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| <li class="md-nav__item"> |
| <a href="../config/read-config.html" class="md-nav__link"> |
| |
| |
| <span class="md-ellipsis"> |
| 在程序中读取配置信息 |
| </span> |
| |
| |
| </a> |
| </li> |
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| |
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| |
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| |
| <li class="md-nav__item"> |
| <a href="../config/kie.html" class="md-nav__link"> |
| |
| |
| <span class="md-ellipsis"> |
| 使用Kie |
| </span> |
| |
| |
| </a> |
| </li> |
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| |
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| |
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| |
| <li class="md-nav__item"> |
| <a href="../config/nacos.html" class="md-nav__link"> |
| |
| |
| <span class="md-ellipsis"> |
| 使用Nacos |
| </span> |
| |
| |
| </a> |
| </li> |
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| |
| |
| |
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| |
| |
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| |
| <li class="md-nav__item"> |
| <a href="../config/zookeeper.html" class="md-nav__link"> |
| |
| |
| <span class="md-ellipsis"> |
| 使用Zookeeper |
| </span> |
| |
| |
| </a> |
| </li> |
| |
| |
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| |
| |
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| |
| <li class="md-nav__item"> |
| <a href="../config/apollo.html" class="md-nav__link"> |
| |
| |
| <span class="md-ellipsis"> |
| 使用Apollo |
| </span> |
| |
| |
| </a> |
| </li> |
| |
| |
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| |
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| |
| |
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| |
| <li class="md-nav__item"> |
| <a href="../config/cse1.html" class="md-nav__link"> |
| |
| |
| <span class="md-ellipsis"> |
| 使用CSE1.0配置中心 |
| </span> |
| |
| |
| </a> |
| </li> |
| |
| |
| |
| |
| </ul> |
| </nav> |
| |
| </li> |
| |
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| |
| <li class="md-nav__item md-nav__item--active md-nav__item--nested"> |
| |
| |
| |
| <input class="md-nav__toggle md-toggle " type="checkbox" id="__nav_14" checked> |
| |
| |
| <label class="md-nav__link" for="__nav_14" id="__nav_14_label" tabindex="0"> |
| |
| |
| <span class="md-ellipsis"> |
| 服务治理功能参考 |
| </span> |
| |
| |
| <span class="md-nav__icon md-icon"></span> |
| </label> |
| |
| <nav class="md-nav" data-md-level="1" aria-labelledby="__nav_14_label" aria-expanded="true"> |
| <label class="md-nav__title" for="__nav_14"> |
| <span class="md-nav__icon md-icon"></span> |
| 服务治理功能参考 |
| </label> |
| <ul class="md-nav__list" data-md-scrollfix> |
| |
| |
| |
| |
| |
| |
| |
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| |
| <li class="md-nav__item md-nav__item--active"> |
| |
| <input class="md-nav__toggle md-toggle" type="checkbox" id="__toc"> |
| |
| |
| |
| |
| |
| <label class="md-nav__link md-nav__link--active" for="__toc"> |
| |
| |
| <span class="md-ellipsis"> |
| 流量特征治理 |
| </span> |
| |
| |
| <span class="md-nav__icon md-icon"></span> |
| </label> |
| |
| <a href="rule-governance.html" class="md-nav__link md-nav__link--active"> |
| |
| |
| <span class="md-ellipsis"> |
| 流量特征治理 |
| </span> |
| |
| |
| </a> |
| |
| |
| |
| <nav class="md-nav md-nav--secondary" aria-label="Table of contents"> |
| |
| |
| |
| |
| |
| |
| <label class="md-nav__title" for="__toc"> |
| <span class="md-nav__icon md-icon"></span> |
| Table of contents |
| </label> |
| <ul class="md-nav__list" data-md-component="toc" data-md-scrollfix> |
| |
| <li class="md-nav__item"> |
| <a href="#_2" class="md-nav__link"> |
| <span class="md-ellipsis"> |
| 概念定义 |
| </span> |
| </a> |
| |
| </li> |
| |
| <li class="md-nav__item"> |
| <a href="#_3" class="md-nav__link"> |
| <span class="md-ellipsis"> |
| 规范参考 |
| </span> |
| </a> |
| |
| <nav class="md-nav" aria-label="规范参考"> |
| <ul class="md-nav__list"> |
| |
| <li class="md-nav__item"> |
| <a href="#_4" class="md-nav__link"> |
| <span class="md-ellipsis"> |
| 业务定义 |
| </span> |
| </a> |
| |
| </li> |
| |
| <li class="md-nav__item"> |
| <a href="#_5" class="md-nav__link"> |
| <span class="md-ellipsis"> |
| 限流 |
| </span> |
| </a> |
| |
| </li> |
| |
| <li class="md-nav__item"> |
| <a href="#header" class="md-nav__link"> |
| <span class="md-ellipsis"> |
| 基于header的限流 |
| </span> |
| </a> |
| |
| </li> |
| |
| <li class="md-nav__item"> |
| <a href="#_6" class="md-nav__link"> |
| <span class="md-ellipsis"> |
| 重试 |
| </span> |
| </a> |
| |
| </li> |
| |
| <li class="md-nav__item"> |
| <a href="#_7" class="md-nav__link"> |
| <span class="md-ellipsis"> |
| 熔断 |
| </span> |
| </a> |
| |
| </li> |
| |
| <li class="md-nav__item"> |
| <a href="#_8" class="md-nav__link"> |
| <span class="md-ellipsis"> |
| 实例级熔断 |
| </span> |
| </a> |
| |
| </li> |
| |
| <li class="md-nav__item"> |
| <a href="#_9" class="md-nav__link"> |
| <span class="md-ellipsis"> |
| 隔离仓 |
| </span> |
| </a> |
| |
| </li> |
| |
| <li class="md-nav__item"> |
| <a href="#_10" class="md-nav__link"> |
| <span class="md-ellipsis"> |
| 实例级隔离仓 |
| </span> |
| </a> |
| |
| </li> |
| |
| <li class="md-nav__item"> |
| <a href="#_11" class="md-nav__link"> |
| <span class="md-ellipsis"> |
| 错误注入 |
| </span> |
| </a> |
| |
| </li> |
| |
| <li class="md-nav__item"> |
| <a href="#_12" class="md-nav__link"> |
| <span class="md-ellipsis"> |
| 公共参数 |
| </span> |
| </a> |
| |
| </li> |
| |
| </ul> |
| </nav> |
| |
| </li> |
| |
| </ul> |
| |
| </nav> |
| |
| </li> |
| |
| |
| |
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| |
| |
| |
| <li class="md-nav__item"> |
| <a href="governance-best-practise.html" class="md-nav__link"> |
| |
| |
| <span class="md-ellipsis"> |
| 流量特征治理最佳实践 |
| </span> |
| |
| |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
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| |
| <li class="md-nav__item"> |
| <a href="loadbalance.html" class="md-nav__link"> |
| |
| |
| <span class="md-ellipsis"> |
| 负载均衡 |
| </span> |
| |
| |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| |
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| |
| <li class="md-nav__item"> |
| <a href="ratelimit.html" class="md-nav__link"> |
| |
| |
| <span class="md-ellipsis"> |
| 限流 |
| </span> |
| |
| |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="router.html" class="md-nav__link"> |
| |
| |
| <span class="md-ellipsis"> |
| 灰度发布 |
| </span> |
| |
| |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| |
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| |
| <li class="md-nav__item"> |
| <a href="fault-injection.html" class="md-nav__link"> |
| |
| |
| <span class="md-ellipsis"> |
| 故障注入 |
| </span> |
| |
| |
| </a> |
| </li> |
| |
| |
| |
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| |
| |
| |
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| |
| <li class="md-nav__item"> |
| <a href="fail-retry.html" class="md-nav__link"> |
| |
| |
| <span class="md-ellipsis"> |
| 快速失败和重试 |
| </span> |
| |
| |
| </a> |
| </li> |
| |
| |
| |
| |
| </ul> |
| </nav> |
| |
| </li> |
| |
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| |
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| |
| <li class="md-nav__item md-nav__item--nested"> |
| |
| |
| |
| <input class="md-nav__toggle md-toggle " type="checkbox" id="__nav_15" > |
| |
| |
| <label class="md-nav__link" for="__nav_15" id="__nav_15_label" tabindex="0"> |
| |
| |
| <span class="md-ellipsis"> |
| 网关功能参考 |
| </span> |
| |
| |
| <span class="md-nav__icon md-icon"></span> |
| </label> |
| |
| <nav class="md-nav" data-md-level="1" aria-labelledby="__nav_15_label" aria-expanded="false"> |
| <label class="md-nav__title" for="__nav_15"> |
| <span class="md-nav__icon md-icon"></span> |
| 网关功能参考 |
| </label> |
| <ul class="md-nav__list" data-md-scrollfix> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../edge/open-service.html" class="md-nav__link"> |
| |
| |
| <span class="md-ellipsis"> |
| 介绍 |
| </span> |
| |
| |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| |
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| |
| <li class="md-nav__item"> |
| <a href="../edge/by-servicecomb-sdk.html" class="md-nav__link"> |
| |
| |
| <span class="md-ellipsis"> |
| 使用 Edge Service 做网关 |
| </span> |
| |
| |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../edge/zuul.html" class="md-nav__link"> |
| |
| |
| <span class="md-ellipsis"> |
| 使用 `zuul` 和 `spring cloud gateway` 做网关 |
| </span> |
| |
| |
| </a> |
| </li> |
| |
| |
| |
| |
| |
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| |
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| |
| <li class="md-nav__item"> |
| <a href="../edge/nginx.html" class="md-nav__link"> |
| |
| |
| <span class="md-ellipsis"> |
| nginx 网关简单介绍 |
| </span> |
| |
| |
| </a> |
| </li> |
| |
| |
| |
| |
| </ul> |
| </nav> |
| |
| </li> |
| |
| |
| |
| |
| |
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| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item md-nav__item--nested"> |
| |
| |
| |
| <input class="md-nav__toggle md-toggle " type="checkbox" id="__nav_16" > |
| |
| |
| <label class="md-nav__link" for="__nav_16" id="__nav_16_label" tabindex="0"> |
| |
| |
| <span class="md-ellipsis"> |
| 安全特性参考 |
| </span> |
| |
| |
| <span class="md-nav__icon md-icon"></span> |
| </label> |
| |
| <nav class="md-nav" data-md-level="1" aria-labelledby="__nav_16_label" aria-expanded="false"> |
| <label class="md-nav__title" for="__nav_16"> |
| <span class="md-nav__icon md-icon"></span> |
| 安全特性参考 |
| </label> |
| <ul class="md-nav__list" data-md-scrollfix> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="publickey.html" class="md-nav__link"> |
| |
| |
| <span class="md-ellipsis"> |
| 公钥认证 |
| </span> |
| |
| |
| </a> |
| </li> |
| |
| |
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| |
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| |
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| |
| <li class="md-nav__item"> |
| <a href="../security/tls.html" class="md-nav__link"> |
| |
| |
| <span class="md-ellipsis"> |
| 使用TLS通信 |
| </span> |
| |
| |
| </a> |
| </li> |
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| <li class="md-nav__item"> |
| <a href="../security/shi-yong-rsa-ren-zheng.html" class="md-nav__link"> |
| |
| |
| <span class="md-ellipsis"> |
| 使用RSA认证 |
| </span> |
| |
| |
| </a> |
| </li> |
| |
| |
| |
| |
| </ul> |
| </nav> |
| |
| </li> |
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| <li class="md-nav__item md-nav__item--nested"> |
| |
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| |
| <input class="md-nav__toggle md-toggle " type="checkbox" id="__nav_17" > |
| |
| |
| <label class="md-nav__link" for="__nav_17" id="__nav_17_label" tabindex="0"> |
| |
| |
| <span class="md-ellipsis"> |
| 专题文章 |
| </span> |
| |
| |
| <span class="md-nav__icon md-icon"></span> |
| </label> |
| |
| <nav class="md-nav" data-md-level="1" aria-labelledby="__nav_17_label" aria-expanded="false"> |
| <label class="md-nav__title" for="__nav_17"> |
| <span class="md-nav__icon md-icon"></span> |
| 专题文章 |
| </label> |
| <ul class="md-nav__list" data-md-scrollfix> |
| |
| |
| |
| |
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| |
| <li class="md-nav__item"> |
| <a href="../featured-topics/features.html" class="md-nav__link"> |
| |
| |
| <span class="md-ellipsis"> |
| 特性介绍 |
| </span> |
| |
| |
| </a> |
| </li> |
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| <li class="md-nav__item"> |
| <a href="../featured-topics/secrets.html" class="md-nav__link"> |
| |
| |
| <span class="md-ellipsis"> |
| 技术解密 |
| </span> |
| |
| |
| </a> |
| </li> |
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| <li class="md-nav__item"> |
| <a href="../featured-topics/upgrading.html" class="md-nav__link"> |
| |
| |
| <span class="md-ellipsis"> |
| 升级指导 |
| </span> |
| |
| |
| </a> |
| </li> |
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| <li class="md-nav__item"> |
| <a href="../featured-topics/compatibility.html" class="md-nav__link"> |
| |
| |
| <span class="md-ellipsis"> |
| 兼容问题和兼容性策略 |
| </span> |
| |
| |
| </a> |
| </li> |
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| <li class="md-nav__item"> |
| <a href="../featured-topics/performance.html" class="md-nav__link"> |
| |
| |
| <span class="md-ellipsis"> |
| 性能问题分析和调优 |
| </span> |
| |
| |
| </a> |
| </li> |
| |
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| |
| </ul> |
| </nav> |
| |
| </li> |
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| <li class="md-nav__item md-nav__item--nested"> |
| |
| |
| |
| <input class="md-nav__toggle md-toggle " type="checkbox" id="__nav_18" > |
| |
| |
| <label class="md-nav__link" for="__nav_18" id="__nav_18_label" tabindex="0"> |
| |
| |
| <span class="md-ellipsis"> |
| 常用配置项参考 |
| </span> |
| |
| |
| <span class="md-nav__icon md-icon"></span> |
| </label> |
| |
| <nav class="md-nav" data-md-level="1" aria-labelledby="__nav_18_label" aria-expanded="false"> |
| <label class="md-nav__title" for="__nav_18"> |
| <span class="md-nav__icon md-icon"></span> |
| 常用配置项参考 |
| </label> |
| <ul class="md-nav__list" data-md-scrollfix> |
| |
| |
| |
| |
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| |
| <li class="md-nav__item"> |
| <a href="../config-reference/rest-transport-client.html" class="md-nav__link"> |
| |
| |
| <span class="md-ellipsis"> |
| REST Transport Client 配置项 |
| </span> |
| |
| |
| </a> |
| </li> |
| |
| |
| |
| |
| </ul> |
| </nav> |
| |
| </li> |
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| <li class="md-nav__item md-nav__item--nested"> |
| |
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| <input class="md-nav__toggle md-toggle " type="checkbox" id="__nav_19" > |
| |
| |
| <label class="md-nav__link" for="__nav_19" id="__nav_19_label" tabindex="0"> |
| |
| |
| <span class="md-ellipsis"> |
| 常见问题 |
| </span> |
| |
| |
| <span class="md-nav__icon md-icon"></span> |
| </label> |
| |
| <nav class="md-nav" data-md-level="1" aria-labelledby="__nav_19_label" aria-expanded="false"> |
| <label class="md-nav__title" for="__nav_19"> |
| <span class="md-nav__icon md-icon"></span> |
| 常见问题 |
| </label> |
| <ul class="md-nav__list" data-md-scrollfix> |
| |
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| <li class="md-nav__item"> |
| <a href="../question-and-answer/faq.html" class="md-nav__link"> |
| |
| |
| <span class="md-ellipsis"> |
| FAQ |
| </span> |
| |
| |
| </a> |
| </li> |
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| <li class="md-nav__item"> |
| <a href="../question-and-answer/question_answer.html" class="md-nav__link"> |
| |
| |
| <span class="md-ellipsis"> |
| Q & A |
| </span> |
| |
| |
| </a> |
| </li> |
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| <li class="md-nav__item"> |
| <a href="../question-and-answer/interface-compatibility.html" class="md-nav__link"> |
| |
| |
| <span class="md-ellipsis"> |
| 微服务接口兼容常见问题 |
| </span> |
| |
| |
| </a> |
| </li> |
| |
| |
| |
| |
| </ul> |
| </nav> |
| |
| </li> |
| |
| |
| |
| </ul> |
| </nav> |
| </div> |
| </div> |
| </div> |
| |
| |
| |
| <div class="md-sidebar md-sidebar--secondary" data-md-component="sidebar" data-md-type="toc" > |
| <div class="md-sidebar__scrollwrap"> |
| <div class="md-sidebar__inner"> |
| |
| |
| <nav class="md-nav md-nav--secondary" aria-label="Table of contents"> |
| |
| |
| |
| |
| |
| |
| <label class="md-nav__title" for="__toc"> |
| <span class="md-nav__icon md-icon"></span> |
| Table of contents |
| </label> |
| <ul class="md-nav__list" data-md-component="toc" data-md-scrollfix> |
| |
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| <a href="#_2" class="md-nav__link"> |
| <span class="md-ellipsis"> |
| 概念定义 |
| </span> |
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| <li class="md-nav__item"> |
| <a href="#_3" class="md-nav__link"> |
| <span class="md-ellipsis"> |
| 规范参考 |
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| 业务定义 |
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| <span class="md-ellipsis"> |
| 限流 |
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| <li class="md-nav__item"> |
| <a href="#header" class="md-nav__link"> |
| <span class="md-ellipsis"> |
| 基于header的限流 |
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| <a href="#_6" class="md-nav__link"> |
| <span class="md-ellipsis"> |
| 重试 |
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| <a href="#_7" class="md-nav__link"> |
| <span class="md-ellipsis"> |
| 熔断 |
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| <span class="md-ellipsis"> |
| 实例级熔断 |
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| <a href="#_9" class="md-nav__link"> |
| <span class="md-ellipsis"> |
| 隔离仓 |
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| 实例级隔离仓 |
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| 错误注入 |
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| 公共参数 |
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| <h1 id="_1">流量特征治理</h1> |
| <p>流量特征治理旨在提供一种通用的，适合不同语言、不同微服务开发框架的治理规则。治理规则规定了微服务治理的过程、治理的策略，可以使用不同的开发框架、技术实现治理规则约定的治理能力。</p> |
| <p>开发者可以在 Java Chassis, <a href="https://github.com/huaweicloud/spring-cloud-huawei">Spring Cloud</a>, <a href="https://github.com/go-chassis/go-chassis">Go Chassis</a> 中使用该功能。</p> |
| <p>Java Chassis提供了实现 SDK，可以将其用于其他开发框架。SDK 默认采用 <a href="https://github.com/resilience4j">Resilience4j</a> 实现治理过程，并在规范中参考引用了很多其设计理念。规范没有约束治理过程的实现框架，可以很方便的使用其他的治理框架实现治理过程。 </p> |
| <h2 id="_2">概念定义</h2> |
| <p>流量特征治理可以从两个不同的角度进行描述。</p> |
| <p>从管理流程上，可以分为进行 <code>业务定义</code> 和设置 <code>治理规则</code> 两个步骤。系统架构师将请求流量根据特征打上标记，用于区分一个或者一组代表具体含义的业务，然后对这些业务设置治理规则。</p> |
| <p>从处理过程上，可以分为 <code>下发配置</code> 和 应用 <code>治理规则</code> 两个步骤。 可以通过配置文件、配置中心、环境变量等常见的配置管理手段下发配置。微服务 SDK 负责读取配置，解析治理规则，实现治理效果。</p> |
| <ul> |
| <li><code>业务定义</code></li> |
| </ul> |
| <p>可以根据请求的特征进行业务定义。</p> |
| <pre><code class="language-yaml">servicecomb: |
| matchGroup: |
| userLoginAction: | |
| matches: |
| - apiPath: |
| exact: "/login" |
| method: |
| - POST |
| - headers: |
| Authentication: |
| prefix: Basic |
| </code></pre> |
| <p>比如上面的示例定义了一个业务 <code>userLoginAction</code>，如果流量的 <code>apiPath=/login&method=POST</code>， 或者 请求头 <code>Authentication=Basic*</code> 那么认为这个流量是一个登陆操作。</p> |
| <ul> |
| <li><code>治理规则</code></li> |
| </ul> |
| <p>定义好业务后，可以给它们设置治理规则。</p> |
| <pre><code class="language-yaml">servicecomb: |
| rateLimiting: |
| userLoginAction: | |
| rate: 100 |
| </code></pre> |
| <p>比如上面的示例设置 <code>userLoginAction</code> 的限流策略是 100 TPS。 </p> |
| <h2 id="_3">规范参考</h2> |
| <h3 id="_4">业务定义</h3> |
| <pre><code class="language-yaml">servicecomb: |
| matchGroup: |
| userLoginAction: | |
| matches: |
| - name: firstMatch |
| apiPath: |
| exact: "/login/v1" |
| method: |
| - POST |
| headers: |
| Authentication: |
| prefix: Basic |
| serviceName: exampleService |
| - name: secondeMatch |
| apiPath: |
| exact: "/login/v2" |
| method: |
| - POST |
| headers: |
| Authentication: |
| prefix: Basic |
| serviceName: exampleService |
| services: exampleService |
| name: userLoginAction |
| </code></pre> |
| <p>一个业务对应一个 Key， userLoginAction 为 Key 的名称。 一个业务可以定义多个标记规则，每个标记规则里面可以定义 <code>apiPath</code>, <code>method</code>, <code>headers</code>, <code>serviceName</code> 等匹配规则。 不同标记规则是或的关系，匹配规则是与的关系。</p> |
| <ul> |
| <li> |
| <p><code>services</code>: 可选。指出这个业务定义的生效范围。 在应用系统中，业务定义可能对于所有微服务都是可见的（如果业务定义只下发到该微服务，则不需要这个配置），一个微服务只会启用 <code>services</code> 包含自己的规则。这个属性可选，表示这条规则默认生效。可以使用 <code>example:1.0.0</code> 格式指明服务和版本，多个服务用逗号分隔，比如：<code>foo:1.0.0,bar</code>。</p> |
| </li> |
| <li> |
| <p><code>name</code>: 可选。业务定义的名称。</p> |
| </li> |
| </ul> |
| <p>在match中提供了一系列的算子来对 <code>apiPath</code> 或者 <code>headers</code> 进行匹配. </p> |
| <ul> |
| <li><code>exact</code>: 精确匹配</li> |
| <li><code>prefix</code>: 前缀匹配</li> |
| <li><code>suffix</code>: 后缀匹配</li> |
| <li><code>contains</code>: 包含， 目标字符串是否包含模式字符串</li> |
| <li><code>compare</code>: 比较： 支持 >,<,>=,<=,=,!= 符号匹配，处理时会把模式字符串和目标字符串转化为 Double 类型进行比较，支持的数据范围为 Double 的数据范围。在进行 = 和 != 判断时 ， 如果二者的差值小于1e-6就视为相等。例如模式串为: >-10 会对大于-10以上的目标串匹配成功。</li> |
| </ul> |
| <p>业务定义可以在不同的应用层实现，比如在提供 REST 接口的服务端，可以通过 <code>HttpServletRequest</code> 获取请求信息。在 RestTemplate 调用的客户端，可以从 |
| <code>RestTemplate</code> 获取请求信息。不同的框架和应用层，提取信息的方式不一样。 实现层通过将特征映射到 <code>GovernanceRequest</code> 来屏蔽这些差异，使得在不同的框架，不同的应用层都可以使用治理。</p> |
| <pre><code class="language-java">public class GovernanceRequest { |
| /** |
| headers with this request, maybe null. |
| For provider: headers indicates the request headers to me. |
| For consumer: headers indicates the request headers to the target. |
| */ |
| private Map<String, String> headers; |
| |
| /** |
| uri with this request, maybe null. |
| For provider: uri indicates the request uri to me. |
| For consumer: uri indicates the request uri to the target. |
| */ |
| private String uri; |
| |
| /** |
| method with this request, maybe null. |
| For provider: method indicates the request method to me. |
| For consumer: method indicates the request method to the target. |
| */ |
| private String method; |
| |
| /** |
| instance id with this request, maybe null. |
| For provider: instanceId indicates who calls me. |
| For consumer: instanceId indicates the target instance. |
| */ |
| private String instanceId; |
| |
| /** |
| microservice id (microservice name or application name + microservice name) with this request, maybe null. |
| For provider: serviceName indicates who calls me. |
| For consumer: serviceName indicates the target service. |
| */ |
| private String serviceName; |
| } |
| |
| </code></pre> |
| <h3 id="_5">限流</h3> |
| <pre><code class="language-yaml">servicecomb: |
| rateLimiting: |
| userLoginAction: | |
| timeoutDuration: 0 |
| limitRefreshPeriod: 1000 |
| rate: 1 |
| </code></pre> |
| <p>规则解释：限流规则借鉴了<code>Resilience4j</code>的思想，其原理为： 每隔limitRefreshPeriod的时间会加入limitForPeriod（即rate）个新许可，如果获取不到新的许可(已经触发限流)，当前线程会park，最多等待timeoutDuration的时间，默认单位为毫秒。</p> |
| <h3 id="header">基于header的限流</h3> |
| <pre><code class="language-yaml">servicecomb: |
| identifierRateLimiting: |
| userLoginAction: | |
| timeoutDuration: 0 |
| limitRefreshPeriod: 1000 |
| rate: 1 |
| identifier: user-id |
| </code></pre> |
| <p>基于header的限流和限流含义类似，它会针对 <code>identifier</code> 指定的 header 值， 每个值创建一个限流器。</p> |
| <h3 id="_6">重试</h3> |
| <pre><code class="language-yaml">servicecomb: |
| retry: |
| userLoginAction: | |
| maxAttempts: 3 |
| retryOnSame: 0 |
| retryOnResponseStatus: |
| - 502 |
| - 503 |
| waitDuration: 1 |
| </code></pre> |
| <p>规则解释：重试规则借鉴了<code>Resilience4j</code>的思想，其原理为：如果响应的错误码(502, 503)计算结果满足重试条件，或者异常在重试异常清单里面，则进行重试。下一次重试等待时间为 waitDuration。 </p> |
| <p>重试等待时间和具体的框架与运行机制有关。重试等待时间必须大于0。</p> |
| <h3 id="_7">熔断</h3> |
| <pre><code class="language-yaml">servicecomb: |
| circuitBreaker: |
| userLoginAction: | |
| failureRateThreshold: 50 |
| slowCallRateThreshold: 100 |
| slowCallDurationThreshold: 60000 |
| minimumNumberOfCalls: 100 |
| slidingWindowType: COUNT_BASED |
| slidingWindowSize: 100 |
| recordFailureStatus: |
| - 502 |
| - 503 |
| waitDurationInOpenState: 60000 |
| permittedNumberOfCallsInHalfOpenState: 10 |
| forceClosed: false |
| forceOpen: false |
| </code></pre> |
| <p>规则解释：熔断规则借鉴了<code>Resilience4j</code>的思想，其原理为：达到指定 failureRateThreshold 错误率或者 slowCallRateThreshold 慢请求率时进行熔断，慢请求通过 slowCallDurationThreshold 定义。minimumNumberOfCalls 是达到熔断要求的最低请求数量门槛。slidingWindowType指定滑动窗口 |
| 类型，默认可选 COUNT_BASED和TIME_BASED 分别是基于请求数量窗口和基于时间窗口。slidingWindowSize 指定窗口大小，根据滑动窗口类型，单位是请求数量或者秒，根据滑动窗口类型决定。 forceClosed 表示强制关闭熔断器，即熔断器不工作；forceOpen表示强制开启熔断器，即请求都会发生熔断。</p> |
| <p>熔断时间是waitDurationInOpenState，达到时间会放通permittedNumberOfCallsInHalfOpenState个请求。放通后，如果降低到阈值一下，则恢复；如果没有降低到阈值以下，则继续隔离。</p> |
| <h3 id="_8">实例级熔断</h3> |
| <pre><code class="language-yaml">servicecomb: |
| instanceIsolation: |
| userLoginAction: | |
| failureRateThreshold: 50 |
| slowCallRateThreshold: 100 |
| slowCallDurationThreshold: 60000 |
| minimumNumberOfCalls: 100 |
| slidingWindowType: COUNT_BASED |
| slidingWindowSize: 100 |
| recordFailureStatus: |
| - 502 |
| - 503 |
| waitDurationInOpenState: 60000 |
| permittedNumberOfCallsInHalfOpenState: 10 |
| forceClosed: false |
| forceOpen: false |
| </code></pre> |
| <p>实例级熔断和熔断的含义类似，但是他会针对每个实例创建一个熔断器。Java Chassis会监听实例熔断事件，并调整熔断实例的优先级，降低对熔断实例的使用频率以达到实例隔离的作用。</p> |
| <h3 id="_9">隔离仓</h3> |
| <pre><code class="language-yaml">servicecomb: |
| bulkhead: |
| userLoginAction: | |
| maxConcurrentCalls: 1000 |
| maxWaitDuration: 0 |
| </code></pre> |
| <p>规则解释：隔离仓规则借鉴了<code>Resilience4j</code>的思想，其原理为：当最大并发数超过 maxConcurrentCalls，等待 maxWaitDuration |
| 竞争资源，如果获得资源，则继续处理，如果获取不到，则拒绝执行请求。在异步框架，建议 maxWaitDuration 设置为0，防止阻塞事件派发线程。</p> |
| <h3 id="_10">实例级隔离仓</h3> |
| <pre><code class="language-yaml">servicecomb: |
| instanceBulkhead: |
| userLoginAction: | |
| maxConcurrentCalls: 1000 |
| maxWaitDuration: 0 |
| </code></pre> |
| <p>实例级隔离仓和隔离仓的含义类似，但是他会针对每个实例创建一个隔离仓。</p> |
| <h3 id="_11">错误注入</h3> |
| <pre><code class="language-yaml">servicecomb: |
| faultInjection: |
| userLoginAction: | |
| type: delay |
| delayTime: 1000 |
| percentage: 50 |
| errorCode: 500 |
| fallbackType: ThrowException |
| forceClosed: false |
| </code></pre> |
| <p>规则解释：错误注入分为 <code>delay</code> 和 <code>abort</code> 两种。<code>delay</code> 表示对于 <code>percentage</code> 的请求，延迟 <code>delayTime</code>。 <code>abort</code> 表示对于 <code>percentage</code> 的请求，根据 <code>fallbackType</code> 抛出异常还是返回 null。 </p> |
| <h3 id="_12">公共参数</h3> |
| <p>治理规则存在一些公共参数， 比如 <code>services</code>, <code>order</code>, <code>name</code>。比如：</p> |
| <pre><code class="language-yaml">servicecomb: |
| faultInjection: |
| userLoginAction: | |
| type: delay |
| delayTime: 1000 |
| percentage: 50 |
| errorCode: 500 |
| fallbackType: ThrowException |
| forceClosed: false |
| services: helloService |
| order: 1 |
| name: userLoginAction |
| </code></pre> |
| <ul> |
| <li>services: 表示该治理规则生效的微服务名称列表。 在应用系统中，治理规则可能对于所有微服务都是可见的（如果治理规则只下发到该微服务，则不需要这个配置），一个微服务只会启用 <code>services</code> 包含自己的规则。这个属性可选，表示这条规则默认生效。可以使用 <code>example:1.0.0</code> 格式指明服务和版本，多个服务用逗号分隔，比如：<code>foo:1.0.0,bar</code>。</li> |
| <li>order: 表示该治理规则的优先级，值越小优先级越高。 当一个请求匹配多个治理规则的时候，按照优先级使用优先级高的治理规则。</li> |
| <li>name: 表示该治理规则的名称，系统内部使用属性，其值等于规则里面的业务名称，用户不能修改。</li> |
| </ul> |
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