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class="theme-doc-version-badge badge badge--secondary">版本：Next(1.6.0)</span><div class="tocCollapsible_ETCw theme-doc-toc-mobile tocMobile_ITEo"><button type="button" class="clean-btn tocCollapsibleButton_TO0P">On this page</button></div><div class="theme-doc-markdown markdown"><header><h1>CS HA 架构设计</h1></header><h2 class="anchor anchorWithStickyNavbar_LWe7" id="cs-ha架构设计"><strong>CS HA架构设计</strong><a class="hash-link" href="#cs-ha架构设计" title="Direct link to heading"></a></h2><h3 class="anchor anchorWithStickyNavbar_LWe7" id="1cs-ha架构概要">1，CS HA架构概要<a class="hash-link" href="#1cs-ha架构概要" title="Direct link to heading"></a></h3><h4 class="anchor anchorWithStickyNavbar_LWe7" id="1cs-ha架构图">（1）CS HA架构图<a class="hash-link" href="#1cs-ha架构图" title="Direct link to heading"></a></h4><p><img loading="lazy" src="/zh-CN/assets/images/linkis-contextservice-ha-01-67188a52f5dc0ac74a4431b9a86ca80c.png" width="1102" height="620" class="img_ev3q"></p><h4 class="anchor anchorWithStickyNavbar_LWe7" id="2要解决的问题">（2）要解决的问题<a class="hash-link" href="#2要解决的问题" title="Direct link to heading"></a></h4><ul><li><p>Context instance对象的HA</p></li><li><p>Client创建工作流时生成CSID请求</p></li><li><p>CS Server的别名列表</p></li><li><p>CSID统一的生成和解析规则</p></li></ul><h4 class="anchor anchorWithStickyNavbar_LWe7" id="3主要设计思路">（3）主要设计思路<a class="hash-link" href="#3主要设计思路" title="Direct link to heading"></a></h4><p>①负载均衡</p><p>当客户端创建新的工作流时，等概率随机请求到某台Server的HA模块生成新的HAID，HAID信息包含该主Server信息（以下称主instance），和备选instance，其中备选instance为剩余Server中负载最低的instance，以及一个对应的ContextID。生成的HAID与该工作流绑定且被持久化到数据库，并且随后该工作流所有变更操作请求都将发送至主instance，实现负载的均匀分配。</p><p>②高可用</p><p>在后续操作中，当客户端或者gateway判定主instance不可用时，会将操作请求转发至备instance处理，从而实现服务的高可用。备instance的HA模块会根据HAID信息首先验证请求合法性。</p><p>③别名机制</p><p>对机器采用别名机制，HAID中包含的Instance信息采用自定义别名，后台维护别名映射队列。在客户端交互时采用HAID，而与后台其它组件交互则采用ContextID，在实现具体操作时采用动态代理机制，将HAID转换为ContextID进行处理。</p><h3 class="anchor anchorWithStickyNavbar_LWe7" id="2模块设计">2，模块设计<a class="hash-link" href="#2模块设计" title="Direct link to heading"></a></h3><h4 class="anchor anchorWithStickyNavbar_LWe7" id="1模块图">（1）模块图<a class="hash-link" href="#1模块图" title="Direct link to heading"></a></h4><p><img loading="lazy" src="/zh-CN/assets/images/linkis-contextservice-ha-02-9971bf8fd601ded6ece61eac35587e87.png" width="1102" height="620" class="img_ev3q"></p><h4 class="anchor anchorWithStickyNavbar_LWe7" id="2具体模块">（2）具体模块<a class="hash-link" href="#2具体模块" title="Direct link to heading"></a></h4><p>①ContextHAManager模块</p><p>提供接口供CS Server调用生成CSID及HAID，并提供基于动态代理的别名转换接口；</p><p>调用持久化模块接口持久化CSID信息；</p><p>②AbstractContextHAManager模块</p><p>ContextHAManager的抽象，可支持实现多种ContextHAManager；</p><p>③InstanceAliasManager模块</p><p>RPC模块提供Instance与别名转换接口，维护别名映射队列，并提供别名与CS |
| Server实例的查询；提供验证主机是否有效接口；</p><p>④HAContextIDGenerator模块</p><p>生成新的HAID，并且封装成客户端约定格式返回给客户端。HAID结构如下：</p><p>\${第一个instance长度}\${第二个instance长度}{instance别名1}{instance别名2}{实际ID}，实际ID定为ContextID |
| Key；</p><p>⑤ContextHAChecker模块</p><p>提供HAID的校验接口。收到的每个请求会校验ID格式是否有效，以及当前主机是否为主Instance或备Instance：如果是主Instance，则校验通过；如果为备Instance，则验证主Instance是否失效，主Instance失效则验证通过。</p><p>⑥BackupInstanceGenerator模块</p><p>生成备用实例，附加在CSID信息里；</p><p>⑦MultiTenantBackupInstanceGenerator接口</p><p>（保留接口，暂不实现）</p><h3 class="anchor anchorWithStickyNavbar_LWe7" id="3-uml类图">3. UML类图<a class="hash-link" href="#3-uml类图" title="Direct link to heading"></a></h3><p><img loading="lazy" src="/zh-CN/assets/images/linkis-contextservice-ha-03-d732b58d7da28dc28bc6f909140dd15e.png" width="2289" height="1603" class="img_ev3q"></p><h3 class="anchor anchorWithStickyNavbar_LWe7" id="4-ha模块操作时序图">4. HA模块操作时序图<a class="hash-link" href="#4-ha模块操作时序图" title="Direct link to heading"></a></h3><p><img loading="lazy" src="/zh-CN/assets/images/linkis-contextservice-ha-04-d13009eb9671bd60c9ff019ff7ba6995.png" width="1169" height="827" class="img_ev3q"></p><p>第一次生成CSID: |
| 由客户端发出请求，Gateway转发到任一Server，HA模块生成HAID，包含主Instance和备instance及CSID，完成工作流与HAID的绑定。</p><p>当客户端发送变更请求时，Gateway判定主Instance失效，则将请求转发到备Instance进行处理。备Instance上实例验证HAID有效后，加载Instance并处理请求。</p></div><footer class="theme-doc-footer docusaurus-mt-lg"><div class="theme-doc-footer-edit-meta-row row"><div class="col"><a href="https://github.com/apache/linkis-website/edit/dev/i18n/zh-CN/docusaurus-plugin-content-docs/current/architecture/feature/public-enhancement-services/context-service/context-service-highavailable.md" target="_blank" rel="noreferrer noopener" class="theme-edit-this-page"><svg fill="currentColor" height="20" width="20" viewBox="0 0 40 40" class="iconEdit_Z9Sw" aria-hidden="true"><g><path d="m34.5 11.7l-3 3.1-6.3-6.3 3.1-3q0.5-0.5 1.2-0.5t1.1 0.5l3.9 3.9q0.5 0.4 0.5 1.1t-0.5 1.2z m-29.5 17.1l18.4-18.5 6.3 6.3-18.4 18.4h-6.3v-6.2z"></path></g></svg>编辑</a></div><div class="col lastUpdated_vwxv"></div></div></footer></article><nav class="pagination-nav docusaurus-mt-lg" aria-label="Docs pages navigation"><a class="pagination-nav__link pagination-nav__link--prev" href="/zh-CN/docs/1.6.0/architecture/feature/public-enhancement-services/context-service/context-service-client"><div class="pagination-nav__sublabel">上一篇</div><div class="pagination-nav__label">CS Client</div></a><a class="pagination-nav__link pagination-nav__link--next" href="/zh-CN/docs/1.6.0/architecture/feature/public-enhancement-services/context-service/context-service-listener"><div class="pagination-nav__sublabel">下一篇</div><div class="pagination-nav__label">CS Listener 架构</div></a></nav></div></div><div class="col col--3"><div class="tableOfContents_bqdL thin-scrollbar theme-doc-toc-desktop"><ul class="table-of-contents table-of-contents__left-border"><li><a href="#cs-ha架构设计" class="table-of-contents__link toc-highlight"><strong>CS HA架构设计</strong></a><ul><li><a href="#1cs-ha架构概要" class="table-of-contents__link toc-highlight">1，CS HA架构概要</a></li><li><a href="#2模块设计" class="table-of-contents__link toc-highlight">2，模块设计</a></li><li><a href="#3-uml类图" class="table-of-contents__link toc-highlight">3. UML类图</a></li><li><a href="#4-ha模块操作时序图" class="table-of-contents__link toc-highlight">4. HA模块操作时序图</a></li></ul></li></ul></div></div></div></div></main></div></div><footer class="footer"><div class="container container-fluid"><div class="row footer__links"><div class="col footer__col"><div class="footer__title">Linkis</div><ul class="footer__items clean-list"><li class="footer__item"><a class="footer__link-item" href="/zh-CN/docs/latest/about/introduction">文档</a></li><li class="footer__item"><a class="footer__link-item" href="/zh-CN/faq/main">FAQ</a></li><li class="footer__item"><a href="https://github.com/apache/linkis/releases" target="_blank" rel="noopener noreferrer" class="footer__link-item">版本</a></li></ul></div><div class="col footer__col"><div class="footer__title">社区</div><ul class="footer__items clean-list"><li class="footer__item"><a href="https://github.com/apache/linkis" target="_blank" rel="noopener noreferrer" class="footer__link-item">GitHub</a></li><li class="footer__item"><a href="https://github.com/apache/linkis/issues" target="_blank" rel="noopener noreferrer" class="footer__link-item">Issue Tracker</a></li><li class="footer__item"><a href="https://github.com/apache/linkis/pulls" target="_blank" rel="noopener noreferrer" class="footer__link-item">Pull Requests</a></li></ul></div><div class="col footer__col"><div class="footer__title">订阅邮件组</div><ul class="footer__items clean-list"><li class="footer__item"><a class="footer__link-item" href="/zh-CN/community/how-to-subscribe">如何订阅</a></li><li class="footer__item"><a href="mailto:dev-subscribe@linkis.apache.org" target="_blank" rel="noopener noreferrer" class="footer__link-item">订阅邮件</a></li><li class="footer__item"><a href="https://lists.apache.org/list.html?dev@linkis.apache.org" target="_blank" rel="noopener noreferrer" class="footer__link-item">邮件归档</a></li></ul></div></div><div class="footer__bottom text--center"><div class="footer__copyright"><div style="text-align: left;"> |
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