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| <a href=/zh-cn/blog/2023/08/25/coc-asia-2023-大会精彩回顾/>Dubbo 微服务专题论坛</a> 精彩回顾！</h4><p>Community Over Code 2023 暨 ApacheCon Asia 2023 大会在 8月18 - 8月20日在北京举办，让我们一起回顾一下可观测、Native、协议、Kubernetes部署、企业微服务实践等 8 个议题的精彩分享！</p></div></aside></div></header><div class=td-outer><main role=main class=td-main><h1 id=柔性负载均衡-柔性服务>柔性负载均衡 (柔性服务)</h1><p>柔性服务是一种去中心化的智能负载均衡组件，同时也是 Dubbo-go 3.0 版本中重磅新特性之一。柔性服务尚处于早期实验阶段，该特性将在后续版本中持续优化，与 Dubbo 社区共同探索出一套适合微服务场景的最佳实践。</p><p>传统的负载均衡算法是由随机节点、RoundRobin 等算法实现，他们的局限性在于不知道当前服务提供者的负载情况，算法总是以尽可能公平的概率调用不同的服务提供者。在实践中，公平不等于高性能，集群服务性能还与服务负载、任务复杂度等多因素相关。为解决传统负载均衡算法的不足，Dubbo-go 在 3.0 版本中引入了柔性服务，实现了容量动态评估和分流功能。</p><p>容量评估是柔性服务的核心，它能动态评估服务端容量水平。在容量评估的过程中，两个核心指标是 TPS 和响应时间，要平衡系统利用率和系统性能两者之间的关系，使整体处于最佳的状态。</p><ul><li>TPS 从服务提供者的角度反映系统利用率。在系统压力未饱和前，请求数越大则系统利用率越高，但是进一步加大请求量直至系统过饱和后，出现过载的问题，导致整体效率呈下降趋势。</li><li>响应时间是从服务调用者的角度反映系统性能。在系统压力未饱和前，响应时间与请求数成线性增长的关系，但是进一步加大请求量直至系统过饱和后，响应时间与请求数成指数级增长。</li></ul><p><img src=/imgs/docs3-v2/golang-sdk/samples/adaptive-service/adaptive.png alt=img></p><p>柔性服务则在调用过程中收集</p><p>在 Dubbo-go 3.0 版本中，支持服务柔性负载均衡。在微服务场景下，客户端会在调用过程中收集该服务下游 server 实例的硬件资源消耗情况，通过容量评估与筛选策略，选择最合适的下游实例进行调用，从而提升系统整体的性能。</p><p>服务柔性将在之后的迭代中持续优化，追求与 Dubbo 社区共同探索出最佳实践。</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>© 2023 The Apache Software Foundation. Apache and the Apache feather logo are trademarks of The Apache Software Foundation. 保留所有权利</small></div></div></div></footer><div class="row pt-2 pb-2 footer-margin-0"><div class="container-fluid mx-sm-5"><div class=text-center id=my-footer><img style=float:left alt=apache_logo src=/imgs/apache_logo.png><ul><li><a href=https://www.apache.org>Foundation</a></li><li><a href=https://www.apache.org/licenses/>License</a></li><li><a href=https://www.apache.org/security/>Security</a></li><li><a href=https://www.apache.org/events/current-event>Events</a></li><li><a href=https://www.apache.org/foundation/sponsorship.html>Sponsorship</a></li><li><a href=https://privacy.apache.org/policies/privacy-policy-public.html>Privacy</a></li><li><a href=https://www.apache.org/foundation/thanks.html>Thanks</a></li></ul></div></div></div><script src=/js/popper.min.js integrity=sha384-ZMP7rVo3mIykV+2+9J3UJ46jBk0WLaUAdn689aCwoqbBJiSnjAK/l8WvCWPIPm49 crossorigin=anonymous></script> |
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