客户端订阅数据是采用的dubbo“参数回调”功能，客户端调用addListener（一次调用）后会等待服务端消息的回调。现在核心的问题：provider挂掉或网络异常后，客户端无感知，也不重试，没有任何报错信息，按理此时长连接已断开，所以想了解dubbo里面“参数回到“的机制，怎么保证连接的稳定性。参数回调文档：https://dubbo.incubator.apache.org/zh-cn/docs/user/demos/callback-parameter.html
[ Full content available at: https://github.com/apache/incubator-dubbo/issues/2783 ] This message was relayed via gitbox.apache.org for notifications@dubbo.apache.org
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