/**
* 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.hbase.ipc;
import static org.apache.hadoop.hbase.ipc.IPCUtil.toIOE;
import static org.apache.hadoop.hbase.ipc.IPCUtil.wrapException;
import com.google.common.annotations.VisibleForTesting;
import com.google.common.base.Preconditions;
import com.google.common.cache.CacheBuilder;
import com.google.common.cache.CacheLoader;
import com.google.common.cache.LoadingCache;
import org.apache.hadoop.hbase.shaded.com.google.protobuf.BlockingRpcChannel;
import org.apache.hadoop.hbase.shaded.com.google.protobuf.Descriptors;
import org.apache.hadoop.hbase.shaded.com.google.protobuf.Message;
import org.apache.hadoop.hbase.shaded.com.google.protobuf.RpcChannel;
import org.apache.hadoop.hbase.shaded.com.google.protobuf.RpcController;
import org.apache.hadoop.hbase.shaded.com.google.protobuf.ServiceException;
import org.apache.hadoop.hbase.shaded.com.google.protobuf.RpcCallback;
import io.netty.util.HashedWheelTimer;
import java.io.IOException;
import java.net.InetSocketAddress;
import java.net.SocketAddress;
import java.net.UnknownHostException;
import java.util.Collection;
import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.Executors;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.ScheduledFuture;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicInteger;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hbase.HConstants;
import org.apache.hadoop.hbase.ServerName;
import org.apache.hadoop.hbase.classification.InterfaceAudience;
import org.apache.hadoop.hbase.client.MetricsConnection;
import org.apache.hadoop.hbase.codec.Codec;
import org.apache.hadoop.hbase.codec.KeyValueCodec;
import org.apache.hadoop.hbase.protobuf.generated.AuthenticationProtos.TokenIdentifier.Kind;
import org.apache.hadoop.hbase.security.User;
import org.apache.hadoop.hbase.security.UserProvider;
import org.apache.hadoop.hbase.security.token.AuthenticationTokenSelector;
import org.apache.hadoop.hbase.util.EnvironmentEdgeManager;
import org.apache.hadoop.hbase.util.PoolMap;
import org.apache.hadoop.hbase.util.Threads;
import org.apache.hadoop.io.compress.CompressionCodec;
import org.apache.hadoop.ipc.RemoteException;
import org.apache.hadoop.security.token.TokenIdentifier;
import org.apache.hadoop.security.token.TokenSelector;
/**
* Provides the basics for a RpcClient implementation like configuration and Logging.
* <p>
* Locking schema of the current IPC implementation
* <ul>
* <li>There is a lock in {@link AbstractRpcClient} to protect the fetching or creating
* connection.</li>
* <li>There is a lock in {@link Call} to make sure that we can only finish the call once.</li>
* <li>The same for {@link HBaseRpcController} as {@link Call}. And see the comment of
* {@link HBaseRpcController#notifyOnCancel(RpcCallback, HBaseRpcController.CancellationCallback)}
* of how to deal with cancel.</li>
* <li>For connection implementation, the construction of a connection should be as fast as possible
* because the creation is protected under a lock. Connect to remote side when needed. There is no
* forced locking schema for a connection implementation.</li>
* <li>For the locking order, the {@link Call} and {@link HBaseRpcController}'s lock should be held
* at last. So the callbacks in {@link Call} and {@link HBaseRpcController} should be execute
* outside the lock in {@link Call} and {@link HBaseRpcController} which means the implementations
* of the callbacks are free to hold any lock.</li>
* </ul>
*/
@InterfaceAudience.Private
public abstract class AbstractRpcClient<T extends RpcConnection> implements RpcClient {
// Log level is being changed in tests
public static final Log LOG = LogFactory.getLog(AbstractRpcClient.class);
protected static final HashedWheelTimer WHEEL_TIMER = new HashedWheelTimer(
Threads.newDaemonThreadFactory("RpcClient-timer"), 10, TimeUnit.MILLISECONDS);
private static final ScheduledExecutorService IDLE_CONN_SWEEPER = Executors
.newScheduledThreadPool(1, Threads.newDaemonThreadFactory("Idle-Rpc-Conn-Sweeper"));
protected final static Map<Kind, TokenSelector<? extends TokenIdentifier>> TOKEN_HANDLERS = new HashMap<>();
static {
TOKEN_HANDLERS.put(Kind.HBASE_AUTH_TOKEN, new AuthenticationTokenSelector());
}
protected boolean running = true; // if client runs
protected final Configuration conf;
protected final String clusterId;
protected final SocketAddress localAddr;
protected final MetricsConnection metrics;
protected final UserProvider userProvider;
protected final CellBlockBuilder cellBlockBuilder;
protected final int minIdleTimeBeforeClose; // if the connection is idle for more than this
// time (in ms), it will be closed at any moment.
protected final int maxRetries; // the max. no. of retries for socket connections
protected final long failureSleep; // Time to sleep before retry on failure.
protected final boolean tcpNoDelay; // if T then disable Nagle's Algorithm
protected final boolean tcpKeepAlive; // if T then use keepalives
protected final Codec codec;
protected final CompressionCodec compressor;
protected final boolean fallbackAllowed;
protected final FailedServers failedServers;
protected final int connectTO;
protected final int readTO;
protected final int writeTO;
protected final PoolMap<ConnectionId, T> connections;
private final AtomicInteger callIdCnt = new AtomicInteger(0);
private final ScheduledFuture<?> cleanupIdleConnectionTask;
private int maxConcurrentCallsPerServer;
private static final LoadingCache<InetSocketAddress, AtomicInteger> concurrentCounterCache =
CacheBuilder.newBuilder().expireAfterAccess(1, TimeUnit.HOURS).
build(new CacheLoader<InetSocketAddress, AtomicInteger>() {
@Override public AtomicInteger load(InetSocketAddress key) throws Exception {
return new AtomicInteger(0);
}
});
/**
* Construct an IPC client for the cluster <code>clusterId</code>
* @param conf configuration
* @param clusterId the cluster id
* @param localAddr client socket bind address.
* @param metrics the connection metrics
*/
public AbstractRpcClient(Configuration conf, String clusterId, SocketAddress localAddr,
MetricsConnection metrics) {
this.userProvider = UserProvider.instantiate(conf);
this.localAddr = localAddr;
this.tcpKeepAlive = conf.getBoolean("hbase.ipc.client.tcpkeepalive", true);
this.clusterId = clusterId != null ? clusterId : HConstants.CLUSTER_ID_DEFAULT;
this.failureSleep = conf.getLong(HConstants.HBASE_CLIENT_PAUSE,
HConstants.DEFAULT_HBASE_CLIENT_PAUSE);
this.maxRetries = conf.getInt("hbase.ipc.client.connect.max.retries", 0);
this.tcpNoDelay = conf.getBoolean("hbase.ipc.client.tcpnodelay", true);
this.cellBlockBuilder = new CellBlockBuilder(conf);
this.minIdleTimeBeforeClose = conf.getInt(IDLE_TIME, 120000); // 2 minutes
this.conf = conf;
this.codec = getCodec();
this.compressor = getCompressor(conf);
this.fallbackAllowed = conf.getBoolean(IPC_CLIENT_FALLBACK_TO_SIMPLE_AUTH_ALLOWED_KEY,
IPC_CLIENT_FALLBACK_TO_SIMPLE_AUTH_ALLOWED_DEFAULT);
this.failedServers = new FailedServers(conf);
this.connectTO = conf.getInt(SOCKET_TIMEOUT_CONNECT, DEFAULT_SOCKET_TIMEOUT_CONNECT);
this.readTO = conf.getInt(SOCKET_TIMEOUT_READ, DEFAULT_SOCKET_TIMEOUT_READ);
this.writeTO = conf.getInt(SOCKET_TIMEOUT_WRITE, DEFAULT_SOCKET_TIMEOUT_WRITE);
this.metrics = metrics;
this.maxConcurrentCallsPerServer = conf.getInt(
HConstants.HBASE_CLIENT_PERSERVER_REQUESTS_THRESHOLD,
HConstants.DEFAULT_HBASE_CLIENT_PERSERVER_REQUESTS_THRESHOLD);
this.connections = new PoolMap<>(getPoolType(conf), getPoolSize(conf));
this.cleanupIdleConnectionTask = IDLE_CONN_SWEEPER.scheduleAtFixedRate(new Runnable() {
@Override
public void run() {
cleanupIdleConnections();
}
}, minIdleTimeBeforeClose, minIdleTimeBeforeClose, TimeUnit.MILLISECONDS);
if (LOG.isDebugEnabled()) {
LOG.debug("Codec=" + this.codec + ", compressor=" + this.compressor + ", tcpKeepAlive="
+ this.tcpKeepAlive + ", tcpNoDelay=" + this.tcpNoDelay + ", connectTO=" + this.connectTO
+ ", readTO=" + this.readTO + ", writeTO=" + this.writeTO + ", minIdleTimeBeforeClose="
+ this.minIdleTimeBeforeClose + ", maxRetries=" + this.maxRetries + ", fallbackAllowed="
+ this.fallbackAllowed + ", bind address="
+ (this.localAddr != null ? this.localAddr : "null"));
}
}
private void cleanupIdleConnections() {
long closeBeforeTime = EnvironmentEdgeManager.currentTime() - minIdleTimeBeforeClose;
synchronized (connections) {
for (T conn : connections.values()) {
// Remove connection if it has not been chosen by anyone for more than maxIdleTime, and the
// connection itself has already shutdown. The latter check is because we may still
// have some pending calls on connection so we should not shutdown the connection outside.
// The connection itself will disconnect if there is no pending call for maxIdleTime.
if (conn.getLastTouched() < closeBeforeTime && !conn.isActive()) {
if (LOG.isTraceEnabled()) LOG.trace("Cleanup idle connection to " + conn.remoteId().address);
connections.removeValue(conn.remoteId(), conn);
conn.cleanupConnection();
}
}
}
}
@VisibleForTesting
public static String getDefaultCodec(final Configuration c) {
// If "hbase.client.default.rpc.codec" is empty string -- you can't set it to null because
// Configuration will complain -- then no default codec (and we'll pb everything). Else
// default is KeyValueCodec
return c.get(DEFAULT_CODEC_CLASS, KeyValueCodec.class.getCanonicalName());
}
/**
* Encapsulate the ugly casting and RuntimeException conversion in private method.
* @return Codec to use on this client.
*/
Codec getCodec() {
// For NO CODEC, "hbase.client.rpc.codec" must be configured with empty string AND
// "hbase.client.default.rpc.codec" also -- because default is to do cell block encoding.
String className = conf.get(HConstants.RPC_CODEC_CONF_KEY, getDefaultCodec(this.conf));
if (className == null || className.length() == 0) {
return null;
}
try {
return (Codec) Class.forName(className).newInstance();
} catch (Exception e) {
throw new RuntimeException("Failed getting codec " + className, e);
}
}
@Override
public boolean hasCellBlockSupport() {
return this.codec != null;
}
// for writing tests that want to throw exception when connecting.
@VisibleForTesting
boolean isTcpNoDelay() {
return tcpNoDelay;
}
/**
* Encapsulate the ugly casting and RuntimeException conversion in private method.
* @param conf configuration
* @return The compressor to use on this client.
*/
private static CompressionCodec getCompressor(final Configuration conf) {
String className = conf.get("hbase.client.rpc.compressor", null);
if (className == null || className.isEmpty()) {
return null;
}
try {
return (CompressionCodec) Class.forName(className).newInstance();
} catch (Exception e) {
throw new RuntimeException("Failed getting compressor " + className, e);
}
}
/**
* Return the pool type specified in the configuration, which must be set to either
* {@link org.apache.hadoop.hbase.util.PoolMap.PoolType#RoundRobin} or
* {@link org.apache.hadoop.hbase.util.PoolMap.PoolType#ThreadLocal}, otherwise default to the
* former. For applications with many user threads, use a small round-robin pool. For applications
* with few user threads, you may want to try using a thread-local pool. In any case, the number
* of {@link org.apache.hadoop.hbase.ipc.RpcClient} instances should not exceed the operating
* system's hard limit on the number of connections.
* @param config configuration
* @return either a {@link org.apache.hadoop.hbase.util.PoolMap.PoolType#RoundRobin} or
* {@link org.apache.hadoop.hbase.util.PoolMap.PoolType#ThreadLocal}
*/
private static PoolMap.PoolType getPoolType(Configuration config) {
return PoolMap.PoolType.valueOf(config.get(HConstants.HBASE_CLIENT_IPC_POOL_TYPE),
PoolMap.PoolType.RoundRobin, PoolMap.PoolType.ThreadLocal);
}
/**
* Return the pool size specified in the configuration, which is applicable only if the pool type
* is {@link org.apache.hadoop.hbase.util.PoolMap.PoolType#RoundRobin}.
* @param config configuration
* @return the maximum pool size
*/
private static int getPoolSize(Configuration config) {
return config.getInt(HConstants.HBASE_CLIENT_IPC_POOL_SIZE, 1);
}
private int nextCallId() {
int id, next;
do {
id = callIdCnt.get();
next = id < Integer.MAX_VALUE ? id + 1 : 0;
} while (!callIdCnt.compareAndSet(id, next));
return id;
}
/**
* Make a blocking call. Throws exceptions if there are network problems or if the remote code
* threw an exception.
* @param ticket Be careful which ticket you pass. A new user will mean a new Connection.
* {@link UserProvider#getCurrent()} makes a new instance of User each time so will be a
* new Connection each time.
* @return A pair with the Message response and the Cell data (if any).
*/
private Message callBlockingMethod(Descriptors.MethodDescriptor md, HBaseRpcController hrc,
Message param, Message returnType, final User ticket, final InetSocketAddress isa)
throws ServiceException {
BlockingRpcCallback<Message> done = new BlockingRpcCallback<>();
callMethod(md, hrc, param, returnType, ticket, isa, done);
Message val;
try {
val = done.get();
} catch (IOException e) {
throw new ServiceException(e);
}
if (hrc.failed()) {
throw new ServiceException(hrc.getFailed());
} else {
return val;
}
}
/**
* Get a connection from the pool, or create a new one and add it to the pool. Connections to a
* given host/port are reused.
*/
private T getConnection(ConnectionId remoteId) throws IOException {
if (failedServers.isFailedServer(remoteId.getAddress())) {
if (LOG.isDebugEnabled()) {
LOG.debug("Not trying to connect to " + remoteId.address
+ " this server is in the failed servers list");
}
throw new FailedServerException(
"This server is in the failed servers list: " + remoteId.address);
}
T conn;
synchronized (connections) {
if (!running) {
throw new StoppedRpcClientException();
}
conn = connections.get(remoteId);
if (conn == null) {
conn = createConnection(remoteId);
connections.put(remoteId, conn);
}
conn.setLastTouched(EnvironmentEdgeManager.currentTime());
}
return conn;
}
/**
* Not connected.
*/
protected abstract T createConnection(ConnectionId remoteId) throws IOException;
private void onCallFinished(Call call, HBaseRpcController hrc, InetSocketAddress addr,
RpcCallback<Message> callback) {
call.callStats.setCallTimeMs(EnvironmentEdgeManager.currentTime() - call.getStartTime());
if (metrics != null) {
metrics.updateRpc(call.md, call.param, call.callStats);
}
if (LOG.isTraceEnabled()) {
LOG.trace(
"Call: " + call.md.getName() + ", callTime: " + call.callStats.getCallTimeMs() + "ms");
}
if (call.error != null) {
if (call.error instanceof RemoteException) {
call.error.fillInStackTrace();
hrc.setFailed(call.error);
} else {
hrc.setFailed(wrapException(addr, call.error));
}
callback.run(null);
} else {
hrc.setDone(call.cells);
callback.run(call.response);
}
}
private void callMethod(final Descriptors.MethodDescriptor md, final HBaseRpcController hrc,
final Message param, Message returnType, final User ticket, final InetSocketAddress addr,
final RpcCallback<Message> callback) {
final MetricsConnection.CallStats cs = MetricsConnection.newCallStats();
cs.setStartTime(EnvironmentEdgeManager.currentTime());
final AtomicInteger counter = concurrentCounterCache.getUnchecked(addr);
Call call = new Call(nextCallId(), md, param, hrc.cellScanner(), returnType,
hrc.getCallTimeout(), hrc.getPriority(), new RpcCallback<Call>() {
@Override
public void run(Call call) {
counter.decrementAndGet();
onCallFinished(call, hrc, addr, callback);
}
}, cs);
ConnectionId remoteId = new ConnectionId(ticket, md.getService().getName(), addr);
int count = counter.incrementAndGet();
try {
if (count > maxConcurrentCallsPerServer) {
throw new ServerTooBusyException(addr, count);
}
T connection = getConnection(remoteId);
connection.sendRequest(call, hrc);
} catch (Exception e) {
call.setException(toIOE(e));
}
}
private InetSocketAddress createAddr(ServerName sn) throws UnknownHostException {
InetSocketAddress addr = new InetSocketAddress(sn.getHostname(), sn.getPort());
if (addr.isUnresolved()) {
throw new UnknownHostException("can not resolve " + sn.getServerName());
}
return addr;
}
/**
* Interrupt the connections to the given ip:port server. This should be called if the server is
* known as actually dead. This will not prevent current operation to be retried, and, depending
* on their own behavior, they may retry on the same server. This can be a feature, for example at
* startup. In any case, they're likely to get connection refused (if the process died) or no
* route to host: i.e. their next retries should be faster and with a safe exception.
*/
@Override
public void cancelConnections(ServerName sn) {
synchronized (connections) {
for (T connection : connections.values()) {
ConnectionId remoteId = connection.remoteId();
if (remoteId.address.getPort() == sn.getPort()
&& remoteId.address.getHostName().equals(sn.getHostname())) {
LOG.info("The server on " + sn.toString() + " is dead - stopping the connection "
+ connection.remoteId);
connections.removeValue(remoteId, connection);
connection.shutdown();
}
}
}
}
/**
* Configure an hbase rpccontroller
* @param controller to configure
* @param channelOperationTimeout timeout for operation
* @return configured controller
*/
static HBaseRpcController configureHBaseRpcController(
RpcController controller, int channelOperationTimeout) {
HBaseRpcController hrc;
if (controller != null && controller instanceof HBaseRpcController) {
hrc = (HBaseRpcController) controller;
if (!hrc.hasCallTimeout()) {
hrc.setCallTimeout(channelOperationTimeout);
}
} else {
hrc = new HBaseRpcControllerImpl();
hrc.setCallTimeout(channelOperationTimeout);
}
return hrc;
}
protected abstract void closeInternal();
@Override
public void close() {
if (LOG.isDebugEnabled()) {
LOG.debug("Stopping rpc client");
}
Collection<T> connToClose;
synchronized (connections) {
if (!running) {
return;
}
running = false;
connToClose = connections.values();
connections.clear();
}
cleanupIdleConnectionTask.cancel(true);
for (T conn : connToClose) {
conn.shutdown();
}
closeInternal();
for (T conn : connToClose) {
conn.cleanupConnection();
}
}
@Override
public BlockingRpcChannel createBlockingRpcChannel(final ServerName sn, final User ticket,
int rpcTimeout) throws UnknownHostException {
return new BlockingRpcChannelImplementation(this, createAddr(sn), ticket, rpcTimeout);
}
@Override
public RpcChannel createRpcChannel(ServerName sn, User user, int rpcTimeout)
throws UnknownHostException {
return new RpcChannelImplementation(this, createAddr(sn), user, rpcTimeout);
}
private static class AbstractRpcChannel {
protected final InetSocketAddress addr;
protected final AbstractRpcClient<?> rpcClient;
protected final User ticket;
protected final int rpcTimeout;
protected AbstractRpcChannel(AbstractRpcClient<?> rpcClient, InetSocketAddress addr,
User ticket, int rpcTimeout) {
this.addr = addr;
this.rpcClient = rpcClient;
this.ticket = ticket;
this.rpcTimeout = rpcTimeout;
}
/**
* Configure an rpc controller
* @param controller to configure
* @return configured rpc controller
*/
protected HBaseRpcController configureRpcController(RpcController controller) {
HBaseRpcController hrc;
// TODO: Ideally we should not use an RpcController other than HBaseRpcController at client
// side. And now we may use ServerRpcController.
if (controller != null && controller instanceof HBaseRpcController) {
hrc = (HBaseRpcController) controller;
if (!hrc.hasCallTimeout()) {
hrc.setCallTimeout(rpcTimeout);
}
} else {
hrc = new HBaseRpcControllerImpl();
hrc.setCallTimeout(rpcTimeout);
}
return hrc;
}
}
/**
* Blocking rpc channel that goes via hbase rpc.
*/
@VisibleForTesting
public static class BlockingRpcChannelImplementation extends AbstractRpcChannel
implements BlockingRpcChannel {
protected BlockingRpcChannelImplementation(AbstractRpcClient<?> rpcClient,
InetSocketAddress addr, User ticket, int rpcTimeout) {
super(rpcClient, addr, ticket, rpcTimeout);
}
@Override
public Message callBlockingMethod(Descriptors.MethodDescriptor md, RpcController controller,
Message param, Message returnType) throws ServiceException {
return rpcClient.callBlockingMethod(md, configureRpcController(controller),
param, returnType, ticket, addr);
}
}
/**
* Async rpc channel that goes via hbase rpc.
*/
public static class RpcChannelImplementation extends AbstractRpcChannel implements
RpcChannel {
protected RpcChannelImplementation(AbstractRpcClient<?> rpcClient, InetSocketAddress addr,
User ticket, int rpcTimeout) throws UnknownHostException {
super(rpcClient, addr, ticket, rpcTimeout);
}
@Override
public void callMethod(Descriptors.MethodDescriptor md, RpcController controller,
Message param, Message returnType, RpcCallback<Message> done) {
// This method does not throw any exceptions, so the caller must provide a
// HBaseRpcController which is used to pass the exceptions.
this.rpcClient.callMethod(md,
configureRpcController(Preconditions.checkNotNull(controller,
"RpcController can not be null for async rpc call")),
param, returnType, ticket, addr, done);
}
}
}