// TakeCheckpoint logs a checkpoint record to the wal.
func (this *Election) TakeCheckpoint() error {
lock := this.ctlr.ReadLockAll()
defer lock.Unlock()
if this.MajoritySize() <= 0 {
this.Errorf("election instance is not yet configured")
return errs.ErrInvalid
}
checkpoint := thispb.Checkpoint{}
config := thispb.Configuration{}
this.doSaveConfig(&config)
checkpoint.Configuration = &config
if this.InCommittee() {
state := thispb.CommitteeState{}
this.doSaveCommittee(&state)
checkpoint.CommitteeState = &state
}
state := thispb.ElectionState{}
this.doSaveElection(&state)
checkpoint.ElectionState = &state
walRecord := thispb.WALRecord{}
walRecord.Checkpoint = &checkpoint
errAppend := wal.AppendCheckpointProto(this.wal, this.uid, &walRecord)
if errAppend != nil {
this.Errorf("could not append checkpoint record: %v", errAppend)
return errAppend
}
// Checkpoint recent paxos instances' state.
if this.InCommittee() {
state := checkpoint.CommitteeState
for _, round := range state.ElectionRoundList {
if paxos, ok := this.classicPaxosMap[round]; ok {
if err := paxos.TakeCheckpoint(); err != nil {
this.Errorf("could not take checkpoint of paxos instance for "+
"round %d: %v", err)
return err
}
}
}
}
return nil
}
// TakeCheckpoint saves current state into the wal as a checkpoint record.
func (this *Paxos) TakeCheckpoint() error {
lock := this.ctlr.ReadLockAll()
defer lock.Unlock()
if !this.IsConfigured() {
this.Errorf("classic paxos instance is not yet configured")
return errs.ErrInvalid
}
checkpoint := thispb.Checkpoint{}
config := thispb.Configuration{}
this.doSaveConfiguration(&config)
checkpoint.Configuration = &config
if this.IsProposer() {
state := thispb.ProposerState{}
this.doSaveProposer(&state)
checkpoint.ProposerState = &state
}
if this.IsAcceptor() {
state := thispb.AcceptorState{}
this.doSaveAcceptor(&state)
checkpoint.AcceptorState = &state
}
if this.IsLearner() {
state := thispb.LearnerState{}
this.doSaveLearner(&state)
checkpoint.LearnerState = &state
}
walRecord := thispb.WALRecord{}
walRecord.Checkpoint = &checkpoint
errAppend := wal.AppendCheckpointProto(this.wal, this.uid, &walRecord)
if errAppend != nil {
this.Errorf("could not append checkpoint record: %v", errAppend)
return errAppend
}
return nil
}