提案通过后，为啥leader节点先执行状态机

[ziyinweixiao]

为什么提案通过后，leader 先执行状态机，这个优化点算是优化在哪里
void Learner :: ProposerSendSuccess(
const uint64_t llLearnInstanceID,
const uint64_t llProposalID)
{
BP->GetLearnerBP()->ProposerSendSuccess();

PaxosMsg oPaxosMsg;

oPaxosMsg.set_msgtype(MsgType_PaxosLearner_ProposerSendSuccess);
oPaxosMsg.set_instanceid(llLearnInstanceID);

NodeIDMsg * oNodeIDMsg = oPaxosMsg.mutable_nodeid();
NodeID2NodeIDMsg(m_poConfig->GetMyNodeID(), oNodeIDMsg);

oPaxosMsg.set_proposalid(llProposalID);
oPaxosMsg.set_lastchecksum(GetLastChecksum());

//run self first
BroadcastMessage(oPaxosMsg, BroadcastMessage_Type_RunSelf_First);

}