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/**
* Copyright (C) 2015 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 "mongo/client/connection_string.h"
#include "mongo/platform/atomic_word.h"
#include "mongo/s/catalog/catalog_manager.h"
#include "mongo/stdx/condition_variable.h"
#include "mongo/stdx/mutex.h"
#include "mongo/stdx/thread.h"
namespace mongo {
/**
* Implements the catalog manager using the legacy 3-config server protocol.
*/
class CatalogManagerLegacy final : public CatalogManager {
public:
CatalogManagerLegacy();
~CatalogManagerLegacy();
/**
* Initializes the catalog manager with the hosts, which will be used as a configuration
* server. Can only be called once for the lifetime.
*/
Status init(const ConnectionString& configCS);
Status startup() override;
ConnectionString connectionString() const override;
void shutDown() override;
Status shardCollection(OperationContext* txn,
const std::string& ns,
const ShardKeyPattern& fieldsAndOrder,
bool unique,
const std::vector<BSONObj>& initPoints,
const std::set<ShardId>& initShardIds) override;
StatusWith<ShardDrainingStatus> removeShard(OperationContext* txn,
const std::string& name) override;
StatusWith<DatabaseType> getDatabase(const std::string& dbName) override;
StatusWith<CollectionType> getCollection(const std::string& collNs) override;
Status getCollections(const std::string* dbName, std::vector<CollectionType>* collections);
Status getDatabasesForShard(const std::string& shardName,
std::vector<std::string>* dbs) override;
Status getChunks(const BSONObj& query,
const BSONObj& sort,
boost::optional<int> limit,
std::vector<ChunkType>* chunks) override;
Status getTagsForCollection(const std::string& collectionNs,
std::vector<TagsType>* tags) override;
StatusWith<std::string> getTagForChunk(const std::string& collectionNs,
const ChunkType& chunk) override;
Status getAllShards(std::vector<ShardType>* shards) override;
/**
* Grabs a distributed lock and runs the command on all config servers.
*/
bool runUserManagementWriteCommand(const std::string& commandName,
const std::string& dbname,
const BSONObj& cmdObj,
BSONObjBuilder* result) override;
bool runReadCommand(const std::string& dbname,
const BSONObj& cmdObj,
BSONObjBuilder* result) override;
Status applyChunkOpsDeprecated(const BSONArray& updateOps,
const BSONArray& preCondition) override;
void logAction(const ActionLogType& actionLog);
void logChange(const std::string& clientAddress,
const std::string& what,
const std::string& ns,
const BSONObj& detail) override;
StatusWith<SettingsType> getGlobalSettings(const std::string& key) override;
void writeConfigServerDirect(const BatchedCommandRequest& request,
BatchedCommandResponse* response) override;
DistLockManager* getDistLockManager() const override;
Status checkAndUpgrade(bool checkOnly) override;
private:
Status _checkDbDoesNotExist(const std::string& dbName, DatabaseType* db) const override;
StatusWith<std::string> _generateNewShardName() const override;
/**
* Starts the thread that periodically checks data consistency amongst the config servers.
* Note: this is not thread safe and can only be called once for the lifetime.
*/
Status _startConfigServerChecker();
/**
* Returns the number of shards recognized by the config servers
* in this sharded cluster.
* Optional: use query parameter to filter shard count.
*/
size_t _getShardCount(const BSONObj& query) const;
/**
* Returns true if all config servers have the same state.
* If inconsistency detected on first attempt, checks at most 3 more times.
*/
bool _checkConfigServersConsistent(const unsigned tries = 4) const;
/**
* Checks data consistency amongst config servers every 60 seconds.
*/
void _consistencyChecker();
/**
* Returns true if the config servers have the same contents since the last
* check was performed.
*/
bool _isConsistentFromLastCheck();
// Parsed config server hosts, as specified on the command line.
ConnectionString _configServerConnectionString;
std::vector<ConnectionString> _configServers;
// Distribted lock manager singleton.
std::unique_ptr<DistLockManager> _distLockManager;
// Whether the logChange call should attempt to create the changelog collection
AtomicInt32 _changeLogCollectionCreated;
// Whether the logAction call should attempt to create the actionlog collection
AtomicInt32 _actionLogCollectionCreated;
// protects _inShutdown, _consistentFromLastCheck; used by _consistencyCheckerCV
stdx::mutex _mutex;
// True if CatalogManagerLegacy::shutDown has been called. False, otherwise.
bool _inShutdown = false;
// used by consistency checker thread to check if config
// servers are consistent
bool _consistentFromLastCheck = false;
// Thread that runs dbHash on config servers for checking data consistency.
stdx::thread _consistencyCheckerThread;
// condition variable used by the consistency checker thread to wait
// for <= 60s, on every iteration, until shutDown is called
stdx::condition_variable _consistencyCheckerCV;
};
} // namespace mongo
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