Question

我编写了一个简单的Spring Cloud Ribbon应用程序，用于调用在Eureka中注册的REST服务。

但是如何覆盖ribbon.serverListRefreshInterval值？默认值是30秒，我想减少时间间隔。

提前致谢。

Answer 1

尝试：

myService.ribbon.ServerListRefreshInterval=10000

其中myService是目标微服务的名称。

<强>更新：

经过一些源代码挖掘后，我发现LoadBalancerBuilder调用了：

@Deprecated
public ZoneAwareLoadBalancer(IClientConfig clientConfig, IRule rule,
        IPing ping, ServerList<T> serverList, ServerListFilter<T> filter) {
    super(clientConfig, rule, ping, serverList, filter);
}

其超级是：

@Deprecated
public DynamicServerListLoadBalancer(IClientConfig clientConfig, IRule rule, IPing ping, 
        ServerList<T> serverList, ServerListFilter<T> filter) {
    this(
            clientConfig,
            rule,
            ping,
            serverList,
            filter,
            new PollingServerListUpdater()
    );
}

注意PollingServerListUpdater构造函数：

private static int LISTOFSERVERS_CACHE_REPEAT_INTERVAL = 30 * 1000; // msecs;

public PollingServerListUpdater() {
    this(LISTOFSERVERS_CACHE_UPDATE_DELAY, LISTOFSERVERS_CACHE_REPEAT_INTERVAL);
}

public PollingServerListUpdater(IClientConfig clientConfig) {
    this(LISTOFSERVERS_CACHE_UPDATE_DELAY, getRefreshIntervalMs(clientConfig));
}

第二个允许我们覆盖默认的刷新间隔。然而，它是第一个被调用的，所以它忽略了de property。

更新2：

这是一个未解决的问题：https://github.com/spring-cloud/spring-cloud-netflix/issues/1304

Answer 2

@codependent

在application.yml中输入以下配置后，看起来配置没有生效。

Compute-Service:   
  ribbon:  
    ServerListRefreshInterval: 1000

我发现实例列表已在Ribbon端更新（通过eureka.client.registry-fetch-interval-seconds参数），但Ribbon仍指出一个死实例：

[tbeatExecutor-0] com.netflix.discovery.DiscoveryClient    : DiscoveryClient_RIBBON-CONSUMER/192.168.1.101:Ribbon-Consumer:3333 - Heartbeat status: 200  
[freshExecutor-0] com.netflix.discovery.DiscoveryClient    : Got delta update with apps hashcode UP_2_  
[freshExecutor-0] com.netflix.discovery.DiscoveryClient    : Added instance 192.168.1.101:Ribbon-Consumer:3333 to the existing apps in region null  
[freshExecutor-0] com.netflix.discovery.DiscoveryClient    : Deleted instance 192.168.1.101:Compute-Service:2222 to the existing apps  
[freshExecutor-0] com.netflix.discovery.DiscoveryClient    : Added instance 192.168.1.101:Compute-Service:1111 to the existing apps in region null  
[freshExecutor-0] com.netflix.discovery.DiscoveryClient    : The total number of instances fetched by the delta processor : 3  
[freshExecutor-0] com.netflix.discovery.DiscoveryClient    : The total number of all instances in the client now is 2  
[freshExecutor-0] com.netflix.discovery.DiscoveryClient    : Completed cache refresh task for discovery. All Apps hash code is Local region apps hashcode: UP_2_, is fetching remote regions? false  
[nio-3333-exec-3] o.a.c.c.C.[.[.[/].[dispatcherServlet]    : Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed; nested exception is org.springframework.web.client.ResourceAccessException: I/O error on GET request for "http://Compute-Service/add": Connection refused; nested exception is java.net.ConnectException: Connection refused] with root cause

192.168.1.101:Compute-Service:1111是正确的服务实例，而192.168.1.101:Compute-Service:2222是死实例，显然Ribbon仍然指向dead实例，这意味着Ribbon ServerList缓存没有刷新。 / p>

如何覆盖Spring Cloud Ribbon中的ribbon.serverListRefreshInterval默认值？

2 个答案: