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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 "mongo/db/repl/replication_metrics_gen.h"
#include "mongo/db/repl/topology_coordinator.h"
#include "mongo/db/service_context.h"
#include "mongo/platform/mutex.h"
namespace mongo {
namespace repl {
/**
* A service context decoration that stores metrics related to elections and replication health.
*/
class ReplicationMetrics {
public:
static ReplicationMetrics& get(ServiceContext* svc);
static ReplicationMetrics& get(OperationContext* opCtx);
ReplicationMetrics();
~ReplicationMetrics();
// Election metrics
void incrementNumElectionsCalledForReason(StartElectionReasonEnum reason);
void incrementNumElectionsSuccessfulForReason(StartElectionReasonEnum reason);
void incrementNumStepDownsCausedByHigherTerm();
void incrementNumCatchUps();
void incrementNumCatchUpsConcludedForReason(
ReplicationCoordinator::PrimaryCatchUpConclusionReason reason);
long getNumStepUpCmdsCalled_forTesting();
long getNumPriorityTakeoversCalled_forTesting();
long getNumCatchUpTakeoversCalled_forTesting();
long getNumElectionTimeoutsCalled_forTesting();
long getNumFreezeTimeoutsCalled_forTesting();
long getNumStepUpCmdsSuccessful_forTesting();
long getNumPriorityTakeoversSuccessful_forTesting();
long getNumCatchUpTakeoversSuccessful_forTesting();
long getNumElectionTimeoutsSuccessful_forTesting();
long getNumFreezeTimeoutsSuccessful_forTesting();
long getNumStepDownsCausedByHigherTerm_forTesting();
long getNumCatchUps_forTesting();
long getNumCatchUpsSucceeded_forTesting();
long getNumCatchUpsAlreadyCaughtUp_forTesting();
long getNumCatchUpsSkipped_forTesting();
long getNumCatchUpsTimedOut_forTesting();
long getNumCatchUpsFailedWithError_forTesting();
long getNumCatchUpsFailedWithNewTerm_forTesting();
long getNumCatchUpsFailedWithReplSetAbortPrimaryCatchUpCmd_forTesting();
// Election candidate metrics
// All the election candidate metrics that should be set when a node calls an election are set
// in this one function, so that the 'electionCandidateMetrics' section of replSetStatus shows a
// consistent state.
void setElectionCandidateMetrics(StartElectionReasonEnum reason,
Date_t lastElectionDate,
long long electionTerm,
OpTime lastCommittedOpTime,
OpTime lastSeenOpTime,
int numVotesNeeded,
double priorityAtElection,
Milliseconds electionTimeoutMillis,
boost::optional<int> priorPrimary);
void setTargetCatchupOpTime(OpTime opTime);
void setNumCatchUpOps(long numCatchUpOps);
void setCandidateNewTermStartDate(Date_t newTermStartDate);
void setWMajorityWriteAvailabilityDate(Date_t wMajorityWriteAvailabilityDate);
boost::optional<OpTime> getTargetCatchupOpTime_forTesting();
BSONObj getElectionMetricsBSON();
BSONObj getElectionCandidateMetricsBSON();
void clearElectionCandidateMetrics();
// Election participant metrics
// All the election participant metrics that should be set when a node votes in an election are
// set in this one function, so that the 'electionParticipantMetrics' section of replSetStatus
// shows a consistent state.
void setElectionParticipantMetrics(bool votedForCandidate,
long long electionTerm,
Date_t lastVoteDate,
int electionCandidateMemberId,
std::string voteReason,
OpTime lastAppliedOpTime,
OpTime maxAppliedOpTimeInSet,
double priorityAtElection);
BSONObj getElectionParticipantMetricsBSON();
void setParticipantNewTermDates(Date_t newTermStartDate, Date_t newTermAppliedDate);
void clearParticipantNewTermDates();
private:
class ElectionMetricsSSS;
void _updateAverageCatchUpOps(WithLock lk);
mutable Mutex _mutex = MONGO_MAKE_LATCH("ReplicationMetrics::_mutex");
ElectionMetrics _electionMetrics;
ElectionCandidateMetrics _electionCandidateMetrics;
ElectionParticipantMetrics _electionParticipantMetrics;
bool _nodeIsCandidateOrPrimary = false;
bool _nodeHasVotedInElection = false;
// This field is a double so that the division result in _updateAverageCatchUpOps will be a
// double without any casting.
double _totalNumCatchUpOps = 0.0;
};
} // namespace repl
} // namespace mongo
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