HADOOP-7474. Refactor ClientCache out of WritableRpcEngine. Contributed by jitendra.
git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1151978 13f79535-47bb-0310-9956-ffa450edef68
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@ -292,6 +292,8 @@ Trunk (unreleased changes)
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HADOOP-7378. Add -d option to ls to not expand directories.
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(Daryn Sharp via suresh)
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HADOOP-7474. Refactor ClientCache out of WritableRpcEngine. (jitendra)
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OPTIMIZATIONS
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HADOOP-7333. Performance improvement in PureJavaCrc32. (Eric Caspole
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@ -1195,7 +1195,9 @@ private Connection getConnection(ConnectionId remoteId,
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* This class holds the address and the user ticket. The client connections
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* to servers are uniquely identified by <remoteAddress, protocol, ticket>
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*/
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static class ConnectionId {
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@InterfaceAudience.LimitedPrivate({"HDFS", "MapReduce"})
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@InterfaceStability.Evolving
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public static class ConnectionId {
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InetSocketAddress address;
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UserGroupInformation ticket;
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Class<?> protocol;
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@ -1266,7 +1268,17 @@ int getPingInterval() {
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return pingInterval;
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}
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static ConnectionId getConnectionId(InetSocketAddress addr,
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/**
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* Returns a ConnectionId object.
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* @param addr Remote address for the connection.
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* @param protocol Protocol for RPC.
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* @param ticket UGI
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* @param rpcTimeout timeout
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* @param conf Configuration object
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* @return A ConnectionId instance
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* @throws IOException
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*/
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public static ConnectionId getConnectionId(InetSocketAddress addr,
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Class<?> protocol, UserGroupInformation ticket, int rpcTimeout,
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Configuration conf) throws IOException {
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String remotePrincipal = getRemotePrincipal(conf, addr, protocol);
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103
common/src/java/org/apache/hadoop/ipc/ClientCache.java
Normal file
103
common/src/java/org/apache/hadoop/ipc/ClientCache.java
Normal file
@ -0,0 +1,103 @@
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/**
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* Licensed to the Apache Software Foundation (ASF) under one
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* or more contributor license agreements. See the NOTICE file
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* distributed with this work for additional information
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* regarding copyright ownership. The ASF licenses this file
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* to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.apache.hadoop.ipc;
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import java.util.HashMap;
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import java.util.Map;
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import javax.net.SocketFactory;
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import org.apache.hadoop.classification.InterfaceAudience;
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import org.apache.hadoop.classification.InterfaceStability;
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import org.apache.hadoop.conf.Configuration;
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import org.apache.hadoop.io.ObjectWritable;
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import org.apache.hadoop.io.Writable;
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/* Cache a client using its socket factory as the hash key */
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@InterfaceAudience.LimitedPrivate({"HDFS", "MapReduce"})
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@InterfaceStability.Evolving
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public class ClientCache {
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private Map<SocketFactory, Client> clients =
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new HashMap<SocketFactory, Client>();
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/**
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* Construct & cache an IPC client with the user-provided SocketFactory
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* if no cached client exists.
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*
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* @param conf Configuration
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* @param factory SocketFactory for client socket
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* @param valueClass Class of the expected response
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* @return an IPC client
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*/
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public synchronized Client getClient(Configuration conf,
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SocketFactory factory, Class<? extends Writable> valueClass) {
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// Construct & cache client. The configuration is only used for timeout,
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// and Clients have connection pools. So we can either (a) lose some
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// connection pooling and leak sockets, or (b) use the same timeout for all
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// configurations. Since the IPC is usually intended globally, not
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// per-job, we choose (a).
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Client client = clients.get(factory);
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if (client == null) {
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client = new Client(valueClass, conf, factory);
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clients.put(factory, client);
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} else {
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client.incCount();
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}
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return client;
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}
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/**
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* Construct & cache an IPC client with the default SocketFactory
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* and default valueClass if no cached client exists.
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*
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* @param conf Configuration
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* @return an IPC client
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*/
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public synchronized Client getClient(Configuration conf) {
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return getClient(conf, SocketFactory.getDefault(), ObjectWritable.class);
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}
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/**
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* Construct & cache an IPC client with the user-provided SocketFactory
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* if no cached client exists. Default response type is ObjectWritable.
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*
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* @param conf Configuration
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* @param factory SocketFactory for client socket
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* @return an IPC client
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*/
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public synchronized Client getClient(Configuration conf, SocketFactory factory) {
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return this.getClient(conf, factory, ObjectWritable.class);
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}
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/**
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* Stop a RPC client connection
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* A RPC client is closed only when its reference count becomes zero.
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*/
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public void stopClient(Client client) {
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synchronized (this) {
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client.decCount();
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if (client.isZeroReference()) {
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clients.remove(client.getSocketFactory());
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}
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}
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if (client.isZeroReference()) {
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client.stop();
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}
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}
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}
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@ -167,63 +167,6 @@ public Configuration getConf() {
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}
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/* Cache a client using its socket factory as the hash key */
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static private class ClientCache {
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private Map<SocketFactory, Client> clients =
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new HashMap<SocketFactory, Client>();
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/**
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* Construct & cache an IPC client with the user-provided SocketFactory
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* if no cached client exists.
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*
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* @param conf Configuration
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* @return an IPC client
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*/
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private synchronized Client getClient(Configuration conf,
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SocketFactory factory) {
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// Construct & cache client. The configuration is only used for timeout,
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// and Clients have connection pools. So we can either (a) lose some
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// connection pooling and leak sockets, or (b) use the same timeout for all
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// configurations. Since the IPC is usually intended globally, not
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// per-job, we choose (a).
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Client client = clients.get(factory);
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if (client == null) {
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client = new Client(ObjectWritable.class, conf, factory);
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clients.put(factory, client);
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} else {
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client.incCount();
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}
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return client;
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}
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/**
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* Construct & cache an IPC client with the default SocketFactory
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* if no cached client exists.
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*
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* @param conf Configuration
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* @return an IPC client
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*/
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private synchronized Client getClient(Configuration conf) {
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return getClient(conf, SocketFactory.getDefault());
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}
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/**
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* Stop a RPC client connection
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* A RPC client is closed only when its reference count becomes zero.
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*/
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private void stopClient(Client client) {
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synchronized (this) {
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client.decCount();
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if (client.isZeroReference()) {
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clients.remove(client.getSocketFactory());
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}
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}
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if (client.isZeroReference()) {
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client.stop();
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}
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}
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}
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private static ClientCache CLIENTS=new ClientCache();
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private static class Invoker implements InvocationHandler {
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