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alert--warning margin-bottom--md" role="alert"><div>This is documentation for <!-- -->Apache Linkis<!-- --> <b>1.0.2</b>, which is no longer actively maintained.</div><div class="margin-top--md">For up-to-date documentation, see the <b><a href="/docs/latest/architecture/public_enhancement_services/context_service/context_service_highavailable">latest version</a></b> (<!-- -->1.1.2<!-- -->).</div></div><div class="docItemContainer_oiyr"><article><span class="theme-doc-version-badge badge badge--secondary">Version: <!-- -->1.0.2</span><div class="tocCollapsible_aw-L theme-doc-toc-mobile tocMobile_Tx6Y"><button type="button" class="clean-btn tocCollapsibleButton_zr6a">On this page</button></div><div class="theme-doc-markdown markdown"><header><h1>CS HA Design</h1></header><h2><a aria-hidden="true" tabindex="-1" class="anchor anchor__h2 anchorWithStickyNavbar_y2LR" id="cs-ha-architecture-design"></a><strong>CS HA Architecture Design</strong><a class="hash-link" href="#cs-ha-architecture-design" title="Direct link to heading">#</a></h2><h3><a aria-hidden="true" tabindex="-1" class="anchor anchor__h3 anchorWithStickyNavbar_y2LR" id="1-cs-ha-architecture-summary"></a>1, CS HA architecture summary<a class="hash-link" href="#1-cs-ha-architecture-summary" title="Direct link to heading">#</a></h3><h4><a aria-hidden="true" tabindex="-1" class="anchor anchor__h4 anchorWithStickyNavbar_y2LR" id="1-cs-ha-architecture-diagram"></a>(1) CS HA architecture diagram<a class="hash-link" href="#1-cs-ha-architecture-diagram" title="Direct link to heading">#</a></h4><p><img src="/assets/images/linkis-contextservice-ha-01-8d53a160ccc35de3efa7058995e3b8f5.png"></p><h4><a aria-hidden="true" tabindex="-1" class="anchor anchor__h4 anchorWithStickyNavbar_y2LR" id="2-problems-to-be-solved"></a>(2) Problems to be solved<a class="hash-link" href="#2-problems-to-be-solved" title="Direct link to heading">#</a></h4><p>-HA of Context instance object</p><p>-Client generates CSID request when creating workflow</p><p>-List of aliases of CS Server</p><p>-Unified CSID generation and analysis rules</p><h4><a aria-hidden="true" tabindex="-1" class="anchor anchor__h4 anchorWithStickyNavbar_y2LR" id="3-main-design-ideas"></a>(3) Main design ideas<a class="hash-link" href="#3-main-design-ideas" title="Direct link to heading">#</a></h4><p>① Load balancing</p><p>When the client creates a new workflow, it randomly requests the HA module of a certain server to generate a new HAID with equal probability. The HAID information includes the main server information (hereinafter referred to as the main instance), and the candidate instance, where the candidate instance is The instance with the lowest load among the remaining servers, and a corresponding ContextID. The generated HAID is bound to the workflow and is persisted to the database, and then all change operation requests of the workflow will be sent to the main instance to achieve uniform load distribution.</p><p>②High availability</p><p>In subsequent operations, when the client or gateway determines that the main instance is unavailable, the operation request is forwarded to the standby instance for processing, thereby achieving high service availability. The HA module of the standby instance will first verify the validity of the request based on the HAID information.</p><p>③Alias mechanism</p><p>The alias mechanism is adopted for the machine, the Instance information contained in the HAID adopts a custom alias, and the alias mapping queue is maintained in the background. It is that the client uses HAID when interacting with other components in the background, and uses ContextID when interacting with other components in the background. When implementing specific operations, a dynamic proxy mechanism is used to convert HAID to ContextID for processing.</p><h3><a aria-hidden="true" tabindex="-1" class="anchor anchor__h3 anchorWithStickyNavbar_y2LR" id="2-module-design"></a>2, module design<a class="hash-link" href="#2-module-design" title="Direct link to heading">#</a></h3><h4><a aria-hidden="true" tabindex="-1" class="anchor anchor__h4 anchorWithStickyNavbar_y2LR" id="1-module-diagram"></a>(1) Module diagram<a class="hash-link" href="#1-module-diagram" title="Direct link to heading">#</a></h4><p><img src="/assets/images/linkis-contextservice-ha-02-9971bf8fd601ded6ece61eac35587e87.png"></p><h4><a aria-hidden="true" tabindex="-1" class="anchor anchor__h4 anchorWithStickyNavbar_y2LR" id="2-specific-modules"></a>(2) Specific modules<a class="hash-link" href="#2-specific-modules" title="Direct link to heading">#</a></h4><p>①ContextHAManager module</p><p>Provide interface for CS Server to call to generate CSID and HAID, and provide alias conversion interface based on dynamic proxy;</p><p>Call the persistence module interface to persist CSID information;</p><p>②AbstractContextHAManager module</p><p>The abstraction of ContextHAManager can support the realization of multiple ContextHAManager;</p><p>③InstanceAliasManager module</p><p>RPC module provides Instance and alias conversion interface, maintains alias mapping queue, and provides alias and CS |
| Server instance query; provide an interface to verify whether the host is valid;</p><p>④HAContextIDGenerator module</p><p>Generate a new HAID and encapsulate it into the client's agreed format and return it to the client. The HAID structure is as follows:</p><p>\${length of first instance}\${length of second instance}{instance alias 1} {instance alias 2} {actual ID}, the actual ID is set as ContextID |
| Key;</p><p>⑤ContextHAChecker module</p><p>Provide HAID verification interface. Each request received will verify whether the ID format is valid, and whether the current host is the primary instance or the secondary instance: if it is the primary instance, the verification is passed; if it is the secondary instance, verify whether the primary instance is invalid and the primary instance is invalid The verification is passed.</p><p>⑥BackupInstanceGenerator module</p><p>Generate a backup instance and attach it to the CSID information;</p><p>⑦MultiTenantBackupInstanceGenerator interface</p><p>(Reserved interface, not implemented yet)</p><h3><a aria-hidden="true" tabindex="-1" class="anchor anchor__h3 anchorWithStickyNavbar_y2LR" id="3-uml-class-diagram"></a>3. UML Class Diagram<a class="hash-link" href="#3-uml-class-diagram" title="Direct link to heading">#</a></h3><p><img src="/assets/images/linkis-contextservice-ha-03-475fca11203bd6af5a18568a7d4a7868.png"></p><h3><a aria-hidden="true" tabindex="-1" class="anchor anchor__h3 anchorWithStickyNavbar_y2LR" id="4-ha-module-operation-sequence-diagram"></a>4. HA module operation sequence diagram<a class="hash-link" href="#4-ha-module-operation-sequence-diagram" title="Direct link to heading">#</a></h3><p><img src="/assets/images/linkis-contextservice-ha-04-28863b2ccc23df1b509ee9906d0596b6.png"></p><p>CSID generated for the first time: |
| The client sends a request, and the Gateway forwards it to any server. The HA module generates the HAID, including the main instance, the backup instance and the CSID, and completes the binding of the workflow and the HAID.</p><p>When the client sends a change request, Gateway determines that the main Instance is invalid, and then forwards the request to the standby Instance for processing. After the instance on the standby Instance verifies that the HAID is valid, it loads the instance and processes the request.</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/versioned_docs/version-1.0.2/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>Edit this page</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="/docs/1.0.2/architecture/public_enhancement_services/context_service/context_service_client"><div class="pagination-nav__sublabel">Previous</div><div class="pagination-nav__label">« <!-- -->CS Client Design</div></a></div><div class="pagination-nav__item pagination-nav__item--next"><a class="pagination-nav__link" href="/docs/1.0.2/architecture/public_enhancement_services/context_service/context_service_listener"><div class="pagination-nav__sublabel">Next</div><div class="pagination-nav__label">CS Listener Architecture<!-- --> »</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-architecture-design" class="table-of-contents__link"><strong>CS HA Architecture Design</strong></a><ul><li><a href="#1-cs-ha-architecture-summary" class="table-of-contents__link">1, CS HA architecture summary</a></li><li><a href="#2-module-design" class="table-of-contents__link">2, module design</a></li><li><a href="#3-uml-class-diagram" class="table-of-contents__link">3. 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