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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.net.InetAddress;
import java.nio.ByteBuffer;
import java.util.ArrayList;
import java.util.List;
import java.util.Optional;
import org.apache.hadoop.hbase.CellScanner;
import org.apache.hadoop.hbase.DoNotRetryIOException;
import org.apache.yetus.audience.InterfaceAudience;
import org.apache.hadoop.hbase.exceptions.RegionMovedException;
import org.apache.hadoop.hbase.io.ByteBufferListOutputStream;
import org.apache.hadoop.hbase.io.ByteBufferPool;
import org.apache.hadoop.hbase.ipc.RpcServer.CallCleanup;
import org.apache.hadoop.hbase.security.User;
import org.apache.hbase.thirdparty.com.google.protobuf.BlockingService;
import org.apache.hbase.thirdparty.com.google.protobuf.CodedOutputStream;
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.HBaseProtos.VersionInfo;
import org.apache.hadoop.hbase.shaded.protobuf.generated.RPCProtos.CellBlockMeta;
import org.apache.hadoop.hbase.shaded.protobuf.generated.RPCProtos.ExceptionResponse;
import org.apache.hadoop.hbase.shaded.protobuf.generated.RPCProtos.RequestHeader;
import org.apache.hadoop.hbase.shaded.protobuf.generated.RPCProtos.ResponseHeader;
import org.apache.hadoop.hbase.util.ByteBufferUtils;
import org.apache.hadoop.hbase.util.Bytes;
import org.apache.hadoop.util.StringUtils;
/**
* Datastructure that holds all necessary to a method invocation and then afterward, carries
* the result.
*/
@InterfaceAudience.Private
abstract class ServerCall implements RpcCall, RpcResponse {
protected final int id; // the client's call id
protected final BlockingService service;
protected final MethodDescriptor md;
protected final RequestHeader header;
protected Message param; // the parameter passed
// Optional cell data passed outside of protobufs.
protected final CellScanner cellScanner;
protected final T connection; // connection to client
protected final long receiveTime; // the time received when response is null
// the time served when response is not null
protected final int timeout;
protected long startTime;
protected final long deadline;// the deadline to handle this call, if exceed we can drop it.
protected final ByteBufferPool reservoir;
protected final CellBlockBuilder cellBlockBuilder;
/**
* Chain of buffers to send as response.
*/
protected BufferChain response;
protected final long size; // size of current call
protected boolean isError;
protected ByteBufferListOutputStream cellBlockStream = null;
protected CallCleanup reqCleanup = null;
protected final User user;
protected final InetAddress remoteAddress;
protected RpcCallback rpcCallback;
private long responseCellSize = 0;
private long responseBlockSize = 0;
// cumulative size of serialized exceptions
private long exceptionSize = 0;
private final boolean retryImmediatelySupported;
@edu.umd.cs.findbugs.annotations.SuppressWarnings(value="NP_NULL_ON_SOME_PATH",
justification="Can't figure why this complaint is happening... see below")
ServerCall(int id, BlockingService service, MethodDescriptor md, RequestHeader header,
Message param, CellScanner cellScanner, T connection, long size,
InetAddress remoteAddress, long receiveTime, int timeout, ByteBufferPool reservoir,
CellBlockBuilder cellBlockBuilder, CallCleanup reqCleanup) {
this.id = id;
this.service = service;
this.md = md;
this.header = header;
this.param = param;
this.cellScanner = cellScanner;
this.connection = connection;
this.receiveTime = receiveTime;
this.response = null;
this.isError = false;
this.size = size;
if (connection != null) {
this.user = connection.user;
this.retryImmediatelySupported = connection.retryImmediatelySupported;
} else {
this.user = null;
this.retryImmediatelySupported = false;
}
this.remoteAddress = remoteAddress;
this.timeout = timeout;
this.deadline = this.timeout > 0 ? this.receiveTime + this.timeout : Long.MAX_VALUE;
this.reservoir = reservoir;
this.cellBlockBuilder = cellBlockBuilder;
this.reqCleanup = reqCleanup;
}
/**
* Call is done. Execution happened and we returned results to client. It is
* now safe to cleanup.
*/
@edu.umd.cs.findbugs.annotations.SuppressWarnings(value = "IS2_INCONSISTENT_SYNC",
justification = "Presume the lock on processing request held by caller is protection enough")
@Override
public void done() {
if (this.cellBlockStream != null) {
// This will return back the BBs which we got from pool.
this.cellBlockStream.releaseResources();
this.cellBlockStream = null;
}
// If the call was run successfuly, we might have already returned the BB
// back to pool. No worries..Then inputCellBlock will be null
cleanup();
}
@Override
public void cleanup() {
if (this.reqCleanup != null) {
this.reqCleanup.run();
this.reqCleanup = null;
}
}
@Override
public String toString() {
return toShortString() + " param: " +
(this.param != null? ProtobufUtil.getShortTextFormat(this.param): "") +
" connection: " + connection.toString();
}
@Override
public RequestHeader getHeader() {
return this.header;
}
@Override
public int getPriority() {
return this.header.getPriority();
}
/*
* Short string representation without param info because param itself could be huge depends on
* the payload of a command
*/
@Override
public String toShortString() {
String serviceName = this.connection.service != null ?
this.connection.service.getDescriptorForType().getName() : "null";
return "callId: " + this.id + " service: " + serviceName +
" methodName: " + ((this.md != null) ? this.md.getName() : "n/a") +
" size: " + StringUtils.TraditionalBinaryPrefix.long2String(this.size, "", 1) +
" connection: " + connection.toString() +
" deadline: " + deadline;
}
@Override
public synchronized void setResponse(Message m, final CellScanner cells,
Throwable t, String errorMsg) {
if (this.isError) return;
if (t != null) this.isError = true;
BufferChain bc = null;
try {
ResponseHeader.Builder headerBuilder = ResponseHeader.newBuilder();
// Call id.
headerBuilder.setCallId(this.id);
if (t != null) {
setExceptionResponse(t, errorMsg, headerBuilder);
}
// Pass reservoir to buildCellBlock. Keep reference to returne so can add it back to the
// reservoir when finished. This is hacky and the hack is not contained but benefits are
// high when we can avoid a big buffer allocation on each rpc.
List cellBlock = null;
int cellBlockSize = 0;
if (this.reservoir != null) {
this.cellBlockStream = this.cellBlockBuilder.buildCellBlockStream(this.connection.codec,
this.connection.compressionCodec, cells, this.reservoir);
if (this.cellBlockStream != null) {
cellBlock = this.cellBlockStream.getByteBuffers();
cellBlockSize = this.cellBlockStream.size();
}
} else {
ByteBuffer b = this.cellBlockBuilder.buildCellBlock(this.connection.codec,
this.connection.compressionCodec, cells);
if (b != null) {
cellBlockSize = b.remaining();
cellBlock = new ArrayList<>(1);
cellBlock.add(b);
}
}
if (cellBlockSize > 0) {
CellBlockMeta.Builder cellBlockBuilder = CellBlockMeta.newBuilder();
// Presumes the cellBlock bytebuffer has been flipped so limit has total size in it.
cellBlockBuilder.setLength(cellBlockSize);
headerBuilder.setCellBlockMeta(cellBlockBuilder.build());
}
Message header = headerBuilder.build();
ByteBuffer headerBuf =
createHeaderAndMessageBytes(m, header, cellBlockSize, cellBlock);
ByteBuffer[] responseBufs = null;
int cellBlockBufferSize = 0;
if (cellBlock != null) {
cellBlockBufferSize = cellBlock.size();
responseBufs = new ByteBuffer[1 + cellBlockBufferSize];
} else {
responseBufs = new ByteBuffer[1];
}
responseBufs[0] = headerBuf;
if (cellBlock != null) {
for (int i = 0; i < cellBlockBufferSize; i++) {
responseBufs[i + 1] = cellBlock.get(i);
}
}
bc = new BufferChain(responseBufs);
if (connection.useWrap) {
bc = wrapWithSasl(bc);
}
} catch (IOException e) {
RpcServer.LOG.warn("Exception while creating response " + e);
}
this.response = bc;
// Once a response message is created and set to this.response, this Call can be treated as
// done. The Responder thread will do the n/w write of this message back to client.
if (this.rpcCallback != null) {
try {
this.rpcCallback.run();
} catch (Exception e) {
// Don't allow any exception here to kill this handler thread.
RpcServer.LOG.warn("Exception while running the Rpc Callback.", e);
}
}
}
static void setExceptionResponse(Throwable t, String errorMsg,
ResponseHeader.Builder headerBuilder) {
ExceptionResponse.Builder exceptionBuilder = ExceptionResponse.newBuilder();
exceptionBuilder.setExceptionClassName(t.getClass().getName());
exceptionBuilder.setStackTrace(errorMsg);
exceptionBuilder.setDoNotRetry(t instanceof DoNotRetryIOException);
if (t instanceof RegionMovedException) {
// Special casing for this exception. This is only one carrying a payload.
// Do this instead of build a generic system for allowing exceptions carry
// any kind of payload.
RegionMovedException rme = (RegionMovedException)t;
exceptionBuilder.setHostname(rme.getHostname());
exceptionBuilder.setPort(rme.getPort());
}
// Set the exception as the result of the method invocation.
headerBuilder.setException(exceptionBuilder.build());
}
static ByteBuffer createHeaderAndMessageBytes(Message result, Message header,
int cellBlockSize, List cellBlock) throws IOException {
// Organize the response as a set of bytebuffers rather than collect it all together inside
// one big byte array; save on allocations.
// for writing the header, we check if there is available space in the buffers
// created for the cellblock itself. If there is space for the header, we reuse
// the last buffer in the cellblock. This applies to the cellblock created from the
// pool or even the onheap cellblock buffer in case there is no pool enabled.
// Possible reuse would avoid creating a temporary array for storing the header every time.
ByteBuffer possiblePBBuf =
(cellBlockSize > 0) ? cellBlock.get(cellBlock.size() - 1) : null;
int headerSerializedSize = 0, resultSerializedSize = 0, headerVintSize = 0,
resultVintSize = 0;
if (header != null) {
headerSerializedSize = header.getSerializedSize();
headerVintSize = CodedOutputStream.computeUInt32SizeNoTag(headerSerializedSize);
}
if (result != null) {
resultSerializedSize = result.getSerializedSize();
resultVintSize = CodedOutputStream.computeUInt32SizeNoTag(resultSerializedSize);
}
// calculate the total size
int totalSize = headerSerializedSize + headerVintSize
+ (resultSerializedSize + resultVintSize)
+ cellBlockSize;
int totalPBSize = headerSerializedSize + headerVintSize + resultSerializedSize
+ resultVintSize + Bytes.SIZEOF_INT;
// Only if the last buffer has enough space for header use it. Else allocate
// a new buffer. Assume they are all flipped
if (possiblePBBuf != null
&& possiblePBBuf.limit() + totalPBSize <= possiblePBBuf.capacity()) {
// duplicate the buffer. This is where the header is going to be written
ByteBuffer pbBuf = possiblePBBuf.duplicate();
// get the current limit
int limit = pbBuf.limit();
// Position such that we write the header to the end of the buffer
pbBuf.position(limit);
// limit to the header size
pbBuf.limit(totalPBSize + limit);
// mark the current position
pbBuf.mark();
writeToCOS(result, header, totalSize, pbBuf);
// reset the buffer back to old position
pbBuf.reset();
return pbBuf;
} else {
return createHeaderAndMessageBytes(result, header, totalSize, totalPBSize);
}
}
private static void writeToCOS(Message result, Message header, int totalSize, ByteBuffer pbBuf)
throws IOException {
ByteBufferUtils.putInt(pbBuf, totalSize);
// create COS that works on BB
CodedOutputStream cos = CodedOutputStream.newInstance(pbBuf);
if (header != null) {
cos.writeMessageNoTag(header);
}
if (result != null) {
cos.writeMessageNoTag(result);
}
cos.flush();
cos.checkNoSpaceLeft();
}
private static ByteBuffer createHeaderAndMessageBytes(Message result, Message header,
int totalSize, int totalPBSize) throws IOException {
ByteBuffer pbBuf = ByteBuffer.allocate(totalPBSize);
writeToCOS(result, header, totalSize, pbBuf);
pbBuf.flip();
return pbBuf;
}
protected BufferChain wrapWithSasl(BufferChain bc)
throws IOException {
if (!this.connection.useSasl) return bc;
// Looks like no way around this; saslserver wants a byte array. I have to make it one.
// THIS IS A BIG UGLY COPY.
byte [] responseBytes = bc.getBytes();
byte [] token;
// synchronization may be needed since there can be multiple Handler
// threads using saslServer or Crypto AES to wrap responses.
if (connection.useCryptoAesWrap) {
// wrap with Crypto AES
synchronized (connection.cryptoAES) {
token = connection.cryptoAES.wrap(responseBytes, 0, responseBytes.length);
}
} else {
synchronized (connection.saslServer) {
token = connection.saslServer.wrap(responseBytes, 0, responseBytes.length);
}
}
if (RpcServer.LOG.isTraceEnabled()) {
RpcServer.LOG.trace("Adding saslServer wrapped token of size " + token.length
+ " as call response.");
}
ByteBuffer[] responseBufs = new ByteBuffer[2];
responseBufs[0] = ByteBuffer.wrap(Bytes.toBytes(token.length));
responseBufs[1] = ByteBuffer.wrap(token);
return new BufferChain(responseBufs);
}
@Override
public long disconnectSince() {
if (!this.connection.isConnectionOpen()) {
return System.currentTimeMillis() - receiveTime;
} else {
return -1L;
}
}
@Override
public boolean isClientCellBlockSupported() {
return this.connection != null && this.connection.codec != null;
}
@Override
public long getResponseCellSize() {
return responseCellSize;
}
@Override
public void incrementResponseCellSize(long cellSize) {
responseCellSize += cellSize;
}
@Override
public long getResponseBlockSize() {
return responseBlockSize;
}
@Override
public void incrementResponseBlockSize(long blockSize) {
responseBlockSize += blockSize;
}
@Override
public long getResponseExceptionSize() {
return exceptionSize;
}
@Override
public void incrementResponseExceptionSize(long exSize) {
exceptionSize += exSize;
}
@Override
public long getSize() {
return this.size;
}
@Override
public long getDeadline() {
return deadline;
}
@Override
public Optional getRequestUser() {
return Optional.ofNullable(user);
}
@Override
public InetAddress getRemoteAddress() {
return remoteAddress;
}
@Override
public VersionInfo getClientVersionInfo() {
return connection.getVersionInfo();
}
@Override
public synchronized void setCallBack(RpcCallback callback) {
this.rpcCallback = callback;
}
@Override
public boolean isRetryImmediatelySupported() {
return retryImmediatelySupported;
}
@Override
public BlockingService getService() {
return service;
}
@Override
public MethodDescriptor getMethod() {
return md;
}
@Override
public Message getParam() {
return param;
}
@Override
public CellScanner getCellScanner() {
return cellScanner;
}
@Override
public long getReceiveTime() {
return receiveTime;
}
@Override
public long getStartTime() {
return startTime;
}
@Override
public void setStartTime(long t) {
this.startTime = t;
}
@Override
public int getTimeout() {
return timeout;
}
@Override
public int getRemotePort() {
return connection.getRemotePort();
}
@Override
public synchronized BufferChain getResponse() {
return response;
}
}