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/**
* Copyright (C) 2014 MongoDB Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* 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
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* 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 GNU Affero General 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
namespace mongo {
class BSONObj;
class OperationContext;
namespace repl {
class OpTime;
/**
* Helper functions for maintaining local.replset.minvalid collection contents.
*
* When a member reaches its minValid optime it is in a consistent state. Thus, minValid is
* set as the last step in initial sync. At the beginning of initial sync, _initialSyncFlag
* is appended onto minValid to indicate that initial sync was started but has not yet
* completed.
* minValid is also used during "normal" sync: the last op in each batch is used to set
* minValid, to indicate that we are in a consistent state when the batch has been fully
* applied.
*/
/**
* The initial sync flag is used to durably record the state of an initial sync; its boolean
* value is true when an initial sync is in progress and hasn't yet completed. The flag
* is stored as part of the local.replset.minvalid collection.
*/
void clearInitialSyncFlag(OperationContext* txn);
void setInitialSyncFlag(OperationContext* txn);
bool getInitialSyncFlag();
/**
* The minValid value is the earliest (minimum) Timestamp that must be applied in order to
* consider the dataset consistent. Do not allow client reads if our last applied operation is
* before the minValid time.
*/
void setMinValid(OperationContext* ctx, const OpTime& opTime);
OpTime getMinValid(OperationContext* txn);
}
}
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