[GitHub] [linkis] guoshupei commented on issue #4153: [Bug] Linkis gateway throw 500 Server Error

["guoshupei (via GitHub)" <gi...@apache.org>]

guoshupei commented on issue #4153:
URL: https://github.com/apache/linkis/issues/4153#issuecomment-1418844487

   The root cause is that the ribbon's ServerList is not refreshed in time
   
   First,  you can add default handling of `super.choose(serviceInstance.getApplicationName, hint)`
   
   ```
         override def choose(serviceId: String, hint: Any): client.ServiceInstance = {
           if (isMergeModuleInstance(serviceId)) {
             val serviceInstance = getServiceInstance(serviceId)
             logger.info("redirect to " + serviceInstance)
             val lb = this.getLoadBalancer(serviceInstance.getApplicationName)
             val serverOption =
               lb.getAllServers.asScala.find(_.getHostPort == serviceInstance.getInstance)
             if (serverOption.isDefined) {
               val server = serverOption.get
               new RibbonLoadBalancerClient.RibbonServer(
                 serviceId,
                 server,
                 isSecure(server, serviceId),
                 serverIntrospectorFun(serviceId).getMetadata(server)
               )
             } else {
               logger.warn("RibbonLoadBalancer not have Server, execute default super choose method" + serviceInstance)
               super.choose(serviceInstance.getApplicationName, hint)
             }
           } else super.choose(serviceId, hint)
         }
   ```
   
   Second, you can shorten the refresh time in `application-linkis.yml`, default 30s
   
   ```
   ribbon:
     ServerListRefreshInterval: 10000
       
   ```


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