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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/db/s/balancer/balancer_defragmentation_policy.h"
#include "mongo/db/s/balancer/balancer_policy.h"
#include "mongo/db/s/balancer/balancer_random.h"
#include "mongo/s/catalog/type_collection.h"
namespace mongo {
/**
* Interface describing the interactions that the defragmentation policy can establish with the
* phase of the algorithm that is currently active on a collection.
* With the exception getType(), its methods do not guarantee thread safety.
*/
class DefragmentationPhase {
public:
virtual ~DefragmentationPhase() {}
virtual DefragmentationPhaseEnum getType() const = 0;
virtual DefragmentationPhaseEnum getNextPhase() const = 0;
virtual boost::optional<DefragmentationAction> popNextStreamableAction(
OperationContext* opCtx) = 0;
virtual boost::optional<MigrateInfo> popNextMigration(
OperationContext* opCtx, stdx::unordered_set<ShardId>* usedShards) = 0;
virtual void applyActionResult(OperationContext* opCtx,
const DefragmentationAction& action,
const DefragmentationActionResponse& response) = 0;
virtual BSONObj reportProgress() const = 0;
virtual bool isComplete() const = 0;
virtual void userAbort() = 0;
};
class BalancerDefragmentationPolicyImpl : public BalancerDefragmentationPolicy {
BalancerDefragmentationPolicyImpl(const BalancerDefragmentationPolicyImpl&) = delete;
BalancerDefragmentationPolicyImpl& operator=(const BalancerDefragmentationPolicyImpl&) = delete;
public:
BalancerDefragmentationPolicyImpl(ClusterStatistics* clusterStats,
BalancerRandomSource& random,
const std::function<void()>& onStateUpdated)
: _clusterStats(clusterStats), _random(random), _onStateUpdated(onStateUpdated) {}
~BalancerDefragmentationPolicyImpl() {}
void interruptAllDefragmentations() override;
bool isDefragmentingCollection(const UUID& uuid) override;
virtual BSONObj reportProgressOn(const UUID& uuid) override;
MigrateInfoVector selectChunksToMove(OperationContext* opCtx,
stdx::unordered_set<ShardId>* usedShards) override;
StringData getName() const override;
boost::optional<DefragmentationAction> getNextStreamingAction(OperationContext* opCtx) override;
void applyActionResult(OperationContext* opCtx,
const DefragmentationAction& action,
const DefragmentationActionResponse& response) override;
void startCollectionDefragmentation(OperationContext* opCtx,
const CollectionType& coll) override;
void abortCollectionDefragmentation(OperationContext* opCtx,
const NamespaceString& nss) override;
private:
/**
* Advances the defragmentation state of the specified collection to the next actionable phase
* (or sets the related DefragmentationPhase object to nullptr if nothing more can be done).
*/
bool _advanceToNextActionablePhase(OperationContext* opCtx, const UUID& collUuid);
/**
* Move to the next phase and persist the phase change. This will end defragmentation if the
* next phase is kFinished.
* Must be called while holding the _stateMutex.
*/
std::unique_ptr<DefragmentationPhase> _transitionPhases(OperationContext* opCtx,
const CollectionType& coll,
DefragmentationPhaseEnum nextPhase,
bool shouldPersistPhase = true);
/**
* Builds the defragmentation phase object matching the current state of the passed
* collection and sets it into _defragmentationStates.
*/
void _initializeCollectionState(WithLock, OperationContext* opCtx, const CollectionType& coll);
/**
* Write the new phase to the defragmentationPhase field in config.collections. If phase is
* kFinished, the field will be removed.
* Must be called while holding the _stateMutex.
*/
void _persistPhaseUpdate(OperationContext* opCtx,
DefragmentationPhaseEnum phase,
const UUID& uuid);
/**
* Remove all datasize fields from config.chunks for the given namespace.
* Must be called while holding the _stateMutex.
*/
void _clearDefragmentationState(OperationContext* opCtx, const UUID& uuid);
const std::string kPolicyName{"BalancerDefragmentationPolicy"};
Mutex _stateMutex = MONGO_MAKE_LATCH("BalancerChunkMergerImpl::_stateMutex");
ClusterStatistics* const _clusterStats;
BalancerRandomSource& _random;
const std::function<void()> _onStateUpdated;
stdx::unordered_map<UUID, std::unique_ptr<DefragmentationPhase>, UUID::Hash>
_defragmentationStates;
};
} // namespace mongo
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