checkpoint 接收新的状态机 paxos_log日志，重建index后， 在下次重启前以及checkpoint文件传输前，propose超时定时器超时，写入llstance到paxos_log

[huangyu6572]

checkpoint 接收新的状态机流程
//清空paxos_log 日志
I0630 09:04:03.638077 5242 logger_google.cpp:111] �[45;37m Showy(0): PN8phxpaxos8InstanceE::OnReceiveCheckpointMsg Now.InstanceID 737 MsgType 1 Msg.from_nodeid 72058139498785641 My.nodeid 72058139498785639 flag 1 uuid 72058141452437945 sequence 0 checksum 0 offset 0 buffsize 0 filepath �[0m
W0630 09:04:03.638098 5242 logger_google.cpp:103] �[44;37m Imp(0): PN8phxpaxos7LearnerE::OnSendCheckpoint START uuid 72058141452437945 flag 1 sequence 0 cpi 759 checksum 0 smid 0 offset 0 buffsize 0 filepath �[0m
W0630 09:04:03.638497 5242 logger_google.cpp:103] �[44;37m Imp(0): PN8phxpaxos18CheckpointReceiverE::ClearCheckpointTmp rm dir ./storage/paxoslog_0/g0/cp_tmp_1 done! �[0m
I0630 09:04:03.638594 5242 logger_google.cpp:111] �[45;37m DEBUG(0): PN8phxpaxos8DatabaseE::GetFromLevelDB LevelDB.Get not found, instanceid 18446744073709551614 �[0m
W0630 09:04:03.644414 5242 logger_google.cpp:103] �[44;37m Imp(0): PN8phxpaxos8LogStoreE::RebuildIndex START fileid 0 offset 0 checksum 0 �[0m
I0630 09:04:03.644502 5242 logger_google.cpp:111] �[45;37m DEBUG(0): PN8phxpaxos8LogStoreE::RebuildIndexForOneFile file not exist, filepath ./storage/paxoslog_0/g0/vfile/0.f �[0m

I0630 09:04:03.644512 5242 logger_google.cpp:111] �[45;37m Showy(0): PN8phxpaxos8LogStoreE::RebuildIndex END rebuild ok, nowfileid 0 �[0m
I0630 09:04:03.644532 5242 logger_google.cpp:111] �[45;37m Showy(0): PN8phxpaxos8LogStoreE::OpenFile ok, path ./storage/paxoslog_0/g0/vfile/0.f �[0m

//很早之前的 提议的超时计数器 ，又把新的最大值写入了！
W0630 09:04:05.859681 5242 logger_google.cpp:103] �[44;37m Imp(0): PN8phxpaxos8AcceptorE::OnPrepare START Msg.InstanceID 737 Msg.from_nodeid 72058139498785639 Msg.ProposalID 215 �[0m
I0630 09:04:05.859699 5242 logger_google.cpp:111] �[45;37m DEBUG(0): PN8phxpaxos8AcceptorE::OnPrepare [Promise] State.PromiseID 215 State.PromiseNodeID 72058139498785639 State.PreAcceptedID 214 State.PreAcceptedNodeID 72058139498785641 �[0m

//触发了paxos_log 日志的写入,有可能 导致下次启动时llCPInstanceID <= llLogMaxInstanceID
I0630 09:04:05.864318 5242 logger_google.cpp:111] �[45;37m Showy(0): PN8phxpaxos8LogStoreE::Append ok, offset 0 fileid 0 checksum 3803452448 instanceid 737 buffer size 67 usetime 4ms sync 1 �[0m
I0630 09:04:05.864400 5242 logger_google.cpp:111] �[45;37m Showy(0): PN8phxpaxos13AcceptorStateE::Persist GroupIdx 0 InstanceID 737 PromiseID 215 PromiseNodeID 72058139498785639 AccectpedID 214 AcceptedNodeID 72058139498785641 ValueLen 30 Checksum 2622589103 �[0m
W0630 09:04:05.864413 5242 logger_google.cpp:103] �[44;37m Imp(0): PN8phxpaxos8AcceptorE::OnPrepare END Now.InstanceID 737 ReplyNodeID 72058139498785639 �[0m

//数据传输完成 以及 自杀
W0630 09:04:13.641677 5242 logger_google.cpp:103] �[44;37m Imp(0): PN8phxpaxos7LearnerE::OnSendCheckpoint START uuid 72058141452437945 flag 3 sequence 9 cpi 759 checksum 0 smid 0 offset 0 buffsize 0 filepath �[0m
I0630 09:04:13.642592 5242 logger_google.cpp:111] �[45;37m Showy(0): PN8phxpaxos7LearnerE::OnSendCheckpoint_End All sm load state ok, start to exit process �[0m

// 下次重启触发,导致run paxos失败
PLGErr("checkpoint instanceid %lu larger than log max instanceid %lu. "
"Please ensure that your checkpoint data is correct. "
"If you ensure that, just delete all paxos log data and restart.",
llCPInstanceID, llLogMaxInstanceID);

[huangyu6572]

#158

[huangyu6572]

instance.cpp +504
if (oPaxosMsg.msgtype() == MsgType_PaxosPrepare
|| oPaxosMsg.msgtype() == MsgType_PaxosAccept)
{
//add
if (m_oCheckpointMgr.InAskforcheckpointMode())
{
PLGImp("in ask for checkpoint mode, ignord paxosmsg");
return 0;
}