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rocks_snapshot_manager.cpp
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rocks_snapshot_manager.cpp
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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 "rocks_snapshot_manager.h"
#include "rocks_recovery_unit.h"
#include <rocksdb/db.h>
#include "mongo/base/checked_cast.h"
#include "mongo/util/log.h"
namespace mongo {
// This only checks invariants
Status RocksSnapshotManager::prepareForCreateSnapshot(OperationContext* txn) {
RocksRecoveryUnit::getRocksRecoveryUnit(txn)->prepareForCreateSnapshot(txn);
return Status::OK();
}
Status RocksSnapshotManager::createSnapshot(OperationContext* txn, const SnapshotName& name) {
stdx::lock_guard<stdx::mutex> lock(_mutex);
uint64_t nameU64 = name.asU64();
_snapshotMap[nameU64] = std::make_shared<SnapshotHolder>(txn, nameU64);
_snapshots.push_back(nameU64);
return Status::OK();
}
void RocksSnapshotManager::setCommittedSnapshot(const SnapshotName& name) {
stdx::lock_guard<stdx::mutex> lock(_mutex);
uint64_t nameU64 = name.asU64();
invariant(!_committedSnapshot || *_committedSnapshot < nameU64);
_committedSnapshot = nameU64;
}
void RocksSnapshotManager::cleanupUnneededSnapshots() {
stdx::lock_guard<stdx::mutex> lock(_mutex);
if (!_committedSnapshot) {
return;
}
auto it = _snapshots.begin();
for (; it != _snapshots.end() && *it != _committedSnapshot; it++) {
auto snapshotHolder = _snapshotMap.find(*it);
// _snapshots and _snapshotMap have to have the same snapshots
invariant(snapshotHolder != _snapshotMap.end());
_snapshotMap.erase(snapshotHolder);
}
invariant(it != _snapshots.end());
_snapshots.erase(_snapshots.begin(), it);
}
void RocksSnapshotManager::dropAllSnapshots() {
stdx::lock_guard<stdx::mutex> lock(_mutex);
_committedSnapshot = boost::none;
_snapshotMap.clear();
_snapshots.clear();
}
bool RocksSnapshotManager::haveCommittedSnapshot() const {
stdx::lock_guard<stdx::mutex> lock(_mutex);
return bool(_committedSnapshot);
}
std::shared_ptr<RocksSnapshotManager::SnapshotHolder>
RocksSnapshotManager::getCommittedSnapshot() const {
stdx::lock_guard<stdx::mutex> lock(_mutex);
uassert(ErrorCodes::ReadConcernMajorityNotAvailableYet,
"Committed view disappeared while running operation", _committedSnapshot);
return _snapshotMap.at(*_committedSnapshot);
}
RocksSnapshotManager::SnapshotHolder::SnapshotHolder(OperationContext* opCtx, uint64_t name_) {
name = name_;
auto rru = RocksRecoveryUnit::getRocksRecoveryUnit(opCtx);
snapshot = rru->getPreparedSnapshot();
db = rru->getDB();
}
RocksSnapshotManager::SnapshotHolder::~SnapshotHolder() {
if (snapshot != nullptr) {
invariant(db != nullptr);
db->ReleaseSnapshot(snapshot);
}
}
} // namespace mongo