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Posted to notifications@dubbo.apache.org by GitBox <gi...@apache.org> on 2021/09/08 00:31:14 UTC

[GitHub] [dubbo] startjava opened a new issue #8718: ★★★★★★我又来了！failback出现执行次数不固定的bug！！！！！！

startjava opened a new issue #8718:
URL: https://github.com/apache/dubbo/issues/8718


   说一下基本情况。
   
   服务提供者：
   ```
   public class HelloService4 implements IService4 {
       @Value("${server.port}")
       private int portValue;
   
       @Override
       public String getHello(String username) {
           System.out.println("HelloService4 portValue=" + portValue + " username=" + username);
           return "hello4 " + username + " port=" + portValue;
       }
   }
   ```
   
   服务消费者：
   ```
       @RequestMapping("Test4")
       public void test4(HttpServletRequest request, HttpServletResponse response) {
           for (int i = 0; i < 3000; i++) {
               String helloString = service4.getHello("中国人4-" + (i + 1));
               System.out.println("public String test4() " + helloString + " i=" + (i + 1));
               Thread.yield();
           }
       }
   ```
   注意：服务消费者使用failback！服务消费者使用failback！服务消费者使用failback！服务消费者使用failback！
   
   
   正常的操作过程：
   （1）启动3个服务提供者
   （2）启动1个服务消费者
   （3）执行服务消费者的Controller调用服务提供者
   （4）在服务消费者的控制台输出的结果中使用工具明确确定执行了3000次，不多不少。
   
   问题来了！
   
   （1）停止所有服务提供者进程
   （2）执行服务消费者的Controller调用服务提供者，在内部会走定时器队列，因为调用超时了。
   （3）启动1个服务提供者，这时控制台出现异常：
   [新建文本文档 (4).txt](https://github.com/apache/dubbo/files/7124919/4.txt)
   （4）查询“HelloService4 portValue=8086 username=中国人4-”字符串，查询出3002个。
   
   多出2个！！！！！！！！！！！！！！！！！！！！！！！！！！！！！！！！！！！！！！有的时候还会是2993或2997，不是多就是少，有的时候是3000，但机会很少！！！！！！！
   
   
   我猜测当服务提供者启动时出现的那几个异常导致的。
   
   这肯定是一个bug
   
   
   


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[GitHub] [dubbo] zrlw commented on issue #8718: ★★★★★★我又来了！failback出现执行次数不固定的bug！！！！！！

Posted by GitBox <gi...@apache.org>.
zrlw commented on issue #8718:
URL: https://github.com/apache/dubbo/issues/8718#issuecomment-915143358


   如果有retry，日志里会有明确提示的。前提是日志能看到有dubbo的类名记录，如果日志里看不到，要改pom文件，让应用和dubbo使用相同的日志框架。


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[GitHub] [dubbo] zrlw edited a comment on issue #8718: ★★★★★★我又来了！failback出现执行次数不固定的bug！！！！！！

Posted by GitBox <gi...@apache.org>.
zrlw edited a comment on issue #8718:
URL: https://github.com/apache/dubbo/issues/8718#issuecomment-915110488


   1. retry默认值是2，设置为0依然retry一次是个bug，看到社区已提交了pr；
   2. 通知服务消费者服务方已就绪的职责是注册中心。


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[GitHub] [dubbo] icankeep commented on issue #8718: ★★★★★★我又来了！failback出现执行次数不固定的bug！！！！！！

Posted by GitBox <gi...@apache.org>.
icankeep commented on issue #8718:
URL: https://github.com/apache/dubbo/issues/8718#issuecomment-917780845


   Fixed in #8719 


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[GitHub] [dubbo] horizonzy closed issue #8718: ★★★★★★我又来了！failback出现执行次数不固定的bug！！！！！！

Posted by GitBox <gi...@apache.org>.
horizonzy closed issue #8718:
URL: https://github.com/apache/dubbo/issues/8718


   


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[GitHub] [dubbo] icankeep edited a comment on issue #8718: ★★★★★★我又来了！failback出现执行次数不固定的bug！！！！！！

Posted by GitBox <gi...@apache.org>.
icankeep edited a comment on issue #8718:
URL: https://github.com/apache/dubbo/issues/8718#issuecomment-917780845


   solved: #8719 


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[GitHub] [dubbo] zrlw commented on issue #8718: ★★★★★★我又来了！failback出现执行次数不固定的bug！！！！！！

Posted by GitBox <gi...@apache.org>.
zrlw commented on issue #8718:
URL: https://github.com/apache/dubbo/issues/8718#issuecomment-915110488


   1. retry默认值是2；
   2. 通知服务消费者服务方已就绪的职责是注册中心。


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[GitHub] [dubbo] startjava commented on issue #8718: ★★★★★★我又来了！failback出现执行次数不固定的bug！！！！！！

Posted by GitBox <gi...@apache.org>.
startjava commented on issue #8718:
URL: https://github.com/apache/dubbo/issues/8718#issuecomment-915113795


   但问题是执行速度很快，不会有retry的机会啊
   
   
   
   
   ------------------&nbsp;原始邮件&nbsp;------------------
   发件人: ***@***.***&gt;; 
   发送时间: 2021年9月8日(星期三) 晚上6:19
   收件人: ***@***.***&gt;; 
   抄送: ***@***.***&gt;; ***@***.***&gt;; 
   主题: Re: [apache/dubbo] ★★★★★★我又来了！failback出现执行次数不固定的bug！！！！！！ (#8718)
   
   
   
   
   
     
   retry默认值是2；
    
   通知服务消费者服务方已就绪的职责是注册中心。
     
   —
   You are receiving this because you authored the thread.
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[GitHub] [dubbo] startjava commented on issue #8718: ★★★★★★我又来了！failback出现执行次数不固定的bug！！！！！！

Posted by GitBox <gi...@apache.org>.
startjava commented on issue #8718:
URL: https://github.com/apache/dubbo/issues/8718#issuecomment-914731798


   发现一个现象：
   重试的执行次数是txt中最先开始的：
   HelloService4 portValue=8086 username=中国人4-3
   HelloService4 portValue=8086 username=中国人4-6
   
   以及txt最后打印：
   HelloService4 portValue=8086 username=中国人4-6
   HelloService4 portValue=8086 username=中国人4-3
   
   这就是为什么出现3002次，所以我怀疑是不是服务提供者在启动的过程中由于内部还没有准确好，则服务消费者就认为服务提供者准确好了，开始调用，导致调用失败，进行重试，当然这只是我的猜测。
   
   还请DUBBO大佬分析一下。
   
   


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[GitHub] [dubbo] icankeep commented on issue #8718: ★★★★★★我又来了！failback出现执行次数不固定的bug！！！！！！

Posted by GitBox <gi...@apache.org>.
icankeep commented on issue #8718:
URL: https://github.com/apache/dubbo/issues/8718#issuecomment-917781314


   &READY_TO_CLOSE&


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