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/**
* Copyright (C) 2019-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 <memory>
#include <vector>
#include "mongo/db/repl/base_cloner.h"
#include "mongo/db/repl/task_runner.h"
#include "mongo/util/progress_meter.h"
namespace mongo {
namespace repl {
namespace {
const int kProgressMeterSecondsBetween = 60;
const int kProgressMeterCheckInterval = 128;
} // namespace
class CollectionCloner final : public BaseCloner {
public:
struct Stats {
static constexpr StringData kDocumentsToCopyFieldName = "documentsToCopy"_sd;
static constexpr StringData kDocumentsCopiedFieldName = "documentsCopied"_sd;
std::string ns;
Date_t start;
Date_t end;
size_t documentToCopy{0};
size_t documentsCopied{0};
size_t indexes{0};
size_t fetchedBatches{0}; // This is actually inserted batches.
size_t receivedBatches{0};
std::string toString() const;
BSONObj toBSON() const;
void append(BSONObjBuilder* builder) const;
};
/**
* Type of function to schedule storage interface tasks with the executor.
*
* Used for testing only.
*/
using ScheduleDbWorkFn = unique_function<StatusWith<executor::TaskExecutor::CallbackHandle>(
executor::TaskExecutor::CallbackFn)>;
CollectionCloner(const NamespaceString& ns,
const CollectionOptions& collectionOptions,
InitialSyncSharedData* sharedData,
const HostAndPort& source,
DBClientConnection* client,
StorageInterface* storageInterface,
ThreadPool* dbPool,
ClockSource* clock = SystemClockSource::get());
virtual ~CollectionCloner() = default;
Stats getStats() const;
std::string toString() const;
NamespaceString getSourceNss() const {
return _sourceNss;
}
UUID getSourceUuid() const {
return *_sourceDbAndUuid.uuid();
}
/**
* Set the cloner batch size.
*
* Used for testing only. Set by server parameter 'collectionClonerBatchSize' in normal
* operation.
*/
void setBatchSize_forTest(int batchSize) {
_collectionClonerBatchSize = batchSize;
}
protected:
ClonerStages getStages() final;
bool isMyFailPoint(const BSONObj& data) const final;
private:
friend class CollectionClonerTest;
class CollectionClonerStage : public ClonerStage<CollectionCloner> {
public:
CollectionClonerStage(std::string name, CollectionCloner* cloner, ClonerRunFn stageFunc)
: ClonerStage<CollectionCloner>(name, cloner, stageFunc) {}
AfterStageBehavior run() override;
};
std::string describeForFuzzer(BaseClonerStage* stage) const final {
return _sourceNss.db() + " db: { " + stage->getName() + ": UUID(\"" +
_sourceDbAndUuid.uuid()->toString() + "\") coll: " + _sourceNss.coll() + " }";
}
/**
* The preStage sets the start time in _stats.
*/
void preStage() final;
/**
* The postStage sets the end time in _stats.
*/
void postStage() final;
/**
* Stage function that counts the number of documents in the collection on the source in order
* to generate progress information.
*/
AfterStageBehavior countStage();
/**
* Stage function that gets the index information of the collection on the source to re-create
* it.
*/
AfterStageBehavior listIndexesStage();
/**
* Stage function that creates the collection using the storageInterface. This stage does not
* actually contact the sync source.
*/
AfterStageBehavior createCollectionStage();
/**
* Stage function that executes a query to retrieve all documents in the collection. For each
* batch returned by the upstream node, handleNextBatch will be called with the data. This
* stage will finish when the entire query is finished or failed.
*/
AfterStageBehavior queryStage();
/**
* Put all results from a query batch into a buffer to be inserted, and schedule
* it to be inserted.
*/
void handleNextBatch(DBClientCursorBatchIterator& iter);
/**
* Called whenever there is a new batch of documents ready from the DBClientConnection.
*
* Each document returned will be inserted via the storage interfaceRequest storage
* interface.
*/
void insertDocumentsCallback(const executor::TaskExecutor::CallbackArgs& cbd);
// All member variables are labeled with one of the following codes indicating the
// synchronization rules for accessing them.
//
// (R) Read-only in concurrent operation; no synchronization required.
// (S) Self-synchronizing; access according to class's own rules.
// (M) Reads and writes guarded by _mutex (defined in base class).
// (X) Access only allowed from the main flow of control called from run() or constructor.
const NamespaceString _sourceNss; // (R)
const CollectionOptions _collectionOptions; // (R)
// Despite the type name, this member must always contain a UUID.
NamespaceStringOrUUID _sourceDbAndUuid; // (R)
// The size of the batches of documents returned in collection cloning.
int _collectionClonerBatchSize; // (R)
CollectionClonerStage _countStage; // (R)
CollectionClonerStage _listIndexesStage; // (R)
CollectionClonerStage _createCollectionStage; // (R)
CollectionClonerStage _queryStage; // (R)
ProgressMeter _progressMeter; // (X) progress meter for this instance.
std::vector<BSONObj> _indexSpecs; // (X) Except for _id_
BSONObj _idIndexSpec; // (X)
std::unique_ptr<CollectionBulkLoader> _collLoader; // (X)
TaskRunner _dbWorkTaskRunner; // (R)
// Function for scheduling database work using the executor.
ScheduleDbWorkFn _scheduleDbWorkFn; // (R)
// Documents read from source to insert.
std::vector<BSONObj> _documentsToInsert; // (M)
Stats _stats; // (M)
};
} // namespace repl
} // namespace mongo
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