yhs0092 commented on issue #1431: 微服务之间调用的时候，提示Probably invoke a service before it is registered, or no instance found for it URL: https://github.com/apache/servicecomb-java-chassis/issues/1431#issuecomment-561035016 在打印`Probably invoke a service before it is registered, or no instance found for it`日志之前，有没有什么error或者warning日志呢？ 举个例子，如果consumer无法从sc查到provider的服务，会打印这样的日志 ``` [2019-12-03 15:06:05,705/CST][registry-vert.x-eventloop-thread-0][WARN]failed to findInstances: {"errorCode":"400012","errorMessage":"Micro-service does not exist","detail":"Consumer[0a575d066669cf0ed8117101d47921e240c8564c][/Weak-Contract-Type-Exam/consumer/0.0.1] find provider[/Weak-Contract-Type-Exam/provider/0.0.0+] failed, provider does not exist."} org.apache.servicecomb.serviceregistry.client.http.ServiceRegistryClientImpl.lambda$null$7(ServiceRegistryClientImpl.java:242) ``` 建议去检查一下日志上下文，看看有没有相关的error或者warn信息
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