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-561029128
 
 
   Probably invoke a service before it is registered, or no instance found for 
it
   打印这行日志的直接原因是consumer端无法加载provider端的信息,可能的问题场景比较多:
   - provider端服务注册失败
   - sc上注册的provider服务实例数为零
   - provider的契约有问题,导致consumer加载provider契约失败
   ……
   
   通常需要结合实际运行情况以及上下文日志来判断

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