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/**
* Copyright (C) 2017 MongoDB Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* As a special exception, the copyright holders give permission to link the
* code of portions of this program with the OpenSSL library under certain
* conditions as described in each individual source file and distribute
* linked combinations including the program with the OpenSSL library. You
* must comply with the GNU Affero General Public License in all respects for
* all of the code used other than as permitted herein. If you modify file(s)
* with this exception, you may extend this exception to your version of the
* file(s), but you are not obligated to do so. If you do not wish to do so,
* delete this exception statement from your version. If you delete this
* exception statement from all source files in the program, then also delete
* it in the license file.
*/
#define MONGO_LOG_DEFAULT_COMPONENT mongo::logger::LogComponent::kSharding
#include "mongo/platform/basic.h"
#include "mongo/s/sharding_task_executor.h"
#include "mongo/base/disallow_copying.h"
#include "mongo/base/status_with.h"
#include "mongo/bson/timestamp.h"
#include "mongo/db/logical_time.h"
#include "mongo/db/operation_time_tracker.h"
#include "mongo/executor/thread_pool_task_executor.h"
#include "mongo/rpc/get_status_from_command_result.h"
#include "mongo/rpc/metadata/sharding_metadata.h"
#include "mongo/s/client/shard_registry.h"
#include "mongo/s/cluster_last_error_info.h"
#include "mongo/s/grid.h"
#include "mongo/s/is_mongos.h"
#include "mongo/util/log.h"
#include "mongo/util/scopeguard.h"
namespace mongo {
namespace executor {
namespace {
const std::string kOperationTimeField = "operationTime";
}
ShardingTaskExecutor::ShardingTaskExecutor(std::unique_ptr<ThreadPoolTaskExecutor> executor)
: _executor(std::move(executor)) {}
void ShardingTaskExecutor::startup() {
_executor->startup();
}
void ShardingTaskExecutor::shutdown() {
_executor->shutdown();
}
void ShardingTaskExecutor::join() {
_executor->join();
}
void ShardingTaskExecutor::appendDiagnosticBSON(mongo::BSONObjBuilder* builder) const {
_executor->appendDiagnosticBSON(builder);
}
Date_t ShardingTaskExecutor::now() {
return _executor->now();
}
StatusWith<TaskExecutor::EventHandle> ShardingTaskExecutor::makeEvent() {
return _executor->makeEvent();
}
void ShardingTaskExecutor::signalEvent(const EventHandle& event) {
return _executor->signalEvent(event);
}
StatusWith<TaskExecutor::CallbackHandle> ShardingTaskExecutor::onEvent(const EventHandle& event,
const CallbackFn& work) {
return _executor->onEvent(event, work);
}
void ShardingTaskExecutor::waitForEvent(const EventHandle& event) {
_executor->waitForEvent(event);
}
StatusWith<stdx::cv_status> ShardingTaskExecutor::waitForEvent(OperationContext* opCtx,
const EventHandle& event,
Date_t deadline) {
return _executor->waitForEvent(opCtx, event, deadline);
}
StatusWith<TaskExecutor::CallbackHandle> ShardingTaskExecutor::scheduleWork(
const CallbackFn& work) {
return _executor->scheduleWork(work);
}
StatusWith<TaskExecutor::CallbackHandle> ShardingTaskExecutor::scheduleWorkAt(
Date_t when, const CallbackFn& work) {
return _executor->scheduleWorkAt(when, work);
}
StatusWith<TaskExecutor::CallbackHandle> ShardingTaskExecutor::scheduleRemoteCommand(
const RemoteCommandRequest& request, const RemoteCommandCallbackFn& cb) {
// schedule the user's callback if there is not opCtx
if (!request.opCtx) {
return _executor->scheduleRemoteCommand(request, cb);
}
boost::optional<RemoteCommandRequest> newRequest;
if (request.opCtx->getLogicalSessionId() && !request.cmdObj.hasField("lsid")) {
newRequest.emplace(request);
BSONObjBuilder bob(std::move(newRequest->cmdObj));
{
// TODO SERVER-33702.
BSONObjBuilder subbob(bob.subobjStart("lsid"));
request.opCtx->getLogicalSessionId()->serialize(&subbob);
}
newRequest->cmdObj = bob.obj();
}
std::shared_ptr<OperationTimeTracker> timeTracker = OperationTimeTracker::get(request.opCtx);
auto clusterGLE = ClusterLastErrorInfo::get(request.opCtx->getClient());
auto shardingCb = [timeTracker, clusterGLE, cb](
const TaskExecutor::RemoteCommandCallbackArgs& args) {
ON_BLOCK_EXIT([&cb, &args]() { cb(args); });
// Update replica set monitor info.
auto shard = grid.shardRegistry()->getShardForHostNoReload(args.request.target);
if (!shard) {
LOG(1) << "Could not find shard containing host: " << args.request.target.toString();
}
if (!args.response.isOK()) {
if (isMongos() && args.response.status == ErrorCodes::IncompatibleWithUpgradedServer) {
severe()
<< "This mongos server must be upgraded. It is attempting to communicate with "
"an upgraded cluster with which it is incompatible. Error: '"
<< args.response.status.toString()
<< "' Crashing in order to bring attention to the incompatibility, rather "
"than erroring endlessly.";
fassertNoTrace(50710, false);
}
if (shard) {
shard->updateReplSetMonitor(args.request.target, args.response.status);
}
LOG(1) << "Error processing the remote request, not updating operationTime or gLE";
return;
}
if (shard) {
shard->updateReplSetMonitor(args.request.target,
getStatusFromCommandResult(args.response.data));
}
// Update the logical clock.
invariant(timeTracker);
auto operationTime = args.response.data[kOperationTimeField];
if (!operationTime.eoo()) {
invariant(operationTime.type() == BSONType::bsonTimestamp);
timeTracker->updateOperationTime(LogicalTime(operationTime.timestamp()));
}
// Update getLastError info for the client if we're tracking it.
if (clusterGLE) {
auto swShardingMetadata =
rpc::ShardingMetadata::readFromMetadata(args.response.metadata);
if (swShardingMetadata.isOK()) {
auto shardingMetadata = std::move(swShardingMetadata.getValue());
auto shardConn = ConnectionString::parse(args.request.target.toString());
if (!shardConn.isOK()) {
severe() << "got bad host string in saveGLEStats: " << args.request.target;
}
clusterGLE->addHostOpTime(shardConn.getValue(),
HostOpTime(shardingMetadata.getLastOpTime(),
shardingMetadata.getLastElectionId()));
} else if (swShardingMetadata.getStatus() != ErrorCodes::NoSuchKey) {
warning() << "Got invalid sharding metadata "
<< redact(swShardingMetadata.getStatus()) << " metadata object was '"
<< redact(args.response.metadata) << "'";
}
}
};
return _executor->scheduleRemoteCommand(newRequest ? *newRequest : request, shardingCb);
}
void ShardingTaskExecutor::cancel(const CallbackHandle& cbHandle) {
_executor->cancel(cbHandle);
}
void ShardingTaskExecutor::wait(const CallbackHandle& cbHandle) {
_executor->wait(cbHandle);
}
void ShardingTaskExecutor::appendConnectionStats(ConnectionPoolStats* stats) const {
_executor->appendConnectionStats(stats);
}
} // namespace executor
} // namespace mongo
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