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/**
* Copyright (C) 2018-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/namespace_string.h"
#include "mongo/db/repl/replication_consistency_markers.h"
#include "mongo/db/repl/replication_consistency_markers_gen.h"
namespace mongo {
class BSONObj;
class OperationContext;
class Timestamp;
namespace repl {
class OpTime;
class StorageInterface;
struct TimestampedBSONObj;
class ReplicationConsistencyMarkersImpl : public ReplicationConsistencyMarkers {
ReplicationConsistencyMarkersImpl(const ReplicationConsistencyMarkersImpl&) = delete;
ReplicationConsistencyMarkersImpl& operator=(const ReplicationConsistencyMarkersImpl&) = delete;
public:
static constexpr StringData kDefaultMinValidNamespace = "local.replset.minvalid"_sd;
static constexpr StringData kDefaultOplogTruncateAfterPointNamespace =
"local.replset.oplogTruncateAfterPoint"_sd;
static constexpr StringData kDefaultInitialSyncIdNamespace = "local.replset.initialSyncId"_sd;
explicit ReplicationConsistencyMarkersImpl(StorageInterface* storageInterface);
ReplicationConsistencyMarkersImpl(StorageInterface* storageInterface,
NamespaceString minValidNss,
NamespaceString oplogTruncateAfterNss,
NamespaceString initialSyncIdNss);
void initializeMinValidDocument(OperationContext* opCtx) override;
bool getInitialSyncFlag(OperationContext* opCtx) const override;
void setInitialSyncFlag(OperationContext* opCtx) override;
void clearInitialSyncFlag(OperationContext* opCtx) override;
OpTime getMinValid(OperationContext* opCtx) const override;
void setMinValid(OperationContext* opCtx, const OpTime& minValid) override;
void ensureFastCountOnOplogTruncateAfterPoint(OperationContext* opCtx) override;
void setOplogTruncateAfterPoint(OperationContext* opCtx, const Timestamp& timestamp) override;
Timestamp getOplogTruncateAfterPoint(OperationContext* opCtx) const override;
void startUsingOplogTruncateAfterPointForPrimary() override;
void stopUsingOplogTruncateAfterPointForPrimary() override;
bool isOplogTruncateAfterPointBeingUsedForPrimary() const override;
void setOplogTruncateAfterPointToTopOfOplog(OperationContext* opCtx) override;
boost::optional<OpTimeAndWallTime> refreshOplogTruncateAfterPointIfPrimary(
OperationContext* opCtx) override;
void setAppliedThrough(OperationContext* opCtx, const OpTime& optime) override;
void clearAppliedThrough(OperationContext* opCtx) override;
OpTime getAppliedThrough(OperationContext* opCtx) const override;
Status createInternalCollections(OperationContext* opCtx) override;
void setInitialSyncIdIfNotSet(OperationContext* opCtx) override;
void clearInitialSyncId(OperationContext* opCtx) override;
BSONObj getInitialSyncId(OperationContext* opCtx) override;
private:
/**
* Reads the MinValid document from disk.
* Returns boost::none if not present.
*/
boost::optional<MinValidDocument> _getMinValidDocument(OperationContext* opCtx) const;
/**
* Updates the MinValid document according to the provided update spec. The collection must
* exist, see `createInternalCollections`. If the document does not exist, it is upserted.
*
* This fasserts on failure.
*/
void _updateMinValidDocument(OperationContext* opCtx, const BSONObj& updateSpec);
/**
* Reads the OplogTruncateAfterPoint document from disk.
* Returns boost::none if not present.
*/
boost::optional<OplogTruncateAfterPointDocument> _getOplogTruncateAfterPointDocument(
OperationContext* opCtx) const;
/**
* Updates the oplogTruncateAfterPoint with 'timestamp'. Callers should use this codepath when
* expecting write interruption errors.
*/
Status _setOplogTruncateAfterPoint(OperationContext* opCtx, const Timestamp& timestamp);
/**
* Upserts the OplogTruncateAfterPoint document according to the provided update spec. The
* collection must already exist. See `createInternalCollections`.
*/
Status _upsertOplogTruncateAfterPointDocument(OperationContext* opCtx,
const BSONObj& updateSpec);
StorageInterface* _storageInterface;
const NamespaceString _minValidNss;
const NamespaceString _oplogTruncateAfterPointNss;
const NamespaceString _initialSyncIdNss;
// Protects modifying and reading _isPrimary below.
mutable Mutex _truncatePointIsPrimaryMutex =
MONGO_MAKE_LATCH("ReplicationConsistencyMarkers::_truncatePointIsPrimaryMutex");
// Tracks whether or not the node is primary. Avoids potential deadlocks taking the replication
// coordinator's mutex to check replication state. Also remains false for standalones that do
// not use timestamps.
bool _isPrimary = false;
// Locks around fetching the 'all_durable' timestamp from the storage engine and updating the
// oplogTruncateAfterPoint. This prevents the oplogTruncateAfterPoint from going backwards in
// time in case of multiple callers to refreshOplogTruncateAfterPointIfPrimary.
mutable Mutex _refreshOplogTruncateAfterPointMutex =
MONGO_MAKE_LATCH("ReplicationConsistencyMarkers::_refreshOplogTruncateAfterPointMutex");
// In-memory cache of the of the oplog entry LTE to the oplogTruncateAfterPoint timestamp.
// Eventually matches the oplogTruncateAfterPoint timestamp when parallel writes finish. Avoids
// repeatedly writing the same oplogTruncateAfterPoint timestamp to disk, which creates noise in
// a silent system. Only set in state PRIMARY.
//
// Reset whenever setOplogTruncateAfterPoint() manually resets the truncate point: this could
// push the durable truncate point forwards or backwards in time, reflecting changes in the
// oplog. The truncate point is manually set in non-PRIMARY states.
//
// Note: these values lack their own specific concurrency control, instead depending on the
// serialization that exists in setting the oplog truncate after point.
boost::optional<Timestamp> _lastNoHolesOplogTimestamp;
boost::optional<OpTimeAndWallTime> _lastNoHolesOplogOpTimeAndWallTime;
};
} // namespace repl
} // namespace mongo
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