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docker image</a></li></ul></nav></div></div></aside><main class="docMainContainer_TBSr"><div class="container padding-top--md padding-bottom--lg"><div class="row"><div class="col docItemCol_VOVn"><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_YNFT"><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 itemscope="" itemprop="itemListElement" itemtype="https://schema.org/ListItem" class="breadcrumbs__item breadcrumbs__item--active"><span class="breadcrumbs__link" itemprop="name">Adding an operator in Wayang</span><meta itemprop="position" content="1"></li></ul></nav><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"><h1>Adding new operators in Wayang</h1> | |
| <p>This guide shows the <em>3 steps</em> that developers need to follow if they want to add new operators in Wayang. | |
| We use the Map operator as an example.</p> | |
| <h2 class="anchor anchorWithStickyNavbar_LWe7" id="step-1-add-a-wayang-operator">Step 1: Add a Wayang operator<a href="#step-1-add-a-wayang-operator" class="hash-link" aria-label="Direct link to Step 1: Add a Wayang operator" title="Direct link to Step 1: Add a Wayang operator"></a></h2> | |
| <p>Wayang operators are located under the <code>wayang-basic</code> in the <code>org.apache.wayang.basic.operators</code> package. <br> | |
| An operator needs to extend from one of the following abstract classes: <code>UnaryToUnaryOperator</code>, <code>BinaryToUnaryOperator</code>, <code>UnarySource</code>, <code>UnarySink</code>.<br> | |
| For a unary to unary operator, see for example <a href="https://github.com/apache/incubator-wayang/blob/main/wayang-commons/wayang-basic/src/main/java/org/apache/wayang/basic/operators/MapOperator.java" target="_blank" rel="noopener noreferrer">here</a>.</p> | |
| <p>For enhanced performance in Wayang, consider adding a cardinality estimator by overriding the <code>createCardinalityEstimator()</code> function as <a href="https://github.com/apache/incubator-wayang/blob/main/wayang-commons/wayang-basic/src/main/java/org/apache/wayang/basic/operators/MapOperator.java#L112C43-L112C70" target="_blank" rel="noopener noreferrer">here</a>.</p> | |
| <h2 class="anchor anchorWithStickyNavbar_LWe7" id="step-2-add-the-platform-specific-execution-operators">Step 2: Add the (platform-specific) execution operators<a href="#step-2-add-the-platform-specific-execution-operators" class="hash-link" aria-label="Direct link to Step 2: Add the (platform-specific) execution operators" title="Direct link to Step 2: Add the (platform-specific) execution operators"></a></h2> | |
| <p>Execution operators are located under the corresponding module of <code>wayang-platforms</code>. For instance, Java execution operators are located in the <code>org.apache.wayang.java.operators</code> package of the <code>wayang-java</code> module.<br> | |
| An execution operator needs to extend from its corresponding Wayang operator and implement the corresponding platform operator interface.<br> | |
| For the above <code>MapOperator</code>, the following is the corresponding <a href="https://github.com/apache/incubator-wayang/blob/main/wayang-platforms/wayang-java/src/main/java/org/apache/wayang/java/operators/JavaMapOperator.java" target="_blank" rel="noopener noreferrer"><code>JavaMapOperator</code></a>.</p> | |
| <p>For enhanced performance in Wayang, consider adding a load function as well:<br> | |
| For this you need to overwrite the <code>getLoadProfileEstimatorConfigurationKey()</code> function and provide the right key that will then be read from a properties file. | |
| For the JavaMapOperator it's: wayang.java.map.load. Then add in the corresponding properties file (e.g., <a href="https://github.com/apache/incubator-wayang/blob/main/wayang-platforms/wayang-java/src/main/resources/wayang-java-defaults.properties" target="_blank" rel="noopener noreferrer">this</a> is for the java executor) the template which is the mathematical formula that represents the cost of this operator and an instantiation of it. See <a href="https://github.com/apache/incubator-wayang/blob/main/wayang-platforms/wayang-java/src/main/resources/wayang-java-defaults.properties#L25" target="_blank" rel="noopener noreferrer">here</a> for the example of the map operator.</p> | |
| <h2 class="anchor anchorWithStickyNavbar_LWe7" id="step-3-add-mappings">Step 3: Add mappings<a href="#step-3-add-mappings" class="hash-link" aria-label="Direct link to Step 3: Add mappings" title="Direct link to Step 3: Add mappings"></a></h2> | |
| <p>Create mappings from the Wayang operator to the platform-specific execution operators. <br> | |
| The mappings are located in the corresponding execution module in the <code>org.apache.wayang.java.operators</code> package.<br> | |
| For the above <code>MapOperator</code> and <code>JavaMapOperator</code>, see <a href="https://github.com/apache/incubator-wayang/blob/main/wayang-platforms/wayang-java/src/main/java/org/apache/wayang/java/mapping/MapMapping.java" target="_blank" rel="noopener noreferrer">here</a>.</p> | |
| <p>After that you need to declare this mapping in Wayang in the corresponding <a href="https://github.com/apache/incubator-wayang/blob/main/wayang-platforms/wayang-java/src/main/java/org/apache/wayang/java/mapping/Mappings.java#L37" target="_blank" rel="noopener noreferrer"><code>Mappings</code></a> class.</p> | |
| <h2 class="anchor anchorWithStickyNavbar_LWe7" id="step-4-expand-the-java-scala-like-api">Step 4: Expand the Java scala-like API<a href="#step-4-expand-the-java-scala-like-api" class="hash-link" aria-label="Direct link to Step 4: Expand the Java scala-like API" title="Direct link to Step 4: Expand the Java scala-like API"></a></h2> | |
| <p>Once you created a new operator you need to expose it to the API so that users can use it as a function in the dataflow job they create. For this, you need to go to the module <code>wayang-api/wayang-api-scala-java</code> and expand the <code>JavaPlanBuilder.scala</code> file to include a new source operator or the <code>DataQuantaBuilder</code> for non-source operators.</p></div></article><nav class="pagination-nav docusaurus-mt-lg" aria-label="Docs pages"><a class="pagination-nav__link pagination-nav__link--prev" href="/docs/guide/developing-in-wayang"><div class="pagination-nav__sublabel">Previous</div><div class="pagination-nav__label">Developing in Wayang</div></a><a class="pagination-nav__link pagination-nav__link--next" href="/docs/guide/optimizer"><div class="pagination-nav__sublabel">Next</div><div class="pagination-nav__label">Data processing optimizer</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="#step-1-add-a-wayang-operator" class="table-of-contents__link toc-highlight">Step 1: Add a Wayang operator</a></li><li><a href="#step-2-add-the-platform-specific-execution-operators" class="table-of-contents__link toc-highlight">Step 2: Add the (platform-specific) execution operators</a></li><li><a href="#step-3-add-mappings" class="table-of-contents__link toc-highlight">Step 3: Add mappings</a></li><li><a href="#step-4-expand-the-java-scala-like-api" class="table-of-contents__link toc-highlight">Step 4: Expand the Java scala-like API</a></li></ul></div></div></div></div></main></div></div></div><footer class="footer footer--dark"><div class="container container-fluid"><div class="row footer__links"><div class="col footer__col"><div class="footer__title">Community</div><ul class="footer__items clean-list"><li class="footer__item"><a href="https://lists.apache.org/list.html?dev@wayang.apache.org" target="_blank" rel="noopener noreferrer" class="footer__link-item">Mailing list<svg width="13.5" height="13.5" aria-hidden="true" viewBox="0 0 24 24" 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