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Waiting server-side response timeout by scan timer. start time: 2020-12-23 16:16:36.298, end time: 2020-12-23 16:16:42.300, client elapsed: 0 ms, server elapsed: 6002 ms, timeout: 6000 ms,

dubbo 中的默认超时是 1000 毫秒。

在 consumer 模块中 dubbo-consumer.xml 配置 timeout ：

<dubbo:reference id="demoService" interface="demo.contract.DemoService" check="false" timeout="2000"/>

运行 ConsumerMain，会看到：

Exception in thread “main” org.apache.dubbo.rpc.RpcException: Failed to invoke the method sayHello in the service demo.contract.DemoService. Tried 3 times of the providers [127.0.0.1:20881] (1/1) from the registry 127.0.0.1:2181 on the consumer 127.0.0.1 using the dubbo version 2.7.1. Last error is: Invoke remote method timeout. method: sayHello, provider: dubbo://127.0.0.1:20881/demo.contract….
….
Caused by: org.apache.dubbo.remoting.TimeoutException: Waiting server-side response timeout by scan timer.

为什么是 Tried 3 times ？ 因为 retries 参数默认值是 2 。正常的1次加上重试的2次，一共3次。要修改重试次数，可以：

<dubbo:reference id=”demoService”
interface=”demo.contract.DemoService”
check=”false” timeout=”2000″ retries=”3″/>

配置 provider 超时

去掉上面 dubbo-consumer.xml 中配置的超时，在 dubbo-provider.xml 中配置 timeout：

<dubbo:service interface=”demo.contract.DemoService” class=”demo.provider.DemoServiceImpl” timeout=”2000″/>

Exception in thread “main” org.apache.dubbo.rpc.RpcException: Failed to invoke the method sayHello in the service demo.contract.DemoService. Tried 3 times of the providers [127.0.0.1:20881] (1/1) from the registry 127.0.0.1:2181 on the consumer 127.0.0.1 using the dubbo version 2.7.1. Last error is: Invoke remote method timeout.

aused by: org.apache.dubbo.remoting.TimeoutException: Waiting server-side response timeout.

优先级

如果 provider 配置超时为 6000，consumer 配置超时为 2000，报超时错误。

如果 provider 配置超时为 2000，consumer 配置超时为 6000，正常运行，不会报超时错误。

可见，consumer超时和provider超时无法共存，consumer超时优先provider。

一般建议在 provider 配置超时，因为 provider 更清楚要配置为多少。consumer 配置的超时要参考 provider 配置的值。

默认全局超时

可以用 <dubbo:provider /> 配置 provider 的全局超时；用 <dubbo:consumer/> 在 consumer 侧配置超时。

例如：

<dubbo:provider timeout=”2000″/>

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