第二次调用findCachedClient是否多余?

[carlos19960601]

在这段逻辑中，第二次调用findCachedClient是否多余？
在什么情况下第1次调用findCachedClient时client == nil，而第2次调用的时候client != nil呢？

rpcx/client/xclient.go

Lines 290 to 301 in 6b17ab2

	c.mu.Lock()
	client = c.findCachedClient(k, servicePath, serviceMethod)
	if client != nil {
	if !client.IsClosing() && !client.IsShutdown() {
	c.mu.Unlock()
	return client, nil
	}
	c.deleteCachedClient(client, k, servicePath, serviceMethod)
	}
	client = c.findCachedClient(k, servicePath, serviceMethod)
	c.mu.Unlock()

[smallnest]

第一次选出的client正在被关闭