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Posted to notifications@dubbo.apache.org by "wukaixian (via GitHub)" <gi...@apache.org> on 2023/11/16 02:36:55 UTC
[I] 使用多个注册中心时，默认mapping元数据只会上报到一个注册心，如何实现元数据上报到多个注册中心？ [dubbo]
wukaixian opened a new issue, #13371:
URL: https://github.com/apache/dubbo/issues/13371
`
<dubbo:registry id="regA" address="nacos://127.0.0.1:8848?namespace=a" register-mode="instance"/>
<dubbo:registry id="regB" address="nacos://127.0.0.1?namespace=b" register-mode="instance"/>
`
如上面代码所示，服务向nacos的两个命名空间注册，服务注册可以正常注册，但元数据只会注册到其中一个命名空间，导致另一个空间订阅时，无法启用应用级服务发现（需要mapping元数据支持），请问如何实现向多个注册中心上报元数据？
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Re: [I] How to reigster metadata to multi registry [dubbo]
Posted by "wukaixian (via GitHub)" <gi...@apache.org>.
wukaixian commented on issue #13371:
URL: https://github.com/apache/dubbo/issues/13371#issuecomment-1820068510
Thanks
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Re: [I] 使用多个注册中心时，默认mapping元数据只会上报到一个注册心，如何实现元数据上报到多个注册中心？ [dubbo]
Posted by "wukaixian (via GitHub)" <gi...@apache.org>.
wukaixian commented on issue #13371:
URL: https://github.com/apache/dubbo/issues/13371#issuecomment-1813724605
[#https://github.com/apache/dubbo/blob/b74cf5be3f427867e69832e74f83d6aaa9276708/dubbo-config/dubbo-config-api/src/main/java/org/apache/dubbo/config/deploy/DefaultApplicationDeployer.java#L588-L625](https://github.com/apache/dubbo/blob/b74cf5be3f427867e69832e74f83d6aaa9276708/dubbo-config/dubbo-config-api/src/main/java/org/apache/dubbo/config/deploy/DefaultApplicationDeployer.java#L588-L625)
看了注册中心转为元数据中心的代码，多个注册中心转换配置时，只有第一个是有效的，是否有问题？
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Re: [I] How to reigster metadata to multi registry [dubbo]
Posted by "wukaixian (via GitHub)" <gi...@apache.org>.
wukaixian commented on issue #13371:
URL: https://github.com/apache/dubbo/issues/13371#issuecomment-1813929583
It seems that your configuration isn't working as expected. According to the code snippet, `String key = url.toServiceString()`; does not include namespace parameters in the key. In other words, for the same address with different namespaces, only one metadataReport will be initialized. This setup does not support metadata reporting for multiple namespaces.
This might be considered a bug as the key generated from the URL doesn't account for namespace parameters, resulting in a limitation where only one metadataReport is initialized even for different namespaces associated with the same address.
``` java
public MetadataReport getMetadataReport(URL url) {
url = url.setPath(MetadataReport.class.getName())
.removeParameters(EXPORT_KEY, REFER_KEY);
String key = url.toServiceString();
MetadataReport metadataReport = serviceStoreMap.get(key);
if (metadataReport != null) {
return metadataReport;
}
// Lock the metadata access process to ensure a single instance of the metadata instance
lock.lock();
try {
metadataReport = serviceStoreMap.get(key);
if (metadataReport != null) {
return metadataReport;
}
boolean check = url.getParameter(CHECK_KEY, true) && url.getPort() != 0;
try {
metadataReport = createMetadataReport(url);
} catch (Exception e) {
if (!check) {
logger.warn(PROXY_FAILED_EXPORT_SERVICE, "", "", "The metadata reporter failed to initialize", e);
} else {
throw e;
}
}
if (check && metadataReport == null) {
throw new IllegalStateException("Can not create metadata Report " + url);
}
if (metadataReport != null) {
serviceStoreMap.put(key, metadataReport);
}
return metadataReport;
} finally {
// Release the lock
lock.unlock();
}
}
```
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Re: [I] How to reigster metadata to multi registry [dubbo]
Posted by "AlbumenJ (via GitHub)" <gi...@apache.org>.
AlbumenJ commented on issue #13371:
URL: https://github.com/apache/dubbo/issues/13371#issuecomment-1813864216
Try use
```
<dubbo:registry id="regA" address="nacos://127.0.0.1:8848?namespace=a" register-mode="instance"/>
<dubbo:registry id="regB" address="nacos:/ /127.0.0.1?namespace=b" register-mode="instance"/>
<dubbo:metadata id="regAMeta" address="nacos://127.0.0.1:8848?namespace=a" registry="regA"/>
<dubbo:metadata id="regBMeta" address="nacos:/ /127.0.0.1?namespace=b" registry="regB"/>
```
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Re: [I] 使用多个注册中心时，默认mapping元数据只会上报到一个注册心，如何实现元数据上报到多个注册中心？ [dubbo]
Posted by "wukaixian (via GitHub)" <gi...@apache.org>.
wukaixian commented on issue #13371:
URL: https://github.com/apache/dubbo/issues/13371#issuecomment-1813698821
dubbo版本 `3.1.10`
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Re: [I] How to reigster metadata to multi registry [dubbo]
Posted by "CrazyHZM (via GitHub)" <gi...@apache.org>.
CrazyHZM closed issue #13371: How to reigster metadata to multi registry
URL: https://github.com/apache/dubbo/issues/13371
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Re: [I] How to reigster metadata to multi registry [dubbo]
Posted by "AlbumenJ (via GitHub)" <gi...@apache.org>.
AlbumenJ commented on issue #13371:
URL: https://github.com/apache/dubbo/issues/13371#issuecomment-1818103616
@chickenlj PTAL
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Re: [I] How to reigster metadata to multi registry [dubbo]
Posted by "chickenlj (via GitHub)" <gi...@apache.org>.
chickenlj commented on issue #13371:
URL: https://github.com/apache/dubbo/issues/13371#issuecomment-1818121766
> According to the code snippet, `String key = url.toServiceString()`; does not include namespace parameters in the key.
Yes, the key does not have `namespace` included. I will file a pull request to fix it.
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