com.alibaba.dubbo.config.ServiceConfig#findConfigedPorts 多次执行

[gMan1990]

log:

  2018-12-02 12:04:01,669 [main] [WARN  com.alibaba.dubbo.config.AbstractConfig] com.alibaba.dubbo.config.ServiceConfig.findConfigedPorts(ServiceConfig.java:658)
     [DUBBO] Use random available port(20880) for protocol dubbo, dubbo version: 2.6.3, current host: 172.22.227.218
  2018-12-02 12:04:02,342 [main] [INFO  com.alibaba.dubbo.remoting.transport.AbstractServer] com.alibaba.dubbo.remoting.transport.AbstractServer.<init>(AbstractServer.java:65)
     [DUBBO] Start NettyServer bind /0.0.0.0:20880, export /172.22.227.218:20880, dubbo version: 2.6.3, current host: 172.22.227.218
  2018-12-02 12:04:51,998 [main] [WARN  com.alibaba.dubbo.config.AbstractConfig] com.alibaba.dubbo.config.ServiceConfig.findConfigedPorts(ServiceConfig.java:658)
     [DUBBO] Use random available port(20880) for protocol dubbo, dubbo version: 2.6.3, current host: 172.22.227.218

打印了两行Use random available port对应项目里两个提供者。
是每个提供者可以注册到不同端口还是这个被多次调用了？

[zonghaishang]

@gMan1990 please provide a demo , I am using 2.6.3 version that cannot be reproduced

[gMan1990]

@zonghaishang 不好意思，我再展开说下：

• <dubbo:protocol name="dubbo" port="-1"
• DUBBO_PORT_TO_BIND未配置

---

以dubbo-2.6.3来说：

1. 假设写了2个Service，那么就会有2个com.alibaba.dubbo.config.spring.ServiceBean实例

@com.alibaba.dubbo.config.annotation.Service
public class Service1 ... (还有Service2)

2. 每个实例都会执行doExportUrls方法：
   https://github.com/apache/incubator-dubbo/blob/6ce7b11f982c5f7beb2ac5897fb33d48da357ada/dubbo-config/dubbo-config-api/src/main/java/com/alibaba/dubbo/config/ServiceConfig.java#L355

private void doExportUrls() {
    List<URL> registryURLs = loadRegistries(true);
    for (ProtocolConfig protocolConfig : protocols) {
        doExportUrlsFor1Protocol(protocolConfig, registryURLs);
    }
}

假设只有一个registry和protocol，那么一个实例执行一次doExportUrlsFor1Protocol

3. 然后执行到findConfigedPorts方法
   https://github.com/apache/incubator-dubbo/blob/6ce7b11f982c5f7beb2ac5897fb33d48da357ada/dubbo-config/dubbo-config-api/src/main/java/com/alibaba/dubbo/config/ServiceConfig.java#L635

• 第1个实例执行到这一行：portToBind = getRandomPort(name); 得到Integer.MIN_VALUE，然后会执行getAvailablePort和putRandomPort，然后logger.warn("Use random available port("
• 第2个实例执行到这一行：portToBind = getRandomPort(name); 得到第1个实例putRandomPort的端口，然后logger.warn("Use random available port("

---

就变成每个ServiceBean都打印一句logger.warn("Use random available port("了，重复打印

[tswstarplanet]

#2931