mirror of https://gitee.com/bigwinds/arangodb
145 lines
5.0 KiB
C++
145 lines
5.0 KiB
C++
////////////////////////////////////////////////////////////////////////////////
|
|
/// DISCLAIMER
|
|
///
|
|
/// Copyright 2016 ArangoDB GmbH, Cologne, Germany
|
|
///
|
|
/// Licensed 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.
|
|
///
|
|
/// Copyright holder is ArangoDB GmbH, Cologne, Germany
|
|
///
|
|
/// @author Jan Steemann
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
|
|
#include "ManagerFeature.h"
|
|
|
|
#include "ApplicationFeatures/ApplicationServer.h"
|
|
#include "Basics/FunctionUtils.h"
|
|
#include "Basics/MutexLocker.h"
|
|
#include "Basics/application-exit.h"
|
|
#include "Scheduler/SchedulerFeature.h"
|
|
#include "StorageEngine/EngineSelectorFeature.h"
|
|
#include "StorageEngine/StorageEngine.h"
|
|
#include "Transaction/Manager.h"
|
|
|
|
namespace {
|
|
void queueGarbageCollection(std::mutex& mutex, arangodb::Scheduler::WorkHandle& workItem,
|
|
std::function<void(bool)>& gcfunc) {
|
|
bool queued = false;
|
|
{
|
|
std::lock_guard<std::mutex> guard(mutex);
|
|
std::tie(queued, workItem) =
|
|
arangodb::basics::function_utils::retryUntilTimeout<arangodb::Scheduler::WorkHandle>(
|
|
[&gcfunc]() -> std::pair<bool, arangodb::Scheduler::WorkHandle> {
|
|
auto off = std::chrono::seconds(1);
|
|
return arangodb::SchedulerFeature::SCHEDULER->queueDelay(arangodb::RequestLane::INTERNAL_LOW,
|
|
off, gcfunc);
|
|
},
|
|
arangodb::Logger::TRANSACTIONS,
|
|
"queue transaction garbage collection");
|
|
}
|
|
if (!queued) {
|
|
LOG_TOPIC("f8b3d", FATAL, arangodb::Logger::TRANSACTIONS)
|
|
<< "Failed to queue transaction garbage collection, for 5 minutes, "
|
|
"exiting.";
|
|
FATAL_ERROR_EXIT();
|
|
}
|
|
}
|
|
} // namespace
|
|
|
|
using namespace arangodb::application_features;
|
|
using namespace arangodb::basics;
|
|
using namespace arangodb::options;
|
|
|
|
namespace arangodb {
|
|
namespace transaction {
|
|
|
|
std::unique_ptr<transaction::Manager> ManagerFeature::MANAGER;
|
|
|
|
ManagerFeature::ManagerFeature(application_features::ApplicationServer& server)
|
|
: ApplicationFeature(server, "TransactionManager"), _workItem(nullptr), _gcfunc() {
|
|
setOptional(false);
|
|
startsAfter("BasicsPhase");
|
|
startsAfter("EngineSelector");
|
|
startsAfter("Scheduler");
|
|
startsBefore("Database");
|
|
|
|
_gcfunc = [this] (bool canceled) {
|
|
if (canceled) {
|
|
return;
|
|
}
|
|
|
|
MANAGER->garbageCollect(/*abortAll*/false);
|
|
|
|
if (!ApplicationServer::isStopping()) {
|
|
::queueGarbageCollection(_workItemMutex, _workItem, _gcfunc);
|
|
}
|
|
};
|
|
}
|
|
|
|
void ManagerFeature::prepare() {
|
|
TRI_ASSERT(MANAGER.get() == nullptr);
|
|
TRI_ASSERT(EngineSelectorFeature::ENGINE != nullptr);
|
|
MANAGER = EngineSelectorFeature::ENGINE->createTransactionManager();
|
|
}
|
|
|
|
void ManagerFeature::start() {
|
|
Scheduler* scheduler = SchedulerFeature::SCHEDULER;
|
|
if (scheduler != nullptr) { // is nullptr in catch tests
|
|
::queueGarbageCollection(_workItemMutex, _workItem, _gcfunc);
|
|
}
|
|
}
|
|
|
|
void ManagerFeature::beginShutdown() {
|
|
{
|
|
// when we get here, ApplicationServer::isStopping() will always return
|
|
// true already. So it is ok to wait here until the workItem has been
|
|
// fully canceled. We are grabbing the mutex here, so the workItem cannot
|
|
// reschedule itself if it doesn't have the mutex. If it is executed
|
|
// directly afterwards, it will check isStopping(), which will return
|
|
// false, so no rescheduled will be performed
|
|
// if it doesn't hold the mutex, we will cancel it here (under the mutex)
|
|
// and when the callback is executed, it will check isStopping(), which
|
|
// will always return false
|
|
std::lock_guard<std::mutex> guard(_workItemMutex);
|
|
_workItem.reset();
|
|
}
|
|
|
|
MANAGER->disallowInserts();
|
|
// at this point all cursors should have been aborted already
|
|
MANAGER->garbageCollect(/*abortAll*/true);
|
|
// make sure no lingering managed trx remain
|
|
while (MANAGER->garbageCollect(/*abortAll*/true)) {
|
|
LOG_TOPIC("96298", INFO, Logger::TRANSACTIONS) << "still waiting for managed transaction";
|
|
std::this_thread::sleep_for(std::chrono::seconds(1));
|
|
}
|
|
}
|
|
|
|
void ManagerFeature::stop() {
|
|
// reset again, as there may be a race between beginShutdown and
|
|
// the execution of the deferred _workItem
|
|
{
|
|
std::lock_guard<std::mutex> guard(_workItemMutex);
|
|
_workItem.reset();
|
|
}
|
|
|
|
// at this point all cursors should have been aborted already
|
|
MANAGER->garbageCollect(/*abortAll*/true);
|
|
}
|
|
|
|
void ManagerFeature::unprepare() {
|
|
MANAGER.reset();
|
|
}
|
|
|
|
} // namespace transaction
|
|
} // namespace arangodb
|