| <!doctype html><html lang=en class=no-js><head class=live-site><meta name=ROBOTS content="INDEX, FOLLOW"><link rel=canonical href=https://cn.dubbo.apache.org/en/docs3-v2/golang-sdk/tutorial/governance/limit/adaptive-service/><script>var _hmt=_hmt||[];(function(){var e,t=document.createElement("script");t.src="https://hm.baidu.com/hm.js?3b78f49ba47181e4d998a66b689446e9",e=document.getElementsByTagName("script")[0],e.parentNode.insertBefore(t,e)})()</script><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1,shrink-to-fit=no"><meta http-equiv=Content-Security-Policy content="frame-src *"><meta name=generator content="Hugo 0.122.0"><link rel="shortcut icon" type=image/png href=/imgs/favicon.png><link rel=apple-touch-icon href=/favicons/apple-touch-icon-180x180.png sizes=180x180><link rel=manifest href=/manifest.webmanifest><title>dubbogo 3.0 flexible service | Apache Dubbo</title><meta property="og:title" content="dubbogo 3.0 flexible service"> |
| <meta property="og:description" content="dubbogo 3.0 flexible service"><meta property="og:type" content="article"><meta property="og:url" content="https://cn.dubbo.apache.org/en/docs3-v2/golang-sdk/tutorial/governance/limit/adaptive-service/"><meta property="article:section" content="docs3-v2"><meta property="article:modified_time" content="2023-01-02T22:00:39+08:00"><meta itemprop=name content="dubbogo 3.0 flexible service"><meta itemprop=description content="dubbogo 3.0 flexible service"><meta itemprop=dateModified content="2023-01-02T22:00:39+08:00"><meta itemprop=wordCount content="405"><meta itemprop=keywords content><meta name=twitter:card content="summary"><meta name=twitter:title content="dubbogo 3.0 flexible service"><meta name=twitter:description content="dubbogo 3.0 flexible service"><script async src="https://www.googletagmanager.com/gtag/js?id=G-NM6FFMT51J"></script><script>var doNotTrack=!1;if(!doNotTrack){window.dataLayer=window.dataLayer||[];function gtag(){dataLayer.push(arguments)}gtag("js",new Date),gtag("config","G-NM6FFMT51J",{anonymize_ip:!1})}</script><link rel=preload href=/scss/main.min.f77e221bcdbe0cadb996060fe82063c747b60c229a1f8bbf0ee529adbadd84fa.css as=style><link href=/scss/main.min.f77e221bcdbe0cadb996060fe82063c747b60c229a1f8bbf0ee529adbadd84fa.css rel=stylesheet integrity><script src=/js/jquery-3.5.1.min.js integrity="sha256-9/aliU8dGd2tb6OSsuzixeV4y/faTqgFtohetphbbj0=" crossorigin=anonymous></script><meta name=theme-color content="#326ce5"><link rel=stylesheet href=/css/feature-states.css><meta name=description content="dubbogo 3.0 flexible service"><meta property="og:description" content="dubbogo 3.0 flexible service"><meta name=twitter:description content="dubbogo 3.0 flexible service"><meta property="og:url" content="https://cn.dubbo.apache.org/en/docs3-v2/golang-sdk/tutorial/governance/limit/adaptive-service/"><meta property="og:title" content="dubbogo 3.0 flexible service"><meta name=twitter:title content="dubbogo 3.0 flexible service"><meta name=twitter:image:alt content="Apache Dubbo"><meta property="og:type" content="article"><meta name=viewport content="width=device-width"><script async defer src=/js/github-buttons.js></script><link href=/css/community.css rel=stylesheet><link href=/css/contactus.css rel=stylesheet><link href=/css/language.css rel=stylesheet><script src=/js/script.js></script></head><body class=td-page><header><nav class="js-navbar-scroll navbar navbar-expand navbar-dark flex-column flex-md-row td-navbar" data-auto-burger=primary><a class=navbar-brand href=/en/><span class=navbar-logo></span><span class="text-uppercase font-weight-bold">Apache Dubbo</span></a><div class="td-navbar-nav-scroll ml-md-auto" id=main_navbar><ul class="navbar-nav mt-2 mt-lg-0"><li class="nav-item mr-4 mb-2 mb-lg-0"><a class=nav-link href=/en/overview/><span>Overview</span></a></li><li class="nav-item mr-4 mb-2 mb-lg-0"><a class="nav-link active" href=/en/docs3-v2/><span class=active>SDK Manual</span></a></li><li class="nav-item mr-4 mb-2 mb-lg-0"><a class=nav-link href=/en/blog/><span>Blog</span></a></li><li class="nav-item mr-4 mb-2 mb-lg-0"><a class=nav-link href=/en/download/><span>Download</span></a></li><li class="nav-item mr-4 mb-2 mb-lg-0"><a class=nav-link href=https://start.dubbo.apache.org/bootstrap.html target=_blank><span>Initializer</span><i class='fas fa-external-link-alt'></i></a></li><li class="nav-item dropdown d-lg-block"><a class="nav-link dropdown-toggle" href=# id=navbarDropdownMenuLink role=button data-toggle=dropdown aria-haspopup=true aria-expanded=false>English</a><div class="dropdown-menu dropdown-menu-right" aria-labelledby=navbarDropdownMenuLink><a class=dropdown-item href=/zh-cn/>中文</a></div></li><li class="nav-item dropdown d-lg-block"><div class="nav-item d-none d-lg-block"></div></li></ul></div></nav></header><div class=td-outer><main role=main class=td-main><h1 id=flexible-load-balancing-flexible-service>Flexible load balancing (flexible service)</h1><p>Flexible service is a decentralized intelligent load balancing component, and it is also one of the major new features in Dubbo-go version 3.0. Flexible services are still in the early experimental stage, and this feature will continue to be optimized in subsequent versions, and we will work with the Dubbo community to explore a set of best practices suitable for microservice scenarios.</p><p>The traditional load balancing algorithm is implemented by algorithms such as random nodes and RoundRobin. Their limitation is that they do not know the load situation of the current service provider, and the algorithm always calls different service providers with as fair a probability as possible. In practice, fairness does not mean high performance, and cluster service performance is also related to multiple factors such as service load and task complexity. In order to solve the shortcomings of traditional load balancing algorithms, Dubbo-go introduced flexible services in version 3.0, realizing dynamic capacity evaluation and distribution functions.</p><p>Capacity assessment is the core of flexible services, which can dynamically assess the capacity level of the server. In the process of capacity evaluation, the two core indicators are TPS and response time. It is necessary to balance the relationship between system utilization and system performance, so that the whole is in the best state.</p><ul><li>TPS reflects system utilization from the perspective of service providers. Before the system pressure is saturated, the greater the number of requests, the higher the system utilization rate. However, if the request volume is further increased until the system is oversaturated, the problem of overload occurs, resulting in a downward trend in overall efficiency.</li><li>Response time reflects system performance from the perspective of service callers. Before the system pressure is not saturated, the response time increases linearly with the number of requests, but when the amount of requests is further increased until the system is oversaturated, the response time and the number of requests increase exponentially.</li></ul><p><img src=/imgs/docs3-v2/golang-sdk/samples/adaptive-service/adaptive.png alt=img></p><p>Flexible services are collected during the call</p><p>In Dubbo-go version 3.0, service flexible load balancing is supported. In the microservice scenario, the client will collect the hardware resource consumption of the downstream server instance of the service during the invocation process, and select the most suitable downstream instance for invocation through capacity evaluation and screening strategies, thereby improving the overall system performance.</p><p>Service flexibility will continue to be optimized in subsequent iterations, seeking to explore best practices with the Dubbo community.</p></main></div><footer class="bg-dark py-5 row d-print-none footer-margin-0"><div class="container-fluid mx-sm-5"><div class=row><div class="col-6 col-sm-4 text-xs-center order-sm-2"><ul class="list-inline mb-0"><li class="list-inline-item mx-2 h3" data-toggle=tooltip data-placement=top title="Dubbo mailing list archive" aria-label="Dubbo mailing list archive"><a class=text-white target=_blank rel="noopener noreferrer" href=https://lists.apache.org/list.html?dev@dubbo.apache.org><i class="fa fa-envelope"></i></a></li></ul></div><div class="col-6 col-sm-4 text-right text-xs-center order-sm-3"><ul class="list-inline mb-0"><li class="list-inline-item mx-2 h3" data-toggle=tooltip data-placement=top title=GitHub aria-label=GitHub><a class=text-white target=_blank rel="noopener noreferrer" href=https://github.com/apache/dubbo><i class="fab fa-github"></i></a></li><li class="list-inline-item mx-2 h3" data-toggle=tooltip data-placement=top title="Subscribe to mailing list" aria-label="Subscribe to mailing list"><a class=text-white target=_blank rel="noopener noreferrer" href=mailto:dev-subscribe@dubbo.apache.org><i class="fa fa-envelope"></i></a></li></ul></div><div class="col-12 col-sm-4 text-center py-2 order-sm-2"><small class=text-white>© 2024 The Apache Software Foundation. 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