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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 <set>
#include <string>
#include "mongo/db/service_context.h"
#include "mongo/platform/mutex.h"
namespace mongo {
/**
* This class is for use with storage engines that track record store sizes in catalog metadata.
*
* During normal server operation, we adjust the size metadata for all record stores. But when
* performing replication recovery, we avoid doing so, as we trust that the size metadata on disk is
* already correct with respect to the end state of recovery.
*
* However, there may be exceptions that require the server to adjust size metadata even during
* recovery. One such case is the oplog: during rollback, the oplog is truncated, and then recovery
* occurs using oplog entries after the common point from the sync source. The server will need to
* adjust the size metadata for the oplog collection to ensure that the count of oplog entries is
* correct after rollback recovery.
*
* This class is responsible for keeping track of idents that require this special
* count adjustment.
*/
class SizeRecoveryState {
public:
/**
* If replication recovery is ongoing, returns false unless 'ident' has been specifically marked
* as requiring adjustment even during recovery.
*
* If the system is not currently undergoing replication recovery, always returns true.
*/
bool collectionNeedsSizeAdjustment(const std::string& ident) const;
/**
* Returns whether 'ident' has been specifically marked as requiring adjustment even during
* recovery.
*/
bool collectionAlwaysNeedsSizeAdjustment(const std::string& ident) const;
/**
* Mark 'ident' as always requiring size adjustment, even if replication recovery is ongoing.
*/
void markCollectionAsAlwaysNeedsSizeAdjustment(const std::string& ident);
/**
* Clears all internal state. This method should be called before calling 'recover to a stable
* timestamp'.
*/
void clearStateBeforeRecovery();
private:
mutable Mutex _mutex = MONGO_MAKE_LATCH("SizeRecoveryState::_mutex");
StringSet _collectionsAlwaysNeedingSizeAdjustment;
};
/**
* Returns a mutable reference to the single SizeRecoveryState associated with 'serviceCtx'.
*/
SizeRecoveryState& sizeRecoveryState(ServiceContext* serviceCtx);
/**
* Returns a mutable reference to a boolean decoration on 'serviceCtx', which indicates whether or
* not the server is currently undergoing replication recovery.
*/
bool& inReplicationRecovery(ServiceContext* serviceCtx);
} // namespace mongo
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