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/**
* Copyright (C) 2020-present MongoDB, Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the Server Side Public License, version 1,
* as published by MongoDB, Inc.
*
* 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
* Server Side Public License for more details.
*
* You should have received a copy of the Server Side Public License
* along with this program. If not, see
* <http://www.mongodb.com/licensing/server-side-public-license>.
*
* 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 Server Side 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/db/operation_context.h"
#include "mongo/db/s/config/initial_split_policy.h"
#include "mongo/db/s/create_collection_coordinator_document_gen.h"
#include "mongo/db/s/shard_filtering_metadata_refresh.h"
#include "mongo/db/s/sharding_ddl_coordinator.h"
#include "mongo/s/request_types/sharded_ddl_commands_gen.h"
#include "mongo/util/future.h"
namespace mongo {
class CreateCollectionCoordinator
: public RecoverableShardingDDLCoordinator<CreateCollectionCoordinatorDocument,
CreateCollectionCoordinatorPhaseEnum> {
public:
using CoordDoc = CreateCollectionCoordinatorDocument;
using Phase = CreateCollectionCoordinatorPhaseEnum;
CreateCollectionCoordinator(ShardingDDLCoordinatorService* service, const BSONObj& initialState)
: RecoverableShardingDDLCoordinator(service, "CreateCollectionCoordinator", initialState),
_request(_doc.getCreateCollectionRequest()),
_critSecReason(BSON("command"
<< "createCollection"
<< "ns" << originalNss().toString())) {}
~CreateCollectionCoordinator() = default;
void checkIfOptionsConflict(const BSONObj& coorDoc) const override;
void appendCommandInfo(BSONObjBuilder* cmdInfoBuilder) const override;
/**
* Waits for the termination of the parent DDLCoordinator (so all the resources are liberated)
* and then return the
*/
CreateCollectionResponse getResult(OperationContext* opCtx) {
getCompletionFuture().get(opCtx);
invariant(_result.is_initialized());
return *_result;
}
protected:
const NamespaceString& nss() const override;
private:
StringData serializePhase(const Phase& phase) const override {
return CreateCollectionCoordinatorPhase_serializer(phase);
}
ExecutorFuture<void> _runImpl(std::shared_ptr<executor::ScopedTaskExecutor> executor,
const CancellationToken& token) noexcept override;
/**
* Performs all required checks before holding the critical sections.
*/
void _checkCommandArguments(OperationContext* opCtx);
boost::optional<CreateCollectionResponse> _checkIfCollectionAlreadyShardedWithSameOptions(
OperationContext* opCtx);
TranslatedRequestParams _translateRequestParameters(OperationContext* opCtx);
// TODO SERVER-68008 Remove once 7.0 becomes last LTS; when the function appears in if clauses,
// modify the code assuming that a "false" value gets returned
bool _timeseriesNssResolvedByCommandHandler() const;
void _acquireCriticalSections(OperationContext* opCtx);
void _promoteCriticalSectionsToBlockReads(OperationContext* opCtx) const;
void _releaseCriticalSections(OperationContext* opCtx);
/**
* Ensures the collection is created locally and has the appropiate shard index.
*/
void _createCollectionAndIndexes(OperationContext* opCtx,
const ShardKeyPattern& shardKeyPattern);
/**
* Creates the appropiate split policy.
*/
void _createPolicy(OperationContext* opCtx, const ShardKeyPattern& shardKeyPattern);
/**
* Given the appropiate split policy, create the initial chunks.
*/
void _createChunks(OperationContext* opCtx, const ShardKeyPattern& shardKeyPattern);
/**
* If the optimized path can be taken, ensure the collection is already created in all the
* participant shards.
*/
void _createCollectionOnNonPrimaryShards(OperationContext* opCtx,
const OperationSessionInfo& osi);
/**
* Does the following writes:
* 1. Updates the config.collections entry for the new sharded collection
* 2. Updates config.chunks entries for the new sharded collection
* 3. Inserts an entry into config.placementHistory with the sublist of shards that will host
* one or more chunks of the new collections at creation time
*/
void _commit(OperationContext* opCtx, const std::shared_ptr<executor::TaskExecutor>& executor);
/**
* Helper function to audit and log the shard collection event.
*/
void _logStartCreateCollection(OperationContext* opCtx);
/**
* Helper function to log the end of the shard collection event.
*/
void _logEndCreateCollection(OperationContext* opCtx);
mongo::CreateCollectionRequest _request;
const BSONObj _critSecReason;
// Set on successful completion of the coordinator
boost::optional<CreateCollectionResponse> _result;
// The fields below are only populated if the coordinator enters in the branch where the
// collection is not already sharded (i.e., they will not be present on early return)
boost::optional<UUID> _collectionUUID;
std::unique_ptr<InitialSplitPolicy> _splitPolicy;
boost::optional<InitialSplitPolicy::ShardCollectionConfig> _initialChunks;
boost::optional<bool> _collectionEmpty;
};
} // namespace mongo
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