Exemple #1
0
void ReplicatedLog::OnRequestChosen(PaxosMessage& imsg)
{
    Buffer          value;
    PaxosMessage    omsg;
    
#ifdef RLOG_DEBUG_MESSAGES
    Log_Debug("ReplicatedLog::OnRequestChosen, imsg.paxosID = %U, mine = %U",
     imsg.paxosID, GetPaxosID());
#endif

    if (imsg.paxosID >= GetPaxosID())
        return;
    
    // the node is lagging and needs to catch-up
    context->GetDatabase()->GetAcceptedValue(imsg.paxosID, value);
    if (value.GetLength() > 0)
    {
        Log_Trace("Sending paxosID %d to node %d", imsg.paxosID, imsg.nodeID);
        omsg.LearnValue(imsg.paxosID, MY_NODEID, 0, value);
    }
    else
    {
        Log_Trace("Node requested a paxosID I no longer have");
        omsg.StartCatchup(paxosID, MY_NODEID);
    }
    context->GetTransport()->SendMessage(imsg.nodeID, omsg);
}
Exemple #2
0
void ReplicatedLog::OnRequest(PaxosMessage& imsg)
{
    Buffer          value;
    PaxosMessage    omsg;

    Log_Trace();

    if (imsg.paxosID < GetPaxosID())
    {
        context->GetDatabase()->GetAcceptedValue(imsg.paxosID, value);
        if (value.GetLength() == 0)
            return;
        omsg.LearnValue(imsg.paxosID, MY_NODEID, 0, value);
        context->GetTransport()->SendMessage(imsg.nodeID, omsg);
    }
    else if (GetPaxosID() < imsg.paxosID)
    {
        //  I am lagging and need to catch-up
        RequestChosen(imsg.nodeID);
    }
}