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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.hbase.ipc;
import static org.apache.hadoop.hbase.ipc.CallEvent.Type.CANCELLED;
import static org.apache.hadoop.hbase.ipc.CallEvent.Type.TIMEOUT;
import static org.apache.hadoop.hbase.ipc.IPCUtil.execute;
import static org.apache.hadoop.hbase.ipc.IPCUtil.setCancelled;
import static org.apache.hadoop.hbase.ipc.IPCUtil.toIOE;
import java.io.IOException;
import java.util.concurrent.Executors;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.ThreadLocalRandom;
import java.util.concurrent.TimeUnit;
import org.apache.hadoop.hbase.ipc.BufferCallBeforeInitHandler.BufferCallEvent;
import org.apache.hadoop.hbase.ipc.HBaseRpcController.CancellationCallback;
import org.apache.hadoop.hbase.security.NettyHBaseRpcConnectionHeaderHandler;
import org.apache.hadoop.hbase.security.NettyHBaseSaslRpcClientHandler;
import org.apache.hadoop.hbase.security.SaslChallengeDecoder;
import org.apache.hadoop.hbase.util.Threads;
import org.apache.hadoop.security.UserGroupInformation;
import org.apache.hbase.thirdparty.com.google.common.util.concurrent.ThreadFactoryBuilder;
import org.apache.yetus.audience.InterfaceAudience;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.apache.hbase.thirdparty.com.google.protobuf.RpcCallback;
import org.apache.hbase.thirdparty.io.netty.bootstrap.Bootstrap;
import org.apache.hbase.thirdparty.io.netty.buffer.ByteBuf;
import org.apache.hbase.thirdparty.io.netty.buffer.ByteBufOutputStream;
import org.apache.hbase.thirdparty.io.netty.buffer.Unpooled;
import org.apache.hbase.thirdparty.io.netty.channel.Channel;
import org.apache.hbase.thirdparty.io.netty.channel.ChannelFuture;
import org.apache.hbase.thirdparty.io.netty.channel.ChannelFutureListener;
import org.apache.hbase.thirdparty.io.netty.channel.ChannelHandler;
import org.apache.hbase.thirdparty.io.netty.channel.ChannelOption;
import org.apache.hbase.thirdparty.io.netty.channel.ChannelPipeline;
import org.apache.hbase.thirdparty.io.netty.channel.EventLoop;
import org.apache.hbase.thirdparty.io.netty.handler.codec.LengthFieldBasedFrameDecoder;
import org.apache.hbase.thirdparty.io.netty.handler.timeout.IdleStateHandler;
import org.apache.hbase.thirdparty.io.netty.handler.timeout.ReadTimeoutHandler;
import org.apache.hbase.thirdparty.io.netty.util.ReferenceCountUtil;
import org.apache.hbase.thirdparty.io.netty.util.concurrent.Future;
import org.apache.hbase.thirdparty.io.netty.util.concurrent.FutureListener;
import org.apache.hbase.thirdparty.io.netty.util.concurrent.Promise;
import org.apache.hadoop.hbase.shaded.protobuf.generated.RPCProtos.ConnectionHeader;
/**
* RPC connection implementation based on netty.
*
* Most operations are executed in handlers. Netty handler is always executed in the same
* thread(EventLoop) so no lock is needed.
*
* Implementation assumptions: All the private methods should be called in the
* {@link #eventLoop} thread, otherwise there will be races.
* @since 2.0.0
*/
@InterfaceAudience.Private
class NettyRpcConnection extends RpcConnection {
private static final Logger LOG = LoggerFactory.getLogger(NettyRpcConnection.class);
private static final ScheduledExecutorService RELOGIN_EXECUTOR = Executors
.newSingleThreadScheduledExecutor(new ThreadFactoryBuilder().setNameFormat("Relogin-pool-%d")
.setDaemon(true).setUncaughtExceptionHandler(Threads.LOGGING_EXCEPTION_HANDLER).build());
private final NettyRpcClient rpcClient;
// the event loop used to set up the connection, we will also execute other operations for this
// connection in this event loop, to avoid locking everywhere.
private final EventLoop eventLoop;
private ByteBuf connectionHeaderPreamble;
private ByteBuf connectionHeaderWithLength;
// make it volatile so in the isActive method below we do not need to switch to the event loop
// thread to access this field.
private volatile Channel channel;
NettyRpcConnection(NettyRpcClient rpcClient, ConnectionId remoteId) throws IOException {
super(rpcClient.conf, AbstractRpcClient.WHEEL_TIMER, remoteId, rpcClient.clusterId,
rpcClient.userProvider.isHBaseSecurityEnabled(), rpcClient.codec, rpcClient.compressor);
this.rpcClient = rpcClient;
this.eventLoop = rpcClient.group.next();
byte[] connectionHeaderPreamble = getConnectionHeaderPreamble();
this.connectionHeaderPreamble =
Unpooled.directBuffer(connectionHeaderPreamble.length).writeBytes(connectionHeaderPreamble);
ConnectionHeader header = getConnectionHeader();
this.connectionHeaderWithLength = Unpooled.directBuffer(4 + header.getSerializedSize());
this.connectionHeaderWithLength.writeInt(header.getSerializedSize());
header.writeTo(new ByteBufOutputStream(this.connectionHeaderWithLength));
}
@Override
protected void callTimeout(Call call) {
execute(eventLoop, () -> {
if (channel != null) {
channel.pipeline().fireUserEventTriggered(new CallEvent(TIMEOUT, call));
}
});
}
@Override
public boolean isActive() {
return channel != null;
}
private void shutdown0() {
assert eventLoop.inEventLoop();
if (channel != null) {
channel.close();
channel = null;
}
}
@Override
public void shutdown() {
execute(eventLoop, this::shutdown0);
}
@Override
public void cleanupConnection() {
execute(eventLoop, () -> {
if (connectionHeaderPreamble != null) {
ReferenceCountUtil.safeRelease(connectionHeaderPreamble);
connectionHeaderPreamble = null;
}
if (connectionHeaderWithLength != null) {
ReferenceCountUtil.safeRelease(connectionHeaderWithLength);
connectionHeaderWithLength = null;
}
});
}
private void established(Channel ch) throws IOException {
assert eventLoop.inEventLoop();
ChannelPipeline p = ch.pipeline();
String addBeforeHandler = p.context(BufferCallBeforeInitHandler.class).name();
p.addBefore(addBeforeHandler, null,
new IdleStateHandler(0, rpcClient.minIdleTimeBeforeClose, 0, TimeUnit.MILLISECONDS));
p.addBefore(addBeforeHandler, null, new LengthFieldBasedFrameDecoder(Integer.MAX_VALUE, 0, 4));
p.addBefore(addBeforeHandler, null,
new NettyRpcDuplexHandler(this, rpcClient.cellBlockBuilder, codec, compressor));
p.fireUserEventTriggered(BufferCallEvent.success());
}
private boolean reloginInProgress;
private void scheduleRelogin(Throwable error) {
assert eventLoop.inEventLoop();
if (error instanceof FallbackDisallowedException) {
return;
}
if (!provider.canRetry()) {
LOG.trace("SASL Provider does not support retries");
return;
}
if (reloginInProgress) {
return;
}
reloginInProgress = true;
RELOGIN_EXECUTOR.schedule(() -> {
try {
provider.relogin();
} catch (IOException e) {
LOG.warn("Relogin failed", e);
}
eventLoop.execute(() -> {
reloginInProgress = false;
});
}, ThreadLocalRandom.current().nextInt(reloginMaxBackoff), TimeUnit.MILLISECONDS);
}
private void failInit(Channel ch, IOException e) {
assert eventLoop.inEventLoop();
// fail all pending calls
ch.pipeline().fireUserEventTriggered(BufferCallEvent.fail(e));
shutdown0();
}
private void saslNegotiate(final Channel ch) {
assert eventLoop.inEventLoop();
UserGroupInformation ticket = provider.getRealUser(remoteId.getTicket());
if (ticket == null) {
failInit(ch, new FatalConnectionException("ticket/user is null"));
return;
}
Promise saslPromise = ch.eventLoop().newPromise();
final NettyHBaseSaslRpcClientHandler saslHandler;
try {
saslHandler = new NettyHBaseSaslRpcClientHandler(saslPromise, ticket, provider, token,
serverAddress, securityInfo, rpcClient.fallbackAllowed, this.rpcClient.conf);
} catch (IOException e) {
failInit(ch, e);
return;
}
ch.pipeline().addFirst(new SaslChallengeDecoder(), saslHandler);
saslPromise.addListener(new FutureListener() {
@Override
public void operationComplete(Future future) throws Exception {
if (future.isSuccess()) {
ChannelPipeline p = ch.pipeline();
p.remove(SaslChallengeDecoder.class);
p.remove(NettyHBaseSaslRpcClientHandler.class);
// check if negotiate with server for connection header is necessary
if (saslHandler.isNeedProcessConnectionHeader()) {
Promise connectionHeaderPromise = ch.eventLoop().newPromise();
// create the handler to handle the connection header
ChannelHandler chHandler = new NettyHBaseRpcConnectionHeaderHandler(
connectionHeaderPromise, conf, connectionHeaderWithLength);
// add ReadTimeoutHandler to deal with server doesn't response connection header
// because of the different configuration in client side and server side
p.addFirst(
new ReadTimeoutHandler(RpcClient.DEFAULT_SOCKET_TIMEOUT_READ, TimeUnit.MILLISECONDS));
p.addLast(chHandler);
connectionHeaderPromise.addListener(new FutureListener() {
@Override
public void operationComplete(Future future) throws Exception {
if (future.isSuccess()) {
ChannelPipeline p = ch.pipeline();
p.remove(ReadTimeoutHandler.class);
p.remove(NettyHBaseRpcConnectionHeaderHandler.class);
// don't send connection header, NettyHbaseRpcConnectionHeaderHandler
// sent it already
established(ch);
} else {
final Throwable error = future.cause();
scheduleRelogin(error);
failInit(ch, toIOE(error));
}
}
});
} else {
// send the connection header to server
ch.write(connectionHeaderWithLength.retainedDuplicate());
established(ch);
}
} else {
final Throwable error = future.cause();
scheduleRelogin(error);
failInit(ch, toIOE(error));
}
}
});
}
private void connect() {
assert eventLoop.inEventLoop();
LOG.trace("Connecting to {}", remoteId.address);
this.channel = new Bootstrap().group(eventLoop).channel(rpcClient.channelClass)
.option(ChannelOption.TCP_NODELAY, rpcClient.isTcpNoDelay())
.option(ChannelOption.SO_KEEPALIVE, rpcClient.tcpKeepAlive)
.option(ChannelOption.CONNECT_TIMEOUT_MILLIS, rpcClient.connectTO)
.handler(new BufferCallBeforeInitHandler()).localAddress(rpcClient.localAddr)
.remoteAddress(remoteId.address).connect().addListener(new ChannelFutureListener() {
@Override
public void operationComplete(ChannelFuture future) throws Exception {
Channel ch = future.channel();
if (!future.isSuccess()) {
failInit(ch, toIOE(future.cause()));
rpcClient.failedServers.addToFailedServers(remoteId.address, future.cause());
return;
}
ch.writeAndFlush(connectionHeaderPreamble.retainedDuplicate());
if (useSasl) {
saslNegotiate(ch);
} else {
// send the connection header to server
ch.write(connectionHeaderWithLength.retainedDuplicate());
established(ch);
}
}
}).channel();
}
private void sendRequest0(Call call, HBaseRpcController hrc) throws IOException {
assert eventLoop.inEventLoop();
if (reloginInProgress) {
throw new IOException("Can not send request because relogin is in progress.");
}
hrc.notifyOnCancel(new RpcCallback
