Spring Cloud实战小贴士：turbine如何聚合设置了context-path的hystrix数据
之前在spring for all社区看到这样一个问题：当actuator端点设置了context-path之后，turbine如何聚合数据？首先，我们要知道actuator端点设置了context-path是什么意思？也就是说，此时spring boot actuator的端点都有了一个前缀，比如：
management.context-path=/xxx
如果设置了上面的参数，那个对于收集hystrix数据的端点将变为：/xxx/hystrix.stream，如果我们还是拿上一篇Spring Cloud构建微服务架构：Hystrix监控数据聚合【Dalston版】中构建你的turbine应用，那么将会看到如下错误：
INFO 7812 --- [ Timer-0] c.n.t.monitor.instance.InstanceMonitor : Url for host: http://172.15.0.18:9020/hystrix.stream default ERROR 7812 --- [InstanceMonitor] c.n.t.monitor.instance.InstanceMonitor : Could not initiate connection to host, giving up: [{"timestamp":1499941336284,"status":404,"error":"Not Found","message":"No message available","path":"/hystrix.stream"}] WARN 7812 --- [InstanceMonitor] c.n.t.monitor.instance.InstanceMonitor : Stopping InstanceMonitor for: 172.15.0.18:9020 default com.netflix.turbine.monitor.instance.InstanceMonitor$MisconfiguredHostException: [{"timestamp":1499941336284,"status":404,"error":"Not Found","message":"No message available","path":"/hystrix.stream"}] at com.netflix.turbine.monitor.instance.InstanceMonitor.init(InstanceMonitor.java:318) ~[turbine-core-1.0.0.jar:na] at com.netflix.turbine.monitor.instance.InstanceMonitor.access$100(InstanceMonitor.java:103) ~[turbine-core-1.0.0.jar:na] at com.netflix.turbine.monitor.instance.InstanceMonitor$2.call(InstanceMonitor.java:235) [turbine-core-1.0.0.jar:na] at com.netflix.turbine.monitor.instance.InstanceMonitor$2.call(InstanceMonitor.java:229) [turbine-core-1.0.0.jar:na] at java.util.concurrent.FutureTask.run(FutureTask.java:266) [na:1.8.0_91] at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) [na:1.8.0_91] at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) [na:1.8.0_91] at java.lang.Thread.run(Thread.java:745) [na:1.8.0_91] |
从上述错误中我们可以知道，turbine在收集的时候由于访问的是/hystrix.stream，而此时收集端点却是/xxx/hystrix.stream，所以报了404错误。
那么我们要如何解决呢？通过之前的配置内容，我们可能找不到相关的配置信息，所以只能遍历一下源码，最后找到这个类：org.springframework.cloud.netflix.turbine.SpringClusterMonitor。它的具体内容如下：
public static InstanceUrlClosure ClusterConfigBasedUrlClosure = new InstanceUrlClosure() { private final DynamicStringProperty defaultUrlClosureConfig = DynamicPropertyFactory .getInstance().getStringProperty("turbine.instanceUrlSuffix", "hystrix.stream"); private final DynamicBooleanProperty instanceInsertPort = DynamicPropertyFactory .getInstance().getBooleanProperty("turbine.instanceInsertPort", true); @Override public String getUrlPath(Instance host) { if (host.getCluster() == null) { throw new RuntimeException( "Host must have cluster name in order to use ClusterConfigBasedUrlClosure"); } // find url String key = "turbine.instanceUrlSuffix." + host.getCluster(); DynamicStringProperty urlClosureConfig = DynamicPropertyFactory.getInstance() .getStringProperty(key, null); String url = urlClosureConfig.get(); if (url == null) { url = this.defaultUrlClosureConfig.get(); } if (url == null) { throw new RuntimeException("Config property: " + urlClosureConfig.getName() + " or " + this.defaultUrlClosureConfig.getName() + " must be set"); } // find port and scheme String port; String scheme; if (host.getAttributes().containsKey("securePort")) { port = host.getAttributes().get("securePort"); scheme = "https"; } else { port = host.getAttributes().get("port"); scheme = "http"; } if (host.getAttributes().containsKey("fusedHostPort")) { return String.format("%s://%s/%s", scheme, host.getAttributes().get("fusedHostPort"), url); } // determine if to insert port String insertPortKey = "turbine.instanceInsertPort." + host.getCluster(); DynamicStringProperty insertPortProp = DynamicPropertyFactory.getInstance() .getStringProperty(insertPortKey, null); boolean insertPort; if (insertPortProp.get() == null) { insertPort = this.instanceInsertPort.get(); } else { insertPort = Boolean.parseBoolean(insertPortProp.get()); } // format url with port if (insertPort) { if (url.startsWith("/")) { url = url.substring(1); } if (port == null) { throw new RuntimeException( "Configured to use port, but port or securePort is not in host attributes"); } return String.format("%s://%s:%s/%s", scheme, host.getHostname(), port, url); } //format url without port return scheme + "://" + host.getHostname() + url; } }; |
从上述源码中，我们可以找到这个参数turbine.instanceUrlSuffix，由此该问题就迎刃而解了，我们只需要在turbine应用的配置文件中增加如下配置信息，就能正确的收集之前配置了management.context-path=/xxx的微服务的hystrix数据了。
turbine.instanceUrlSuffix=/xxx/hystrix.stream
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