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arangodb/arangod/RocksDBEngine/RocksDBEngine.h

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////////////////////////////////////////////////////////////////////////////////
/// DISCLAIMER
///
/// Copyright 2014-2016 ArangoDB GmbH, Cologne, Germany
/// Copyright 2004-2014 triAGENS 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
/// @author Jan Christoph Uhde
////////////////////////////////////////////////////////////////////////////////
#ifndef ARANGOD_ROCKSDB_ENGINE_ROCKSDB_ENGINE_H
#define ARANGOD_ROCKSDB_ENGINE_ROCKSDB_ENGINE_H 1
#include "Basics/Common.h"
#include "Basics/Mutex.h"
#include "RocksDBEngine/RocksDBTypes.h"
#include "StorageEngine/StorageEngine.h"
#include "VocBase/AccessMode.h"
#include <rocksdb/db.h>
#include <rocksdb/utilities/transaction_db.h>
#include <velocypack/Builder.h>
#include <velocypack/Slice.h>
namespace arangodb {
class PhysicalCollection;
class PhysicalView;
class RocksDBBackgroundThread;
class RocksDBComparator;
class RocksDBCounterManager;
class RocksDBReplicationManager;
class RocksDBLogValue;
class TransactionCollection;
class TransactionState;
namespace rest {
class RestHandlerFactory;
}
namespace transaction {
class ContextData;
}
class RocksDBEngine final : public StorageEngine {
public:
// create the storage engine
explicit RocksDBEngine(application_features::ApplicationServer*);
~RocksDBEngine();
// inherited from ApplicationFeature
// ---------------------------------
// add the storage engine's specifc options to the global list of options
void collectOptions(std::shared_ptr<options::ProgramOptions>) override;
// validate the storage engine's specific options
void validateOptions(std::shared_ptr<options::ProgramOptions>) override;
void start() override;
void stop() override;
// preparation phase for storage engine. can be used for internal setup.
// the storage engine must not start any threads here or write any files
void prepare() override;
void unprepare() override;
transaction::ContextData* createTransactionContextData() override;
TransactionState* createTransactionState(TRI_vocbase_t*) override;
TransactionCollection* createTransactionCollection(
TransactionState* state, TRI_voc_cid_t cid, AccessMode::Type accessType,
int nestingLevel) override;
// create storage-engine specific collection
PhysicalCollection* createPhysicalCollection(LogicalCollection*,
VPackSlice const&) override;
// create storage-engine specific view
PhysicalView* createPhysicalView(LogicalView*, VPackSlice const&) override;
// inventory functionality
// -----------------------
void getDatabases(arangodb::velocypack::Builder& result) override;
void getCollectionInfo(TRI_vocbase_t* vocbase, TRI_voc_cid_t cid,
arangodb::velocypack::Builder& result,
bool includeIndexes, TRI_voc_tick_t maxTick) override;
int getCollectionsAndIndexes(TRI_vocbase_t* vocbase,
arangodb::velocypack::Builder& result,
bool wasCleanShutdown, bool isUpgrade) override;
int getViews(TRI_vocbase_t* vocbase,
arangodb::velocypack::Builder& result) override;
std::string versionFilename(TRI_voc_tick_t id) const override;
std::string databasePath(TRI_vocbase_t const* vocbase) const override;
std::string collectionPath(TRI_vocbase_t const* vocbase,
TRI_voc_cid_t id) const override;
std::shared_ptr<arangodb::velocypack::Builder>
getReplicationApplierConfiguration(TRI_vocbase_t* vocbase,
int& status) override;
int removeReplicationApplierConfiguration(TRI_vocbase_t* vocbase) override;
int saveReplicationApplierConfiguration(TRI_vocbase_t* vocbase,
arangodb::velocypack::Slice slice,
bool doSync) override;
// database, collection and index management
// -----------------------------------------
void waitForSync(TRI_voc_tick_t tick) override;
virtual TRI_vocbase_t* openDatabase(
arangodb::velocypack::Slice const& parameters, bool isUpgrade,
int&) override;
TRI_vocbase_t* createDatabase(TRI_voc_tick_t id,
arangodb::velocypack::Slice const& args,
int& status) override;
int writeCreateDatabaseMarker(TRI_voc_tick_t id,
VPackSlice const& slice) override;
void prepareDropDatabase(TRI_vocbase_t* vocbase, bool useWriteMarker,
int& status) override;
Result dropDatabase(TRI_vocbase_t* database) override;
void waitUntilDeletion(TRI_voc_tick_t id, bool force, int& status) override;
// wal in recovery
bool inRecovery() override;
// start compactor thread and delete files form collections marked as deleted
void recoveryDone(TRI_vocbase_t* vocbase) override;
public:
std::string createCollection(TRI_vocbase_t* vocbase, TRI_voc_cid_t id,
arangodb::LogicalCollection const*) override;
arangodb::Result persistCollection(
TRI_vocbase_t* vocbase, arangodb::LogicalCollection const*) override;
arangodb::Result dropCollection(TRI_vocbase_t* vocbase,
arangodb::LogicalCollection*) override;
void destroyCollection(TRI_vocbase_t* vocbase,
arangodb::LogicalCollection*) override;
void changeCollection(TRI_vocbase_t* vocbase, TRI_voc_cid_t id,
arangodb::LogicalCollection const*,
bool doSync) override;
arangodb::Result renameCollection(TRI_vocbase_t* vocbase,
arangodb::LogicalCollection const*,
std::string const& oldName) override;
void createIndex(TRI_vocbase_t* vocbase, TRI_voc_cid_t collectionId,
TRI_idx_iid_t id,
arangodb::velocypack::Slice const& data) override;
void dropIndex(TRI_vocbase_t* vocbase, TRI_voc_cid_t collectionId,
TRI_idx_iid_t id) override;
void dropIndexWalMarker(TRI_vocbase_t* vocbase, TRI_voc_cid_t collectionId,
arangodb::velocypack::Slice const& data,
bool writeMarker, int&) override;
void unloadCollection(TRI_vocbase_t* vocbase,
arangodb::LogicalCollection* collection) override;
void createView(TRI_vocbase_t* vocbase, TRI_voc_cid_t id,
arangodb::LogicalView const*) override;
arangodb::Result persistView(TRI_vocbase_t* vocbase,
arangodb::LogicalView const*) override;
arangodb::Result dropView(TRI_vocbase_t* vocbase,
arangodb::LogicalView*) override;
void destroyView(TRI_vocbase_t* vocbase, arangodb::LogicalView*) override;
void changeView(TRI_vocbase_t* vocbase, TRI_voc_cid_t id,
arangodb::LogicalView const*, bool doSync) override;
void signalCleanup(TRI_vocbase_t* vocbase) override;
// document operations
// -------------------
void iterateDocuments(
TRI_voc_tick_t databaseId, TRI_voc_cid_t collectionId,
std::function<void(arangodb::velocypack::Slice const&)> const& cb)
override;
void addDocumentRevision(
TRI_voc_tick_t databaseId, TRI_voc_cid_t collectionId,
arangodb::velocypack::Slice const& document) override;
void removeDocumentRevision(
TRI_voc_tick_t databaseId, TRI_voc_cid_t collectionId,
arangodb::velocypack::Slice const& document) override;
/// @brief remove data of expired compaction blockers
bool cleanupCompactionBlockers(TRI_vocbase_t* vocbase) override;
/// @brief insert a compaction blocker
int insertCompactionBlocker(TRI_vocbase_t* vocbase, double ttl,
TRI_voc_tick_t& id) override;
/// @brief touch an existing compaction blocker
int extendCompactionBlocker(TRI_vocbase_t* vocbase, TRI_voc_tick_t id,
double ttl) override;
/// @brief remove an existing compaction blocker
int removeCompactionBlocker(TRI_vocbase_t* vocbase,
TRI_voc_tick_t id) override;
/// @brief a callback function that is run while it is guaranteed that there
/// is no compaction ongoing
void preventCompaction(
TRI_vocbase_t* vocbase,
std::function<void(TRI_vocbase_t*)> const& callback) override;
/// @brief a callback function that is run there is no compaction ongoing
bool tryPreventCompaction(TRI_vocbase_t* vocbase,
std::function<void(TRI_vocbase_t*)> const& callback,
bool checkForActiveBlockers) override;
int shutdownDatabase(TRI_vocbase_t* vocbase) override;
int openCollection(TRI_vocbase_t* vocbase, LogicalCollection* collection,
bool ignoreErrors) override;
/// @brief Add engine-specific AQL functions.
void addAqlFunctions() override;
/// @brief Add engine-specific optimizer rules
void addOptimizerRules() override;
/// @brief Add engine-specific V8 functions
void addV8Functions() override;
/// @brief Add engine-specific REST handlers
void addRestHandlers(rest::RestHandlerFactory*) override;
void addParametersForNewCollection(arangodb::velocypack::Builder& builder,
arangodb::velocypack::Slice info) override;
void addParametersForNewIndex(arangodb::velocypack::Builder& builder,
arangodb::velocypack::Slice info) override;
rocksdb::TransactionDB* db() const { return _db; }
RocksDBComparator* cmp() const { return _cmp.get(); }
int writeCreateCollectionMarker(TRI_voc_tick_t databaseId, TRI_voc_cid_t id,
VPackSlice const& slice, RocksDBLogValue&& logValue);
void addCollectionMapping(uint64_t, TRI_voc_tick_t, TRI_voc_cid_t);
std::pair<TRI_voc_tick_t, TRI_voc_cid_t> mapObjectToCollection(uint64_t);
Result createLoggerState(TRI_vocbase_t* vocbase, VPackBuilder& builder);
private:
Result dropDatabase(TRI_voc_tick_t);
bool systemDatabaseExists();
void addSystemDatabase();
/// @brief open an existing database. internal function
TRI_vocbase_t* openExistingDatabase(TRI_voc_tick_t id,
std::string const& name,
bool wasCleanShutdown, bool isUpgrade);
public:
static std::string const EngineName;
static std::string const FeatureName;
RocksDBCounterManager* counterManager() const;
RocksDBReplicationManager* replicationManager() const;
private:
/// single rocksdb database used in this storage engine
rocksdb::TransactionDB* _db;
/// default read options
rocksdb::Options _options;
/// arangodb comparator - requried because of vpack in keys
std::unique_ptr<RocksDBComparator> _cmp;
/// path used by rocksdb (inside _basePath)
std::string _path;
/// path to arangodb data dir
std::string _basePath;
/// repository for replication contexts
std::unique_ptr<RocksDBReplicationManager> _replicationManager;
/// tracks the count of documents in collections
std::unique_ptr<RocksDBCounterManager> _counterManager;
/// Background thread handling garbage collection etc
std::unique_ptr<RocksDBBackgroundThread> _backgroundThread;
uint64_t _maxTransactionSize; // maximum allowed size for a transaction
uint64_t _intermediateTransactionCommitSize; // maximum size for a
// transaction before a
// intermediate commit will be
// tried
uint64_t _intermediateTransactionCommitCount; // limit of transaction count
// for intermediate commit
bool _intermediateTransactionCommitEnabled; // allow usage of intermediate
// commits
std::unordered_map<uint64_t, std::pair<TRI_voc_tick_t, TRI_voc_cid_t>>
_collectionMap;
};
}
#endif
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