Failed to invoke the method com.***.****.XxxxService .No provider is available because can't connect server.

[drama10096]

Environment

• Server: java提供的dubbo服务, dubbo版本2.7.3
• Client: Dubbo-go, v1.5.8
• Protocol:dubbo
• Registry: zookeeper

Issue description

通过dubbo-go客户端调用java提供的dubbo服务，报“No provider is available because can't connect server” 这种奇怪错误（偶现的，感觉机器负载压力高的时候会出现），查不到相关资料，在容器内部 telnet 命令访问目标dubbo服务的ip和端口是能正常通信的，dubbo管控台也正常体现provider的服务

Logs

Click me to check logs

Failed to invoke the method getHealthyEnvConfigListByShowTypeV2 of the service com.aaaa.bbbb.healthy.HealthyService .No provider is available because can't connect server.

[drama10096]

[chickenlj]

The picture is broken.

[drama10096]

The picture is broken.

又出现这个问题了，原始堆栈如下

Failed to invoke the method batchPkgUpgradeByRange of the service com.xxx.xxx.xx.IUpgradeService .No provider is available because can't connect server.

[drama10096]

Environment
Server: java提供的dubbo服务, dubbo版本2.7.3
Client: Dubbo-go, v1.5.8
Protocol:dubbo
Registry: zookeeper

dubbo-go源码中的代码位置：
cluster/cluster_impl/failover_cluster_invoker.go:49
日志打印代码：
"Failed to invoke the method %s of the service %s .No provider is available because can't connect server."

这里的server是个什么意思？？？ 日志里没体现IP或端口地址