- [x] I have searched the [issues](https://github.com/apache/dubbo/issues) of this repository and believe that this is not a duplicate. - [x] I have checked the [FAQ](https://github.com/apache/dubbo/blob/master/FAQ.md) of this repository and believe that this is not a duplicate.
### Environment * Dubbo version: 2.7.3 * Operating System version:win7 * Java version: jdk 8 ### Steps to reproduce this issue 1. Create a ReferenceConfig , and do not set MetadataReportConfig 2. Use ReferenceConfigCache to cache referenceConfig 3. Get referenceConfig from ReferenceConfigCache and use it to get reference instance for call. 4. We stash referenceConfig as static field and do referenceConfig.get() in a very short time. Pls. provide [GitHub address] to reproduce this issue. ### Expected Result When the referenceConfig is first initialization successufully, the client will not do any operations which affects performance. ### Actual Result a log of log message loged by dubbo as we call ReferenceCofnig.get() ,whiche affects the health of application. ``` [DUBBO] There's no valid metadata config found, if you are using the simplified mode of registry url, please make sure you have a metadata address configured properly., dubbo version: 2.7.3-ctrip.3, current host: [DUBBO] There's no valid metadata config found, if you are using the simplified mode of registry url, please make sure you have a metadata address configured properly., dubbo version: 2.7.3-ctrip.3, current host: ``` [ Full content available at: https://github.com/apache/dubbo/issues/5225 ] This message was relayed via gitbox.apache.org for [email protected]
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