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/**
* 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.hdfs;
import java.io.IOException;
import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Proxy;
import java.net.InetSocketAddress;
import java.net.URI;
import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.atomic.AtomicBoolean;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.hdfs.server.namenode.ha.ClientHAProxyFactory;
import org.apache.hadoop.hdfs.server.namenode.ha.HAProxyFactory;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.google.common.annotations.VisibleForTesting;
import com.google.common.base.Preconditions;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hdfs.client.HdfsClientConfigKeys;
import org.apache.hadoop.hdfs.client.impl.DfsClientConf;
import org.apache.hadoop.hdfs.protocol.ClientProtocol;
import org.apache.hadoop.hdfs.protocol.HdfsConstants;
import org.apache.hadoop.hdfs.protocolPB.ClientNamenodeProtocolPB;
import org.apache.hadoop.hdfs.protocolPB.ClientNamenodeProtocolTranslatorPB;
import org.apache.hadoop.hdfs.server.namenode.SafeModeException;
import org.apache.hadoop.hdfs.server.namenode.ha.AbstractNNFailoverProxyProvider;
import org.apache.hadoop.hdfs.server.namenode.ha.WrappedFailoverProxyProvider;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.io.retry.DefaultFailoverProxyProvider;
import org.apache.hadoop.io.retry.FailoverProxyProvider;
import org.apache.hadoop.io.retry.LossyRetryInvocationHandler;
import org.apache.hadoop.io.retry.RetryPolicies;
import org.apache.hadoop.io.retry.RetryPolicy;
import org.apache.hadoop.io.retry.RetryProxy;
import org.apache.hadoop.io.retry.RetryUtils;
import org.apache.hadoop.ipc.ProtobufRpcEngine;
import org.apache.hadoop.ipc.RPC;
import org.apache.hadoop.net.NetUtils;
import org.apache.hadoop.security.SecurityUtil;
import org.apache.hadoop.security.UserGroupInformation;
/**
* Create proxy objects with {@link ClientProtocol} to communicate with a remote
* NN. Generally use {@link NameNodeProxiesClient#createProxyWithClientProtocol(
* Configuration, URI, AtomicBoolean)}, which will create either an HA- or
* non-HA-enabled client proxy as appropriate.
*
* For creating proxy objects with other protocols, please see
* NameNodeProxies#createProxy(Configuration, URI, Class).
*/
@InterfaceAudience.Private
public class NameNodeProxiesClient {
private static final Logger LOG = LoggerFactory.getLogger(
NameNodeProxiesClient.class);
/**
* Wrapper for a client proxy as well as its associated service ID.
* This is simply used as a tuple-like return type for created NN proxy.
*/
public static class ProxyAndInfo {
private final PROXYTYPE proxy;
private final Text dtService;
private final InetSocketAddress address;
public ProxyAndInfo(PROXYTYPE proxy, Text dtService,
InetSocketAddress address) {
this.proxy = proxy;
this.dtService = dtService;
this.address = address;
}
public PROXYTYPE getProxy() {
return proxy;
}
public Text getDelegationTokenService() {
return dtService;
}
public InetSocketAddress getAddress() {
return address;
}
}
/**
* Creates the namenode proxy with the ClientProtocol. This will handle
* creation of either HA- or non-HA-enabled proxy objects, depending upon
* if the provided URI is a configured logical URI.
*
* @param conf the configuration containing the required IPC
* properties, client failover configurations, etc.
* @param nameNodeUri the URI pointing either to a specific NameNode
* or to a logical nameservice.
* @param fallbackToSimpleAuth set to true or false during calls to indicate
* if a secure client falls back to simple auth
* @return an object containing both the proxy and the associated
* delegation token service it corresponds to
* @throws IOException if there is an error creating the proxy
*/
public static ProxyAndInfo createProxyWithClientProtocol(
Configuration conf, URI nameNodeUri, AtomicBoolean fallbackToSimpleAuth)
throws IOException {
AbstractNNFailoverProxyProvider failoverProxyProvider =
createFailoverProxyProvider(conf, nameNodeUri, ClientProtocol.class,
true, fallbackToSimpleAuth);
if (failoverProxyProvider == null) {
InetSocketAddress nnAddr = DFSUtilClient.getNNAddress(nameNodeUri);
Text dtService = SecurityUtil.buildTokenService(nnAddr);
ClientProtocol proxy = createNonHAProxyWithClientProtocol(nnAddr, conf,
UserGroupInformation.getCurrentUser(), true, fallbackToSimpleAuth);
return new ProxyAndInfo<>(proxy, dtService, nnAddr);
} else {
return createHAProxy(conf, nameNodeUri, ClientProtocol.class,
failoverProxyProvider);
}
}
/**
* Generate a dummy namenode proxy instance that utilizes our hacked
* {@link LossyRetryInvocationHandler}. Proxy instance generated using this
* method will proactively drop RPC responses. Currently this method only
* support HA setup. null will be returned if the given configuration is not
* for HA.
*
* @param config the configuration containing the required IPC
* properties, client failover configurations, etc.
* @param nameNodeUri the URI pointing either to a specific NameNode
* or to a logical nameservice.
* @param xface the IPC interface which should be created
* @param numResponseToDrop The number of responses to drop for each RPC call
* @param fallbackToSimpleAuth set to true or false during calls to indicate
* if a secure client falls back to simple auth
* @return an object containing both the proxy and the associated
* delegation token service it corresponds to. Will return null of the
* given configuration does not support HA.
* @throws IOException if there is an error creating the proxy
*/
public static ProxyAndInfo createProxyWithLossyRetryHandler(
Configuration config, URI nameNodeUri, Class xface,
int numResponseToDrop, AtomicBoolean fallbackToSimpleAuth)
throws IOException {
Preconditions.checkArgument(numResponseToDrop > 0);
AbstractNNFailoverProxyProvider failoverProxyProvider =
createFailoverProxyProvider(config, nameNodeUri, xface, true,
fallbackToSimpleAuth);
if (failoverProxyProvider != null) { // HA case
int delay = config.getInt(
HdfsClientConfigKeys.Failover.SLEEPTIME_BASE_KEY,
HdfsClientConfigKeys.Failover.SLEEPTIME_BASE_DEFAULT);
int maxCap = config.getInt(
HdfsClientConfigKeys.Failover.SLEEPTIME_MAX_KEY,
HdfsClientConfigKeys.Failover.SLEEPTIME_MAX_DEFAULT);
int maxFailoverAttempts = config.getInt(
HdfsClientConfigKeys.Failover.MAX_ATTEMPTS_KEY,
HdfsClientConfigKeys.Failover.MAX_ATTEMPTS_DEFAULT);
int maxRetryAttempts = config.getInt(
HdfsClientConfigKeys.Retry.MAX_ATTEMPTS_KEY,
HdfsClientConfigKeys.Retry.MAX_ATTEMPTS_DEFAULT);
InvocationHandler dummyHandler = new LossyRetryInvocationHandler<>(
numResponseToDrop, failoverProxyProvider,
RetryPolicies.failoverOnNetworkException(
RetryPolicies.TRY_ONCE_THEN_FAIL, maxFailoverAttempts,
Math.max(numResponseToDrop + 1, maxRetryAttempts), delay,
maxCap));
@SuppressWarnings("unchecked")
T proxy = (T) Proxy.newProxyInstance(
failoverProxyProvider.getInterface().getClassLoader(),
new Class[]{xface}, dummyHandler);
Text dtService;
if (failoverProxyProvider.useLogicalURI()) {
dtService = HAUtilClient.buildTokenServiceForLogicalUri(nameNodeUri,
HdfsConstants.HDFS_URI_SCHEME);
} else {
dtService = SecurityUtil.buildTokenService(
DFSUtilClient.getNNAddress(nameNodeUri));
}
return new ProxyAndInfo<>(proxy, dtService,
DFSUtilClient.getNNAddress(nameNodeUri));
} else {
LOG.warn("Currently creating proxy using " +
"LossyRetryInvocationHandler requires NN HA setup");
return null;
}
}
/** Creates the Failover proxy provider instance*/
@VisibleForTesting
public static AbstractNNFailoverProxyProvider createFailoverProxyProvider(
Configuration conf, URI nameNodeUri, Class xface, boolean checkPort,
AtomicBoolean fallbackToSimpleAuth) throws IOException {
return createFailoverProxyProvider(conf, nameNodeUri, xface, checkPort,
fallbackToSimpleAuth, new ClientHAProxyFactory());
}
protected static AbstractNNFailoverProxyProvider createFailoverProxyProvider(
Configuration conf, URI nameNodeUri, Class xface, boolean checkPort,
AtomicBoolean fallbackToSimpleAuth, HAProxyFactory proxyFactory)
throws IOException {
Class> failoverProxyProviderClass = null;
AbstractNNFailoverProxyProvider providerNN;
try {
// Obtain the class of the proxy provider
failoverProxyProviderClass = getFailoverProxyProviderClass(conf,
nameNodeUri);
if (failoverProxyProviderClass == null) {
return null;
}
// Create a proxy provider instance.
Constructor> ctor = failoverProxyProviderClass
.getConstructor(Configuration.class, URI.class,
Class.class, HAProxyFactory.class);
FailoverProxyProvider provider = ctor.newInstance(conf, nameNodeUri,
xface, proxyFactory);
// If the proxy provider is of an old implementation, wrap it.
if (!(provider instanceof AbstractNNFailoverProxyProvider)) {
providerNN = new WrappedFailoverProxyProvider<>(provider);
} else {
providerNN = (AbstractNNFailoverProxyProvider)provider;
}
} catch (Exception e) {
final String message = "Couldn't create proxy provider " +
failoverProxyProviderClass;
LOG.debug(message, e);
if (e.getCause() instanceof IOException) {
throw (IOException) e.getCause();
} else {
throw new IOException(message, e);
}
}
// Check the port in the URI, if it is logical.
if (checkPort && providerNN.useLogicalURI()) {
int port = nameNodeUri.getPort();
if (port > 0 &&
port != HdfsClientConfigKeys.DFS_NAMENODE_RPC_PORT_DEFAULT) {
// Throwing here without any cleanup is fine since we have not
// actually created the underlying proxies yet.
throw new IOException("Port " + port + " specified in URI "
+ nameNodeUri + " but host '" + nameNodeUri.getHost()
+ "' is a logical (HA) namenode"
+ " and does not use port information.");
}
}
providerNN.setFallbackToSimpleAuth(fallbackToSimpleAuth);
return providerNN;
}
/** Gets the configured Failover proxy provider's class */
@VisibleForTesting
public static Class> getFailoverProxyProviderClass(
Configuration conf, URI nameNodeUri) throws IOException {
if (nameNodeUri == null) {
return null;
}
String host = nameNodeUri.getHost();
String configKey = HdfsClientConfigKeys.Failover.PROXY_PROVIDER_KEY_PREFIX
+ "." + host;
try {
@SuppressWarnings("unchecked")
Class> ret = (Class>)
conf.getClass(configKey, null, FailoverProxyProvider.class);
return ret;
} catch (RuntimeException e) {
if (e.getCause() instanceof ClassNotFoundException) {
throw new IOException("Could not load failover proxy provider class "
+ conf.get(configKey) + " which is configured for authority "
+ nameNodeUri, e);
} else {
throw e;
}
}
}
/**
* Creates an explicitly HA-enabled proxy object.
*
* @param conf the configuration object
* @param nameNodeUri the URI pointing either to a specific NameNode or to a
* logical nameservice.
* @param xface the IPC interface which should be created
* @param failoverProxyProvider Failover proxy provider
* @return an object containing both the proxy and the associated
* delegation token service it corresponds to
*/
@SuppressWarnings("unchecked")
public static ProxyAndInfo createHAProxy(
Configuration conf, URI nameNodeUri, Class xface,
AbstractNNFailoverProxyProvider failoverProxyProvider) {
Preconditions.checkNotNull(failoverProxyProvider);
// HA case
DfsClientConf config = new DfsClientConf(conf);
T proxy = (T) RetryProxy.create(xface, failoverProxyProvider,
RetryPolicies.failoverOnNetworkException(
RetryPolicies.TRY_ONCE_THEN_FAIL, config.getMaxFailoverAttempts(),
config.getMaxRetryAttempts(), config.getFailoverSleepBaseMillis(),
config.getFailoverSleepMaxMillis()));
Text dtService;
if (failoverProxyProvider.useLogicalURI()) {
dtService = HAUtilClient.buildTokenServiceForLogicalUri(nameNodeUri,
HdfsConstants.HDFS_URI_SCHEME);
} else {
dtService = SecurityUtil.buildTokenService(
DFSUtilClient.getNNAddress(nameNodeUri));
}
return new ProxyAndInfo<>(proxy, dtService,
DFSUtilClient.getNNAddressCheckLogical(conf, nameNodeUri));
}
public static ClientProtocol createNonHAProxyWithClientProtocol(
InetSocketAddress address, Configuration conf, UserGroupInformation ugi,
boolean withRetries, AtomicBoolean fallbackToSimpleAuth)
throws IOException {
RPC.setProtocolEngine(conf, ClientNamenodeProtocolPB.class,
ProtobufRpcEngine.class);
final RetryPolicy defaultPolicy =
RetryUtils.getDefaultRetryPolicy(
conf,
HdfsClientConfigKeys.Retry.POLICY_ENABLED_KEY,
HdfsClientConfigKeys.Retry.POLICY_ENABLED_DEFAULT,
HdfsClientConfigKeys.Retry.POLICY_SPEC_KEY,
HdfsClientConfigKeys.Retry.POLICY_SPEC_DEFAULT,
SafeModeException.class.getName());
final long version = RPC.getProtocolVersion(ClientNamenodeProtocolPB.class);
ClientNamenodeProtocolPB proxy = RPC.getProtocolProxy(
ClientNamenodeProtocolPB.class, version, address, ugi, conf,
NetUtils.getDefaultSocketFactory(conf),
org.apache.hadoop.ipc.Client.getTimeout(conf), defaultPolicy,
fallbackToSimpleAuth).getProxy();
if (withRetries) { // create the proxy with retries
Map methodNameToPolicyMap = new HashMap<>();
ClientProtocol translatorProxy =
new ClientNamenodeProtocolTranslatorPB(proxy);
return (ClientProtocol) RetryProxy.create(
ClientProtocol.class,
new DefaultFailoverProxyProvider<>(ClientProtocol.class,
translatorProxy),
methodNameToPolicyMap,
defaultPolicy);
} else {
return new ClientNamenodeProtocolTranslatorPB(proxy);
}
}
}
