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// wiredtiger_kv_engine.h
/**
* 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.
*/
#pragma once
#include <list>
#include <memory>
#include <string>
#include <wiredtiger.h>
#include "mongo/bson/ordering.h"
#include "mongo/db/storage/kv/kv_engine.h"
#include "mongo/db/storage/wiredtiger/wiredtiger_session_cache.h"
#include "mongo/stdx/functional.h"
#include "mongo/stdx/mutex.h"
#include "mongo/util/elapsed_tracker.h"
namespace mongo {
class ClockSource;
class JournalListener;
class WiredTigerSessionCache;
class WiredTigerSizeStorer;
class WiredTigerKVEngine final : public KVEngine {
public:
WiredTigerKVEngine(const std::string& canonicalName,
const std::string& path,
ClockSource* cs,
const std::string& extraOpenOptions,
size_t cacheSizeGB,
bool durable,
bool ephemeral,
bool repair,
bool readOnly);
virtual ~WiredTigerKVEngine();
void setRecordStoreExtraOptions(const std::string& options);
void setSortedDataInterfaceExtraOptions(const std::string& options);
virtual bool supportsDocLocking() const;
virtual bool supportsDirectoryPerDB() const;
virtual bool isDurable() const {
return _durable;
}
virtual bool isEphemeral() const {
return _ephemeral;
}
virtual RecoveryUnit* newRecoveryUnit();
virtual Status createRecordStore(OperationContext* opCtx,
StringData ns,
StringData ident,
const CollectionOptions& options) {
return createGroupedRecordStore(opCtx, ns, ident, options, KVPrefix::kNotPrefixed);
}
virtual std::unique_ptr<RecordStore> getRecordStore(OperationContext* opCtx,
StringData ns,
StringData ident,
const CollectionOptions& options) {
return getGroupedRecordStore(opCtx, ns, ident, options, KVPrefix::kNotPrefixed);
}
virtual Status createSortedDataInterface(OperationContext* opCtx,
StringData ident,
const IndexDescriptor* desc) {
return createGroupedSortedDataInterface(opCtx, ident, desc, KVPrefix::kNotPrefixed);
}
virtual SortedDataInterface* getSortedDataInterface(OperationContext* opCtx,
StringData ident,
const IndexDescriptor* desc) {
return getGroupedSortedDataInterface(opCtx, ident, desc, KVPrefix::kNotPrefixed);
}
virtual Status createGroupedRecordStore(OperationContext* opCtx,
StringData ns,
StringData ident,
const CollectionOptions& options,
KVPrefix prefix);
virtual std::unique_ptr<RecordStore> getGroupedRecordStore(OperationContext* opCtx,
StringData ns,
StringData ident,
const CollectionOptions& options,
KVPrefix prefix);
virtual Status createGroupedSortedDataInterface(OperationContext* opCtx,
StringData ident,
const IndexDescriptor* desc,
KVPrefix prefix);
virtual SortedDataInterface* getGroupedSortedDataInterface(OperationContext* opCtx,
StringData ident,
const IndexDescriptor* desc,
KVPrefix prefix);
virtual Status dropIdent(OperationContext* opCtx, StringData ident);
virtual Status okToRename(OperationContext* opCtx,
StringData fromNS,
StringData toNS,
StringData ident,
const RecordStore* originalRecordStore) const;
virtual int flushAllFiles(OperationContext* opCtx, bool sync);
virtual Status beginBackup(OperationContext* opCtx);
virtual void endBackup(OperationContext* opCtx);
virtual int64_t getIdentSize(OperationContext* opCtx, StringData ident);
virtual Status repairIdent(OperationContext* opCtx, StringData ident);
virtual bool hasIdent(OperationContext* opCtx, StringData ident) const;
std::vector<std::string> getAllIdents(OperationContext* opCtx) const;
virtual void cleanShutdown();
SnapshotManager* getSnapshotManager() const final {
return &_sessionCache->snapshotManager();
}
void setJournalListener(JournalListener* jl) final;
virtual void setStableTimestamp(SnapshotName stableTimestamp) override;
virtual void setInitialDataTimestamp(SnapshotName initialDataTimestamp) override;
virtual bool supportsRecoverToStableTimestamp() const override;
// wiredtiger specific
// Calls WT_CONNECTION::reconfigure on the underlying WT_CONNECTION
// held by this class
int reconfigure(const char* str);
WT_CONNECTION* getConnection() {
return _conn;
}
void dropSomeQueuedIdents();
std::list<WiredTigerCachedCursor> filterCursorsWithQueuedDrops(
std::list<WiredTigerCachedCursor>* cache);
bool haveDropsQueued() const;
void syncSizeInfo(bool sync) const;
/**
* Sets the implementation for `initRsOplogBackgroundThread` (allowing tests to skip the
* background job, for example). Intended to be called from a MONGO_INITIALIZER and therefroe in
* a single threaded context.
*/
static void setInitRsOplogBackgroundThreadCallback(stdx::function<bool(StringData)> cb);
/**
* Initializes a background job to remove excess documents in the oplog collections.
* This applies to the capped collections in the local.oplog.* namespaces (specifically
* local.oplog.rs for replica sets and local.oplog.$main for master/slave replication).
* Returns true if a background job is running for the namespace.
*/
static bool initRsOplogBackgroundThread(StringData ns);
static void appendGlobalStats(BSONObjBuilder& b);
private:
class WiredTigerJournalFlusher;
class WiredTigerCheckpointThread;
Status _salvageIfNeeded(const char* uri);
void _checkIdentPath(StringData ident);
bool _hasUri(WT_SESSION* session, const std::string& uri) const;
std::string _uri(StringData ident) const;
bool _drop(StringData ident);
WT_CONNECTION* _conn;
WT_EVENT_HANDLER _eventHandler;
std::unique_ptr<WiredTigerSessionCache> _sessionCache;
std::string _canonicalName;
std::string _path;
std::string _wtOpenConfig;
std::unique_ptr<WiredTigerSizeStorer> _sizeStorer;
std::string _sizeStorerUri;
mutable ElapsedTracker _sizeStorerSyncTracker;
bool _durable;
bool _ephemeral;
bool _readOnly;
std::unique_ptr<WiredTigerJournalFlusher> _journalFlusher; // Depends on _sizeStorer
std::unique_ptr<WiredTigerCheckpointThread> _checkpointThread;
std::string _rsOptions;
std::string _indexOptions;
mutable stdx::mutex _dropAllQueuesMutex;
mutable stdx::mutex _identToDropMutex;
std::list<std::string> _identToDrop;
mutable Date_t _previousCheckedDropsQueued;
std::unique_ptr<WiredTigerSession> _backupSession;
};
}
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