JunhuiShen created SCB-1445:
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Summary: SC heartbeat failed suggest to multiplexing old instance，
reduce sdk to update operation
Key: SCB-1445
URL: https://issues.apache.org/jira/browse/SCB-1445
Project: Apache ServiceComb
Issue Type: Improvement
Components: Service-Center
Affects Versions: service-center-1.2.0
Reporter: JunhuiShen
SC sending itself heartbeat to etcd failed，sc will register new instance and
delete old instance, the sdk will gei the event and update the date, it will
adding useless operations can lead to unpredictable problems
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