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HDFS-11106: libhdfs++: Some refactoring to better organize files (part 2). Contributed by James Clampffer.

This commit is contained in:
James 2017-03-06 12:30:19 -05:00 committed by James Clampffer
parent 0f3f8db113
commit 3e53da2d62
12 changed files with 1095 additions and 903 deletions
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2
hadoop-hdfs-project/hadoop-hdfs-native-client/src/main/native/libhdfspp/lib/rpc/CMakeLists.txt
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@ -16,7 +16,7 @@
# limitations under the License.
#
list(APPEND rpc_object_items rpc_connection.cc rpc_engine.cc sasl_protocol.cc sasl_engine.cc)
list(APPEND rpc_object_items rpc_connection_impl.cc rpc_engine.cc namenode_tracker.cc request.cc sasl_protocol.cc sasl_engine.cc)
if (CMAKE_USING_CYRUS_SASL)
list(APPEND rpc_object_items cyrus_sasl_engine.cc)
endif (CMAKE_USING_CYRUS_SASL)

134
hadoop-hdfs-project/hadoop-hdfs-native-client/src/main/native/libhdfspp/lib/rpc/namenode_tracker.cc Normal file
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@ -0,0 +1,134 @@
/**
* 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.
*/
#include "namenode_tracker.h"
#include "common/logging.h"
#include "common/libhdfs_events_impl.h"
#include "common/util.h"
namespace hdfs {
static std::string format_endpoints(const std::vector<::asio::ip::tcp::endpoint> &pts) {
std::stringstream ss;
for(unsigned int i=0; i<pts.size(); i++)
if(i == pts.size() - 1)
ss << pts[i];
else
ss << pts[i] << ", ";
return ss.str();
}
HANamenodeTracker::HANamenodeTracker(const std::vector<ResolvedNamenodeInfo> &servers,
::asio::io_service *ioservice,
std::shared_ptr<LibhdfsEvents> event_handlers)
: enabled_(false), resolved_(false),
ioservice_(ioservice), event_handlers_(event_handlers)
{
LOG_TRACE(kRPC, << "HANamenodeTracker got the following nodes");
for(unsigned int i=0;i<servers.size();i++)
LOG_TRACE(kRPC, << servers[i].str());
if(servers.size() >= 2) {
LOG_TRACE(kRPC, << "Creating HA namenode tracker");
if(servers.size() > 2) {
LOG_WARN(kRPC, << "Nameservice declares more than two nodes. Some won't be used.");
}
active_info_ = servers[0];
standby_info_ = servers[1];
LOG_INFO(kRPC, << "Active namenode url = " << active_info_.uri.str());
LOG_INFO(kRPC, << "Standby namenode url = " << standby_info_.uri.str());
enabled_ = true;
if(!active_info_.endpoints.empty() || !standby_info_.endpoints.empty()) {
resolved_ = true;
}
}
}
HANamenodeTracker::~HANamenodeTracker() {}
// Pass in endpoint from current connection, this will do a reverse lookup
// and return the info for the standby node. It will also swap its state internally.
ResolvedNamenodeInfo HANamenodeTracker::GetFailoverAndUpdate(::asio::ip::tcp::endpoint current_endpoint) {
LOG_TRACE(kRPC, << "Swapping from endpoint " << current_endpoint);
mutex_guard swap_lock(swap_lock_);
ResolvedNamenodeInfo failover_node;
// Connected to standby, switch standby to active
if(IsCurrentActive_locked(current_endpoint)) {
std::swap(active_info_, standby_info_);
if(event_handlers_)
event_handlers_->call(FS_NN_FAILOVER_EVENT, active_info_.nameservice.c_str(),
reinterpret_cast<int64_t>(active_info_.uri.str().c_str()));
failover_node = active_info_;
} else if(IsCurrentStandby_locked(current_endpoint)) {
// Connected to standby
if(event_handlers_)
event_handlers_->call(FS_NN_FAILOVER_EVENT, active_info_.nameservice.c_str(),
reinterpret_cast<int64_t>(active_info_.uri.str().c_str()));
failover_node = active_info_;
} else {
// Invalid state, throw for testing
std::string ep1 = format_endpoints(active_info_.endpoints);
std::string ep2 = format_endpoints(standby_info_.endpoints);
std::stringstream msg;
msg << "Looked for " << current_endpoint << " in\n";
msg << ep1 << " and\n";
msg << ep2 << std::endl;
LOG_ERROR(kRPC, << "Unable to find RPC connection in config " << msg.str() << ". Bailing out.");
throw std::runtime_error(msg.str());
}
if(failover_node.endpoints.empty()) {
LOG_WARN(kRPC, << "No endpoints for node " << failover_node.uri.str() << " attempting to resolve again");
if(!ResolveInPlace(ioservice_, failover_node)) {
LOG_ERROR(kRPC, << "Fallback endpoint resolution for node " << failover_node.uri.str()
<< "failed. Please make sure your configuration is up to date.");
}
}
return failover_node;
}
bool HANamenodeTracker::IsCurrentActive_locked(const ::asio::ip::tcp::endpoint &ep) const {
for(unsigned int i=0;i<active_info_.endpoints.size();i++) {
if(ep.address() == active_info_.endpoints[i].address()) {
if(ep.port() != active_info_.endpoints[i].port())
LOG_WARN(kRPC, << "Port mismatch: " << ep << " vs " << active_info_.endpoints[i] << " trying anyway..");
return true;
}
}
return false;
}
bool HANamenodeTracker::IsCurrentStandby_locked(const ::asio::ip::tcp::endpoint &ep) const {
for(unsigned int i=0;i<standby_info_.endpoints.size();i++) {
if(ep.address() == standby_info_.endpoints[i].address()) {
if(ep.port() != standby_info_.endpoints[i].port())
LOG_WARN(kRPC, << "Port mismatch: " << ep << " vs " << standby_info_.endpoints[i] << " trying anyway..");
return true;
}
}
return false;
}
} // end namespace hdfs

81
hadoop-hdfs-project/hadoop-hdfs-native-client/src/main/native/libhdfspp/lib/rpc/namenode_tracker.h Normal file
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@ -0,0 +1,81 @@
/**
* 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.
*/
#ifndef LIB_RPC_NAMENODE_TRACKER_H
#define LIB_RPC_NAMENODE_TRACKER_H
#include "common/libhdfs_events_impl.h"
#include "common/namenode_info.h"
#include <asio/ip/tcp.hpp>
#include <memory>
#include <mutex>
#include <vector>
namespace hdfs {
/*
* Tracker gives the RpcEngine a quick way to use an endpoint that just
* failed in order to lookup a set of endpoints for a failover node.
*
* Note: For now this only deals with 2 NameNodes, but that's the default
* anyway.
*/
class HANamenodeTracker {
public:
HANamenodeTracker(const std::vector<ResolvedNamenodeInfo> &servers,
::asio::io_service *ioservice,
std::shared_ptr<LibhdfsEvents> event_handlers_);
virtual ~HANamenodeTracker();
bool is_enabled() const { return enabled_; }
bool is_resolved() const { return resolved_; }
// Get node opposite of the current one if possible (swaps active/standby)
// Note: This will always mutate internal state. Use IsCurrentActive/Standby to
// get info without changing state
ResolvedNamenodeInfo GetFailoverAndUpdate(::asio::ip::tcp::endpoint current_endpoint);
bool IsCurrentActive_locked(const ::asio::ip::tcp::endpoint &ep) const;
bool IsCurrentStandby_locked(const ::asio::ip::tcp::endpoint &ep) const;
private:
// If HA should be enabled, according to our options and runtime info like # nodes provided
bool enabled_;
// If we were able to resolve at least 1 HA namenode
bool resolved_;
// Keep service in case a second round of DNS lookup is required
::asio::io_service *ioservice_;
// Event handlers, for now this is the simplest place to catch all failover events
// and push info out to client application. Possibly move into RPCEngine.
std::shared_ptr<LibhdfsEvents> event_handlers_;
// Only support 1 active and 1 standby for now.
ResolvedNamenodeInfo active_info_;
ResolvedNamenodeInfo standby_info_;
// Aquire when switching from active-standby
std::mutex swap_lock_;
};
} // end namespace hdfs
#endif // end include guard

190
hadoop-hdfs-project/hadoop-hdfs-native-client/src/main/native/libhdfspp/lib/rpc/request.cc Normal file
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@ -0,0 +1,190 @@
/**
* 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.
*/
#include "request.h"
#include "rpc_engine.h"
#include "sasl_protocol.h"
#include "RpcHeader.pb.h"
#include "ProtobufRpcEngine.pb.h"
#include "IpcConnectionContext.pb.h"
#include <sstream>
namespace hdfs {
namespace pb = ::google::protobuf;
namespace pbio = ::google::protobuf::io;
using namespace ::hadoop::common;
using namespace ::std::placeholders;
static const int kNoRetry = -1;
// Protobuf helper functions.
static void AddHeadersToPacket(std::string *res,
std::initializer_list<const pb::MessageLite *> headers,
const std::string *payload) {
int len = 0;
std::for_each(
headers.begin(), headers.end(),
[&len](const pb::MessageLite *v) { len += DelimitedPBMessageSize(v); });
if (payload) {
len += payload->size();
}
int net_len = htonl(len);
res->reserve(res->size() + sizeof(net_len) + len);
pbio::StringOutputStream ss(res);
pbio::CodedOutputStream os(&ss);
os.WriteRaw(reinterpret_cast<const char *>(&net_len), sizeof(net_len));
uint8_t *buf = os.GetDirectBufferForNBytesAndAdvance(len);
assert(buf);
std::for_each(
headers.begin(), headers.end(), [&buf](const pb::MessageLite *v) {
buf = pbio::CodedOutputStream::WriteVarint32ToArray(v->ByteSize(), buf);
buf = v->SerializeWithCachedSizesToArray(buf);
});
if (payload) {
buf = os.WriteStringToArray(*payload, buf);
}
}
static void ConstructPayload(std::string *res, const pb::MessageLite *header) {
int len = DelimitedPBMessageSize(header);
res->reserve(len);
pbio::StringOutputStream ss(res);
pbio::CodedOutputStream os(&ss);
uint8_t *buf = os.GetDirectBufferForNBytesAndAdvance(len);
assert(buf);
buf = pbio::CodedOutputStream::WriteVarint32ToArray(header->ByteSize(), buf);
buf = header->SerializeWithCachedSizesToArray(buf);
}
static void ConstructPayload(std::string *res, const std::string *request) {
int len =
pbio::CodedOutputStream::VarintSize32(request->size()) + request->size();
res->reserve(len);
pbio::StringOutputStream ss(res);
pbio::CodedOutputStream os(&ss);
uint8_t *buf = os.GetDirectBufferForNBytesAndAdvance(len);
assert(buf);
buf = pbio::CodedOutputStream::WriteVarint32ToArray(request->size(), buf);
buf = os.WriteStringToArray(*request, buf);
}
static void SetRequestHeader(LockFreeRpcEngine *engine, int call_id,
const std::string &method_name, int retry_count,
RpcRequestHeaderProto *rpc_header,
RequestHeaderProto *req_header) {
rpc_header->set_rpckind(RPC_PROTOCOL_BUFFER);
rpc_header->set_rpcop(RpcRequestHeaderProto::RPC_FINAL_PACKET);
rpc_header->set_callid(call_id);
if (retry_count != kNoRetry)
rpc_header->set_retrycount(retry_count);
rpc_header->set_clientid(engine->client_id());
req_header->set_methodname(method_name);
req_header->set_declaringclassprotocolname(engine->protocol_name());
req_header->set_clientprotocolversion(engine->protocol_version());
}
// Request implementation
Request::Request(LockFreeRpcEngine *engine, const std::string &method_name, int call_id,
const std::string &request, Handler &&handler)
: engine_(engine),
method_name_(method_name),
call_id_(call_id),
timer_(engine->io_service()),
handler_(std::move(handler)),
retry_count_(engine->retry_policy() ? 0 : kNoRetry),
failover_count_(0) {
ConstructPayload(&payload_, &request);
}
Request::Request(LockFreeRpcEngine *engine, const std::string &method_name, int call_id,
const pb::MessageLite *request, Handler &&handler)
: engine_(engine),
method_name_(method_name),
call_id_(call_id),
timer_(engine->io_service()),
handler_(std::move(handler)),
retry_count_(engine->retry_policy() ? 0 : kNoRetry),
failover_count_(0) {
ConstructPayload(&payload_, request);
}
Request::Request(LockFreeRpcEngine *engine, Handler &&handler)
: engine_(engine),
call_id_(-1),
timer_(engine->io_service()),
handler_(std::move(handler)),
retry_count_(engine->retry_policy() ? 0 : kNoRetry),
failover_count_(0) {
}
void Request::GetPacket(std::string *res) const {
LOG_TRACE(kRPC, << "Request::GetPacket called");
if (payload_.empty())
return;
RpcRequestHeaderProto rpc_header;
RequestHeaderProto req_header;
SetRequestHeader(engine_, call_id_, method_name_, retry_count_, &rpc_header,
&req_header);
// SASL messages don't have a request header
if (method_name_ != SASL_METHOD_NAME)
AddHeadersToPacket(res, {&rpc_header, &req_header}, &payload_);
else
AddHeadersToPacket(res, {&rpc_header}, &payload_);
}
void Request::OnResponseArrived(pbio::CodedInputStream *is,
const Status &status) {
LOG_TRACE(kRPC, << "Request::OnResponseArrived called");
handler_(is, status);
}
std::string Request::GetDebugString() const {
// Basic description of this object, aimed at debugging
std::stringstream ss;
ss << "\nRequest Object:\n";
ss << "\tMethod name = \"" << method_name_ << "\"\n";
ss << "\tCall id = " << call_id_ << "\n";
ss << "\tRetry Count = " << retry_count_ << "\n";
ss << "\tFailover count = " << failover_count_ << "\n";
return ss.str();
}
int Request::IncrementFailoverCount() {
// reset retry count when failing over
retry_count_ = 0;
return failover_count_++;
}
} // end namespace hdfs

87
hadoop-hdfs-project/hadoop-hdfs-native-client/src/main/native/libhdfspp/lib/rpc/request.h Normal file
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@ -0,0 +1,87 @@
/**
* 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.
*/
#ifndef LIB_RPC_RPC_REQUEST_H
#define LIB_RPC_RPC_REQUEST_H
#include "hdfspp/status.h"
#include "common/util.h"
#include "common/new_delete.h"
#include <string>
#include <google/protobuf/message_lite.h>
#include <google/protobuf/io/coded_stream.h>
#include <google/protobuf/io/zero_copy_stream_impl_lite.h>
#include <asio/deadline_timer.hpp>
namespace hdfs {
class LockFreeRpcEngine;
class SaslProtocol;
/*
* Internal bookkeeping for an outstanding request from the consumer.
*
* Threading model: not thread-safe; should only be accessed from a single
* thread at a time
*/
class Request {
public:
MEMCHECKED_CLASS(Request)
typedef std::function<void(::google::protobuf::io::CodedInputStream *is,
const Status &status)> Handler;
Request(LockFreeRpcEngine *engine, const std::string &method_name, int call_id,
const std::string &request, Handler &&callback);
Request(LockFreeRpcEngine *engine, const std::string &method_name, int call_id,
const ::google::protobuf::MessageLite *request, Handler &&callback);
// Null request (with no actual message) used to track the state of an
// initial Connect call
Request(LockFreeRpcEngine *engine, Handler &&handler);
int call_id() const { return call_id_; }
std::string method_name() const { return method_name_; }
::asio::deadline_timer &timer() { return timer_; }
int IncrementRetryCount() { return retry_count_++; }
int IncrementFailoverCount();
void GetPacket(std::string *res) const;
void OnResponseArrived(::google::protobuf::io::CodedInputStream *is,
const Status &status);
int get_failover_count() {return failover_count_;}
std::string GetDebugString() const;
private:
LockFreeRpcEngine *const engine_;
const std::string method_name_;
const int call_id_;
::asio::deadline_timer timer_;
std::string payload_;
const Handler handler_;
int retry_count_;
int failover_count_;
};
} // end namespace hdfs
#endif // end include guard

548
hadoop-hdfs-project/hadoop-hdfs-native-client/src/main/native/libhdfspp/lib/rpc/rpc_connection.h
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@ -15,430 +15,166 @@
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef LIB_RPC_RPC_CONNECTION_H_
#define LIB_RPC_RPC_CONNECTION_H_
#ifndef LIB_RPC_RPC_CONNECTION_H
#define LIB_RPC_RPC_CONNECTION_H
#include "rpc_engine.h"
/*
* Encapsulates a persistent connection to the NameNode, and the sending of
* RPC requests and evaluating their responses.
*
* Can have multiple RPC requests in-flight simultaneously, but they are
* evaluated in-order on the server side in a blocking manner.
*
* Threading model: public interface is thread-safe
* All handlers passed in to method calls will be called from an asio thread,
* and will not be holding any internal RpcConnection locks.
*/
#include "request.h"
#include "common/auth_info.h"
#include "common/logging.h"
#include "common/util.h"
#include "common/libhdfs_events_impl.h"
#include "sasl_protocol.h"
#include "common/new_delete.h"
#include "hdfspp/status.h"
#include <asio/connect.hpp>
#include <asio/read.hpp>
#include <asio/write.hpp>
#include <system_error>
#include <functional>
#include <memory>
#include <vector>
#include <deque>
#include <unordered_map>
namespace hdfs {
template <class Socket>
class RpcConnectionImpl : public RpcConnection {
public:
MEMCHECKED_CLASS(RpcConnectionImpl);
typedef const std::function<void(const Status &)> RpcCallback;
RpcConnectionImpl(RpcEngine *engine);
virtual ~RpcConnectionImpl() override;
class LockFreeRpcEngine;
class SaslProtocol;
class RpcConnection : public std::enable_shared_from_this<RpcConnection> {
public:
MEMCHECKED_CLASS(RpcConnection)
RpcConnection(LockFreeRpcEngine *engine);
virtual ~RpcConnection();
// Note that a single server can have multiple endpoints - especially both
// an ipv4 and ipv6 endpoint
virtual void Connect(const std::vector<::asio::ip::tcp::endpoint> &server,
const AuthInfo & auth_info,
RpcCallback &handler);
virtual void ConnectAndFlush(
const std::vector<::asio::ip::tcp::endpoint> &server) override;
virtual void SendHandshake(RpcCallback &handler) override;
virtual void SendContext(RpcCallback &handler) override;
virtual void Disconnect() override;
RpcCallback &handler) = 0;
virtual void ConnectAndFlush(const std::vector<::asio::ip::tcp::endpoint> &server) = 0;
virtual void Disconnect() = 0;
void StartReading();
void AsyncRpc(const std::string &method_name,
const ::google::protobuf::MessageLite *req,
std::shared_ptr<::google::protobuf::MessageLite> resp,
const RpcCallback &handler);
void AsyncRpc(const std::vector<std::shared_ptr<Request> > & requests);
// Enqueue requests before the connection is connected. Will be flushed
// on connect
void PreEnqueueRequests(std::vector<std::shared_ptr<Request>> requests);
// Put requests at the front of the current request queue
void PrependRequests_locked(std::vector<std::shared_ptr<Request>> requests);
void SetEventHandlers(std::shared_ptr<LibhdfsEvents> event_handlers);
void SetClusterName(std::string cluster_name);
LockFreeRpcEngine *engine() { return engine_; }
::asio::io_service &io_service();
protected:
struct Response {
enum ResponseState {
kReadLength,
kReadContent,
kParseResponse,
} state_;
unsigned length_;
std::vector<char> data_;
std::unique_ptr<::google::protobuf::io::ArrayInputStream> ar;
std::unique_ptr<::google::protobuf::io::CodedInputStream> in;
Response() : state_(kReadLength), length_(0) {}
};
// Initial handshaking protocol: connect->handshake-->(auth)?-->context->connected
virtual void SendHandshake(RpcCallback &handler) = 0;
void HandshakeComplete(const Status &s);
void AuthComplete(const Status &s, const AuthInfo & new_auth_info);
void AuthComplete_locked(const Status &s, const AuthInfo & new_auth_info);
virtual void SendContext(RpcCallback &handler) = 0;
void ContextComplete(const Status &s);
virtual void OnSendCompleted(const ::asio::error_code &ec,
size_t transferred) override;
size_t transferred) = 0;
virtual void OnRecvCompleted(const ::asio::error_code &ec,
size_t transferred) override;
virtual void FlushPendingRequests() override;
size_t transferred) = 0;
virtual void FlushPendingRequests()=0; // Synchronously write the next request
void AsyncRpc_locked(
const std::string &method_name,
const ::google::protobuf::MessageLite *req,
std::shared_ptr<::google::protobuf::MessageLite> resp,
const RpcCallback &handler);
void SendRpcRequests(const std::vector<std::shared_ptr<Request> > & requests);
void AsyncFlushPendingRequests(); // Queue requests to be flushed at a later time
Socket &TEST_get_mutable_socket() { return socket_; }
void TEST_set_connected(bool connected) { connected_ = connected ? kConnected : kNotYetConnected; }
std::shared_ptr<std::string> PrepareHandshakePacket();
std::shared_ptr<std::string> PrepareContextPacket();
static std::string SerializeRpcRequest(const std::string &method_name,
const ::google::protobuf::MessageLite *req);
private:
const Options options_;
::asio::ip::tcp::endpoint current_endpoint_;
std::vector<::asio::ip::tcp::endpoint> additional_endpoints_;
Socket socket_;
::asio::deadline_timer connect_timer_;
Status HandleRpcResponse(std::shared_ptr<Response> response);
void HandleRpcTimeout(std::shared_ptr<Request> req,
const ::asio::error_code &ec);
void CommsError(const Status &status);
void ConnectComplete(const ::asio::error_code &ec, const ::asio::ip::tcp::endpoint &remote);
void ClearAndDisconnect(const ::asio::error_code &ec);
std::shared_ptr<Request> RemoveFromRunningQueue(int call_id);
LockFreeRpcEngine *const engine_;
std::shared_ptr<Response> current_response_state_;
AuthInfo auth_info_;
// Connection can have deferred connection, especially when we're pausing
// during retry
enum ConnectedState {
kNotYetConnected,
kConnecting,
kHandshaking,
kAuthenticating,
kConnected,
kDisconnected
};
static std::string ToString(ConnectedState connected);
ConnectedState connected_;
// State machine for performing a SASL handshake
std::shared_ptr<SaslProtocol> sasl_protocol_;
// The request being sent over the wire; will also be in requests_on_fly_
std::shared_ptr<Request> request_over_the_wire_;
// Requests to be sent over the wire
std::deque<std::shared_ptr<Request>> pending_requests_;
// Requests to be sent over the wire during authentication; not retried if
// there is a connection error
std::deque<std::shared_ptr<Request>> auth_requests_;
// Requests that are waiting for responses
typedef std::unordered_map<int, std::shared_ptr<Request>> RequestOnFlyMap;
RequestOnFlyMap requests_on_fly_;
std::shared_ptr<LibhdfsEvents> event_handlers_;
std::string cluster_name_;
// Lock for mutable parts of this class that need to be thread safe
std::mutex connection_state_lock_;
friend class SaslProtocol;
};
template <class Socket>
RpcConnectionImpl<Socket>::RpcConnectionImpl(RpcEngine *engine)
: RpcConnection(engine),
options_(engine->options()),
socket_(engine->io_service()),
connect_timer_(engine->io_service())
{
LOG_TRACE(kRPC, << "RpcConnectionImpl::RpcConnectionImpl called &" << (void*)this);
}
template <class Socket>
RpcConnectionImpl<Socket>::~RpcConnectionImpl() {
LOG_DEBUG(kRPC, << "RpcConnectionImpl::~RpcConnectionImpl called &" << (void*)this);
if (pending_requests_.size() > 0)
LOG_WARN(kRPC, << "RpcConnectionImpl::~RpcConnectionImpl called with items in the pending queue");
if (requests_on_fly_.size() > 0)
LOG_WARN(kRPC, << "RpcConnectionImpl::~RpcConnectionImpl called with items in the requests_on_fly queue");
}
template <class Socket>
void RpcConnectionImpl<Socket>::Connect(
const std::vector<::asio::ip::tcp::endpoint> &server,
const AuthInfo & auth_info,
RpcCallback &handler) {
LOG_TRACE(kRPC, << "RpcConnectionImpl::Connect called");
this->auth_info_ = auth_info;
auto connectionSuccessfulReq = std::make_shared<Request>(
engine_, [handler](::google::protobuf::io::CodedInputStream *is,
const Status &status) {
(void)is;
handler(status);
});
pending_requests_.push_back(connectionSuccessfulReq);
this->ConnectAndFlush(server); // need "this" so compiler can infer type of CAF
}
template <class Socket>
void RpcConnectionImpl<Socket>::ConnectAndFlush(
const std::vector<::asio::ip::tcp::endpoint> &server) {
LOG_INFO(kRPC, << "ConnectAndFlush called");
std::lock_guard<std::mutex> state_lock(connection_state_lock_);
if (server.empty()) {
Status s = Status::InvalidArgument("No endpoints provided");
CommsError(s);
return;
}
if (connected_ == kConnected) {
FlushPendingRequests();
return;
}
if (connected_ != kNotYetConnected) {
LOG_WARN(kRPC, << "RpcConnectionImpl::ConnectAndFlush called while connected=" << ToString(connected_));
return;
}
connected_ = kConnecting;
// Take the first endpoint, but remember the alternatives for later
additional_endpoints_ = server;
::asio::ip::tcp::endpoint first_endpoint = additional_endpoints_.front();
additional_endpoints_.erase(additional_endpoints_.begin());
current_endpoint_ = first_endpoint;
auto shared_this = shared_from_this();
socket_.async_connect(first_endpoint, [shared_this, this, first_endpoint](const ::asio::error_code &ec) {
ConnectComplete(ec, first_endpoint);
});
// Prompt the timer to timeout
auto weak_this = std::weak_ptr<RpcConnection>(shared_this);
connect_timer_.expires_from_now(
std::chrono::milliseconds(options_.rpc_connect_timeout));
connect_timer_.async_wait([shared_this, this, first_endpoint](const ::asio::error_code &ec) {
if (ec)
ConnectComplete(ec, first_endpoint);
else
ConnectComplete(make_error_code(asio::error::host_unreachable), first_endpoint);
});
}
template <class Socket>
void RpcConnectionImpl<Socket>::ConnectComplete(const ::asio::error_code &ec, const ::asio::ip::tcp::endpoint & remote) {
auto shared_this = RpcConnectionImpl<Socket>::shared_from_this();
std::lock_guard<std::mutex> state_lock(connection_state_lock_);
connect_timer_.cancel();
LOG_TRACE(kRPC, << "RpcConnectionImpl::ConnectComplete called");
// Could be an old async connect returning a result after we've moved on
if (remote != current_endpoint_) {
LOG_DEBUG(kRPC, << "Got ConnectComplete for " << remote << " but current_endpoint_ is " << current_endpoint_);
return;
}
if (connected_ != kConnecting) {
LOG_DEBUG(kRPC, << "Got ConnectComplete but current state is " << connected_);;
return;
}
Status status = ToStatus(ec);
if(event_handlers_) {
event_response event_resp = event_handlers_->call(FS_NN_CONNECT_EVENT, cluster_name_.c_str(), 0);
#ifndef LIBHDFSPP_SIMULATE_ERROR_DISABLED
if (event_resp.response() == event_response::kTest_Error) {
status = event_resp.status();
}
#endif
}
if (status.ok()) {
StartReading();
SendHandshake([shared_this, this](const Status & s) {
HandshakeComplete(s);
});
} else {
LOG_DEBUG(kRPC, << "Rpc connection failed; err=" << status.ToString());;
std::string err = SafeDisconnect(get_asio_socket_ptr(&socket_));
if(!err.empty()) {
LOG_INFO(kRPC, << "Rpc connection failed to connect to endpoint, error closing connection: " << err);
}
if (!additional_endpoints_.empty()) {
// If we have additional endpoints, keep trying until we either run out or
// hit one
::asio::ip::tcp::endpoint next_endpoint = additional_endpoints_.front();
additional_endpoints_.erase(additional_endpoints_.begin());
current_endpoint_ = next_endpoint;
socket_.async_connect(next_endpoint, [shared_this, this, next_endpoint](const ::asio::error_code &ec) {
ConnectComplete(ec, next_endpoint);
});
connect_timer_.expires_from_now(
std::chrono::milliseconds(options_.rpc_connect_timeout));
connect_timer_.async_wait([shared_this, this, next_endpoint](const ::asio::error_code &ec) {
if (ec)
ConnectComplete(ec, next_endpoint);
else
ConnectComplete(make_error_code(asio::error::host_unreachable), next_endpoint);
});
} else {
CommsError(status);
}
}
}
template <class Socket>
void RpcConnectionImpl<Socket>::SendHandshake(RpcCallback &handler) {
assert(lock_held(connection_state_lock_)); // Must be holding lock before calling
LOG_TRACE(kRPC, << "RpcConnectionImpl::SendHandshake called");
connected_ = kHandshaking;
auto shared_this = shared_from_this();
auto handshake_packet = PrepareHandshakePacket();
::asio::async_write(socket_, asio::buffer(*handshake_packet),
[handshake_packet, handler, shared_this, this](
const ::asio::error_code &ec, size_t) {
Status status = ToStatus(ec);
handler(status);
});
}
template <class Socket>
void RpcConnectionImpl<Socket>::SendContext(RpcCallback &handler) {
assert(lock_held(connection_state_lock_)); // Must be holding lock before calling
LOG_TRACE(kRPC, << "RpcConnectionImpl::SendContext called");
auto shared_this = shared_from_this();
auto context_packet = PrepareContextPacket();
::asio::async_write(socket_, asio::buffer(*context_packet),
[context_packet, handler, shared_this, this](
const ::asio::error_code &ec, size_t) {
Status status = ToStatus(ec);
handler(status);
});
}
template <class Socket>
void RpcConnectionImpl<Socket>::OnSendCompleted(const ::asio::error_code &ec,
size_t) {
using std::placeholders::_1;
using std::placeholders::_2;
std::lock_guard<std::mutex> state_lock(connection_state_lock_);
LOG_TRACE(kRPC, << "RpcConnectionImpl::OnSendCompleted called");
request_over_the_wire_.reset();
if (ec) {
LOG_WARN(kRPC, << "Network error during RPC write: " << ec.message());
CommsError(ToStatus(ec));
return;
}
FlushPendingRequests();
}
template <class Socket>
void RpcConnectionImpl<Socket>::FlushPendingRequests() {
using namespace ::std::placeholders;
// Lock should be held
assert(lock_held(connection_state_lock_));
LOG_TRACE(kRPC, << "RpcConnectionImpl::FlushPendingRequests called");
// Don't send if we don't need to
if (request_over_the_wire_) {
return;
}
std::shared_ptr<Request> req;
switch (connected_) {
case kNotYetConnected:
return;
case kConnecting:
return;
case kHandshaking:
return;
case kAuthenticating:
if (auth_requests_.empty()) {
return;
}
req = auth_requests_.front();
auth_requests_.erase(auth_requests_.begin());
break;
case kConnected:
if (pending_requests_.empty()) {
return;
}
req = pending_requests_.front();
pending_requests_.erase(pending_requests_.begin());
break;
case kDisconnected:
LOG_DEBUG(kRPC, << "RpcConnectionImpl::FlushPendingRequests attempted to flush a " << ToString(connected_) << " connection");
return;
default:
LOG_DEBUG(kRPC, << "RpcConnectionImpl::FlushPendingRequests invalid state: " << ToString(connected_));
return;
}
std::shared_ptr<RpcConnection> shared_this = shared_from_this();
auto weak_this = std::weak_ptr<RpcConnection>(shared_this);
auto weak_req = std::weak_ptr<Request>(req);
std::shared_ptr<std::string> payload = std::make_shared<std::string>();
req->GetPacket(payload.get());
if (!payload->empty()) {
assert(requests_on_fly_.find(req->call_id()) == requests_on_fly_.end());
requests_on_fly_[req->call_id()] = req;
request_over_the_wire_ = req;
req->timer().expires_from_now(
std::chrono::milliseconds(options_.rpc_timeout));
req->timer().async_wait([weak_this, weak_req, this](const ::asio::error_code &ec) {
auto timeout_this = weak_this.lock();
auto timeout_req = weak_req.lock();
if (timeout_this && timeout_req)
this->HandleRpcTimeout(timeout_req, ec);
});
asio::async_write(socket_, asio::buffer(*payload),
[shared_this, this, payload](const ::asio::error_code &ec,
size_t size) {
OnSendCompleted(ec, size);
});
} else { // Nothing to send for this request, inform the handler immediately
io_service().post(
// Never hold locks when calling a callback
[req]() { req->OnResponseArrived(nullptr, Status::OK()); }
);
// Reschedule to flush the next one
AsyncFlushPendingRequests();
}
}
template <class Socket>
void RpcConnectionImpl<Socket>::OnRecvCompleted(const ::asio::error_code &original_ec,
size_t) {
using std::placeholders::_1;
using std::placeholders::_2;
std::lock_guard<std::mutex> state_lock(connection_state_lock_);
::asio::error_code my_ec(original_ec);
LOG_TRACE(kRPC, << "RpcConnectionImpl::OnRecvCompleted called");
std::shared_ptr<RpcConnection> shared_this = shared_from_this();
if(event_handlers_) {
event_response event_resp = event_handlers_->call(FS_NN_READ_EVENT, cluster_name_.c_str(), 0);
#ifndef LIBHDFSPP_SIMULATE_ERROR_DISABLED
if (event_resp.response() == event_response::kTest_Error) {
my_ec = std::make_error_code(std::errc::network_down);
}
#endif
}
switch (my_ec.value()) {
case 0:
// No errors
break;
case asio::error::operation_aborted:
// The event loop has been shut down. Ignore the error.
return;
default:
LOG_WARN(kRPC, << "Network error during RPC read: " << my_ec.message());
CommsError(ToStatus(my_ec));
return;
}
if (!current_response_state_) { /* start a new one */
current_response_state_ = std::make_shared<Response>();
}
if (current_response_state_->state_ == Response::kReadLength) {
current_response_state_->state_ = Response::kReadContent;
auto buf = ::asio::buffer(reinterpret_cast<char *>(&current_response_state_->length_),
sizeof(current_response_state_->length_));
asio::async_read(
socket_, buf,
[shared_this, this](const ::asio::error_code &ec, size_t size) {
OnRecvCompleted(ec, size);
});
} else if (current_response_state_->state_ == Response::kReadContent) {
current_response_state_->state_ = Response::kParseResponse;
current_response_state_->length_ = ntohl(current_response_state_->length_);
current_response_state_->data_.resize(current_response_state_->length_);
asio::async_read(
socket_, ::asio::buffer(current_response_state_->data_),
[shared_this, this](const ::asio::error_code &ec, size_t size) {
OnRecvCompleted(ec, size);
});
} else if (current_response_state_->state_ == Response::kParseResponse) {
// Check return status from the RPC response. We may have received a msg
// indicating a server side error.
Status stat = HandleRpcResponse(current_response_state_);
if(stat.get_server_exception_type() == Status::kStandbyException) {
// May need to bail out, connect to new NN, and restart loop
LOG_INFO(kRPC, << "Communicating with standby NN, attempting to reconnect");
}
current_response_state_ = nullptr;
StartReading();
}
}
template <class Socket>
void RpcConnectionImpl<Socket>::Disconnect() {
assert(lock_held(connection_state_lock_)); // Must be holding lock before calling
LOG_INFO(kRPC, << "RpcConnectionImpl::Disconnect called");
request_over_the_wire_.reset();
if (connected_ == kConnecting || connected_ == kHandshaking || connected_ == kAuthenticating || connected_ == kConnected) {
// Don't print out errors, we were expecting a disconnect here
SafeDisconnect(get_asio_socket_ptr(&socket_));
}
connected_ = kDisconnected;
}
}
#endif
} // end namespace hdfs
#endif // end include Guard

121
hadoop-hdfs-project/hadoop-hdfs-native-client/src/main/native/libhdfspp/lib/rpc/rpc_connection.cc → hadoop-hdfs-project/hadoop-hdfs-native-client/src/main/native/libhdfspp/lib/rpc/rpc_connection_impl.cc
View File

@ -16,17 +16,13 @@
* limitations under the License.
*/
#include "rpc_engine.h"
#include "rpc_connection_impl.h"
#include "sasl_protocol.h"
#include "RpcHeader.pb.h"
#include "ProtobufRpcEngine.pb.h"
#include "IpcConnectionContext.pb.h"
#include "common/logging.h"
#include "common/util.h"
#include <asio/read.hpp>
namespace hdfs {
namespace pb = ::google::protobuf;
@ -70,121 +66,8 @@ static void AddHeadersToPacket(
}
}
static void ConstructPayload(std::string *res, const pb::MessageLite *header) {
int len = DelimitedPBMessageSize(header);
res->reserve(len);
pbio::StringOutputStream ss(res);
pbio::CodedOutputStream os(&ss);
uint8_t *buf = os.GetDirectBufferForNBytesAndAdvance(len);
assert(buf);
buf = pbio::CodedOutputStream::WriteVarint32ToArray(header->ByteSize(), buf);
buf = header->SerializeWithCachedSizesToArray(buf);
}
static void ConstructPayload(std::string *res, const std::string *request) {
int len =
pbio::CodedOutputStream::VarintSize32(request->size()) + request->size();
res->reserve(len);
pbio::StringOutputStream ss(res);
pbio::CodedOutputStream os(&ss);
uint8_t *buf = os.GetDirectBufferForNBytesAndAdvance(len);
assert(buf);
buf = pbio::CodedOutputStream::WriteVarint32ToArray(request->size(), buf);
buf = os.WriteStringToArray(*request, buf);
}
static void SetRequestHeader(LockFreeRpcEngine *engine, int call_id,
const std::string &method_name, int retry_count,
RpcRequestHeaderProto *rpc_header,
RequestHeaderProto *req_header) {
rpc_header->set_rpckind(RPC_PROTOCOL_BUFFER);
rpc_header->set_rpcop(RpcRequestHeaderProto::RPC_FINAL_PACKET);
rpc_header->set_callid(call_id);
if (retry_count != kNoRetry)
rpc_header->set_retrycount(retry_count);
rpc_header->set_clientid(engine->client_id());
req_header->set_methodname(method_name);
req_header->set_declaringclassprotocolname(engine->protocol_name());
req_header->set_clientprotocolversion(engine->protocol_version());
}
RpcConnection::~RpcConnection() {}
Request::Request(LockFreeRpcEngine *engine, const std::string &method_name, int call_id,
const std::string &request, Handler &&handler)
: engine_(engine),
method_name_(method_name),
call_id_(call_id),
timer_(engine->io_service()),
handler_(std::move(handler)),
retry_count_(engine->retry_policy() ? 0 : kNoRetry),
failover_count_(0) {
ConstructPayload(&payload_, &request);
}
Request::Request(LockFreeRpcEngine *engine, const std::string &method_name, int call_id,
const pb::MessageLite *request, Handler &&handler)
: engine_(engine),
method_name_(method_name),
call_id_(call_id),
timer_(engine->io_service()),
handler_(std::move(handler)),
retry_count_(engine->retry_policy() ? 0 : kNoRetry),
failover_count_(0) {
ConstructPayload(&payload_, request);
}
Request::Request(LockFreeRpcEngine *engine, Handler &&handler)
: engine_(engine),
call_id_(-1),
timer_(engine->io_service()),
handler_(std::move(handler)),
retry_count_(engine->retry_policy() ? 0 : kNoRetry),
failover_count_(0) {
}
void Request::GetPacket(std::string *res) const {
LOG_TRACE(kRPC, << "Request::GetPacket called");
if (payload_.empty())
return;
RpcRequestHeaderProto rpc_header;
RequestHeaderProto req_header;
SetRequestHeader(engine_, call_id_, method_name_, retry_count_, &rpc_header,
&req_header);
// SASL messages don't have a request header
if (method_name_ != SASL_METHOD_NAME)
AddHeadersToPacket(res, {&rpc_header, &req_header}, &payload_);
else
AddHeadersToPacket(res, {&rpc_header}, &payload_);
}
void Request::OnResponseArrived(pbio::CodedInputStream *is,
const Status &status) {
LOG_TRACE(kRPC, << "Request::OnResponseArrived called");
handler_(is, status);
}
std::string Request::GetDebugString() const {
// Basic description of this object, aimed at debugging
std::stringstream ss;
ss << "\nRequest Object:\n";
ss << "\tMethod name = \"" << method_name_ << "\"\n";
ss << "\tCall id = " << call_id_ << "\n";
ss << "\tRetry Count = " << retry_count_ << "\n";
ss << "\tFailover count = " << failover_count_ << "\n";
return ss.str();
}
int Request::IncrementFailoverCount() {
// reset retry count when failing over
retry_count_ = 0;
return failover_count_++;
}
RpcConnection::RpcConnection(LockFreeRpcEngine *engine)
: engine_(engine),
connected_(kNotYetConnected) {}
@ -560,4 +443,4 @@ std::string RpcConnection::ToString(ConnectedState connected) {
}
}
}
}// end namespace hdfs

445
hadoop-hdfs-project/hadoop-hdfs-native-client/src/main/native/libhdfspp/lib/rpc/rpc_connection_impl.h Normal file
View File

@ -0,0 +1,445 @@
/**
* 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.
*/
#ifndef LIB_RPC_RPC_CONNECTION_IMPL_H_
#define LIB_RPC_RPC_CONNECTION_IMPL_H_
#include "rpc_connection.h"
#include "rpc_engine.h"
#include "request.h"
#include "common/auth_info.h"
#include "common/logging.h"
#include "common/util.h"
#include "common/libhdfs_events_impl.h"
#include <asio/connect.hpp>
#include <asio/read.hpp>
#include <asio/write.hpp>
#include <system_error>
namespace hdfs {
template <class Socket>
class RpcConnectionImpl : public RpcConnection {
public:
MEMCHECKED_CLASS(RpcConnectionImpl);
RpcConnectionImpl(RpcEngine *engine);
virtual ~RpcConnectionImpl() override;
virtual void Connect(const std::vector<::asio::ip::tcp::endpoint> &server,
const AuthInfo & auth_info,
RpcCallback &handler);
virtual void ConnectAndFlush(
const std::vector<::asio::ip::tcp::endpoint> &server) override;
virtual void SendHandshake(RpcCallback &handler) override;
virtual void SendContext(RpcCallback &handler) override;
virtual void Disconnect() override;
virtual void OnSendCompleted(const ::asio::error_code &ec,
size_t transferred) override;
virtual void OnRecvCompleted(const ::asio::error_code &ec,
size_t transferred) override;
virtual void FlushPendingRequests() override;
Socket &TEST_get_mutable_socket() { return socket_; }
void TEST_set_connected(bool connected) { connected_ = connected ? kConnected : kNotYetConnected; }
private:
const Options options_;
::asio::ip::tcp::endpoint current_endpoint_;
std::vector<::asio::ip::tcp::endpoint> additional_endpoints_;
Socket socket_;
::asio::deadline_timer connect_timer_;
void ConnectComplete(const ::asio::error_code &ec, const ::asio::ip::tcp::endpoint &remote);
};
template <class Socket>
RpcConnectionImpl<Socket>::RpcConnectionImpl(RpcEngine *engine)
: RpcConnection(engine),
options_(engine->options()),
socket_(engine->io_service()),
connect_timer_(engine->io_service())
{
LOG_TRACE(kRPC, << "RpcConnectionImpl::RpcConnectionImpl called &" << (void*)this);
}
template <class Socket>
RpcConnectionImpl<Socket>::~RpcConnectionImpl() {
LOG_DEBUG(kRPC, << "RpcConnectionImpl::~RpcConnectionImpl called &" << (void*)this);
if (pending_requests_.size() > 0)
LOG_WARN(kRPC, << "RpcConnectionImpl::~RpcConnectionImpl called with items in the pending queue");
if (requests_on_fly_.size() > 0)
LOG_WARN(kRPC, << "RpcConnectionImpl::~RpcConnectionImpl called with items in the requests_on_fly queue");
}
template <class Socket>
void RpcConnectionImpl<Socket>::Connect(
const std::vector<::asio::ip::tcp::endpoint> &server,
const AuthInfo & auth_info,
RpcCallback &handler) {
LOG_TRACE(kRPC, << "RpcConnectionImpl::Connect called");
this->auth_info_ = auth_info;
auto connectionSuccessfulReq = std::make_shared<Request>(
engine_, [handler](::google::protobuf::io::CodedInputStream *is,
const Status &status) {
(void)is;
handler(status);
});
pending_requests_.push_back(connectionSuccessfulReq);
this->ConnectAndFlush(server); // need "this" so compiler can infer type of CAF
}
template <class Socket>
void RpcConnectionImpl<Socket>::ConnectAndFlush(
const std::vector<::asio::ip::tcp::endpoint> &server) {
LOG_INFO(kRPC, << "ConnectAndFlush called");
std::lock_guard<std::mutex> state_lock(connection_state_lock_);
if (server.empty()) {
Status s = Status::InvalidArgument("No endpoints provided");
CommsError(s);
return;
}
if (connected_ == kConnected) {
FlushPendingRequests();
return;
}
if (connected_ != kNotYetConnected) {
LOG_WARN(kRPC, << "RpcConnectionImpl::ConnectAndFlush called while connected=" << ToString(connected_));
return;
}
connected_ = kConnecting;
// Take the first endpoint, but remember the alternatives for later
additional_endpoints_ = server;
::asio::ip::tcp::endpoint first_endpoint = additional_endpoints_.front();
additional_endpoints_.erase(additional_endpoints_.begin());
current_endpoint_ = first_endpoint;
auto shared_this = shared_from_this();
socket_.async_connect(first_endpoint, [shared_this, this, first_endpoint](const ::asio::error_code &ec) {
ConnectComplete(ec, first_endpoint);
});
// Prompt the timer to timeout
auto weak_this = std::weak_ptr<RpcConnection>(shared_this);
connect_timer_.expires_from_now(
std::chrono::milliseconds(options_.rpc_connect_timeout));
connect_timer_.async_wait([shared_this, this, first_endpoint](const ::asio::error_code &ec) {
if (ec)
ConnectComplete(ec, first_endpoint);
else
ConnectComplete(make_error_code(asio::error::host_unreachable), first_endpoint);
});
}
template <class Socket>
void RpcConnectionImpl<Socket>::ConnectComplete(const ::asio::error_code &ec, const ::asio::ip::tcp::endpoint & remote) {
auto shared_this = RpcConnectionImpl<Socket>::shared_from_this();
std::lock_guard<std::mutex> state_lock(connection_state_lock_);
connect_timer_.cancel();
LOG_TRACE(kRPC, << "RpcConnectionImpl::ConnectComplete called");
// Could be an old async connect returning a result after we've moved on
if (remote != current_endpoint_) {
LOG_DEBUG(kRPC, << "Got ConnectComplete for " << remote << " but current_endpoint_ is " << current_endpoint_);
return;
}
if (connected_ != kConnecting) {
LOG_DEBUG(kRPC, << "Got ConnectComplete but current state is " << connected_);;
return;
}
Status status = ToStatus(ec);
if(event_handlers_) {
event_response event_resp = event_handlers_->call(FS_NN_CONNECT_EVENT, cluster_name_.c_str(), 0);
#ifndef LIBHDFSPP_SIMULATE_ERROR_DISABLED
if (event_resp.response() == event_response::kTest_Error) {
status = event_resp.status();
}
#endif
}
if (status.ok()) {
StartReading();
SendHandshake([shared_this, this](const Status & s) {
HandshakeComplete(s);
});
} else {
LOG_DEBUG(kRPC, << "Rpc connection failed; err=" << status.ToString());;
std::string err = SafeDisconnect(get_asio_socket_ptr(&socket_));
if(!err.empty()) {
LOG_INFO(kRPC, << "Rpc connection failed to connect to endpoint, error closing connection: " << err);
}
if (!additional_endpoints_.empty()) {
// If we have additional endpoints, keep trying until we either run out or
// hit one
::asio::ip::tcp::endpoint next_endpoint = additional_endpoints_.front();
additional_endpoints_.erase(additional_endpoints_.begin());
current_endpoint_ = next_endpoint;
socket_.async_connect(next_endpoint, [shared_this, this, next_endpoint](const ::asio::error_code &ec) {
ConnectComplete(ec, next_endpoint);
});
connect_timer_.expires_from_now(
std::chrono::milliseconds(options_.rpc_connect_timeout));
connect_timer_.async_wait([shared_this, this, next_endpoint](const ::asio::error_code &ec) {
if (ec)
ConnectComplete(ec, next_endpoint);
else
ConnectComplete(make_error_code(asio::error::host_unreachable), next_endpoint);
});
} else {
CommsError(status);
}
}
}
template <class Socket>
void RpcConnectionImpl<Socket>::SendHandshake(RpcCallback &handler) {
assert(lock_held(connection_state_lock_)); // Must be holding lock before calling
LOG_TRACE(kRPC, << "RpcConnectionImpl::SendHandshake called");
connected_ = kHandshaking;
auto shared_this = shared_from_this();
auto handshake_packet = PrepareHandshakePacket();
::asio::async_write(socket_, asio::buffer(*handshake_packet),
[handshake_packet, handler, shared_this, this](
const ::asio::error_code &ec, size_t) {
Status status = ToStatus(ec);
handler(status);
});
}
template <class Socket>
void RpcConnectionImpl<Socket>::SendContext(RpcCallback &handler) {
assert(lock_held(connection_state_lock_)); // Must be holding lock before calling
LOG_TRACE(kRPC, << "RpcConnectionImpl::SendContext called");
auto shared_this = shared_from_this();
auto context_packet = PrepareContextPacket();
::asio::async_write(socket_, asio::buffer(*context_packet),
[context_packet, handler, shared_this, this](
const ::asio::error_code &ec, size_t) {
Status status = ToStatus(ec);
handler(status);
});
}
template <class Socket>
void RpcConnectionImpl<Socket>::OnSendCompleted(const ::asio::error_code &ec,
size_t) {
using std::placeholders::_1;
using std::placeholders::_2;
std::lock_guard<std::mutex> state_lock(connection_state_lock_);
LOG_TRACE(kRPC, << "RpcConnectionImpl::OnSendCompleted called");
request_over_the_wire_.reset();
if (ec) {
LOG_WARN(kRPC, << "Network error during RPC write: " << ec.message());
CommsError(ToStatus(ec));
return;
}
FlushPendingRequests();
}
template <class Socket>
void RpcConnectionImpl<Socket>::FlushPendingRequests() {
using namespace ::std::placeholders;
// Lock should be held
assert(lock_held(connection_state_lock_));
LOG_TRACE(kRPC, << "RpcConnectionImpl::FlushPendingRequests called");
// Don't send if we don't need to
if (request_over_the_wire_) {
return;
}
std::shared_ptr<Request> req;
switch (connected_) {
case kNotYetConnected:
return;
case kConnecting:
return;
case kHandshaking:
return;
case kAuthenticating:
if (auth_requests_.empty()) {
return;
}
req = auth_requests_.front();
auth_requests_.erase(auth_requests_.begin());
break;
case kConnected:
if (pending_requests_.empty()) {
return;
}
req = pending_requests_.front();
pending_requests_.erase(pending_requests_.begin());
break;
case kDisconnected:
LOG_DEBUG(kRPC, << "RpcConnectionImpl::FlushPendingRequests attempted to flush a " << ToString(connected_) << " connection");
return;
default:
LOG_DEBUG(kRPC, << "RpcConnectionImpl::FlushPendingRequests invalid state: " << ToString(connected_));
return;
}
std::shared_ptr<RpcConnection> shared_this = shared_from_this();
auto weak_this = std::weak_ptr<RpcConnection>(shared_this);
auto weak_req = std::weak_ptr<Request>(req);
std::shared_ptr<std::string> payload = std::make_shared<std::string>();
req->GetPacket(payload.get());
if (!payload->empty()) {
assert(requests_on_fly_.find(req->call_id()) == requests_on_fly_.end());
requests_on_fly_[req->call_id()] = req;
request_over_the_wire_ = req;
req->timer().expires_from_now(
std::chrono::milliseconds(options_.rpc_timeout));
req->timer().async_wait([weak_this, weak_req, this](const ::asio::error_code &ec) {
auto timeout_this = weak_this.lock();
auto timeout_req = weak_req.lock();
if (timeout_this && timeout_req)
this->HandleRpcTimeout(timeout_req, ec);
});
asio::async_write(socket_, asio::buffer(*payload),
[shared_this, this, payload](const ::asio::error_code &ec,
size_t size) {
OnSendCompleted(ec, size);
});
} else { // Nothing to send for this request, inform the handler immediately
io_service().post(
// Never hold locks when calling a callback
[req]() { req->OnResponseArrived(nullptr, Status::OK()); }
);
// Reschedule to flush the next one
AsyncFlushPendingRequests();
}
}
template <class Socket>
void RpcConnectionImpl<Socket>::OnRecvCompleted(const ::asio::error_code &original_ec,
size_t) {
using std::placeholders::_1;
using std::placeholders::_2;
std::lock_guard<std::mutex> state_lock(connection_state_lock_);
::asio::error_code my_ec(original_ec);
LOG_TRACE(kRPC, << "RpcConnectionImpl::OnRecvCompleted called");
std::shared_ptr<RpcConnection> shared_this = shared_from_this();
if(event_handlers_) {
event_response event_resp = event_handlers_->call(FS_NN_READ_EVENT, cluster_name_.c_str(), 0);
#ifndef LIBHDFSPP_SIMULATE_ERROR_DISABLED
if (event_resp.response() == event_response::kTest_Error) {
my_ec = std::make_error_code(std::errc::network_down);
}
#endif
}
switch (my_ec.value()) {
case 0:
// No errors
break;
case asio::error::operation_aborted:
// The event loop has been shut down. Ignore the error.
return;
default:
LOG_WARN(kRPC, << "Network error during RPC read: " << my_ec.message());
CommsError(ToStatus(my_ec));
return;
}
if (!current_response_state_) { /* start a new one */
current_response_state_ = std::make_shared<Response>();
}
if (current_response_state_->state_ == Response::kReadLength) {
current_response_state_->state_ = Response::kReadContent;
auto buf = ::asio::buffer(reinterpret_cast<char *>(&current_response_state_->length_),
sizeof(current_response_state_->length_));
asio::async_read(
socket_, buf,
[shared_this, this](const ::asio::error_code &ec, size_t size) {
OnRecvCompleted(ec, size);
});
} else if (current_response_state_->state_ == Response::kReadContent) {
current_response_state_->state_ = Response::kParseResponse;
current_response_state_->length_ = ntohl(current_response_state_->length_);
current_response_state_->data_.resize(current_response_state_->length_);
asio::async_read(
socket_, ::asio::buffer(current_response_state_->data_),
[shared_this, this](const ::asio::error_code &ec, size_t size) {
OnRecvCompleted(ec, size);
});
} else if (current_response_state_->state_ == Response::kParseResponse) {
// Check return status from the RPC response. We may have received a msg
// indicating a server side error.
Status stat = HandleRpcResponse(current_response_state_);
if(stat.get_server_exception_type() == Status::kStandbyException) {
// May need to bail out, connect to new NN, and restart loop
LOG_INFO(kRPC, << "Communicating with standby NN, attempting to reconnect");
}
current_response_state_ = nullptr;
StartReading();
}
}
template <class Socket>
void RpcConnectionImpl<Socket>::Disconnect() {
assert(lock_held(connection_state_lock_)); // Must be holding lock before calling
LOG_INFO(kRPC, << "RpcConnectionImpl::Disconnect called");
request_over_the_wire_.reset();
if (connected_ == kConnecting || connected_ == kHandshaking || connected_ == kAuthenticating || connected_ == kConnected) {
// Don't print out errors, we were expecting a disconnect here
SafeDisconnect(get_asio_socket_ptr(&socket_));
}
connected_ = kDisconnected;
}
}
#endif

125
hadoop-hdfs-project/hadoop-hdfs-native-client/src/main/native/libhdfspp/lib/rpc/rpc_engine.cc
View File

@ -16,13 +16,12 @@
* limitations under the License.
*/
#include "rpc_engine.h"
#include "rpc_connection.h"
#include "rpc_connection_impl.h"
#include "common/util.h"
#include "common/logging.h"
#include "common/namenode_info.h"
#include "optional.hpp"
#include <future>
#include <algorithm>
namespace hdfs {
@ -30,114 +29,6 @@ namespace hdfs {
template <class T>
using optional = std::experimental::optional<T>;
HANamenodeTracker::HANamenodeTracker(const std::vector<ResolvedNamenodeInfo> &servers,
::asio::io_service *ioservice,
std::shared_ptr<LibhdfsEvents> event_handlers)
: enabled_(false), resolved_(false),
ioservice_(ioservice), event_handlers_(event_handlers)
{
LOG_TRACE(kRPC, << "HANamenodeTracker got the following nodes");
for(unsigned int i=0;i<servers.size();i++)
LOG_TRACE(kRPC, << servers[i].str());
if(servers.size() >= 2) {
LOG_TRACE(kRPC, << "Creating HA namenode tracker");
if(servers.size() > 2) {
LOG_WARN(kRPC, << "Nameservice declares more than two nodes. Some won't be used.");
}
active_info_ = servers[0];
standby_info_ = servers[1];
LOG_INFO(kRPC, << "Active namenode url = " << active_info_.uri.str());
LOG_INFO(kRPC, << "Standby namenode url = " << standby_info_.uri.str());
enabled_ = true;
if(!active_info_.endpoints.empty() || !standby_info_.endpoints.empty()) {
resolved_ = true;
}
}
}
HANamenodeTracker::~HANamenodeTracker() { }
static std::string format_endpoints(const std::vector<::asio::ip::tcp::endpoint> &pts) {
std::stringstream ss;
for(unsigned int i=0; i<pts.size(); i++)
if(i == pts.size() - 1)
ss << pts[i];
else
ss << pts[i] << ", ";
return ss.str();
}
// Pass in endpoint from current connection, this will do a reverse lookup
// and return the info for the standby node. It will also swap its state internally.
ResolvedNamenodeInfo HANamenodeTracker::GetFailoverAndUpdate(::asio::ip::tcp::endpoint current_endpoint) {
LOG_TRACE(kRPC, << "Swapping from endpoint " << current_endpoint);
mutex_guard swap_lock(swap_lock_);
ResolvedNamenodeInfo failover_node;
// Connected to standby, switch standby to active
if(IsCurrentActive_locked(current_endpoint)) {
std::swap(active_info_, standby_info_);
if(event_handlers_)
event_handlers_->call(FS_NN_FAILOVER_EVENT, active_info_.nameservice.c_str(),
reinterpret_cast<int64_t>(active_info_.uri.str().c_str()));
failover_node = active_info_;
} else if(IsCurrentStandby_locked(current_endpoint)) {
// Connected to standby
if(event_handlers_)
event_handlers_->call(FS_NN_FAILOVER_EVENT, active_info_.nameservice.c_str(),
reinterpret_cast<int64_t>(active_info_.uri.str().c_str()));
failover_node = active_info_;
} else {
// Invalid state, throw for testing
std::string ep1 = format_endpoints(active_info_.endpoints);
std::string ep2 = format_endpoints(standby_info_.endpoints);
std::stringstream msg;
msg << "Looked for " << current_endpoint << " in\n";
msg << ep1 << " and\n";
msg << ep2 << std::endl;
LOG_ERROR(kRPC, << "Unable to find RPC connection in config " << msg.str() << ". Bailing out.");
throw std::runtime_error(msg.str());
}
if(failover_node.endpoints.empty()) {
LOG_WARN(kRPC, << "No endpoints for node " << failover_node.uri.str() << " attempting to resolve again");
if(!ResolveInPlace(ioservice_, failover_node)) {
LOG_ERROR(kRPC, << "Fallback endpoint resolution for node " << failover_node.uri.str()
<< "failed. Please make sure your configuration is up to date.");
}
}
return failover_node;
}
bool HANamenodeTracker::IsCurrentActive_locked(const ::asio::ip::tcp::endpoint &ep) const {
for(unsigned int i=0;i<active_info_.endpoints.size();i++) {
if(ep.address() == active_info_.endpoints[i].address()) {
if(ep.port() != active_info_.endpoints[i].port())
LOG_WARN(kRPC, << "Port mismatch: " << ep << " vs " << active_info_.endpoints[i] << " trying anyway..");
return true;
}
}
return false;
}
bool HANamenodeTracker::IsCurrentStandby_locked(const ::asio::ip::tcp::endpoint &ep) const {
for(unsigned int i=0;i<standby_info_.endpoints.size();i++) {
if(ep.address() == standby_info_.endpoints[i].address()) {
if(ep.port() != standby_info_.endpoints[i].port())
LOG_WARN(kRPC, << "Port mismatch: " << ep << " vs " << standby_info_.endpoints[i] << " trying anyway..");
return true;
}
}
return false;
}
RpcEngine::RpcEngine(::asio::io_service *io_service, const Options &options,
const std::string &client_name, const std::string &user_name,
@ -276,19 +167,6 @@ void RpcEngine::AsyncRpc(
conn_->AsyncRpc(method_name, req, resp, handler);
}
Status RpcEngine::Rpc(
const std::string &method_name, const ::google::protobuf::MessageLite *req,
const std::shared_ptr<::google::protobuf::MessageLite> &resp) {
LOG_TRACE(kRPC, << "RpcEngine::Rpc called");
auto stat = std::make_shared<std::promise<Status>>();
std::future<Status> future(stat->get_future());
AsyncRpc(method_name, req, resp,
[stat](const Status &status) { stat->set_value(status); });
return future.get();
}
std::shared_ptr<RpcConnection> RpcEngine::NewConnection()
{
LOG_DEBUG(kRPC, << "RpcEngine::NewConnection called");
@ -304,7 +182,6 @@ std::shared_ptr<RpcConnection> RpcEngine::InitializeConnection()
return result;
}
void RpcEngine::AsyncRpcCommsError(
const Status &status,
std::shared_ptr<RpcConnection> failedConnection,

250
hadoop-hdfs-project/hadoop-hdfs-native-client/src/main/native/libhdfspp/lib/rpc/rpc_engine.h
View File

@ -25,25 +25,19 @@
#include "common/retry_policy.h"
#include "common/libhdfs_events_impl.h"
#include "common/util.h"
#include "common/continuation/asio.h"
#include "common/logging.h"
#include "common/new_delete.h"
#include "common/namenode_info.h"
#include "namenode_tracker.h"
#include <google/protobuf/message_lite.h>
#include <google/protobuf/io/coded_stream.h>
#include <google/protobuf/io/zero_copy_stream_impl_lite.h>
#include <asio/ip/tcp.hpp>
#include <asio/deadline_timer.hpp>
#include <atomic>
#include <memory>
#include <unordered_map>
#include <vector>
#include <deque>
#include <mutex>
#include <future>
namespace hdfs {
@ -64,193 +58,8 @@ typedef const std::function<void(const Status &)> RpcCallback;
class LockFreeRpcEngine;
class RpcConnection;
class SaslProtocol;
/*
* Internal bookkeeping for an outstanding request from the consumer.
*
* Threading model: not thread-safe; should only be accessed from a single
* thread at a time
*/
class Request {
public:
MEMCHECKED_CLASS(Request)
typedef std::function<void(::google::protobuf::io::CodedInputStream *is,
const Status &status)> Handler;
Request(LockFreeRpcEngine *engine, const std::string &method_name, int call_id,
const std::string &request, Handler &&callback);
Request(LockFreeRpcEngine *engine, const std::string &method_name, int call_id,
const ::google::protobuf::MessageLite *request, Handler &&callback);
// Null request (with no actual message) used to track the state of an
// initial Connect call
Request(LockFreeRpcEngine *engine, Handler &&handler);
int call_id() const { return call_id_; }
std::string method_name() const { return method_name_; }
::asio::deadline_timer &timer() { return timer_; }
int IncrementRetryCount() { return retry_count_++; }
int IncrementFailoverCount();
void GetPacket(std::string *res) const;
void OnResponseArrived(::google::protobuf::io::CodedInputStream *is,
const Status &status);
int get_failover_count() {return failover_count_;}
std::string GetDebugString() const;
private:
LockFreeRpcEngine *const engine_;
const std::string method_name_;
const int call_id_;
::asio::deadline_timer timer_;
std::string payload_;
const Handler handler_;
int retry_count_;
int failover_count_;
};
/*
* Encapsulates a persistent connection to the NameNode, and the sending of
* RPC requests and evaluating their responses.
*
* Can have multiple RPC requests in-flight simultaneously, but they are
* evaluated in-order on the server side in a blocking manner.
*
* Threading model: public interface is thread-safe
* All handlers passed in to method calls will be called from an asio thread,
* and will not be holding any internal RpcConnection locks.
*/
class RpcConnection : public std::enable_shared_from_this<RpcConnection> {
public:
MEMCHECKED_CLASS(RpcConnection)
RpcConnection(LockFreeRpcEngine *engine);
virtual ~RpcConnection();
// Note that a single server can have multiple endpoints - especially both
// an ipv4 and ipv6 endpoint
virtual void Connect(const std::vector<::asio::ip::tcp::endpoint> &server,
const AuthInfo & auth_info,
RpcCallback &handler) = 0;
virtual void ConnectAndFlush(const std::vector<::asio::ip::tcp::endpoint> &server) = 0;
virtual void Disconnect() = 0;
void StartReading();
void AsyncRpc(const std::string &method_name,
const ::google::protobuf::MessageLite *req,
std::shared_ptr<::google::protobuf::MessageLite> resp,
const RpcCallback &handler);
void AsyncRpc(const std::vector<std::shared_ptr<Request> > & requests);
// Enqueue requests before the connection is connected. Will be flushed
// on connect
void PreEnqueueRequests(std::vector<std::shared_ptr<Request>> requests);
// Put requests at the front of the current request queue
void PrependRequests_locked(std::vector<std::shared_ptr<Request>> requests);
void SetEventHandlers(std::shared_ptr<LibhdfsEvents> event_handlers);
void SetClusterName(std::string cluster_name);
LockFreeRpcEngine *engine() { return engine_; }
::asio::io_service &io_service();
protected:
struct Response {
enum ResponseState {
kReadLength,
kReadContent,
kParseResponse,
} state_;
unsigned length_;
std::vector<char> data_;
std::unique_ptr<::google::protobuf::io::ArrayInputStream> ar;
std::unique_ptr<::google::protobuf::io::CodedInputStream> in;
Response() : state_(kReadLength), length_(0) {}
};
// Initial handshaking protocol: connect->handshake-->(auth)?-->context->connected
virtual void SendHandshake(RpcCallback &handler) = 0;
void HandshakeComplete(const Status &s);
void AuthComplete(const Status &s, const AuthInfo & new_auth_info);
void AuthComplete_locked(const Status &s, const AuthInfo & new_auth_info);
virtual void SendContext(RpcCallback &handler) = 0;
void ContextComplete(const Status &s);
virtual void OnSendCompleted(const ::asio::error_code &ec,
size_t transferred) = 0;
virtual void OnRecvCompleted(const ::asio::error_code &ec,
size_t transferred) = 0;
virtual void FlushPendingRequests()=0; // Synchronously write the next request
void AsyncRpc_locked(
const std::string &method_name,
const ::google::protobuf::MessageLite *req,
std::shared_ptr<::google::protobuf::MessageLite> resp,
const RpcCallback &handler);
void SendRpcRequests(const std::vector<std::shared_ptr<Request> > & requests);
void AsyncFlushPendingRequests(); // Queue requests to be flushed at a later time
std::shared_ptr<std::string> PrepareHandshakePacket();
std::shared_ptr<std::string> PrepareContextPacket();
static std::string SerializeRpcRequest(
const std::string &method_name,
const ::google::protobuf::MessageLite *req);
Status HandleRpcResponse(std::shared_ptr<Response> response);
void HandleRpcTimeout(std::shared_ptr<Request> req,
const ::asio::error_code &ec);
void CommsError(const Status &status);
void ClearAndDisconnect(const ::asio::error_code &ec);
std::shared_ptr<Request> RemoveFromRunningQueue(int call_id);
LockFreeRpcEngine *const engine_;
std::shared_ptr<Response> current_response_state_;
AuthInfo auth_info_;
// Connection can have deferred connection, especially when we're pausing
// during retry
enum ConnectedState {
kNotYetConnected,
kConnecting,
kHandshaking,
kAuthenticating,
kConnected,
kDisconnected
};
static std::string ToString(ConnectedState connected);
ConnectedState connected_;
// State machine for performing a SASL handshake
std::shared_ptr<SaslProtocol> sasl_protocol_;
// The request being sent over the wire; will also be in requests_on_fly_
std::shared_ptr<Request> request_over_the_wire_;
// Requests to be sent over the wire
std::deque<std::shared_ptr<Request>> pending_requests_;
// Requests to be sent over the wire during authentication; not retried if
// there is a connection error
std::deque<std::shared_ptr<Request>> auth_requests_;
// Requests that are waiting for responses
typedef std::unordered_map<int, std::shared_ptr<Request>> RequestOnFlyMap;
RequestOnFlyMap requests_on_fly_;
std::shared_ptr<LibhdfsEvents> event_handlers_;
std::string cluster_name_;
// Lock for mutable parts of this class that need to be thread safe
std::mutex connection_state_lock_;
friend class SaslProtocol;
};
class RpcConnection;
class Request;
/*
* These methods of the RpcEngine will never acquire locks, and are safe for
@ -259,6 +68,7 @@ class RpcConnection : public std::enable_shared_from_this<RpcConnection> {
class LockFreeRpcEngine {
public:
MEMCHECKED_CLASS(LockFreeRpcEngine)
/* Enqueues a CommsError without acquiring a lock*/
virtual void AsyncRpcCommsError(const Status &status,
std::shared_ptr<RpcConnection> failedConnection,
@ -278,54 +88,6 @@ public:
};
/*
* Tracker gives the RpcEngine a quick way to use an endpoint that just
* failed in order to lookup a set of endpoints for a failover node.
*
* Note: For now this only deals with 2 NameNodes, but that's the default
* anyway.
*/
class HANamenodeTracker {
public:
HANamenodeTracker(const std::vector<ResolvedNamenodeInfo> &servers,
::asio::io_service *ioservice,
std::shared_ptr<LibhdfsEvents> event_handlers_);
virtual ~HANamenodeTracker();
bool is_enabled() const { return enabled_; }
bool is_resolved() const { return resolved_; }
// Get node opposite of the current one if possible (swaps active/standby)
// Note: This will always mutate internal state. Use IsCurrentActive/Standby to
// get info without changing state
ResolvedNamenodeInfo GetFailoverAndUpdate(::asio::ip::tcp::endpoint current_endpoint);
bool IsCurrentActive_locked(const ::asio::ip::tcp::endpoint &ep) const;
bool IsCurrentStandby_locked(const ::asio::ip::tcp::endpoint &ep) const;
private:
// If HA should be enabled, according to our options and runtime info like # nodes provided
bool enabled_;
// If we were able to resolve at least 1 HA namenode
bool resolved_;
// Keep service in case a second round of DNS lookup is required
::asio::io_service *ioservice_;
// Event handlers, for now this is the simplest place to catch all failover events
// and push info out to client application. Possibly move into RPCEngine.
std::shared_ptr<LibhdfsEvents> event_handlers_;
// Only support 1 active and 1 standby for now.
ResolvedNamenodeInfo active_info_;
ResolvedNamenodeInfo standby_info_;
// Aquire when switching from active-standby
std::mutex swap_lock_;
};
/*
* An engine for reliable communication with a NameNode. Handles connection,
* retry, and (someday) failover of the requested messages.
@ -360,10 +122,6 @@ class RpcEngine : public LockFreeRpcEngine {
const std::shared_ptr<::google::protobuf::MessageLite> &resp,
const std::function<void(const Status &)> &handler);
Status Rpc(const std::string &method_name,
const ::google::protobuf::MessageLite *req,
const std::shared_ptr<::google::protobuf::MessageLite> &resp);
void Shutdown();
/* Enqueues a CommsError without acquiring a lock*/

1
hadoop-hdfs-project/hadoop-hdfs-native-client/src/main/native/libhdfspp/lib/rpc/sasl_protocol.cc
View File

@ -17,6 +17,7 @@
*/
#include "rpc_engine.h"
#include "rpc_connection.h"
#include "common/logging.h"
#include "sasl_engine.h"

2
hadoop-hdfs-project/hadoop-hdfs-native-client/src/main/native/libhdfspp/tests/rpc_engine_test.cc
View File

@ -19,7 +19,7 @@
#include "mock_connection.h"
#include "test.pb.h"
#include "RpcHeader.pb.h"
#include "rpc/rpc_connection.h"
#include "rpc/rpc_connection_impl.h"
#include "common/namenode_info.h"
#include <google/protobuf/io/coded_stream.h>