异步客户端转发到leader

[gaodq]

floyd/floyd/src/floyd_impl.cc

Lines 555 to 557 in 01a6979

	return worker_client_pool_->SendAndRecv(
	slash::IpPortString(leader_ip, leader_port),
	request, response);

如果这里用异步客户端，可以并发处理多个转发到leader的操作，是不是会加速。

[baotiao]

yes, that's right. However, when we support asynchronized client or use multi clients, we should deal with the situation that the later logs may received before the previous logs.
You can have a try, guy. After adding multi clients, I think it violate the raft's original intention that raft is a consensus algorithm that is designed for easily understanding. However, performance is more important than understanding in industry.