示例#1
0
void Learner :: OnAskforLearn(const PaxosMsg & oPaxosMsg)
{
    BP->GetLearnerBP()->OnAskforLearn();
    
    PLGHead("START Msg.InstanceID %lu Now.InstanceID %lu Msg.from_nodeid %lu MinChosenInstanceID %lu", 
            oPaxosMsg.instanceid(), GetInstanceID(), oPaxosMsg.nodeid(),
            m_poCheckpointMgr->GetMinChosenInstanceID());
    
    SetSeenInstanceID(oPaxosMsg.instanceid(), oPaxosMsg.nodeid());

    if (oPaxosMsg.proposalnodeid() == m_poConfig->GetMyNodeID())
    {
        //Found a node follow me.
        PLImp("Found a node %lu follow me.", oPaxosMsg.nodeid());
        m_poConfig->AddFollowerNode(oPaxosMsg.nodeid());
    }
    
    if (oPaxosMsg.instanceid() >= GetInstanceID())
    {
        return;
    }

    if (oPaxosMsg.instanceid() >= m_poCheckpointMgr->GetMinChosenInstanceID())
    {
        if (!m_oLearnerSender.Prepare(oPaxosMsg.instanceid(), oPaxosMsg.nodeid()))
        {
            BP->GetLearnerBP()->OnAskforLearnGetLockFail();

            PLGErr("LearnerSender working for others.");

            if (oPaxosMsg.instanceid() == (GetInstanceID() - 1))
            {
                PLGImp("InstanceID only difference one, just send this value to other.");
                //send one value
                AcceptorStateData oState;
                int ret = m_oPaxosLog.ReadState(m_poConfig->GetMyGroupIdx(), oPaxosMsg.instanceid(), oState);
                if (ret == 0)
                {
                    BallotNumber oBallot(oState.acceptedid(), oState.acceptednodeid());
                    SendLearnValue(oPaxosMsg.nodeid(), oPaxosMsg.instanceid(), oBallot, oState.acceptedvalue(), 0);
                }
            }
            
            return;
        }
    }
    
    SendNowInstanceID(oPaxosMsg.instanceid(), oPaxosMsg.nodeid());
}
示例#2
0
void Learner :: OnSendLearnValue(const PaxosMsg & oPaxosMsg)
{
    BP->GetLearnerBP()->OnSendLearnValue();

    PLGHead("START Msg.InstanceID %lu Now.InstanceID %lu Msg.ballot_proposalid %lu Msg.ballot_nodeid %lu Msg.ValueSize %zu",
            oPaxosMsg.instanceid(), GetInstanceID(), oPaxosMsg.proposalid(), 
            oPaxosMsg.nodeid(), oPaxosMsg.value().size());

    if (oPaxosMsg.instanceid() > GetInstanceID())
    {
        PLGDebug("[Latest Msg] i can't learn");
        return;
    }
    else if (oPaxosMsg.instanceid() < GetInstanceID())
    {
        PLGDebug("[Lag Msg] no need to learn");
        return;
    }

    //learn value
    BallotNumber oBallot(oPaxosMsg.proposalid(), oPaxosMsg.proposalnodeid());
    int ret = m_oLearnerState.LearnValue(oPaxosMsg.instanceid(), oBallot, oPaxosMsg.value(), GetLastChecksum());
    if (ret != 0)
    {
        PLGErr("LearnState.LearnValue fail, ret %d", ret);
        return;
    }
    
    PLGHead("END LearnValue OK, proposalid %lu proposalid_nodeid %lu valueLen %zu", 
            oPaxosMsg.proposalid(), oPaxosMsg.nodeid(), oPaxosMsg.value().size());

    if (oPaxosMsg.flag() == PaxosMsgFlagType_SendLearnValue_NeedAck)
    {
        //every time' when receive valid need ack learn value, reset noop timeout.
        Reset_AskforLearn_Noop();

        SendLearnValue_Ack(oPaxosMsg.nodeid());
    }
}