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/**
* Copyright (C) 2014 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::kStorage
#include "mongo/platform/basic.h"
#include <boost/thread/mutex.hpp>
#include <set>
#include "mongo/base/checked_cast.h"
#include "mongo/db/catalog/collection.h"
#include "mongo/db/catalog/database.h"
#include "mongo/db/client.h"
#include "mongo/db/concurrency/d_concurrency.h"
#include "mongo/db/db_raii.h"
#include "mongo/db/global_environment_experiment.h"
#include "mongo/db/namespace_string.h"
#include "mongo/db/operation_context_impl.h"
#include "mongo/db/storage/wiredtiger/wiredtiger_kv_engine.h"
#include "mongo/db/storage/wiredtiger/wiredtiger_record_store.h"
#include "mongo/db/storage/wiredtiger/wiredtiger_recovery_unit.h"
#include "mongo/util/background.h"
#include "mongo/util/exit.h"
#include "mongo/util/log.h"
namespace mongo {
namespace {
std::set<NamespaceString> _backgroundThreadNamespaces;
boost::mutex _backgroundThreadMutex;
class WiredTigerRecordStoreThread : public BackgroundJob {
public:
WiredTigerRecordStoreThread(const NamespaceString& ns)
: BackgroundJob(true /* deleteSelf */), _ns(ns) {
_name = std::string("WiredTigerRecordStoreThread for ") + _ns.toString();
}
virtual std::string name() const {
return _name;
}
/**
* @return Number of documents deleted.
*/
int64_t _deleteExcessDocuments() {
if (!getGlobalEnvironment()->getGlobalStorageEngine()) {
LOG(1) << "no global storage engine yet";
return 0;
}
OperationContextImpl txn;
checked_cast<WiredTigerRecoveryUnit*>(txn.recoveryUnit())->markNoTicketRequired();
try {
ScopedTransaction transaction(&txn, MODE_IX);
AutoGetDb autoDb(&txn, _ns.db(), MODE_IX);
Database* db = autoDb.getDb();
if (!db) {
LOG(2) << "no local database yet";
return 0;
}
Lock::CollectionLock collectionLock(txn.lockState(), _ns.ns(), MODE_IX);
Collection* collection = db->getCollection(_ns);
if (!collection) {
LOG(2) << "no collection " << _ns;
return 0;
}
OldClientContext ctx(&txn, _ns, false);
WiredTigerRecordStore* rs =
checked_cast<WiredTigerRecordStore*>(collection->getRecordStore());
WriteUnitOfWork wuow(&txn);
boost::lock_guard<boost::timed_mutex> lock(rs->cappedDeleterMutex());
int64_t removed = rs->cappedDeleteAsNeeded_inlock(&txn, RecordId::max());
wuow.commit();
return removed;
}
catch (const std::exception& e) {
severe() << "error in WiredTigerRecordStoreThread: " << e.what();
fassertFailedNoTrace(!"error in WiredTigerRecordStoreThread");
}
catch (...) {
fassertFailedNoTrace(!"unknown error in WiredTigerRecordStoreThread");
}
}
virtual void run() {
Client::initThread(_name.c_str());
while (!inShutdown()) {
int64_t removed = _deleteExcessDocuments();
LOG(2) << "WiredTigerRecordStoreThread deleted " << removed;
if (removed == 0) {
// If we removed 0 documents, sleep a bit in case we're on a laptop
// or something to be nice.
sleepmillis(1000);
}
else if(removed < 1000) {
// 1000 is the batch size, so we didn't even do a full batch,
// which is the most efficient.
sleepmillis(10);
}
}
cc().shutdown();
log() << "shutting down";
}
private:
NamespaceString _ns;
std::string _name;
};
} // namespace
// static
bool WiredTigerKVEngine::initRsOplogBackgroundThread(StringData ns) {
if (!NamespaceString::oplog(ns)) {
return false;
}
if (storageGlobalParams.repair) {
LOG(1) << "not starting WiredTigerRecordStoreThread for " << ns
<< " because we are in repair";
return false;
}
boost::lock_guard<boost::mutex> lock(_backgroundThreadMutex);
NamespaceString nss(ns);
if (_backgroundThreadNamespaces.count(nss)) {
log() << "WiredTigerRecordStoreThread " << ns << " already started";
}
else {
log() << "Starting WiredTigerRecordStoreThread " << ns;
BackgroundJob* backgroundThread = new WiredTigerRecordStoreThread(nss);
backgroundThread->go();
_backgroundThreadNamespaces.insert(nss);
}
return true;
}
} // namespace mongo
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