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class="sidebar_re4s thin-scrollbar" aria-label="Blog recent posts navigation"><div class="sidebarItemTitle_pO2u margin-bottom--md">All our posts</div><ul class="sidebarItemList_Yudw clean-list"><li class="sidebarItem__DBe"><a class="sidebarItemLink_mo7H" href="/blog/wayang-tensorflow">Integrating ML platforms in Wayang</a></li><li class="sidebarItem__DBe"><a class="sidebarItemLink_mo7H" href="/blog/wayang-federated-ai">Wayang and the Federated AI</a></li><li class="sidebarItem__DBe"><a class="sidebarItemLink_mo7H" href="/blog/wayang-python-api">Pywayang - Apache Wayang's Python API</a></li><li class="sidebarItem__DBe"><a class="sidebarItemLink_mo7H" href="/blog/kafka-meets-wayang-3">Apache Kafka meets Apache Wayang - Part 3</a></li><li class="sidebarItem__DBe"><a class="sidebarItemLink_mo7H" href="/blog/wayang-vs-trino">Apache Wayang vs. Presto/Trino</a></li><li class="sidebarItem__DBe"><a class="sidebarItemLink_mo7H" href="/blog/kafka-meets-wayang-2">Apache Kafka meets Apache Wayang - Part 2</a></li><li class="sidebarItem__DBe"><a class="sidebarItemLink_mo7H" href="/blog/kafka-meets-wayang-1">Apache Kafka meets Apache Wayang - Part 1</a></li><li class="sidebarItem__DBe"><a class="sidebarItemLink_mo7H" href="/blog/website_update">Website updated</a></li></ul></nav></aside><main class="col col--7" itemscope="" itemtype="https://schema.org/Blog"><header class="margin-bottom--xl"><h1>One post tagged with "python"</h1><a href="/blog/tags">View All Tags</a></header><article class="margin-bottom--xl" itemprop="blogPost" itemscope="" itemtype="https://schema.org/BlogPosting"><meta itemprop="description" content="In the vast landscape of data processing, efficiency and flexibility are"><header><h2 class="title_f1Hy" itemprop="headline"><a itemprop="url" href="/blog/wayang-python-api">Pywayang - Apache Wayang's Python API</a></h2><div class="container_mt6G margin-vert--md"><time datetime="2024-04-09T00:00:00.000Z" itemprop="datePublished">April 9, 2024</time> · <!-- -->4 min read</div><div class="margin-top--md margin-bottom--sm row"><div class="col col--6 authorCol_Hf19"><div class="avatar margin-bottom--sm"><a href="https://github.com/juripetersen" target="_blank" rel="noopener noreferrer" class="avatar__photo-link"><img class="avatar__photo" src="https://avatars.githubusercontent.com/u/43411515?v=4" alt="Juri Petersen" itemprop="image"></a><div class="avatar__intro" itemprop="author" itemscope="" itemtype="https://schema.org/Person"><div class="avatar__name"><a href="https://github.com/juripetersen" target="_blank" rel="noopener noreferrer" itemprop="url"><span itemprop="name">Juri Petersen</span></a></div><small class="avatar__subtitle" itemprop="description">Apache Committer</small></div></div></div></div></header><div class="markdown" itemprop="articleBody"><p>In the vast landscape of data processing, efficiency and flexibility are |
| important. However, navigating through a multitude of tools and |
| languages often is a major inconvenience. |
| Apache Wayang's upcoming Python API will allow you to seamlessly |
| orchestrate data processing tasks without ever leaving the comfort |
| of Python, irrespective of the underlying framework written in Java.</p> |
| <h2 class="anchor anchorWithStickyNavbar_LWe7" id="expanding-apache-wayangs-apis">Expanding Apache Wayang's APIs<a href="#expanding-apache-wayangs-apis" class="hash-link" aria-label="Direct link to Expanding Apache Wayang's APIs" title="Direct link to Expanding Apache Wayang's APIs"></a></h2> |
| <p>Apache Wayang's architecture decouples the process of planning from the |
| resulting execution, allowing users to specify platform agnostic plans |
| through the provided APIs.</p> |
| <br> |
| <img width="75%" alt="wayang stack" src="/img/architecture/wayang-stack.png"> |
| <br> |
| <br> |
| <p>Python's popularity and convenience for data |
| processing workloads makes it an obvious candidate for a desired API. |
| Previous APIs, such as the Scala API <code>wayang-api-scala-java</code> benefited |
| from the interoperability of Java and Scala that allows to reuse objects |
| from other languages to provide new interfaces. Accessing JVM objects in |
| Python is possible through several libraries, but in doing so, |
| future APIs in other programming languages would need similar libraries and |
| implementations in order to exist. As a contrast to that, providing an |
| API within Apache Wayang that receives input plans from any source and |
| executes them within allows to create plans and submit them in any |
| programming language. The following figure shows the architecture of <code>pywayang</code>:</p> |
| <br> |
| <img width="75%" alt="pywayang stack" src="/img/architecture/pywayang.png"> |
| <br> |
| <br> |
| <p>The Python API allows users to specify WayangPlans with UDFs in Python. |
| <code>pywayang</code> then serializes the UDFs and constructs the WayangPlan in |
| JSON format, preparing it to be sent to Apache Wayang's JSON API. |
| When receiving a valid JSON plan, the JSON API uses the optimizer to |
| construct an execution plan. However, since UDFs are defined in Python |
| and thus need to be executed in Python as well, an operators function needs to be |
| wrapped into a <code>WrappedPythonFunction</code>:</p> |
| <div class="language-scala codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#393A34;--prism-background-color:#f6f8fa"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-scala codeBlock_bY9V thin-scrollbar" style="color:#393A34;background-color:#f6f8fa"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#393A34"><span class="token keyword" style="color:#00009f">val</span><span class="token plain"> mapOperator </span><span class="token operator" style="color:#393A34">=</span><span class="token plain"> </span><span class="token keyword" style="color:#00009f">new</span><span class="token plain"> MapPartitionsOperator</span><span class="token punctuation" style="color:#393A34">[</span><span class="token plain">Input</span><span class="token punctuation" style="color:#393A34">,</span><span class="token plain"> Output</span><span class="token punctuation" style="color:#393A34">]</span><span class="token punctuation" style="color:#393A34">(</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token keyword" style="color:#00009f">new</span><span class="token plain"> MapPartitionsDescriptor</span><span class="token punctuation" style="color:#393A34">[</span><span class="token plain">Input</span><span class="token punctuation" style="color:#393A34">,</span><span class="token plain"> Output</span><span class="token punctuation" style="color:#393A34">]</span><span class="token punctuation" style="color:#393A34">(</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token keyword" style="color:#00009f">new</span><span class="token plain"> WrappedPythonFunction</span><span class="token punctuation" style="color:#393A34">[</span><span class="token plain">Input</span><span class="token punctuation" style="color:#393A34">,</span><span class="token plain"> Output</span><span class="token punctuation" style="color:#393A34">]</span><span class="token punctuation" style="color:#393A34">(</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> ByteString</span><span class="token punctuation" style="color:#393A34">.</span><span class="token plain">copyFromUtf8</span><span class="token punctuation" style="color:#393A34">(</span><span class="token plain">udf</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">)</span><span class="token punctuation" style="color:#393A34">,</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> classOf</span><span class="token punctuation" style="color:#393A34">[</span><span class="token plain">Input</span><span class="token punctuation" style="color:#393A34">]</span><span class="token punctuation" style="color:#393A34">,</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> classOf</span><span class="token punctuation" style="color:#393A34">[</span><span class="token plain">Output</span><span class="token punctuation" style="color:#393A34">]</span><span class="token punctuation" style="color:#393A34">,</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token punctuation" style="color:#393A34">)</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div> |
| <p>This wrapped functional descriptor allows to handle execution of |
| UDFs in Python through a socket connection with the <code>pywayang</code> worker. |
| Input data is sourced from the platform chosen by the optimizer and Apache |
| Wayang handles routing the output data to the next operator.</p> |
| <br> |
| <p>A new API in any programming languages would have |
| to specify two things:</p> |
| <ul> |
| <li>A way to create plans that conform to a JSON format specified in the |
| Wayang JSON API.</li> |
| <li>A <code>worker</code> that handles encoding and decoding of user defined |
| functions (UDFs), as they need to |
| be executed on iterables in their respective language. |
| After that, the API can be added as a module in Wayang, so that |
| operators will be wrapped and UDFs can be executed in the desired |
| programming language.</li> |
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