naming/src/main/java/com/alibaba/nacos/naming/controllers/v2/ServiceControllerV2.java [173:186]:
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    public Result<String> update(ServiceForm serviceForm) throws Exception {
        serviceForm.validate();
        Map<String, String> metadata = UtilsAndCommons.parseMetadata(serviceForm.getMetadata());
        ServiceMetadata serviceMetadata = new ServiceMetadata();
        serviceMetadata.setProtectThreshold(serviceForm.getProtectThreshold());
        serviceMetadata.setExtendData(metadata);
        serviceMetadata.setSelector(parseSelector(serviceForm.getSelector()));
        Service service = Service.newService(serviceForm.getNamespaceId(), serviceForm.getGroupName(),
                serviceForm.getServiceName());
        serviceOperatorV2.update(service, serviceMetadata);
        NotifyCenter.publishEvent(new UpdateServiceTraceEvent(System.currentTimeMillis(), serviceForm.getNamespaceId(),
                serviceForm.getGroupName(), serviceForm.getServiceName(), metadata));
        return Result.success("ok");
    }
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naming/src/main/java/com/alibaba/nacos/naming/controllers/v3/ServiceControllerV3.java [185:201]:
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    public Result<String> update(ServiceForm serviceForm) throws Exception {
        serviceForm.validate();
        Map<String, String> metadata = UtilsAndCommons.parseMetadata(serviceForm.getMetadata());
        ServiceMetadata serviceMetadata = new ServiceMetadata();
        serviceMetadata.setProtectThreshold(serviceForm.getProtectThreshold());
        serviceMetadata.setExtendData(metadata);
        serviceMetadata.setSelector(parseSelector(serviceForm.getSelector()));
        Service service = Service.newService(serviceForm.getNamespaceId(), serviceForm.getGroupName(),
                serviceForm.getServiceName());
        
        serviceOperatorV2.update(service, serviceMetadata);
        
        NotifyCenter.publishEvent(new UpdateServiceTraceEvent(System.currentTimeMillis(), serviceForm.getNamespaceId(),
                serviceForm.getGroupName(), serviceForm.getServiceName(), metadata));
        
        return Result.success("ok");
    }
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