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/**
* Copyright (C) 2021-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/client/replica_set_monitor.h"
#include "mongo/client/sdam/sdam_datatypes.h"
#include "mongo/db/repl/primary_only_service.h"
#include "mongo/db/serverless/shard_split_state_machine_gen.h"
#include "mongo/executor/cancelable_executor.h"
namespace mongo {
using ScopedTaskExecutorPtr = std::shared_ptr<executor::ScopedTaskExecutor>;
namespace detail {
std::function<bool(const std::vector<sdam::ServerDescriptionPtr>&)>
makeRecipientAcceptSplitPredicate(const ConnectionString& recipientConnectionString);
SemiFuture<void> makeRecipientAcceptSplitFuture(ExecutorPtr executor,
const CancellationToken& token,
const StringData& recipientTagName,
const StringData& recipientSetName);
}; // namespace detail
class ShardSplitDonorService final : public repl::PrimaryOnlyService {
public:
static constexpr StringData kServiceName = "ShardSplitDonorService"_sd;
explicit ShardSplitDonorService(ServiceContext* const serviceContext)
: PrimaryOnlyService(serviceContext), _serviceContext(serviceContext) {}
~ShardSplitDonorService() = default;
class DonorStateMachine;
StringData getServiceName() const override {
return kServiceName;
}
NamespaceString getStateDocumentsNS() const override {
return NamespaceString::kTenantSplitDonorsNamespace;
}
ThreadPool::Limits getThreadPoolLimits() const override;
protected:
// Instance conflict check not yet implemented.
void checkIfConflictsWithOtherInstances(
OperationContext* opCtx,
BSONObj initialState,
const std::vector<const repl::PrimaryOnlyService::Instance*>& existingInstances) override{};
std::shared_ptr<PrimaryOnlyService::Instance> constructInstance(BSONObj initialState) override;
private:
ServiceContext* const _serviceContext;
};
class ShardSplitDonorService::DonorStateMachine final
: public repl::PrimaryOnlyService::TypedInstance<DonorStateMachine> {
public:
struct DurableState {
ShardSplitDonorStateEnum state;
boost::optional<Status> abortReason;
};
DonorStateMachine(ServiceContext* serviceContext,
ShardSplitDonorService* serviceInstance,
const ShardSplitDonorDocument& initialState);
~DonorStateMachine() = default;
/**
* Try to abort this split operation. If the split operation is uninitialized, this will
* durably record the operation as aborted.
*/
void tryAbort();
Status checkIfOptionsConflict(const ShardSplitDonorDocument& stateDoc) const;
SemiFuture<void> run(std::shared_ptr<executor::ScopedTaskExecutor> executor,
const CancellationToken& token) noexcept override;
void interrupt(Status status) override;
SharedSemiFuture<DurableState> completionFuture() const {
return _completionPromise.getFuture();
}
SharedSemiFuture<void> replicaSetMonitorCreatedFuture() const {
return _replicaSetMonitorCreatedPromise.getFuture();
}
UUID getId() const {
return _migrationId;
}
/**
* Report TenantMigrationDonorService Instances in currentOp().
*/
boost::optional<BSONObj> reportForCurrentOp(
MongoProcessInterface::CurrentOpConnectionsMode connMode,
MongoProcessInterface::CurrentOpSessionsMode sessionMode) noexcept override;
private:
// Tasks
ExecutorFuture<void> _enterDataSyncState(const ScopedTaskExecutorPtr& executor,
const CancellationToken& token);
ExecutorFuture<void> _enterBlockingState(const ScopedTaskExecutorPtr& executor,
const CancellationToken& token);
ExecutorFuture<void> _waitForRecipientToAcceptSplit(const ScopedTaskExecutorPtr& executor,
const CancellationToken& token);
// Helpers
ExecutorFuture<void> _writeInitialDocument(const ScopedTaskExecutorPtr& executor,
const CancellationToken& token);
ExecutorFuture<repl::OpTime> _updateStateDocument(const ScopedTaskExecutorPtr& executor,
const CancellationToken& token,
ShardSplitDonorStateEnum nextState);
ExecutorFuture<void> _waitForMajorityWriteConcern(const ScopedTaskExecutorPtr& executor,
repl::OpTime opTime,
const CancellationToken& token);
void _initiateTimeout(const ScopedTaskExecutorPtr& executor,
const CancellationToken& abortToken);
void _createReplicaSetMonitor(const ExecutorPtr& executor, const CancellationToken& abortToken);
ExecutorFuture<DurableState> _handleErrorOrEnterAbortedState(
StatusWith<DurableState> durableState,
const ScopedTaskExecutorPtr& executor,
const CancellationToken& instanceAbortToken,
const CancellationToken& abortToken);
private:
const NamespaceString _stateDocumentsNS = NamespaceString::kTenantSplitDonorsNamespace;
mutable Mutex _mutex = MONGO_MAKE_LATCH("ShardSplitDonorService::_mutex");
const UUID _migrationId;
ServiceContext* const _serviceContext;
ShardSplitDonorService* const _shardSplitService;
ShardSplitDonorDocument _stateDoc;
bool _abortRequested = false;
boost::optional<CancellationSource> _abortSource;
boost::optional<Status> _abortReason;
// A promise fulfilled when the replicaSetMonitor has been created;
SharedPromise<void> _replicaSetMonitorCreatedPromise;
// A promise fulfilled when the shard split operation has fully completed
SharedPromise<DurableState> _completionPromise;
// A promise fulfilled when all recipient nodes have accepted the split.
SharedPromise<void> _recipientAcceptedSplit;
};
} // namespace mongo
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