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Server functionality for HBase
/**
* 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 java.io.IOException;
import java.io.InputStream;
import java.net.InetAddress;
import java.net.Socket;
import java.nio.ByteBuffer;
import java.nio.channels.ReadableByteChannel;
import java.nio.channels.SocketChannel;
import java.util.concurrent.ConcurrentLinkedDeque;
import java.util.concurrent.atomic.LongAdder;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;
import org.apache.hadoop.hbase.CellScanner;
import org.apache.hadoop.hbase.DoNotRetryIOException;
import org.apache.yetus.audience.InterfaceAudience;
import org.apache.hadoop.hbase.client.VersionInfoUtil;
import org.apache.hadoop.hbase.exceptions.RequestTooBigException;
import org.apache.hadoop.hbase.ipc.RpcServer.CallCleanup;
import org.apache.hadoop.hbase.nio.ByteBuff;
import org.apache.hbase.thirdparty.com.google.protobuf.BlockingService;
import org.apache.hbase.thirdparty.com.google.protobuf.CodedInputStream;
import org.apache.hbase.thirdparty.com.google.protobuf.Descriptors.MethodDescriptor;
import org.apache.hbase.thirdparty.com.google.protobuf.Message;
import org.apache.hadoop.hbase.shaded.protobuf.ProtobufUtil;
import org.apache.hadoop.hbase.shaded.protobuf.generated.RPCProtos.RequestHeader;
/** Reads calls from a connection and queues them for handling. */
@edu.umd.cs.findbugs.annotations.SuppressWarnings(value = "VO_VOLATILE_INCREMENT",
justification = "False positive according to http://sourceforge.net/p/findbugs/bugs/1032/")
@InterfaceAudience.Private
class SimpleServerRpcConnection extends ServerRpcConnection {
final SocketChannel channel;
private ByteBuff data;
private ByteBuffer dataLengthBuffer;
private ByteBuffer preambleBuffer;
private final LongAdder rpcCount = new LongAdder(); // number of outstanding rpcs
private long lastContact;
private final Socket socket;
final SimpleRpcServerResponder responder;
// If initial preamble with version and magic has been read or not.
private boolean connectionPreambleRead = false;
final ConcurrentLinkedDeque responseQueue = new ConcurrentLinkedDeque<>();
final Lock responseWriteLock = new ReentrantLock();
long lastSentTime = -1L;
public SimpleServerRpcConnection(SimpleRpcServer rpcServer, SocketChannel channel,
long lastContact) {
super(rpcServer);
this.channel = channel;
this.lastContact = lastContact;
this.data = null;
this.dataLengthBuffer = ByteBuffer.allocate(4);
this.socket = channel.socket();
this.addr = socket.getInetAddress();
if (addr == null) {
this.hostAddress = "*Unknown*";
} else {
this.hostAddress = addr.getHostAddress();
}
this.remotePort = socket.getPort();
if (rpcServer.socketSendBufferSize != 0) {
try {
socket.setSendBufferSize(rpcServer.socketSendBufferSize);
} catch (IOException e) {
SimpleRpcServer.LOG.warn(
"Connection: unable to set socket send buffer size to " + rpcServer.socketSendBufferSize);
}
}
this.responder = rpcServer.responder;
}
public void setLastContact(long lastContact) {
this.lastContact = lastContact;
}
public long getLastContact() {
return lastContact;
}
/* Return true if the connection has no outstanding rpc */
boolean isIdle() {
return rpcCount.sum() == 0;
}
/* Decrement the outstanding RPC count */
protected void decRpcCount() {
rpcCount.decrement();
}
/* Increment the outstanding RPC count */
protected void incRpcCount() {
rpcCount.increment();
}
private int readPreamble() throws IOException {
if (preambleBuffer == null) {
preambleBuffer = ByteBuffer.allocate(6);
}
int count = this.rpcServer.channelRead(channel, preambleBuffer);
if (count < 0 || preambleBuffer.remaining() > 0) {
return count;
}
preambleBuffer.flip();
if (!processPreamble(preambleBuffer)) {
return -1;
}
preambleBuffer = null; // do not need it anymore
connectionPreambleRead = true;
return count;
}
private int read4Bytes() throws IOException {
if (this.dataLengthBuffer.remaining() > 0) {
return this.rpcServer.channelRead(channel, this.dataLengthBuffer);
} else {
return 0;
}
}
/**
* Read off the wire. If there is not enough data to read, update the connection state with what
* we have and returns.
* @return Returns -1 if failure (and caller will close connection), else zero or more.
* @throws IOException
* @throws InterruptedException
*/
public int readAndProcess() throws IOException, InterruptedException {
// If we have not read the connection setup preamble, look to see if that is on the wire.
if (!connectionPreambleRead) {
int count = readPreamble();
if (!connectionPreambleRead) {
return count;
}
}
// Try and read in an int. it will be length of the data to read (or -1 if a ping). We catch the
// integer length into the 4-byte this.dataLengthBuffer.
int count = read4Bytes();
if (count < 0 || dataLengthBuffer.remaining() > 0) {
return count;
}
// We have read a length and we have read the preamble. It is either the connection header
// or it is a request.
if (data == null) {
dataLengthBuffer.flip();
int dataLength = dataLengthBuffer.getInt();
if (dataLength == RpcClient.PING_CALL_ID) {
if (!useWrap) { // covers the !useSasl too
dataLengthBuffer.clear();
return 0; // ping message
}
}
if (dataLength < 0) { // A data length of zero is legal.
throw new DoNotRetryIOException(
"Unexpected data length " + dataLength + "!! from " + getHostAddress());
}
if (dataLength > this.rpcServer.maxRequestSize) {
String msg = "RPC data length of " + dataLength + " received from " + getHostAddress() +
" is greater than max allowed " + this.rpcServer.maxRequestSize + ". Set \"" +
SimpleRpcServer.MAX_REQUEST_SIZE +
"\" on server to override this limit (not recommended)";
SimpleRpcServer.LOG.warn(msg);
if (connectionHeaderRead && connectionPreambleRead) {
incRpcCount();
// Construct InputStream for the non-blocking SocketChannel
// We need the InputStream because we want to read only the request header
// instead of the whole rpc.
ByteBuffer buf = ByteBuffer.allocate(1);
InputStream is = new InputStream() {
@Override
public int read() throws IOException {
SimpleServerRpcConnection.this.rpcServer.channelRead(channel, buf);
buf.flip();
int x = buf.get();
buf.flip();
return x;
}
};
CodedInputStream cis = CodedInputStream.newInstance(is);
int headerSize = cis.readRawVarint32();
Message.Builder builder = RequestHeader.newBuilder();
ProtobufUtil.mergeFrom(builder, cis, headerSize);
RequestHeader header = (RequestHeader) builder.build();
// Notify the client about the offending request
SimpleServerCall reqTooBig = new SimpleServerCall(header.getCallId(), this.service, null,
null, null, null, this, 0, this.addr, System.currentTimeMillis(), 0,
this.rpcServer.bbAllocator, this.rpcServer.cellBlockBuilder, null, responder);
this.rpcServer.metrics.exception(SimpleRpcServer.REQUEST_TOO_BIG_EXCEPTION);
// Make sure the client recognizes the underlying exception
// Otherwise, throw a DoNotRetryIOException.
if (VersionInfoUtil.hasMinimumVersion(connectionHeader.getVersionInfo(),
RequestTooBigException.MAJOR_VERSION, RequestTooBigException.MINOR_VERSION)) {
reqTooBig.setResponse(null, null, SimpleRpcServer.REQUEST_TOO_BIG_EXCEPTION, msg);
} else {
reqTooBig.setResponse(null, null, new DoNotRetryIOException(), msg);
}
// In most cases we will write out the response directly. If not, it is still OK to just
// close the connection without writing out the reqTooBig response. Do not try to write
// out directly here, and it will cause deserialization error if the connection is slow
// and we have a half writing response in the queue.
reqTooBig.sendResponseIfReady();
}
// Close the connection
return -1;
}
// Initialize this.data with a ByteBuff.
// This call will allocate a ByteBuff to read request into and assign to this.data
// Also when we use some buffer(s) from pool, it will create a CallCleanup instance also and
// assign to this.callCleanup
initByteBuffToReadInto(dataLength);
// Increment the rpc count. This counter will be decreased when we write
// the response. If we want the connection to be detected as idle properly, we
// need to keep the inc / dec correct.
incRpcCount();
}
count = channelDataRead(channel, data);
if (count >= 0 && data.remaining() == 0) { // count==0 if dataLength == 0
process();
}
return count;
}
// It creates the ByteBuff and CallCleanup and assign to Connection instance.
private void initByteBuffToReadInto(int length) {
this.data = rpcServer.bbAllocator.allocate(length);
this.callCleanup = data::release;
}
protected int channelDataRead(ReadableByteChannel channel, ByteBuff buf) throws IOException {
int count = buf.read(channel);
if (count > 0) {
this.rpcServer.metrics.receivedBytes(count);
}
return count;
}
/**
* Process the data buffer and clean the connection state for the next call.
*/
private void process() throws IOException, InterruptedException {
data.rewind();
try {
if (skipInitialSaslHandshake) {
skipInitialSaslHandshake = false;
return;
}
if (useSasl) {
saslReadAndProcess(data);
} else {
processOneRpc(data);
}
} finally {
dataLengthBuffer.clear(); // Clean for the next call
data = null; // For the GC
this.callCleanup = null;
}
}
@Override
public synchronized void close() {
disposeSasl();
data = null;
callCleanup = null;
if (!channel.isOpen()) return;
try {
socket.shutdownOutput();
} catch (Exception ignored) {
if (SimpleRpcServer.LOG.isTraceEnabled()) {
SimpleRpcServer.LOG.trace("Ignored exception", ignored);
}
}
if (channel.isOpen()) {
try {
channel.close();
} catch (Exception ignored) {
}
}
try {
socket.close();
} catch (Exception ignored) {
if (SimpleRpcServer.LOG.isTraceEnabled()) {
SimpleRpcServer.LOG.trace("Ignored exception", ignored);
}
}
}
@Override
public boolean isConnectionOpen() {
return channel.isOpen();
}
@Override
public SimpleServerCall createCall(int id, BlockingService service, MethodDescriptor md,
RequestHeader header, Message param, CellScanner cellScanner, long size,
InetAddress remoteAddress, int timeout, CallCleanup reqCleanup) {
return new SimpleServerCall(id, service, md, header, param, cellScanner, this, size,
remoteAddress, System.currentTimeMillis(), timeout, this.rpcServer.bbAllocator,
this.rpcServer.cellBlockBuilder, reqCleanup, this.responder);
}
@Override
protected void doRespond(RpcResponse resp) throws IOException {
responder.doRespond(this, resp);
}
}