nacos报错：Nacos cluster is running with 1.X mode, can't accept gRPC request temporarily

nacos报错：Nacos cluster is running with 1.X mode, can't accept gRPC request temporarily

nacos报错如下：

Caused by: com.alibaba.nacos.api.exception.NacosException: Request nacos server failed: 
        at com.alibaba.nacos.client.naming.remote.gprc.NamingGrpcClientProxy.requestToServer(NamingGrpcClientProxy.java:227)
        at com.alibaba.nacos.client.naming.remote.gprc.NamingGrpcClientProxy.deregisterService(NamingGrpcClientProxy.java:127)
        ... 49 common frames omitted
        
Caused by: com.alibaba.nacos.api.exception.NacosException: Nacos cluster is running with 1.X mode, can't accept gRPC request temporarily. Please check the server status or close Double write to force open 2.0 mode. Detail https://nacos.io/en-us/docs/2.0.0-upgrading.html.
        at com.alibaba.nacos.client.naming.remote.gprc.NamingGrpcClientProxy.requestToServer(NamingGrpcClientProxy.java:219)

解决方法：

关闭nacos双写。

在2.0.3版本默认开启双写，只要nacos集群其中一个节点挂掉，剩余节点如果不将这个节点从地址列表中移除，只要重启便会出现服务降级；另外在并发部署的情况下，也有可能出现服务降级。

关闭双写会关闭运行中服务降级的入口，所以2.x服务运行稳定后一定要关闭双写。

否则在一定的场景下可能出现服务降级导致部分节点不可用。

• nacos查看节点监控：

curl -X GET 'nacos的ip:端口/nacos/v1/ns/upgrade/ops/metrics'

结果如下：

可以看到 isDoubleWriteEnabled = true，双写是开启的。

[logs@xx logs]$ curl -X GET 'nacos的ip:端口/nacos/v1/ns/upgrade/ops/metrics'
upgraded                       = false
isAll20XVersion                = true
isDoubleWriteEnabled           = true
doubleWriteDelayTaskCount      =     0
serviceCountV1                 =     0
instanceCountV1                =     0
serviceCountV2                 =     0
instanceCountV2                =    16
subscribeCountV2               =     0
responsibleServiceCountV1      =     0
responsibleInstanceCountV1     =     0
ephemeralServiceCountV2        =     0
persistentServiceCountV2       =     0
ephemeralInstanceCountV2       =     0
persistentInstanceCountV2      =     0
service.V1.not.in.V2           =
service.V2.not.in.V1           =

nacos关闭双写：

 curl -X PUT 'nacos的ip:端口/nacos/v1/ns/operator/switches?entry=doubleWriteEnabled&value=false'

如果报错403，如下：

"status":403,"error":"Forbidden","message":"unknown user!

就需要就加上账号密码：

 curl -X PUT 'nacos的ip:端口/nacos/v1/ns/operator/switches?entry=doubleWriteEnabled&value=false&username=xx&password=xx'

显示ok，关闭双写成功，重新启动服务即可。

参考资料：

https://nacos.io/zh-cn/blog/xiaomi-scale.html

https://zhuanlan.zhihu.com/p/482212172