| values[i] = ((ObjectWritable)wrappedValues[i]).get(); |
| |
| return values; |
| } finally { |
| CLIENTS.stopClient(client); |
| } |
| } |
| |
| /** Construct a server for a protocol implementation instance listening on a |
| * port and address. */ |
| public Server getServer(Class protocol, |
| Object instance, String bindAddress, int port, |
| int numHandlers, boolean verbose, Configuration conf, |
| SecretManager<? extends TokenIdentifier> secretManager) |
| throws IOException { |
| return new Server(instance, conf, bindAddress, port, numHandlers, |
| verbose, secretManager); |
| } |
| |
| /** An RPC Server. */ |
| public static class Server extends RPC.Server { |
| private Object instance; |
| private boolean verbose; |
| |
| /** Construct an RPC server. |
| * @param instance the instance whose methods will be called |
| * @param conf the configuration to use |
| * @param bindAddress the address to bind on to listen for connection |
| * @param port the port to listen for connections on |
| */ |
| public Server(Object instance, Configuration conf, String bindAddress, int port) |
| throws IOException { |
| this(instance, conf, bindAddress, port, 1, false, null); |
| } |
| |
| private static String classNameBase(String className) { |
| String[] names = className.split("\\.", -1); |
| if (names == null || names.length == 0) { |
| return className; |
| } |
| return names[names.length-1]; |
| } |
| |
| /** Construct an RPC server. |
| * @param instance the instance whose methods will be called |
| * @param conf the configuration to use |
| * @param bindAddress the address to bind on to listen for connection |
| * @param port the port to listen for connections on |
| * @param numHandlers the number of method handler threads to run |
| * @param verbose whether each call should be logged |
| */ |
| public Server(Object instance, Configuration conf, String bindAddress, int port, |
| int numHandlers, boolean verbose, |
| SecretManager<? extends TokenIdentifier> secretManager) |
| throws IOException { |
| super(bindAddress, port, Invocation.class, numHandlers, conf, |
| classNameBase(instance.getClass().getName()), secretManager); |
| this.instance = instance; |
| this.verbose = verbose; |
| } |
| |
| public Writable call(Class<?> protocol, Writable param, long receivedTime) |
| throws IOException { |
| try { |
| Invocation call = (Invocation)param; |
| if (verbose) log("Call: " + call); |
| |
| Method method = |
| protocol.getMethod(call.getMethodName(), |
| call.getParameterClasses()); |
| method.setAccessible(true); |
| |
| long startTime = System.currentTimeMillis(); |
| Object value = method.invoke(instance, call.getParameters()); |
| int processingTime = (int) (System.currentTimeMillis() - startTime); |
| int qTime = (int) (startTime-receivedTime); |
| if (LOG.isDebugEnabled()) { |
| LOG.debug("Served: " + call.getMethodName() + |
| " queueTime= " + qTime + |
| " procesingTime= " + processingTime); |
| } |
| rpcMetrics.rpcQueueTime.inc(qTime); |
| rpcMetrics.rpcProcessingTime.inc(processingTime); |
| |
| MetricsTimeVaryingRate m = |
| (MetricsTimeVaryingRate) rpcDetailedMetrics.registry.get(call.getMethodName()); |
| if (m == null) { |
| try { |
| m = new MetricsTimeVaryingRate(call.getMethodName(), |
| rpcDetailedMetrics.registry); |
| } catch (IllegalArgumentException iae) { |
| // the metrics has been registered; re-fetch the handle |
| LOG.info("Error register " + call.getMethodName(), iae); |
| m = (MetricsTimeVaryingRate) rpcDetailedMetrics.registry.get( |
| call.getMethodName()); |
| } |
| } |
| m.inc(processingTime); |
| |
| if (verbose) log("Return: "+value); |
| |
| return new ObjectWritable(method.getReturnType(), value); |
| |
| } catch (InvocationTargetException e) { |
| Throwable target = e.getTargetException(); |
| if (target instanceof IOException) { |
| throw (IOException)target; |
| } else { |
| IOException ioe = new IOException(target.toString()); |
| ioe.setStackTrace(target.getStackTrace()); |
| throw ioe; |
| } |
| } catch (Throwable e) { |
| if (!(e instanceof IOException)) { |
| LOG.error("Unexpected throwable object ", e); |
| } |
| IOException ioe = new IOException(e.toString()); |
| ioe.setStackTrace(e.getStackTrace()); |
| throw ioe; |
| } |
| } |
| } |
| |
| private static void log(String value) { |
| if (value!= null && value.length() > 55) |
| value = value.substring(0, 55)+"..."; |
| LOG.info(value); |
| } |
| } |