[General][Java SDK (Component)] When using multiple registration centers, if an instance is taken offline in one of the registration centers, will the number of instances decrease accordingly?

[mmm311]

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Apache Dubbo Component

Java SDK (apache/dubbo)

Details

Currently, we have two Nacos registration centers and plan to gradually migrate from registration center A to registration center B.
To achieve this migration, we have chosen a dual-registration-center service registration scheme, where services are registered simultaneously in both registration centers A and B. We intend to gradually take instances offline from registration center A using the offline capability of the registration center. Considering the possibility of needing to rollback, we have also prepared corresponding online operations. We have deployed a multi-registration-center demo in the test environment to simulate this process. When performing online and offline operations on registration center A, we noticed that the number of invokers in the Directory did not decrease according to our monitoring.

Therefore, we would like to consult how to ensure that the offline operation of the registration center can be correctly synchronized to the service invoker.

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[AlbumenJ]

Because there are combined