推荐一些springcloud+consul做分布式集群的源码

在本地启动了1个 Consul。consul agent -dev 添加了配置 ``` spring: application: name: spring-cloud-consul-ok cloud: consul: host: 127.0.0.1 port: 8500 discovery: enabled: true register: true healthCheckInterval: 15s health-check-timeout: 1s instance-id: ${spring.application.name}-${spring.cloud.consul.host}-${spring.cloud.consul.port} serviecName: ${spring.application.name} config: enabled: true format: YAML data-key: configuration ``` 属性配置类： ``` @Configuration @ConfigurationProperties("sample") @Data @RefreshScope public class SampleProperties { private String prop = "default data"; } ``` 引用方式： ``` @SpringBootApplication @EnableDiscoveryClient @EnableHystrix @RestController @EnableConfigurationProperties @EnableFeignClients @Slf4j public class ConsulAreYouOkApplication { @Autowired private RibbonHelloService ribbonHelloService; @Autowired private SampleProperties sampleProperties; @RequestMapping(value = "/hello", method = RequestMethod.GET) public String areyouok(@RequestParam String name) { return ribbonHelloService.sayHi(name)+" "+sampleProperties.getProp(); } ``` 看着没什么错，但是一直 拿不到 Consul上面的配置，从日志里面 也可以看到Spring已经检测到了 属性的变化，但是就是一直获取不到新值。 版本如下 spring-boot-dependencies 1.5.10.RELEASE spring-cloud-consul-config 1.3.2.RELEASE spring-cloud-starter-consul-discovery 1.3.2.RELEASE

请教一个Consul的问题，代码见图，服务注册是可以成功的，不知道为什么解除注册报了连接错误 ConsulClient consulClient = new ConsulClient(nodeHostAdress); Iterator<Map.Entry<String, Service>> it_service = consulClient.getAgentServices().getValue().entrySet().iterator(); java.net.ConnectException: Connection refused (Connection refused) 

在很多博客上看到一些关于consul的介绍以及注册实例，但是几乎没有服务的使用实例， 有介绍说使用Feign进行调用，后面试用轮询的方式，那么如果多个请求同时到达， 轮询的第一个服务会不会压力过大？想了解下关于consul到底是怎样实现负载均衡的，拜托了！

我两台电脑启动consul，并加到同一个集群中，出现以下错误： 2019/12/19 16:12:35 [ERR] memberlist: Push/Pull with n2.dc1 failed: Encrypti on is configured but remote state is not encrypted。 有谁遇到同样的问题没有，麻烦提供下解决方案，谢谢！

如果dev环境consul的配置如下 ``` spring: cloud: consul: host: localhost port: 8500 discovery: hostname: ${spring.cloud.client.ip-address} healthCheckPath: /actuator/health healthCheckInterval: 15s #默认是10s 可设置ps：15s or 1m ip-address: true instanceId: ${spring.application.name}:${spring.cloud.client.ipaddress}:${server.port} tags: ${spring.profiles.active} config: prefix: config enabled: true #默认是true -- format: YAML # 表示consul上面文件的格式 有四种 YAML PROPERTIES KEY-VALUE FILES defaultContext: demo-server # 表示配置文件对应的应用名称 data-key: data #表示consul上面的KEY值(或者说文件的名字) 默认是data profileSeparator: '-' ``` 那么请问在pre环境下。（服务器地址120.78.8.111） cunsul的配置，尤其是host应该怎么配？

**** consul agent -dev 模式下  搭建了 几个微服务，注册到consul （V1.4.3）上 现在几个微服务重启后，在consul的健康页面上查看几个微服务状态很奇怪 使用zuul进行转发访问都是找不到service-id 通过请求 http://localhost:19003/actuator/health 查看，服务状态都是down的，想问下是怎么回事？  注：第一次从头再来，都是正常up的，只要一重启某个服务，就某个服务异常了。 下面为配置： ## admin-service  ## gateway-service  请求：localhost:19002/admin/getTest ****


<div class="post-text" itemprop="text"> <p>I have a Go service which is pluggable and based on the plugin serve different purposes. At the start it's register the address and port into the Consul's service discovery and it's tags like <code>plugin1</code>, <code>plugin2</code>, <code>plugin3</code>, etc. </p> <p>On the client-side I want to connect to the services based on the plugin what it implements. I can get them from consul, call the <code>grpc.Dial</code> and pass it to the proto's client implementation. When I call the right endpoint I just close the connection and go on. </p> <p>The problem with this, the <code>grpc.Dial</code> can be a reusable connection, so not necessary to call it anytime when I want to connect to a service, but it's too dynamic to have a persistent connection to the services, because services could be removed or new services can appear. </p> <p>What is the best way to have persistent connection to the services based on this requirements/problems?</p> </div>

现在用的是这两个go-micro consul 有一个加减用户积分的微服务 <用户微服务> 加减积分在服务中直接进行 很多服务现在 依赖 用户微服务 ,现在怎么更新,重启而不影响其他服务呢 如果启动两个用户实例, 两个实例之间的用户积分怎么同步呢 请问,你们都是怎么处理的呢

<div class="post-text" itemprop="text"> <p>I try to start a Consul agent using their Golang <a href="http://github.com/hashicorp/consul/command/agent" rel="nofollow">package</a>. The server itself comes up but I can't interact with it because it does not start to listen for incoming HTTP requests.</p> <p>My code to start the agent:</p> <pre><code>//create the logwriter writer := bytes.NewBuffer(server.log) agentConfig := agent.DefaultConfig() agentConfig.BindAddr = "127.0.0.1" agentConfig.DevMode = true agentConfig.Bootstrap = true agentConfig.Server = true agentConfig.DataDir = "/tmp" agentConfig.Ports.HTTP = 8500 agentConfig.Ports.HTTPS = -1 //agentConfig.AdvertiseAddr = "127.0.0.1" //agentConfig.EnableUi = true agentConfig.Addresses.HTTP = "127.0.0.1" glog.Infof("Agent config: %+v", agentConfig) agent, err := agent.Create(agentConfig, writer) if err != nil { t.Fatalf("Error starting consul agent: %v", err) } </code></pre> <p>The resulting configuration on start looks like:</p> <pre><code>Agent config: &amp;{DevMode:true Bootstrap:true BootstrapExpect:0 Server:true Datacenter:dc1 DataDir:/tmp DNSRecursor: DNSRecursors:[] DNSConfig:{NodeTTL:0 NodeTTLRaw: ServiceTTL:map[] ServiceTTLRaw:map[] AllowStale:false EnableTruncate:false UDPAnswerLimit:3 MaxStale:5s MaxStaleRaw: OnlyPassing:false} Domain:consul. EncryptKey: LogLevel:INFO NodeName: ClientAddr:127.0.0.1 BindAddr:127.0.0.1 AdvertiseAddr: AdvertiseAddrs:{SerfLan:&lt;nil&gt; SerfLanRaw: SerfWan:&lt;nil&gt; SerfWanRaw: RPC:&lt;nil&gt; RPCRaw:} AdvertiseAddrWan: TranslateWanAddrs:false Ports:{DNS:8600 HTTP:8500 HTTPS:-1 RPC:8400 SerfLan:8301 SerfWan:8302 Server:8300} Addresses:{DNS: HTTP:127.0.0.1 HTTPS: RPC:} TaggedAddresses:map[] LeaveOnTerm:false SkipLeaveOnInt: &lt;nil&gt; Telemetry:{StatsiteAddr: StatsdAddr: StatsitePrefix:consul DisableHostname:false DogStatsdAddr: DogStatsdTags:[]} Protocol:2 EnableDebug:false VerifyIncoming:false VerifyOutgoing:false VerifyServerHostname:false CAFile: CertFile: KeyFile: ServerName: StartJoin:[] StartJoinWan:[] RetryJoin:[] RetryMaxAttempts:0 RetryInterval:30s RetryIntervalRaw: RetryJoinWan:[] RetryMaxAttemptsWan:0 RetryIntervalWan:30s RetryIntervalWanRaw: ReconnectTimeoutLan:0 ReconnectTimeoutLanRaw: ReconnectTimeoutWan:0 ReconnectTimeoutWanRaw: EnableUi:false UiDir: PidFile: EnableSyslog:false SyslogFacility:LOCAL0 RejoinAfterLeave:false CheckUpdateInterval:5m0s CheckUpdateIntervalRaw: ACLToken: ACLMasterToken: ACLDatacenter: ACLTTL:30s ACLTTLRaw: ACLDefaultPolicy:allow ACLDownPolicy:extend-cache Watches:[] DisableRemoteExec:false DisableUpdateCheck:false DisableAnonymousSignature:false HTTPAPIResponseHeaders:map[] AtlasInfrastructure: AtlasToken: AtlasACLToken: AtlasJoin:false AtlasEndpoint: AEInterval:1m0s DisableCoordinates:false SyncCoordinateRateTarget:64 SyncCoordinateIntervalMin:15s Checks:[] Services:[] ConsulConfig:&lt;nil&gt; Revision: Version: VersionPrerelease: WatchPlans:[] UnixSockets:{UnixSocketPermissions:{Usr: Grp: Perms:}} SessionTTLMin:0 SessionTTLMinRaw: Reap:&lt;nil&gt;} </code></pre> <p>Checking my open ports I can see that the agent is up but not listening for HTTP</p> <pre><code>storage.t 16820 felix 5u IPv4 469866 0t0 TCP localhost:8300 (LISTEN) storage.t 16820 felix 6u IPv4 469867 0t0 TCP localhost:8301 (LISTEN) storage.t 16820 felix 7u IPv4 469868 0t0 UDP localhost:8301 storage.t 16820 felix 8u IPv4 469869 0t0 TCP localhost:8302 (LISTEN) storage.t 16820 felix 9u IPv4 469870 0t0 UDP localhost:8302 </code></pre> <p>Every tip to get that running is appreciated :)</p> </div>

<div class="post-text" itemprop="text"> <p>We are running consul through docker and using the HTTP health checks to a URL (<a href="https://10.1.24.68:5012/status" rel="nofollow">https://10.1.24.68:5012/status</a>) with a self-signed certificate. However, I get the following error:</p> <blockquote> <p>2016/06/10 10:29:42 [WARN] agent: http request failed '<a href="https://10.1.24.68:5012/status" rel="nofollow">https://10.1.24.68:5012/status</a>': Get <a href="https://10.1.24.68:5012/status" rel="nofollow">https://10.1.24.68:5012/status</a>: read tcp 10.3.2.11:55549-&gt;10.1.24.68:5012: read: connection reset by peer</p> </blockquote> <p>It works as well when we use the Script health check with the <code>wget</code> command but this is not ideal. <a href="https://github.com/hashicorp/consul/blob/14ec46b3cf8edf6fdd3f4bda8deacdfb6d4e9a73/command/agent/check.go#L426" rel="nofollow">This</a> is the line of code in Consul throwing the above error.</p> <p>When running the health check to a HTTP URL (<a href="http://localhost:5012/status" rel="nofollow">http://localhost:5012/status</a>) it works. Could this be a certificate issue? I've added our certificate to both <code>/etc/ssl/certs/ca-certificates.crt</code> and <code>/usr/share/local/ca-certificates.crt</code>.</p> <p>Halp!</p> </div>

最近使用consul作为spring cloud的服务发现，一直不能把服务注册到consul上，发生spring boot使用的是2.1.1.RELEASE版本，后来改成2.0.3.RELEASE能够注册成功。 spring cloud使用Finchley.RELEASE或者Finchley.SR2没有影响。 分别使用consul1.2.1,1.3.1,1.4测试了，结果一样。 哪位同学知道为什么？

之前用的zookeeper+leveldb的集群，三台机器，随机关闭一台机器重启不能正常恢复服务，集群直接就崩了，报的No IOExceptionHandler registered，后来查的说现在apache已经弃用leveldb的了 所以现在高可用都是什么配置策略呢？大家给些指导吧


spring cloud spring boot 中使用zuul+consul, zuul路由不到配置了context-path的客户端，不配置context-path可以路由。 网关配置：  被调用服务配置：  网关调用报错：

<div class="post-text" itemprop="text"> <p>Does anyone know how to concatenate strings from consul for consul-template? </p> <p>If I have a service 'foo' registered in Consul</p> <pre><code>{ "Node": "node1", "Address": "192.168.0.1", "Port": 3333 }, { "Node": "node2", "Address": "192.168.0.2", "Port": 4444 } </code></pre> <p>I would like consul-template to generate the following line:</p> <pre><code>servers=192.168.0.1:3333,192.168.0.2:4444/bogus </code></pre> <p>The following attempt does not work since it leaves a trailing comma <code>,</code></p> <pre><code>servers={{range service "foo"}}{{.Address}}{{.Port}},{{end}}/bogus # renders servers=192.168.0.1:3333,192.168.0.2:4444,/bogus # What I actually want servers=192.168.0.1:3333,192.168.0.2:4444/bogus </code></pre> <p>I know consul-template uses golang template syntax, but I simply cannot figure out the syntax to get this working. Its likely that I should use consul-template's <code>join</code> but how do I pass both <code>.Address</code> and <code>.Port</code> to <code>join</code>? This is just a trivial example, and I'm not using indexes intentionally since the number of services could be more than two. Any ideas?</p> </div>

直接上错误信息：其中svms-file-8585时我的另一个服务id ``` Registering service with consul: NewService{id='svms-file-8585', name='svms-file', tags=[serverType=2, secure=false], address='172.16.128.95', meta=null, port=8585, enableTagOverride=null, check=Check{script='null', interval='10s', ttl='null', http='http://172.16.128.95:8585/health', method='null', header={}, tcp='null', timeout='null', deregisterCriticalServiceAfter='null', tlsSkipVerify=null, status='null'}, checks=null} ``` ------------------------------------------------------------ ``` com.netflix.zuul.exception.ZuulException: Forwarding error at org.springframework.cloud.netflix.zuul.filters.route.RibbonRoutingFilter.handleException(RibbonRoutingFilter.java:198) ~[spring-cloud-netflix-zuul-2.1.1.RELEASE.jar:2.1.1.RELEASE] at org.springframework.cloud.netflix.zuul.filters.route.RibbonRoutingFilter.forward(RibbonRoutingFilter.java:173) ~[spring-cloud-netflix-zuul-2.1.1.RELEASE.jar:2.1.1.RELEASE] at org.springframework.cloud.netflix.zuul.filters.route.RibbonRoutingFilter.run(RibbonRoutingFilter.java:119) ~[spring-cloud-netflix-zuul-2.1.1.RELEASE.jar:2.1.1.RELEASE] at com.netflix.zuul.ZuulFilter.runFilter(ZuulFilter.java:117) ~[zuul-core-1.3.1.jar:1.3.1] at com.netflix.zuul.FilterProcessor.processZuulFilter(FilterProcessor.java:193) ~[zuul-core-1.3.1.jar:1.3.1] at com.netflix.zuul.FilterProcessor.runFilters(FilterProcessor.java:157) ~[zuul-core-1.3.1.jar:1.3.1] at com.netflix.zuul.FilterProcessor.route(FilterProcessor.java:118) ~[zuul-core-1.3.1.jar:1.3.1] at com.netflix.zuul.ZuulRunner.route(ZuulRunner.java:96) ~[zuul-core-1.3.1.jar:1.3.1] at com.netflix.zuul.http.ZuulServlet.route(ZuulServlet.java:116) ~[zuul-core-1.3.1.jar:1.3.1] at com.netflix.zuul.http.ZuulServlet.service(ZuulServlet.java:81) ~[zuul-core-1.3.1.jar:1.3.1] at org.springframework.web.servlet.mvc.ServletWrappingController.handleRequestInternal(ServletWrappingController.java:165) [spring-webmvc-5.1.5.RELEASE.jar:5.1.5.RELEASE] at org.springframework.cloud.netflix.zuul.web.ZuulController.handleRequest(ZuulController.java:45) [spring-cloud-netflix-zuul-2.1.1.RELEASE.jar:2.1.1.RELEASE] at org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter.handle(SimpleControllerHandlerAdapter.java:52) [spring-webmvc-5.1.5.RELEASE.jar:5.1.5.RELEASE] at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1038) [spring-webmvc-5.1.5.RELEASE.jar:5.1.5.RELEASE] at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:942) [spring-webmvc-5.1.5.RELEASE.jar:5.1.5.RELEASE] at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1005) [spring-webmvc-5.1.5.RELEASE.jar:5.1.5.RELEASE] at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:897) [spring-webmvc-5.1.5.RELEASE.jar:5.1.5.RELEASE] at javax.servlet.http.HttpServlet.service(HttpServlet.java:634) [tomcat-embed-core-9.0.16.jar:9.0.16] at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:882) [spring-webmvc-5.1.5.RELEASE.jar:5.1.5.RELEASE] at javax.servlet.http.HttpServlet.service(HttpServlet.java:741) [tomcat-embed-core-9.0.16.jar:9.0.16] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231) [tomcat-embed-core-9.0.16.jar:9.0.16] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) [tomcat-embed-core-9.0.16.jar:9.0.16] at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53) [tomcat-embed-websocket-9.0.16.jar:9.0.16] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) [tomcat-embed-core-9.0.16.jar:9.0.16] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) [tomcat-embed-core-9.0.16.jar:9.0.16] at org.springframework.boot.actuate.web.trace.servlet.HttpTraceFilter.doFilterInternal(HttpTraceFilter.java:90) [spring-boot-actuator-2.1.3.RELEASE.jar:2.1.3.RELEASE] at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) [spring-web-5.1.5.RELEASE.jar:5.1.5.RELEASE] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) [tomcat-embed-core-9.0.16.jar:9.0.16] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) [tomcat-embed-core-9.0.16.jar:9.0.16] at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:99) [spring-web-5.1.5.RELEASE.jar:5.1.5.RELEASE] at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) [spring-web-5.1.5.RELEASE.jar:5.1.5.RELEASE] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) [tomcat-embed-core-9.0.16.jar:9.0.16] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) [tomcat-embed-core-9.0.16.jar:9.0.16] at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:92) [spring-web-5.1.5.RELEASE.jar:5.1.5.RELEASE] at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) [spring-web-5.1.5.RELEASE.jar:5.1.5.RELEASE] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) [tomcat-embed-core-9.0.16.jar:9.0.16] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) [tomcat-embed-core-9.0.16.jar:9.0.16] at org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:93) [spring-web-5.1.5.RELEASE.jar:5.1.5.RELEASE] at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) [spring-web-5.1.5.RELEASE.jar:5.1.5.RELEASE] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) [tomcat-embed-core-9.0.16.jar:9.0.16] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) [tomcat-embed-core-9.0.16.jar:9.0.16] at org.springframework.boot.actuate.metrics.web.servlet.WebMvcMetricsFilter.filterAndRecordMetrics(WebMvcMetricsFilter.java:117) [spring-boot-actuator-2.1.3.RELEASE.jar:2.1.3.RELEASE] at org.springframework.boot.actuate.metrics.web.servlet.WebMvcMetricsFilter.doFilterInternal(WebMvcMetricsFilter.java:106) [spring-boot-actuator-2.1.3.RELEASE.jar:2.1.3.RELEASE] at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) [spring-web-5.1.5.RELEASE.jar:5.1.5.RELEASE] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) [tomcat-embed-core-9.0.16.jar:9.0.16] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) [tomcat-embed-core-9.0.16.jar:9.0.16] at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:200) [spring-web-5.1.5.RELEASE.jar:5.1.5.RELEASE] at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) [spring-web-5.1.5.RELEASE.jar:5.1.5.RELEASE] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) [tomcat-embed-core-9.0.16.jar:9.0.16] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) [tomcat-embed-core-9.0.16.jar:9.0.16] at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:200) [tomcat-embed-core-9.0.16.jar:9.0.16] at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96) [tomcat-embed-core-9.0.16.jar:9.0.16] at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:490) [tomcat-embed-core-9.0.16.jar:9.0.16] at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:139) [tomcat-embed-core-9.0.16.jar:9.0.16] at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92) [tomcat-embed-core-9.0.16.jar:9.0.16] at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74) [tomcat-embed-core-9.0.16.jar:9.0.16] at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343) [tomcat-embed-core-9.0.16.jar:9.0.16] at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:408) [tomcat-embed-core-9.0.16.jar:9.0.16] at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66) [tomcat-embed-core-9.0.16.jar:9.0.16] at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:834) [tomcat-embed-core-9.0.16.jar:9.0.16] at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1415) [tomcat-embed-core-9.0.16.jar:9.0.16] at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) [tomcat-embed-core-9.0.16.jar:9.0.16] at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) [na:1.8.0_161] at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) [na:1.8.0_161] at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) [tomcat-embed-core-9.0.16.jar:9.0.16] at java.lang.Thread.run(Thread.java:748) [na:1.8.0_161] Caused by: com.netflix.client.ClientException: Load balancer does not have available server for client: svms-file-8585 at com.netflix.loadbalancer.LoadBalancerContext.getServerFromLoadBalancer(LoadBalancerContext.java:483) ~[ribbon-loadbalancer-2.3.0.jar:2.3.0] at com.netflix.loadbalancer.reactive.LoadBalancerCommand$1.call(LoadBalancerCommand.java:184) ~[ribbon-loadbalancer-2.3.0.jar:2.3.0] at com.netflix.loadbalancer.reactive.LoadBalancerCommand$1.call(LoadBalancerCommand.java:180) ~[ribbon-loadbalancer-2.3.0.jar:2.3.0] at rx.Observable.unsafeSubscribe(Observable.java:10327) ~[rxjava-1.3.8.jar:1.3.8] at rx.internal.operators.OnSubscribeConcatMap.call(OnSubscribeConcatMap.java:94) ~[rxjava-1.3.8.jar:1.3.8] at rx.internal.operators.OnSubscribeConcatMap.call(OnSubscribeConcatMap.java:42) ~[rxjava-1.3.8.jar:1.3.8] at rx.Observable.unsafeSubscribe(Observable.java:10327) ~[rxjava-1.3.8.jar:1.3.8] at rx.internal.operators.OperatorRetryWithPredicate$SourceSubscriber$1.call(OperatorRetryWithPredicate.java:127) ~[rxjava-1.3.8.jar:1.3.8] at rx.internal.schedulers.TrampolineScheduler$InnerCurrentThreadScheduler.enqueue(TrampolineScheduler.java:73) ~[rxjava-1.3.8.jar:1.3.8] at rx.internal.schedulers.TrampolineScheduler$InnerCurrentThreadScheduler.schedule(TrampolineScheduler.java:52) ~[rxjava-1.3.8.jar:1.3.8] at rx.internal.operators.OperatorRetryWithPredicate$SourceSubscriber.onNext(OperatorRetryWithPredicate.java:79) ~[rxjava-1.3.8.jar:1.3.8] at rx.internal.operators.OperatorRetryWithPredicate$SourceSubscriber.onNext(OperatorRetryWithPredicate.java:45) ~[rxjava-1.3.8.jar:1.3.8] at rx.internal.util.ScalarSynchronousObservable$WeakSingleProducer.request(ScalarSynchronousObservable.java:276) ~[rxjava-1.3.8.jar:1.3.8] at rx.Subscriber.setProducer(Subscriber.java:209) ~[rxjava-1.3.8.jar:1.3.8] at rx.internal.util.ScalarSynchronousObservable$JustOnSubscribe.call(ScalarSynchronousObservable.java:138) ~[rxjava-1.3.8.jar:1.3.8] at rx.internal.util.ScalarSynchronousObservable$JustOnSubscribe.call(ScalarSynchronousObservable.java:129) ~[rxjava-1.3.8.jar:1.3.8] at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:48) ~[rxjava-1.3.8.jar:1.3.8] at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:30) ~[rxjava-1.3.8.jar:1.3.8] at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:48) ~[rxjava-1.3.8.jar:1.3.8] at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:30) ~[rxjava-1.3.8.jar:1.3.8] at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:48) ~[rxjava-1.3.8.jar:1.3.8] at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:30) ~[rxjava-1.3.8.jar:1.3.8] at rx.Observable.subscribe(Observable.java:10423) ~[rxjava-1.3.8.jar:1.3.8] at rx.Observable.subscribe(Observable.java:10390) ~[rxjava-1.3.8.jar:1.3.8] at rx.observables.BlockingObservable.blockForSingle(BlockingObservable.java:443) ~[rxjava-1.3.8.jar:1.3.8] at rx.observables.BlockingObservable.single(BlockingObservable.java:340) ~[rxjava-1.3.8.jar:1.3.8] at com.netflix.client.AbstractLoadBalancerAwareClient.executeWithLoadBalancer(AbstractLoadBalancerAwareClient.java:112) ~[ribbon-loadbalancer-2.3.0.jar:2.3.0] at org.springframework.cloud.netflix.zuul.filters.route.support.AbstractRibbonCommand.run(AbstractRibbonCommand.java:221) ~[spring-cloud-netflix-zuul-2.1.1.RELEASE.jar:2.1.1.RELEASE] at org.springframework.cloud.netflix.zuul.filters.route.support.AbstractRibbonCommand.run(AbstractRibbonCommand.java:55) ~[spring-cloud-netflix-zuul-2.1.1.RELEASE.jar:2.1.1.RELEASE] at com.netflix.hystrix.HystrixCommand$2.call(HystrixCommand.java:302) ~[hystrix-core-1.5.18.jar:1.5.18] at com.netflix.hystrix.HystrixCommand$2.call(HystrixCommand.java:298) ~[hystrix-core-1.5.18.jar:1.5.18] at rx.internal.operators.OnSubscribeDefer.call(OnSubscribeDefer.java:46) ~[rxjava-1.3.8.jar:1.3.8] at rx.internal.operators.OnSubscribeDefer.call(OnSubscribeDefer.java:35) ~[rxjava-1.3.8.jar:1.3.8] at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:48) ~[rxjava-1.3.8.jar:1.3.8] at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:30) ~[rxjava-1.3.8.jar:1.3.8] at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:48) ~[rxjava-1.3.8.jar:1.3.8] at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:30) ~[rxjava-1.3.8.jar:1.3.8] at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:48) ~[rxjava-1.3.8.jar:1.3.8] at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:30) ~[rxjava-1.3.8.jar:1.3.8] at rx.Observable.unsafeSubscribe(Observable.java:10327) ~[rxjava-1.3.8.jar:1.3.8] at rx.internal.operators.OnSubscribeDefer.call(OnSubscribeDefer.java:51) ~[rxjava-1.3.8.jar:1.3.8] at rx.internal.operators.OnSubscribeDefer.call(OnSubscribeDefer.java:35) ~[rxjava-1.3.8.jar:1.3.8] at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:48) ~[rxjava-1.3.8.jar:1.3.8] at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:30) ~[rxjava-1.3.8.jar:1.3.8] at rx.Observable.unsafeSubscribe(Observable.java:10327) ~[rxjava-1.3.8.jar:1.3.8] at rx.internal.operators.OnSubscribeDoOnEach.call(OnSubscribeDoOnEach.java:41) ~[rxjava-1.3.8.jar:1.3.8] at rx.internal.operators.OnSubscribeDoOnEach.call(OnSubscribeDoOnEach.java:30) ~[rxjava-1.3.8.jar:1.3.8] at rx.Observable.unsafeSubscribe(Observable.java:10327) ~[rxjava-1.3.8.jar:1.3.8] at rx.internal.operators.OnSubscribeDoOnEach.call(OnSubscribeDoOnEach.java:41) ~[rxjava-1.3.8.jar:1.3.8] at rx.internal.operators.OnSubscribeDoOnEach.call(OnSubscribeDoOnEach.java:30) ~[rxjava-1.3.8.jar:1.3.8] at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:48) ~[rxjava-1.3.8.jar:1.3.8] at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:30) ~[rxjava-1.3.8.jar:1.3.8] at rx.Observable.unsafeSubscribe(Observable.java:10327) ~[rxjava-1.3.8.jar:1.3.8] at rx.internal.operators.OnSubscribeDoOnEach.call(OnSubscribeDoOnEach.java:41) ~[rxjava-1.3.8.jar:1.3.8] at rx.internal.operators.OnSubscribeDoOnEach.call(OnSubscribeDoOnEach.java:30) ~[rxjava-1.3.8.jar:1.3.8] at rx.Observable.unsafeSubscribe(Observable.java:10327) ~[rxjava-1.3.8.jar:1.3.8] at rx.internal.operators.OnSubscribeDoOnEach.call(OnSubscribeDoOnEach.java:41) ~[rxjava-1.3.8.jar:1.3.8] at rx.internal.operators.OnSubscribeDoOnEach.call(OnSubscribeDoOnEach.java:30) ~[rxjava-1.3.8.jar:1.3.8] at rx.Observable.unsafeSubscribe(Observable.java:10327) ~[rxjava-1.3.8.jar:1.3.8] at rx.internal.operators.OnSubscribeDoOnEach.call(OnSubscribeDoOnEach.java:41) ~[rxjava-1.3.8.jar:1.3.8] at rx.internal.operators.OnSubscribeDoOnEach.call(OnSubscribeDoOnEach.java:30) ~[rxjava-1.3.8.jar:1.3.8] at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:48) ~[rxjava-1.3.8.jar:1.3.8] at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:30) ~[rxjava-1.3.8.jar:1.3.8] at rx.Observable.unsafeSubscribe(Observable.java:10327) ~[rxjava-1.3.8.jar:1.3.8] at rx.internal.operators.OnSubscribeDefer.call(OnSubscribeDefer.java:51) ~[rxjava-1.3.8.jar:1.3.8] at rx.internal.operators.OnSubscribeDefer.call(OnSubscribeDefer.java:35) ~[rxjava-1.3.8.jar:1.3.8] at rx.Observable.unsafeSubscribe(Observable.java:10327) ~[rxjava-1.3.8.jar:1.3.8] at rx.internal.operators.OnSubscribeMap.call(OnSubscribeMap.java:48) ~[rxjava-1.3.8.jar:1.3.8] at rx.internal.operators.OnSubscribeMap.call(OnSubscribeMap.java:33) ~[rxjava-1.3.8.jar:1.3.8] at rx.Observable.unsafeSubscribe(Observable.java:10327) ~[rxjava-1.3.8.jar:1.3.8] at rx.internal.operators.OnSubscribeDoOnEach.call(OnSubscribeDoOnEach.java:41) ~[rxjava-1.3.8.jar:1.3.8] at rx.internal.operators.OnSubscribeDoOnEach.call(OnSubscribeDoOnEach.java:30) ~[rxjava-1.3.8.jar:1.3.8] at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:48) ~[rxjava-1.3.8.jar:1.3.8] at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:30) ~[rxjava-1.3.8.jar:1.3.8] at rx.Observable.unsafeSubscribe(Observable.java:10327) ~[rxjava-1.3.8.jar:1.3.8] at rx.internal.operators.OnSubscribeDoOnEach.call(OnSubscribeDoOnEach.java:41) ~[rxjava-1.3.8.jar:1.3.8] at rx.internal.operators.OnSubscribeDoOnEach.call(OnSubscribeDoOnEach.java:30) ~[rxjava-1.3.8.jar:1.3.8] at rx.Observable.unsafeSubscribe(Observable.java:10327) ~[rxjava-1.3.8.jar:1.3.8] at rx.internal.operators.OnSubscribeDefer.call(OnSubscribeDefer.java:51) ~[rxjava-1.3.8.jar:1.3.8] at rx.internal.operators.OnSubscribeDefer.call(OnSubscribeDefer.java:35) ~[rxjava-1.3.8.jar:1.3.8] at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:48) ~[rxjava-1.3.8.jar:1.3.8] at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:30) ~[rxjava-1.3.8.jar:1.3.8] at rx.Observable.subscribe(Observable.java:10423) ~[rxjava-1.3.8.jar:1.3.8] at rx.Observable.subscribe(Observable.java:10390) ~[rxjava-1.3.8.jar:1.3.8] at rx.internal.operators.BlockingOperatorToFuture.toFuture(BlockingOperatorToFuture.java:51) ~[rxjava-1.3.8.jar:1.3.8] at rx.observables.BlockingObservable.toFuture(BlockingObservable.java:410) ~[rxjava-1.3.8.jar:1.3.8] at com.netflix.hystrix.HystrixCommand.queue(HystrixCommand.java:378) ~[hystrix-core-1.5.18.jar:1.5.18] at com.netflix.hystrix.HystrixCommand.execute(HystrixCommand.java:344) ~[hystrix-core-1.5.18.jar:1.5.18] at org.springframework.cloud.netflix.zuul.filters.route.RibbonRoutingFilter.forward(RibbonRoutingFilter.java:167) ~[spring-cloud-netflix-zuul-2.1.1.RELEASE.jar:2.1.1.RELEASE] ... 64 common frames omitted ```

<div class="post-text" itemprop="text"> <p>I'm using consul as a coordinator, and I coordinate completion of DAG branches using consul. Here each branches use a separate process. And to make the completion synchronised I use consul's counter and update with modifyIndex. </p> <p>Although it seems there is some hole in the current implementation of code and the value is same for separate branches after increment. </p> <p>The consul update is implemented as </p> <pre class="lang-golang prettyprint-override"><code>func (consulStore *ConsulStateStore) Update(key string, oldValue string, newValue string) error { key = consulStore.consulKeyPath + "/" + key pair, _, err := consulStore.kv.Get(key, nil) if err != nil { return fmt.Errorf("failed to get key %s, error %v", key, err) } if pair == nil { return fmt.Errorf("failed to get key %s", key) } if string(pair.Value) != oldValue { return fmt.Errorf("Old value doesn't match for key %s", key) } modifyIndex := pair.ModifyIndex p := &amp;consul.KVPair{Key: key, Value: []byte(newValue), ModifyIndex: modifyIndex} _, err = consulStore.kv.Put(p, nil) if err != nil { return fmt.Errorf("failed to update key %s, error %v", key, err) } return nil } </code></pre> <p>My branch execution process calls the below function to increment a counter</p> <pre class="lang-golang prettyprint-override"><code>// IncrementCounter increment counter by given term, if doesn't exist init with incrementby func (fhandler *flowHandler) IncrementCounter(counter string, incrementby int) (int, error) { var serr error count := 0 for i := 0; i &lt; counterUpdateRetryCount; i++ { encoded, err := fhandler.stateStore.Get(counter) if err != nil { // if doesn't exist try to create err := fhandler.stateStore.Set(counter, fmt.Sprintf("%d", incrementby)) if err != nil { return 0, fmt.Errorf("failed to update counter %s, error %v", counter, err) } return incrementby, nil } current, err := strconv.Atoi(encoded) if err != nil { return 0, fmt.Errorf("failed to update counter %s, error %v", counter, err) } count = current + incrementby counterStr := fmt.Sprintf("%d", count) err = fhandler.stateStore.Update(counter, encoded, counterStr) if err == nil { return count, nil } serr = err } return 0, fmt.Errorf("failed to update counter after max retry for %s, error %v", counter, serr) } </code></pre> <p>In the runtime the counter is always initialised before increment</p> </div>

在spring Cloud 中，用consul 搭建了两个服务做集群，用feign进行访问，但是一直访问第一台，负载均衡失效，关闭第一台，就能访问到第二台，这时候，开启第一台，后面调用，就不会访问到第一台，只访问第二台.

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有小伙伴问松哥这个问题，他在上海某公司，在离职了几个月后，前公司的领导联系到他，希望他能够返聘回去，他很纠结要不要回去？ 俗话说好马不吃回头草，但是这个小伙伴既然感到纠结了，我觉得至少说明了两个问题：1.曾经的公司还不错；2.现在的日子也不是很如意。否则应该就不会纠结了。 老实说，松哥之前也有过类似的经历，今天就来和小伙伴们聊聊回头草到底吃不吃。 首先一个基本观点，就是离职了也没必要和老东家弄的苦...

阿里巴巴全球数学竞赛（ Alibaba Global Mathematics Competition）由马云发起，由中国科学技术协会、阿里巴巴基金会、阿里巴巴达摩院共同举办。大赛不设报名门槛，全世界爱好数学的人都可参与，不论是否出身数学专业、是否投身数学研究。 2020年阿里巴巴达摩院邀请北京大学、剑桥大学、浙江大学等高校的顶尖数学教师组建了出题组。中科院院士、美国艺术与科学院院士、北京国际数学...

不知道是不是只有我这样子，还是你们也有过类似的经历。 上学的时候总有很多光辉历史，学年名列前茅，或者单科目大佬，但是虽然慢慢地长大了，你开始懈怠了，开始废掉了。。。 什么？你说不知道具体的情况是怎么样的？ 我来告诉你： 你常常潜意识里或者心理觉得，自己真正的生活或者奋斗还没有开始。总是幻想着自己还拥有大把时间，还有无限的可能，自己还能逆风翻盘，只不是自己还没开始罢了，自己以后肯定会变得特别厉害...

往往，我们看不进去大段大段的逻辑。深刻的哲理，往往短而精悍，一阵见血。问：产品经理挺漂亮的，有点心动，但不知道合不合得来。男生更看重女生的身材脸蛋，还是...

二哥，有个事想询问下您的意见，您觉得应届生值得去外包吗？公司虽然挺大的，中xx，但待遇感觉挺低，马上要报到，挺纠结的。

当HR压你价，说你只值7K时，你可以流畅地回答，记住，是流畅，不能犹豫。 礼貌地说：“7K是吗？了解了。嗯~其实我对贵司的面试官印象很好。只不过，现在我的手头上已经有一份11K的offer。来面试，主要也是自己对贵司挺有兴趣的，所以过来看看……”（未完） 这段话主要是陪HR互诈的同时，从公司兴趣，公司职员印象上，都给予对方正面的肯定，既能提升HR的好感度，又能让谈判气氛融洽，为后面的发挥留足空间。...

HashMap底层实现原理，红黑树，B+树，B树的结构原理 Spring的AOP和IOC是什么？它们常见的使用场景有哪些？Spring事务，事务的属性，传播行为，数据库隔离级别 Spring和SpringMVC，MyBatis以及SpringBoot的注解分别有哪些？SpringMVC的工作原理，SpringBoot框架的优点，MyBatis框架的优点 SpringCould组件有哪些，他们...

硅谷科技公司上班时间OPEN早已不是什么新鲜事，早九晚五是常态，但有很多企业由于不打卡，员工们10点、11点才“姗姗来迟”的情况也屡见不鲜。 这种灵活的考勤制度为人羡慕，甚至近年来，国内某些互联网企业也纷纷效仿。不过，硅谷普遍弹性的上班制度是怎么由来的呢？这种“流行性迟到”真的有那么轻松、悠哉吗？ 《动态规划专题班》 课程试听内容： 动态规划的解题要领 动态规划三大类 求最值/计数/可行性 常...

面试阿里p7被问到的问题(当时我只知道第一个)：@Conditional是做什么的?@Conditional多个条件是什么逻辑关系？条件判断在什么时候执...

终于懂了TCP和UDP协议区别

爬取彼岸桌面网站较为简单，用到了requests、lxml、Beautiful Soup4

编程语言层出不穷，从最初的机器语言到如今2500种以上的高级语言，程序员们大呼“学到头秃”。程序员一边面临编程语言不断推陈出新，一边面临由于许多代码已存在，程序员编写新应用程序时存在重复“搬砖”的现象。 无代码/低代码编程应运而生。无代码/低代码是一种创建应用的方法，它可以让开发者使用最少的编码知识来快速开发应用程序。开发者通过图形界面中，可视化建模来组装和配置应用程序。这样一来，开发者直...

最近面试了一个31岁8年经验的程序猿，让我有点感慨，大龄程序猿该何去何从。

说实话，自己的算法，我一个不会，太难了吧

已经连续五年参加大厂校招、社招的技术面试工作，简历看的不下于万份 这篇文章会用实例告诉你，什么是差的程序员简历！ 疫情快要结束了，各个公司也都开始春招了，作为即将红遍大江南北的新晋UP主，那当然要为小伙伴们做点事（手动狗头）。 就在公众号里公开征简历，义务帮大家看，并一一点评。《启舰：春招在即，义务帮大家看看简历吧》 一石激起千层浪，三天收到两百多封简历。 花光了两个星期的所有空闲时...

前几天我们公司做了一件蠢事，非常非常愚蠢的事情。我原以为从学校出来之后，除了找工作有测试外，不会有任何与考试有关的事儿。 但是，天有不测风云，公司技术总监、人事总监两位大佬突然降临到我们事业线，叫上我老大，给我们组织了一场别开生面的“考试”。 那是一个风和日丽的下午，我翘着二郎腿，左手端着一杯卡布奇诺，右手抓着我的罗技鼠标，滚动着轮轴，穿梭在头条热点之间。 “淡黄的长裙~蓬松的头发...

在2019年的ReactiveConf 上，《Elm in Action》的作者Richard Feldman对未来5年Web开发的发展做了预测，很有意思，分享给大家。如果你有机会从头...