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class="docMainContainer_gTbr"><div class="container padding-top--md padding-bottom--lg"><div class="row"><div class="col docItemCol_VOVn"><div class="theme-doc-version-banner alert alert--warning margin-bottom--md" role="alert"><div>This is documentation for <!-- -->Apache Linkis<!-- --> <b>1.2.0</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, which is no longer actively maintained.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/about/introduction">latest version</a></b> (<!-- -->1.5.0<!-- -->).</div></div><div class="docItemContainer_Djhp"><article><nav class="theme-doc-breadcrumbs breadcrumbsContainer_Z_bl" aria-label="Breadcrumbs"><ul class="breadcrumbs" itemscope="" itemtype="https://schema.org/BreadcrumbList"><li class="breadcrumbs__item"><a aria-label="Home page" class="breadcrumbs__link" href="/"><svg viewBox="0 0 24 24" class="breadcrumbHomeIcon_OVgt"><path d="M10 19v-5h4v5c0 .55.45 1 1 1h3c.55 0 1-.45 1-1v-7h1.7c.46 0 .68-.57.33-.87L12.67 3.6c-.38-.34-.96-.34-1.34 0l-8.36 7.53c-.34.3-.13.87.33.87H5v7c0 .55.45 1 1 1h3c.55 0 1-.45 1-1z" fill="currentColor"></path></svg></a></li><li class="breadcrumbs__item"><span class="breadcrumbs__link">Architecture</span><meta itemprop="position" content="1"></li><li class="breadcrumbs__item"><span class="breadcrumbs__link">Public Enhancement Services</span><meta itemprop="position" content="2"></li><li itemscope="" itemprop="itemListElement" itemtype="https://schema.org/ListItem" class="breadcrumbs__item breadcrumbs__item--active"><span class="breadcrumbs__link" itemprop="name">Public Service</span><meta itemprop="position" content="3"></li></ul></nav><span class="theme-doc-version-badge badge badge--secondary">Version: 1.2.0</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>Public Service</h1></header><h2 class="anchor anchorWithStickyNavbar_LWe7" id="background"><strong>Background</strong><a class="hash-link" href="#background" title="Direct link to heading"></a></h2><p>PublicService is a comprehensive service composed of multiple sub-modules such as "configuration", "jobhistory", "udf", "variable", etc. Linkis |
| 1.0 added label management based on version 0.9. Linkis doesn't need to set the parameters every time during the execution of different jobs. |
| Many variables, functions and configurations can be reused after the user completes the settings once, and of course that they can also be shared with other users.</p><h2 class="anchor anchorWithStickyNavbar_LWe7" id="architecture-diagram"><strong>Architecture diagram</strong><a class="hash-link" href="#architecture-diagram" title="Direct link to heading"></a></h2><p><img loading="lazy" alt="Diagram" src="/assets/images/linkis-publicService-01-fe98364417c2879f8c12204e36ef6dfc.png" width="907" height="552" class="img_ev3q"></p><h2 class="anchor anchorWithStickyNavbar_LWe7" id="architecture-introduction"><strong>Architecture Introduction</strong><a class="hash-link" href="#architecture-introduction" title="Direct link to heading"></a></h2><ol><li><p>linkis-configuration：Provides query and save operations for global settings and general settings, especially engine configuration parameters.</p></li><li><p>linkis-jobhistory：Specially used for storage and query of historical execution task, users can obtain the historical tasks through the interface provided by "jobhistory", include logs, status and execution content. |
| At the same time, the historical task also support the paging query operation.The administrator can view all the historical tasks, but the ordinary users can only view their own tasks.</p></li><li><p>Linkis-udf：Provides the user function management capability in Linkis, which can be divided into shared functions, personal functions, system functions and the functions used by engine. |
| Once the user selects one, it will be automatically loaded for users to directly quote in the code and reuse between different scripts when the engine starting. </p></li><li><p>Linkis-variable：Provides the global variable management capability in Linkis, store and query the user-defined global variables。</p></li><li><p>linkis-instance-label：Provides two modules named "label server" and "label client" for labeling Engine and EM. It also provides node-based label addition, deletion, modification and query capabilities. |
| The main functions are as follows:</p></li></ol><ul><li><p>Provides resource management capabilities for some specific labels to assist RM in more refined resource management.</p></li><li><p>Provides labeling capabilities for users. The user label will be automatically added for judgment when applying for the engine. </p></li><li><p>Provides the label analysis module, which can parse the users' request into a bunch of labels。</p></li><li><p>With the ability of node label management, it is mainly used to provide the label CRUD capability of the node and the label resource management to manage the resources of certain labels, marking the maximum resource, minimum resource and used resource of a Label.</p></li></ul></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/versioned_docs/version-1.2.0/architecture/public-enhancement-services/public-service.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>Edit this page</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="/docs/1.2.0/architecture/public-enhancement-services/overview"><div class="pagination-nav__sublabel">Previous</div><div class="pagination-nav__label">Overview</div></a><a class="pagination-nav__link pagination-nav__link--next" href="/docs/1.2.0/architecture/public-enhancement-services/bml/overview"><div class="pagination-nav__sublabel">Next</div><div class="pagination-nav__label">Overview</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="#background" class="table-of-contents__link toc-highlight"><strong>Background</strong></a></li><li><a href="#architecture-diagram" class="table-of-contents__link toc-highlight"><strong>Architecture diagram</strong></a></li><li><a href="#architecture-introduction" class="table-of-contents__link toc-highlight"><strong>Architecture Introduction</strong></a></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="/docs/latest/about/introduction">Document</a></li><li class="footer__item"><a class="footer__link-item" href="/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">Releases</a></li></ul></div><div class="col footer__col"><div class="footer__title">Community</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">Subscribe Mailing List</div><ul class="footer__items clean-list"><li class="footer__item"><a class="footer__link-item" href="/community/how-to-subscribe">How to Subscribe</a></li><li class="footer__item"><a href="mailto:dev-subscribe@linkis.apache.org" target="_blank" rel="noopener noreferrer" class="footer__link-item">Subscribe Mail</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">Mail Archive</a></li></ul></div></div><div class="footer__bottom text--center"><div class="footer__copyright"><div><img style="height:50px" alt="Apache Software Foundation" src="/img/incubator-logo.svg"><p style="color: #999999; padding: 0 20px 30px;font-weight:400;text-align:left">Apache Linkis is an effort undergoing incubation at The Apache Software Foundation (ASF), sponsored by the Apache Incubator. 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