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page</button></div><div class="theme-doc-markdown markdown"><header><h1>CS HA 架构设计</h1></header><h2><a aria-hidden="true" tabindex="-1" class="anchor anchor__h2 anchorWithStickyNavbar_y2LR" id="cs-ha架构设计"></a><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><a aria-hidden="true" tabindex="-1" class="anchor anchor__h3 anchorWithStickyNavbar_y2LR" id="1cs-ha架构概要"></a>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><a aria-hidden="true" tabindex="-1" class="anchor anchor__h4 anchorWithStickyNavbar_y2LR" id="1cs-ha架构图"></a>（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 src="/zh-CN/assets/images/linkis-contextservice-ha-01-67188a52f5dc0ac74a4431b9a86ca80c.png"></p><h4><a aria-hidden="true" tabindex="-1" class="anchor anchor__h4 anchorWithStickyNavbar_y2LR" id="2要解决的问题"></a>（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><a aria-hidden="true" tabindex="-1" class="anchor anchor__h4 anchorWithStickyNavbar_y2LR" id="3主要设计思路"></a>（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。在于客户端交互时采用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><a aria-hidden="true" tabindex="-1" class="anchor anchor__h3 anchorWithStickyNavbar_y2LR" id="2模块设计"></a>2，模块设计<a class="hash-link" href="#2模块设计" title="Direct link to heading">#</a></h3><h4><a aria-hidden="true" tabindex="-1" class="anchor anchor__h4 anchorWithStickyNavbar_y2LR" id="1模块图"></a>（1）模块图<a class="hash-link" href="#1模块图" title="Direct link to heading">#</a></h4><p><img src="/zh-CN/assets/images/linkis-contextservice-ha-02-9971bf8fd601ded6ece61eac35587e87.png"></p><h4><a aria-hidden="true" tabindex="-1" class="anchor anchor__h4 anchorWithStickyNavbar_y2LR" id="2具体模块"></a>（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><a aria-hidden="true" tabindex="-1" class="anchor anchor__h3 anchorWithStickyNavbar_y2LR" id="3-uml类图"></a>3. UML类图<a class="hash-link" href="#3-uml类图" title="Direct link to heading">#</a></h3><p><img src="/zh-CN/assets/images/linkis-contextservice-ha-03-d732b58d7da28dc28bc6f909140dd15e.png"></p><h3><a aria-hidden="true" tabindex="-1" class="anchor anchor__h3 anchorWithStickyNavbar_y2LR" id="4-ha模块操作时序图"></a>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 src="/zh-CN/assets/images/linkis-contextservice-ha-04-d13009eb9671bd60c9ff019ff7ba6995.png"></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/incubator-linkis-website/edit/dev/i18n/zh-CN/docusaurus-plugin-content-docs/version-1.1.0/architecture/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_mS5F" 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_mt2f"></div></div></footer></article><nav class="pagination-nav docusaurus-mt-lg" aria-label="Docs pages navigation"><div class="pagination-nav__item"><a class="pagination-nav__link" href="/zh-CN/docs/1.1.0/architecture/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></div><div class="pagination-nav__item pagination-nav__item--next"><a class="pagination-nav__link" href="/zh-CN/docs/1.1.0/architecture/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></div></nav></div></div><div class="col col--3"><div class="tableOfContents_vrFS thin-scrollbar"><ul class="table-of-contents table-of-contents__left-border"><li><a href="#cs-ha架构设计" class="table-of-contents__link"><strong>CS HA架构设计</strong></a><ul><li><a href="#1cs-ha架构概要" class="table-of-contents__link">1，CS HA架构概要</a></li><li><a href="#2模块设计" class="table-of-contents__link">2，模块设计</a></li><li><a href="#3-uml类图" class="table-of-contents__link">3. 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