Esempio n. 1
0
func BallotAccumulatorFromData(txnId *common.TxnId, txn *msgs.Txn, outcome *outcomeEqualId, instances *msgs.InstancesForVar_List) *BallotAccumulator {
	ba := NewBallotAccumulator(txnId, txn)
	ba.outcome = outcome

	for idx, l := 0, instances.Len(); idx < l; idx++ {
		// All instances that went to disk must be complete. But in the
		// case of a retry, not all instances must be complete before
		// going to disk.
		ba.incompleteVars--
		instancesForVar := instances.At(idx)
		acceptedInstances := instancesForVar.Instances()
		vUUId := common.MakeVarUUId(instancesForVar.VarId())
		vBallot := ba.vUUIdToBallots[*vUUId]
		rmBals := rmBallots(make([]*rmBallot, acceptedInstances.Len()))
		vBallot.rmToBallot = rmBals
		for idy, m := 0, acceptedInstances.Len(); idy < m; idy++ {
			acceptedInstance := acceptedInstances.At(idy)
			ballot := acceptedInstance.Ballot()
			rmBal := &rmBallot{
				instanceRMId: common.RMId(acceptedInstance.RmId()),
				ballot:       eng.BallotFromCap(&ballot),
				roundNumber:  paxosNumber(acceptedInstance.RoundNumber()),
			}
			rmBals[idy] = rmBal
		}
		result := instancesForVar.Result()
		vBallot.result = eng.BallotFromCap(&result)
	}

	return ba
}
Esempio n. 2
0
// For every vUUId involved in this txn, we should see fInc * ballots:
// one from each RM voting for each vUUId. rmId is the paxos
// instanceRMId.
func (ba *BallotAccumulator) BallotReceived(instanceRMId common.RMId, inst *instance, vUUId *common.VarUUId, txn *msgs.Txn) *outcomeEqualId {
	if isDeflated(ba.Txn) && !isDeflated(txn) {
		ba.Txn = txn
	}

	vBallot := ba.vUUIdToBallots[*vUUId]
	if vBallot.rmToBallot == nil {
		vBallot.rmToBallot = rmBallots(make([]*rmBallot, 0, vBallot.voters))
	}
	ballot := eng.BallotFromCap(inst.accepted)
	found := false
	for idx, rBal := range vBallot.rmToBallot {
		if found = rBal.instanceRMId == instanceRMId; found {
			vBallot.rmToBallot[idx].ballot = ballot
			break
		}
	}
	if !found {
		rmBal := &rmBallot{
			instanceRMId: instanceRMId,
			ballot:       ballot,
			roundNumber:  inst.acceptedNum,
		}
		vBallot.rmToBallot = append(vBallot.rmToBallot, rmBal)
		if len(vBallot.rmToBallot) == vBallot.voters {
			ba.incompleteVars--
		}
		if len(vBallot.rmToBallot) >= vBallot.voters {
			vBallot.rmToBallot.Sort()
		}
	}
	if len(vBallot.rmToBallot) >= vBallot.voters {
		vBallot.result = nil
		ba.dirty = true
	}
	return ba.determineOutcome()
}