func (this *Paxos) doUpdateConfig(change *thispb.Configuration) error {
if !this.wal.IsRecovering() {
record := thispb.WALRecord{}
record.ConfigChange = change
_, errQueue := wal.QueueChangeProto(this.wal, this.uid, &record)
if errQueue != nil {
this.Errorf("could not append config change wal record: %v", errQueue)
return errQueue
}
}
this.doRestoreConfig(change)
return nil
}
func (this *Paxos) doUpdateLearner(change *thispb.LearnerChange) error {
if this.chosenValue != nil {
return nil
}
if !this.wal.IsRecovering() {
walRecord := thispb.WALRecord{}
walRecord.LearnerChange = change
_, errQueue := wal.QueueChangeProto(this.wal, this.uid, &walRecord)
if errQueue != nil {
this.Errorf("could not write learner change record: %v", errQueue)
return errQueue
}
}
if change.ChosenValue != nil {
this.chosenValue = change.GetChosenValue()
this.Infof("consensus result learned from proposer is %s",
this.chosenValue)
if this.watch != nil {
this.watch.ConsensusUpdate(this.uid, -1, this.chosenValue)
}
return nil
}
acceptor := change.GetVotedAcceptor()
for index := range change.VotedBallotList {
ballot := change.VotedBallotList[index]
value := change.VotedValueList[index]
this.ballotValueMap[ballot] = value
acceptorSet, found := this.ballotAcceptorsMap[ballot]
if !found {
acceptorSet = make(map[string]struct{})
this.ballotAcceptorsMap[ballot] = acceptorSet
}
acceptorSet[acceptor] = struct{}{}
if len(acceptorSet) >= this.MajoritySize() {
this.chosenValue = value
this.Infof("consensus result learned through votes is %s", value)
if this.watch != nil {
this.watch.ConsensusUpdate(this.uid, -1, this.chosenValue)
}
}
}
return nil
}
func (this *Election) doUpdateElection(change *thispb.ElectionChange) error {
if !this.wal.IsRecovering() {
walRecord := thispb.WALRecord{}
walRecord.ElectionChange = change
_, errQueue := wal.QueueChangeProto(this.wal, this.uid, &walRecord)
if errQueue != nil {
this.Errorf("could not write election change wal record: %v", errQueue)
return errQueue
}
}
atomic.StoreInt64(&this.currentRound, change.GetElectionRound())
this.currentWinner = change.GetElectionWinner()
return nil
}