[GitHub] 356082462 opened a new issue #2545: 使用域名指向注册中心集群导致的单点问题

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356082462 opened a new issue #2545: 使用域名指向注册中心集群导致的单点问题
URL: https://github.com/apache/incubator-dubbo/issues/2545
 
 
   - [x] I have searched the [issues](https://github.com/apache/incubator-dubbo/issues) of this repository and believe that this is not a duplicate.
   - [x] I have checked the [FAQ](https://github.com/apache/incubator-dubbo/blob/master/FAQ.md) of this repository and believe that this is not a duplicate.
   
   ### Environment
   * Dubbo version: 2.6.2
   * 域名解析示例： 
   10.0.0.1 zk.foo.com
   10.0.0.2 zk.foo.com
   10.0.0.3 zk.foo.com
   10.0.0.4 zk.foo.com
   10.0.0.5 zk.foo.com
   * 注册中心：zookeeper
   
   在生产环境中要求只能使用域名，注册中心的域名解析如示例中所示，Dubbo框架在创建注册中心时，会对域名进行解析，且只取其中一个IP，这会导致每次解析获得的IP有可能不一样，有可能出现如下问题：
   1、解析获取到不一样的IP的时候，会再次创建一个注册中心实例，导致和注册中心建立多个连接。
   2、如果始终解析到的是一个IP，如果该注册中心节点不可以，zookeeper客户端也没有可重试的IP，那么会导致应用与注册中心的会话失效，导致临时服务节点被删除。
   下面是获取注册中心Key的代码:
   https://github.com/apache/incubator-dubbo/blob/e6b0bc8a856abd7f2d7a2e0f06ccc78dc90e2e0a/dubbo-registry/dubbo-registry-api/src/main/java/org/apache/dubbo/registry/support/AbstractRegistryFactory.java#L88
   就是在该方法中将域名解析成单一的IP，是否可以考虑将该实现换成不解析域名的方法：
   https://github.com/apache/incubator-dubbo/blob/7a48fac84b14ac6a21c1bdfc5958705dd8dda84d/dubbo-compatible/src/main/java/com/alibaba/dubbo/common/URL.java#L498-L500
   将域名解析的任务交给zookeeper客户端完成，zookeeper客户端默认会将域名解析成IP列表。

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