It seems like the issue you are encountering is related to the timing of service registration during the restart of your consumer service. When you restart the consumer service, the service might not have successfully registered or discovered the provider service at the time the request is made. This can result in the error No provider available for the service XXXX.

A possible cause could be that Spring Cloud or Nacos is still in the process of discovering and registering the services, which leads to the temporary unavailability of the provider when the consumer service tries to make a call. This is especially common if there’s a delay in the consumer service attempting to connect immediately after a restart.

Here are some steps you can try to mitigate the issue:

Service Dependency Delay: Introduce a delay or retry mechanism in the consumer service startup, allowing enough time for the provider services to register with Nacos before the consumer attempts to make any RPC calls.

Service Registration Check: Ensure that the Nacos registry has completely registered the provider services before the consumer starts invoking them. This can be checked by looking into the Nacos dashboard or logs.

Graceful Restart Handling: Consider using a graceful restart approach for your consumer service. This would ensure that the consumer waits until the provider services are up and available before making any requests.

Check Nacos Configuration: Ensure that your Nacos service discovery configuration is optimal and that the registration and deregistration are happening in the correct sequence.

Logging and Monitoring: Implement more detailed logging to monitor the service registration status in both the consumer and provider services during the restart process, helping you identify the root cause more effectively.

By refining these aspects, you should be able to reduce or eliminate the occurrence of these exceptions during the consumer service restart.