/**
* 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.protocolPB;
import java.io.Closeable;
import java.io.IOException;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.classification.InterfaceStability;
import org.apache.hadoop.hdfs.protocol.DatanodeID;
import org.apache.hadoop.hdfs.protocol.DatanodeInfo;
import org.apache.hadoop.hdfs.protocol.proto.HdfsProtos.NamenodeCommandProto;
import org.apache.hadoop.hdfs.protocol.proto.HdfsProtos.VersionRequestProto;
import org.apache.hadoop.hdfs.protocol.proto.NamenodeProtocolProtos.EndCheckpointRequestProto;
import org.apache.hadoop.hdfs.protocol.proto.NamenodeProtocolProtos.ErrorReportRequestProto;
import org.apache.hadoop.hdfs.protocol.proto.NamenodeProtocolProtos.GetBlockKeysRequestProto;
import org.apache.hadoop.hdfs.protocol.proto.NamenodeProtocolProtos.GetBlockKeysResponseProto;
import org.apache.hadoop.hdfs.protocol.proto.NamenodeProtocolProtos.GetBlocksRequestProto;
import org.apache.hadoop.hdfs.protocol.proto.NamenodeProtocolProtos.GetEditLogManifestRequestProto;
import org.apache.hadoop.hdfs.protocol.proto.NamenodeProtocolProtos.GetMostRecentCheckpointTxIdRequestProto;
import org.apache.hadoop.hdfs.protocol.proto.NamenodeProtocolProtos.GetTransactionIdRequestProto;
import org.apache.hadoop.hdfs.protocol.proto.NamenodeProtocolProtos.RegisterRequestProto;
import org.apache.hadoop.hdfs.protocol.proto.NamenodeProtocolProtos.RollEditLogRequestProto;
import org.apache.hadoop.hdfs.protocol.proto.NamenodeProtocolProtos.StartCheckpointRequestProto;
import org.apache.hadoop.hdfs.security.token.block.ExportedBlockKeys;
import org.apache.hadoop.hdfs.server.namenode.CheckpointSignature;
import org.apache.hadoop.hdfs.server.protocol.BlocksWithLocations;
import org.apache.hadoop.hdfs.server.protocol.NamenodeCommand;
import org.apache.hadoop.hdfs.server.protocol.NamenodeProtocol;
import org.apache.hadoop.hdfs.server.protocol.NamenodeRegistration;
import org.apache.hadoop.hdfs.server.protocol.NamespaceInfo;
import org.apache.hadoop.hdfs.server.protocol.RemoteEditLogManifest;
import org.apache.hadoop.ipc.ProtobufHelper;
import org.apache.hadoop.ipc.ProtocolMetaInterface;
import org.apache.hadoop.ipc.RPC;
import org.apache.hadoop.ipc.RpcClientUtil;
import com.google.protobuf.RpcController;
import com.google.protobuf.ServiceException;
/**
* This class is the client side translator to translate the requests made on
* {@link NamenodeProtocol} interfaces to the RPC server implementing
* {@link NamenodeProtocolPB}.
*/
@InterfaceAudience.Private
@InterfaceStability.Stable
public class NamenodeProtocolTranslatorPB implements NamenodeProtocol,
ProtocolMetaInterface, Closeable {
/** RpcController is not used and hence is set to null */
private final static RpcController NULL_CONTROLLER = null;
/*
* Protobuf requests with no parameters instantiated only once
*/
private static final GetBlockKeysRequestProto VOID_GET_BLOCKKEYS_REQUEST =
GetBlockKeysRequestProto.newBuilder().build();
private static final GetTransactionIdRequestProto VOID_GET_TRANSACTIONID_REQUEST =
GetTransactionIdRequestProto.newBuilder().build();
private static final RollEditLogRequestProto VOID_ROLL_EDITLOG_REQUEST =
RollEditLogRequestProto.newBuilder().build();
private static final VersionRequestProto VOID_VERSION_REQUEST =
VersionRequestProto.newBuilder().build();
final private NamenodeProtocolPB rpcProxy;
public NamenodeProtocolTranslatorPB(NamenodeProtocolPB rpcProxy) {
this.rpcProxy = rpcProxy;
}
@Override
public void close() {
RPC.stopProxy(rpcProxy);
}
@Override
public BlocksWithLocations getBlocks(DatanodeInfo datanode, long size)
throws IOException {
GetBlocksRequestProto req = GetBlocksRequestProto.newBuilder()
.setDatanode(PBHelper.convert((DatanodeID)datanode)).setSize(size)
.build();
try {
return PBHelper.convert(rpcProxy.getBlocks(NULL_CONTROLLER, req)
.getBlocks());
} catch (ServiceException e) {
throw ProtobufHelper.getRemoteException(e);
}
}
@Override
public ExportedBlockKeys getBlockKeys() throws IOException {
try {
GetBlockKeysResponseProto rsp = rpcProxy.getBlockKeys(NULL_CONTROLLER,
VOID_GET_BLOCKKEYS_REQUEST);
return rsp.hasKeys() ? PBHelper.convert(rsp.getKeys()) : null;
} catch (ServiceException e) {
throw ProtobufHelper.getRemoteException(e);
}
}
@Override
public long getTransactionID() throws IOException {
try {
return rpcProxy.getTransactionId(NULL_CONTROLLER,
VOID_GET_TRANSACTIONID_REQUEST).getTxId();
} catch (ServiceException e) {
throw ProtobufHelper.getRemoteException(e);
}
}
@Override
public long getMostRecentCheckpointTxId() throws IOException {
try {
return rpcProxy.getMostRecentCheckpointTxId(NULL_CONTROLLER,
GetMostRecentCheckpointTxIdRequestProto.getDefaultInstance()).getTxId();
} catch (ServiceException e) {
throw ProtobufHelper.getRemoteException(e);
}
}
@Override
public CheckpointSignature rollEditLog() throws IOException {
try {
return PBHelper.convert(rpcProxy.rollEditLog(NULL_CONTROLLER,
VOID_ROLL_EDITLOG_REQUEST).getSignature());
} catch (ServiceException e) {
throw ProtobufHelper.getRemoteException(e);
}
}
@Override
public NamespaceInfo versionRequest() throws IOException {
try {
return PBHelper.convert(rpcProxy.versionRequest(NULL_CONTROLLER,
VOID_VERSION_REQUEST).getInfo());
} catch (ServiceException e) {
throw ProtobufHelper.getRemoteException(e);
}
}
@Override
public void errorReport(NamenodeRegistration registration, int errorCode,
String msg) throws IOException {
ErrorReportRequestProto req = ErrorReportRequestProto.newBuilder()
.setErrorCode(errorCode).setMsg(msg)
.setRegistration(PBHelper.convert(registration)).build();
try {
rpcProxy.errorReport(NULL_CONTROLLER, req);
} catch (ServiceException e) {
throw ProtobufHelper.getRemoteException(e);
}
}
@Override
public NamenodeRegistration registerSubordinateNamenode(
NamenodeRegistration registration) throws IOException {
RegisterRequestProto req = RegisterRequestProto.newBuilder()
.setRegistration(PBHelper.convert(registration)).build();
try {
return PBHelper.convert(
rpcProxy.registerSubordinateNamenode(NULL_CONTROLLER, req)
.getRegistration());
} catch (ServiceException e) {
throw ProtobufHelper.getRemoteException(e);
}
}
@Override
public NamenodeCommand startCheckpoint(NamenodeRegistration registration)
throws IOException {
StartCheckpointRequestProto req = StartCheckpointRequestProto.newBuilder()
.setRegistration(PBHelper.convert(registration)).build();
NamenodeCommandProto cmd;
try {
cmd = rpcProxy.startCheckpoint(NULL_CONTROLLER, req).getCommand();
} catch (ServiceException e) {
throw ProtobufHelper.getRemoteException(e);
}
return PBHelper.convert(cmd);
}
@Override
public void endCheckpoint(NamenodeRegistration registration,
CheckpointSignature sig) throws IOException {
EndCheckpointRequestProto req = EndCheckpointRequestProto.newBuilder()
.setRegistration(PBHelper.convert(registration))
.setSignature(PBHelper.convert(sig)).build();
try {
rpcProxy.endCheckpoint(NULL_CONTROLLER, req);
} catch (ServiceException e) {
throw ProtobufHelper.getRemoteException(e);
}
}
@Override
public RemoteEditLogManifest getEditLogManifest(long sinceTxId)
throws IOException {
GetEditLogManifestRequestProto req = GetEditLogManifestRequestProto
.newBuilder().setSinceTxId(sinceTxId).build();
try {
return PBHelper.convert(rpcProxy.getEditLogManifest(NULL_CONTROLLER, req)
.getManifest());
} catch (ServiceException e) {
throw ProtobufHelper.getRemoteException(e);
}
}
@Override
public boolean isMethodSupported(String methodName) throws IOException {
return RpcClientUtil.isMethodSupported(rpcProxy, NamenodeProtocolPB.class,
RPC.RpcKind.RPC_PROTOCOL_BUFFER,
RPC.getProtocolVersion(NamenodeProtocolPB.class), methodName);
}
}