apache
consumer 使用 url 时，启动若无法连接服务，会直接panic
dubbo.yaml 中按照如下配置 consumer，check设置为了false，但是启动时会因为无法连接url服务而直接panic。 java 项目就没有这个问题。
consumer:
request-timeout: 20s
check: false
filter: "cshutdown" #common-filter,
references:
SampleService:
check: false
registry-ids:
- localzk
Retries: "1"
protocol: "dubbo"
interface: "com.demo.SampleService"
url: "dubbo://com.demo.sampleservice:20008"
错误信息如下：
2022-08-04T14:31:06.937+0800 ERROR getty/getty_client.go:167 try to connect server com.demo.sampleservice:20008 failed for : failed to create client connection to com.demo.sampleservice:20008 in 3s dubbo.apache.org/dubbo-go/v3/remoting/getty.(*Client).Connect /Users/huangjun/go/pkg/mod/dubbo.apache.org/dubbo-go/[email protected]/remoting/getty/getty_client.go:167 dubbo.apache.org/dubbo-go/v3/remoting.(*ExchangeClient).doInit /Users/huangjun/go/pkg/mod/dubbo.apache.org/dubbo-go/[email protected]/remoting/exchange_client.go:86 dubbo.apache.org/dubbo-go/v3/remoting.NewExchangeClient /Users/huangjun/go/pkg/mod/dubbo.apache.org/dubbo-go/[email protected]/remoting/exchange_client.go:74 dubbo.apache.org/dubbo-go/v3/protocol/dubbo.getExchangeClient.func1 /Users/huangjun/go/pkg/mod/dubbo.apache.org/dubbo-go/[email protected]/protocol/dubbo/dubbo_protocol.go:200 dubbo.apache.org/dubbo-go/v3/protocol/dubbo.getExchangeClient /Users/huangjun/go/pkg/mod/dubbo.apache.org/dubbo-go/[email protected]/protocol/dubbo/dubbo_protocol.go:208 dubbo.apache.org/dubbo-go/v3/protocol/dubbo.(*DubboProtocol).Refer /Users/huangjun/go/pkg/mod/dubbo.apache.org/dubbo-go/[email protected]/protocol/dubbo/dubbo_protocol.go:91 dubbo.apache.org/dubbo-go/v3/config.(*ReferenceConfig).Refer /Users/huangjun/go/pkg/mod/dubbo.apache.org/dubbo-go/[email protected]/config/reference_config.go:197 dubbo.apache.org/dubbo-go/v3/config.(*ConsumerConfig).Load /Users/huangjun/go/pkg/mod/dubbo.apache.org/dubbo-go/[email protected]/config/consumer_config.go:130 dubbo.apache.org/dubbo-go/v3/config.(*RootConfig).Start.func1 /Users/huangjun/go/pkg/mod/dubbo.apache.org/dubbo-go/[email protected]/config/root_config.go:203 sync.(*Once).doSlow /usr/local/go/src/sync/once.go:68 sync.(*Once).Do /usr/local/go/src/sync/once.go:59 dubbo.apache.org/dubbo-go/v3/config.(*RootConfig).Start /Users/huangjun/go/pkg/mod/dubbo.apache.org/dubbo-go/[email protected]/config/root_config.go:201 dubbo.apache.org/dubbo-go/v3/config.(*RootConfig).Init /Users/huangjun/go/pkg/mod/dubbo.apache.org/dubbo-go/[email protected]/config/root_config.go:196 dubbo.apache.org/dubbo-go/v3/config.Load /Users/huangjun/go/pkg/mod/dubbo.apache.org/dubbo-go/[email protected]/config/config_loader.go:57
please refer to https://github.com/apache/dubbo-go/blob/1d6b35ff267c0eb668cddc95d98248d491723d56/config/reference_config.go#L150.
this param is used to specify the registry or the provider address like tri://127.0.0.1:20000.
you can try replacing com.demo.sampleservice with the IP address of the provider.
actually the thing is that we are using istio to match dubbo service, this url param is set like this because we designed to have a service named this. now the service is not yet started when dubbogo starts, so it directly panic. we can prevent this error by starting the provider first, then consumer starts ok. but, this will depend on service schedule sequence which is not really acceptable in practive. besides, if we have two service depends on each other(consumer for each other), this two will never be able to start due to startup panic by setting dubbogo url this way. The java version of dubbo works fine in this situation
但是panic会导致整个程序无法启动。依赖的服务没有启起来的情况下，自己也无法启动，这不合理吧
晚上9点dubbogo周会，到时候我会把会议连接发到 dubbogo 社区钉钉群 23331795，你晚上如果有空的话来参加下。