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<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>How to develop Pulsar connectors · Apache Pulsar</title><meta name="viewport" content="width=device-width, initial-scale=1.0"/><meta name="generator" content="Docusaurus"/><meta name="description" content="This guide describes how to develop Pulsar connectors to move data"/><meta name="docsearch:version" content="2.6.3"/><meta name="docsearch:language" content="en"/><meta property="og:title" content="How to develop Pulsar connectors · Apache Pulsar"/><meta property="og:type" content="website"/><meta property="og:url" content="https://pulsar.apache.org/"/><meta property="og:description" content="This guide describes how to develop Pulsar connectors to move data"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://pulsar.apache.org/img/pulsar.svg"/><link rel="shortcut icon" href="/img/pulsar.ico"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/atom-one-dark.min.css"/><link rel="alternate" type="application/atom+xml" href="https://pulsar.apache.org/blog/atom.xml" title="Apache Pulsar Blog ATOM Feed"/><link rel="alternate" type="application/rss+xml" href="https://pulsar.apache.org/blog/feed.xml" title="Apache Pulsar Blog RSS Feed"/><link rel="stylesheet" href="/css/code-blocks-buttons.css"/><script type="text/javascript" src="https://buttons.github.io/buttons.js"></script><script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/clipboard.js/2.0.0/clipboard.min.js"></script><script type="text/javascript" src="/js/custom.js"></script><script src="/js/scrollSpy.js"></script><link rel="stylesheet" href="/css/main.css"/><script src="/js/codetabs.js"></script></head><body class="sideNavVisible separateOnPageNav"><div class="fixedHeaderContainer"><div class="headerWrapper wrapper"><header><a href="/en"><img class="logo" src="/img/pulsar.svg" alt="Apache Pulsar"/></a><a href="/en/versions"><h3>2.6.3</h3></a><div class="navigationWrapper navigationSlider"><nav class="slidingNav"><ul class="nav-site nav-site-internal"><li class="siteNavGroupActive"><a href="/docs/en/2.6.3/getting-started-standalone" target="_self">Docs</a></li><li class=""><a href="/en/download" target="_self">Download</a></li><li class="siteNavGroupActive"><a href="/docs/en/2.6.3/client-libraries" target="_self">Clients</a></li><li class=""><a href="#restapis" target="_self">REST APIs</a></li><li class=""><a href="#cli" target="_self">Cli</a></li><li class=""><a href="/blog/" target="_self">Blog</a></li><li class=""><a href="#community" target="_self">Community</a></li><li class=""><a href="#apache" target="_self">Apache</a></li><li class=""><a href="https://pulsar-next.staged.apache.org/" target="_self">New Website (Beta)</a></li><span><li><a id="languages-menu" href="#"><img class="languages-icon" src="/img/language.svg" alt="Languages icon"/>English</a><div id="languages-dropdown" class="hide"><ul id="languages-dropdown-items"><li><a href="/docs/ja/2.6.3/io-develop">日本語</a></li><li><a href="/docs/fr/2.6.3/io-develop">Français</a></li><li><a href="/docs/ko/2.6.3/io-develop">한국어</a></li><li><a href="/docs/zh-CN/2.6.3/io-develop">中文</a></li><li><a href="/docs/zh-TW/2.6.3/io-develop">繁體中文</a></li><li><a href="https://crowdin.com/project/apache-pulsar" target="_blank" rel="noreferrer noopener">Help Translate</a></li></ul></div></li><script>
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href="/docs/en/2.6.3/cookbooks-encryption">Encryption</a></li><li class="navListItem"><a class="navItem" href="/docs/en/2.6.3/cookbooks-message-queue">Message queue</a></li><li class="navListItem"><a class="navItem" href="/docs/en/2.6.3/cookbooks-bookkeepermetadata">BookKeeper Ledger Metadata</a></li></ul></div><div class="navGroup"><h3 class="navGroupCategoryTitle">Development</h3><ul class=""><li class="navListItem"><a class="navItem" href="/docs/en/2.6.3/develop-tools">Simulation tools</a></li><li class="navListItem"><a class="navItem" href="/docs/en/2.6.3/developing-binary-protocol">Binary protocol</a></li><li class="navListItem"><a class="navItem" href="/docs/en/2.6.3/develop-schema">Custom schema storage</a></li><li class="navListItem"><a class="navItem" href="/docs/en/2.6.3/develop-load-manager">Modular load manager</a></li><li class="navListItem"><a class="navItem" href="/docs/en/2.6.3/develop-cpp">Building Pulsar C++ client</a></li></ul></div><div class="navGroup"><h3 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</script></nav></div><div class="container mainContainer docsContainer"><div class="wrapper"><div class="post"><header class="postHeader"><a class="edit-page-link button" href="https://github.com/apache/pulsar/edit/master/site2/docs/io-develop.md" target="_blank" rel="noreferrer noopener">Edit</a><h1 id="__docusaurus" class="postHeaderTitle">How to develop Pulsar connectors</h1></header><article><div><span><p>This guide describes how to develop Pulsar connectors to move data
between Pulsar and other systems.</p>
<p>Pulsar connectors are special <a href="/docs/en/2.6.3/functions-overview">Pulsar Functions</a>, so creating
a Pulsar connector is similar to creating a Pulsar function.</p>
<p>Pulsar connectors come in two types:</p>
<table>
<thead>
<tr><th>Type</th><th>Description</th><th>Example</th></tr>
</thead>
<tbody>
<tr><td><a href="https://github.com/apache/pulsar/tree/master//pulsar-io/core/src/main/java/org/apache/pulsar/io/core/Source.java"><code>Source</code></a>
</td><td>Import data from another system to Pulsar.</td><td><a href="/docs/en/2.6.3/io-rabbitmq">RabbitMQ source connector</a> imports the messages of a RabbitMQ queue to a Pulsar topic.</td></tr>
<tr><td><a href="https://github.com/apache/pulsar/tree/master//pulsar-io/core/src/main/java/org/apache/pulsar/io/core/Sink.java"><code>Sink</code></a>
</td><td>Export data from Pulsar to another system.</td><td><a href="/docs/en/2.6.3/io-kinesis">Kinesis sink connector</a> exports the messages of a Pulsar topic to a Kinesis stream.</td></tr>
</tbody>
</table>
<h2><a class="anchor" aria-hidden="true" id="develop"></a><a href="#develop" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Develop</h2>
<p>You can develop Pulsar source connectors and sink connectors.</p>
<h3><a class="anchor" aria-hidden="true" id="source"></a><a href="#source" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Source</h3>
<p>Developing a source connector is to implement the <a href="https://github.com/apache/pulsar/tree/master//pulsar-io/core/src/main/java/org/apache/pulsar/io/core/Source.java"><code>Source</code></a>
interface, which means you need to implement the <a href="https://github.com/apache/pulsar/tree/master//pulsar-io/core/src/main/java/org/apache/pulsar/io/core/Source.java"><code>open</code></a>
method and the <a href="https://github.com/apache/pulsar/tree/master//pulsar-io/core/src/main/java/org/apache/pulsar/io/core/Source.java"><code>read</code></a>
method.</p>
<ol>
<li><p>Implement the <a href="https://github.com/apache/pulsar/tree/master//pulsar-io/core/src/main/java/org/apache/pulsar/io/core/Source.java"><code>open</code></a>
method.</p>
<pre><code class="hljs css language-java"><span class="hljs-comment">/**
* Open connector with configuration
*
* <span class="hljs-doctag">@param</span> config initialization config
* <span class="hljs-doctag">@param</span> sourceContext
* <span class="hljs-doctag">@throws</span> Exception IO type exceptions when opening a connector
*/</span>
<span class="hljs-function"><span class="hljs-keyword">void</span> <span class="hljs-title">open</span><span class="hljs-params">(<span class="hljs-keyword">final</span> Map&lt;String, Object&gt; config, SourceContext sourceContext)</span> <span class="hljs-keyword">throws</span> Exception</span>;
</code></pre>
<p>This method is called when the source connector is initialized.</p>
<p>In this method, you can retrieve all connector specific settings through the passed-in <code>config</code> parameter and initialize all necessary resources.</p>
<p>For example, a Kafka connector can create a Kafka client in this <code>open</code> method.</p>
<p>Besides, Pulsar runtime also provides a <code>SourceContext</code> for the
connector to access runtime resources for tasks like collecting metrics. The implementation can save the <code>SourceContext</code> for future use.</p></li>
<li><p>Implement the <a href="https://github.com/apache/pulsar/tree/master//pulsar-io/core/src/main/java/org/apache/pulsar/io/core/Source.java"><code>read</code></a>
method.</p>
<pre><code class="hljs css language-java"> <span class="hljs-comment">/**
* Reads the next message from source.
* If source does not have any new messages, this call should block.
* <span class="hljs-doctag">@return</span> next message from source. The return result should never be null
* <span class="hljs-doctag">@throws</span> Exception
*/</span>
<span class="hljs-function">Record&lt;T&gt; <span class="hljs-title">read</span><span class="hljs-params">()</span> <span class="hljs-keyword">throws</span> Exception</span>;
</code></pre>
<p>If nothing to return, the implementation should be blocking rather than returning <code>null</code>.</p>
<p>The returned <a href="https://github.com/apache/pulsar/tree/master//pulsar-functions/api-java/src/main/java/org/apache/pulsar/functions/api/Record.java"><code>Record</code></a>
should encapsulate the following information, which is needed by Pulsar IO runtime.</p>
<ul>
<li><p><a href="https://github.com/apache/pulsar/tree/master//pulsar-functions/api-java/src/main/java/org/apache/pulsar/functions/api/Record.java"><code>Record</code></a>
should provide the following variables:</p>
<table>
<thead>
<tr><th>Variable</th><th>Required</th><th>Description</th></tr>
</thead>
<tbody>
<tr><td><code>TopicName</code></td><td>No</td><td>Pulsar topic name from which the record is originated from.</td></tr>
<tr><td><code>Key</code></td><td>No</td><td>Messages can optionally be tagged with keys.<br/><br/>For more information, see <a href="/docs/en/2.6.3/concepts-messaging#routing-modes">Routing modes</a>.</td></tr>
<tr><td><code>Value</code></td><td>Yes</td><td>Actual data of the record.</td></tr>
<tr><td><code>EventTime</code></td><td>No</td><td>Event time of the record from the source.</td></tr>
<tr><td><code>PartitionId</code></td><td>No</td><td>If the record is originated from a partitioned source, it returns its <code>PartitionId</code>. <br/><br/><code>PartitionId</code> is used as a part of the unique identifier by Pulsar IO runtime to deduplicate messages and achieve exactly-once processing guarantee.</td></tr>
<tr><td><code>RecordSequence</code></td><td>No</td><td>If the record is originated from a sequential source, it returns its <code>RecordSequence</code>.<br/><br/><code>RecordSequence</code> is used as a part of the unique identifier by Pulsar IO runtime to deduplicate messages and achieve exactly-once processing guarantee.</td></tr>
<tr><td><code>Properties</code></td><td>No</td><td>If the record carries user-defined properties, it returns those properties.</td></tr>
<tr><td><code>DestinationTopic</code></td><td>No</td><td>Topic to which message should be written.</td></tr>
<tr><td><code>Message</code></td><td>No</td><td>A class which carries data sent by users.<br/><br/>For more information, see <a href="https://github.com/apache/pulsar/blob/master/pulsar-client-api/src/main/java/org/apache/pulsar/client/api/Message.java">Message.java</a>.</td></tr>
</tbody>
</table>
</li>
<li><p><a href="https://github.com/apache/pulsar/tree/master//pulsar-functions/api-java/src/main/java/org/apache/pulsar/functions/api/Record.java"><code>Record</code></a>
should provide the following methods:</p>
<table>
<thead>
<tr><th>Method</th><th>Description</th></tr>
</thead>
<tbody>
<tr><td><code>ack</code></td><td>Acknowledge that the record is fully processed.</td></tr>
<tr><td><code>fail</code></td><td>Indicate that the record fails to be processed.</td></tr>
</tbody>
</table>
</li>
</ul></li>
</ol>
<blockquote>
<h4><a class="anchor" aria-hidden="true" id="tip"></a><a href="#tip" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Tip</h4>
<p>For more information about <strong>how to create a source connector</strong>, see <a href="https://github.com/apache/pulsar/tree/master//pulsar-io/kafka/src/main/java/org/apache/pulsar/io/kafka/KafkaAbstractSource.java"><code>KafkaSource</code></a>
.</p>
</blockquote>
<h3><a class="anchor" aria-hidden="true" id="sink"></a><a href="#sink" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Sink</h3>
<p>Developing a sink connector <strong>is similar to</strong> developing a source connector, that is, you need to implement the <a href="https://github.com/apache/pulsar/tree/master//pulsar-io/core/src/main/java/org/apache/pulsar/io/core/Sink.java"><code>Sink</code></a>
interface, which means implementing the <a href="https://github.com/apache/pulsar/tree/master//pulsar-io/core/src/main/java/org/apache/pulsar/io/core/Sink.java"><code>open</code></a>
method and the <a href="https://github.com/apache/pulsar/tree/master//pulsar-io/core/src/main/java/org/apache/pulsar/io/core/Sink.java"><code>write</code></a>
method.</p>
<ol>
<li><p>Implement the <a href="https://github.com/apache/pulsar/tree/master//pulsar-io/core/src/main/java/org/apache/pulsar/io/core/Sink.java"><code>open</code></a>
method.</p>
<pre><code class="hljs css language-java"> <span class="hljs-comment">/**
* Open connector with configuration
*
* <span class="hljs-doctag">@param</span> config initialization config
* <span class="hljs-doctag">@param</span> sinkContext
* <span class="hljs-doctag">@throws</span> Exception IO type exceptions when opening a connector
*/</span>
<span class="hljs-function"><span class="hljs-keyword">void</span> <span class="hljs-title">open</span><span class="hljs-params">(<span class="hljs-keyword">final</span> Map&lt;String, Object&gt; config, SinkContext sinkContext)</span> <span class="hljs-keyword">throws</span> Exception</span>;
</code></pre></li>
<li><p>Implement the <a href="https://github.com/apache/pulsar/tree/master//pulsar-io/core/src/main/java/org/apache/pulsar/io/core/Sink.java"><code>write</code></a>
method.</p>
<pre><code class="hljs css language-java"> <span class="hljs-comment">/**
* Write a message to Sink
* <span class="hljs-doctag">@param</span> record record to write to sink
* <span class="hljs-doctag">@throws</span> Exception
*/</span>
<span class="hljs-function"><span class="hljs-keyword">void</span> <span class="hljs-title">write</span><span class="hljs-params">(Record&lt;T&gt; record)</span> <span class="hljs-keyword">throws</span> Exception</span>;
</code></pre>
<p>During the implementation, you can decide how to write the <code>Value</code> and
the <code>Key</code> to the actual source, and leverage all the provided information such as
<code>PartitionId</code> and <code>RecordSequence</code> to achieve different processing guarantees.</p>
<p>You also need to ack records (if messages are sent successfully) or fail records (if messages fail to send).</p></li>
</ol>
<h2><a class="anchor" aria-hidden="true" id="test"></a><a href="#test" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Test</h2>
<p>Testing connectors can be challenging because Pulsar IO connectors interact with two systems
that may be difficult to mock—Pulsar and the system to which the connector is connecting.</p>
<p>It is
recommended writing special tests to test the connector functionalities as below
while mocking the external service.</p>
<h3><a class="anchor" aria-hidden="true" id="unit-test"></a><a href="#unit-test" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Unit test</h3>
<p>You can create unit tests for your connector.</p>
<h3><a class="anchor" aria-hidden="true" id="integration-test"></a><a href="#integration-test" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Integration test</h3>
<p>Once you have written sufficient unit tests, you can add
separate integration tests to verify end-to-end functionality.</p>
<p>Pulsar uses
<a href="https://www.testcontainers.org/">testcontainers</a> <strong>for all integration tests</strong>.</p>
<blockquote>
<h4><a class="anchor" aria-hidden="true" id="tip-1"></a><a href="#tip-1" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Tip</h4>
<p>For more information about <strong>how to create integration tests for Pulsar connectors</strong>, see <a href="https://github.com/apache/pulsar/tree/master//tests/integration/src/test/java/org/apache/pulsar/tests/integration/io"><code>IntegrationTests</code></a>
.</p>
</blockquote>
<h2><a class="anchor" aria-hidden="true" id="package"></a><a href="#package" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Package</h2>
<p>Once you've developed and tested your connector, you need to package it so that it can be submitted
to a <a href="/docs/en/2.6.3/functions-overview">Pulsar Functions</a> cluster.</p>
<p>There are two methods to
work with Pulsar Functions' runtime, that is, <a href="#nar">NAR</a> and <a href="#uber-jar">uber JAR</a>.</p>
<blockquote>
<h4><a class="anchor" aria-hidden="true" id="note"></a><a href="#note" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Note</h4>
<p>If you plan to package and distribute your connector for others to use, you are obligated to
license and copyright your own code properly. Remember to add the license and copyright to
all libraries your code uses and to your distribution.</p>
<p>If you use the <a href="#nar">NAR</a> method, the NAR plugin
automatically creates a <code>DEPENDENCIES</code> file in the generated NAR package, including the proper
licensing and copyrights of all libraries of your connector.</p>
</blockquote>
<h3><a class="anchor" aria-hidden="true" id="nar"></a><a href="#nar" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>NAR</h3>
<p><strong>NAR</strong> stands for NiFi Archive, which is a custom packaging mechanism used by Apache NiFi, to provide
a bit of Java ClassLoader isolation.</p>
<blockquote>
<h4><a class="anchor" aria-hidden="true" id="tip-2"></a><a href="#tip-2" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Tip</h4>
<p>For more information about <strong>how NAR works</strong>, see
<a href="https://medium.com/hashmapinc/nifi-nar-files-explained-14113f7796fd">here</a>.</p>
</blockquote>
<p>Pulsar uses the same mechanism for packaging <strong>all</strong> <a href="io-connectors">built-in connectors</a>.</p>
<p>The easiest approach to package a Pulsar connector is to create a NAR package using
<a href="https://mvnrepository.com/artifact/org.apache.nifi/nifi-nar-maven-plugin">nifi-nar-maven-plugin</a>.</p>
<p>Include this <a href="https://mvnrepository.com/artifact/org.apache.nifi/nifi-nar-maven-plugin">nifi-nar-maven-plugin</a> in your maven project for your connector as below.</p>
<pre><code class="hljs css language-xml"><span class="hljs-tag">&lt;<span class="hljs-name">plugins</span>&gt;</span>
<span class="hljs-tag">&lt;<span class="hljs-name">plugin</span>&gt;</span>
<span class="hljs-tag">&lt;<span class="hljs-name">groupId</span>&gt;</span>org.apache.nifi<span class="hljs-tag">&lt;/<span class="hljs-name">groupId</span>&gt;</span>
<span class="hljs-tag">&lt;<span class="hljs-name">artifactId</span>&gt;</span>nifi-nar-maven-plugin<span class="hljs-tag">&lt;/<span class="hljs-name">artifactId</span>&gt;</span>
<span class="hljs-tag">&lt;<span class="hljs-name">version</span>&gt;</span>1.2.0<span class="hljs-tag">&lt;/<span class="hljs-name">version</span>&gt;</span>
<span class="hljs-tag">&lt;/<span class="hljs-name">plugin</span>&gt;</span>
<span class="hljs-tag">&lt;/<span class="hljs-name">plugins</span>&gt;</span>
</code></pre>
<p>You must also create a <code>resources/META-INF/services/pulsar-io.yaml</code> file with the following contents:</p>
<pre><code class="hljs css language-yaml"><span class="hljs-attr">name:</span> <span class="hljs-string">connector</span> <span class="hljs-string">name</span>
<span class="hljs-attr">description:</span> <span class="hljs-string">connector</span> <span class="hljs-string">description</span>
<span class="hljs-attr">sourceClass:</span> <span class="hljs-string">fully</span> <span class="hljs-string">qualified</span> <span class="hljs-string">class</span> <span class="hljs-string">name</span> <span class="hljs-string">(only</span> <span class="hljs-string">if</span> <span class="hljs-string">source</span> <span class="hljs-string">connector)</span>
<span class="hljs-attr">sinkClass:</span> <span class="hljs-string">fully</span> <span class="hljs-string">qualified</span> <span class="hljs-string">class</span> <span class="hljs-string">name</span> <span class="hljs-string">(only</span> <span class="hljs-string">if</span> <span class="hljs-string">sink</span> <span class="hljs-string">connector)</span>
</code></pre>
<p>For Gradle users, there is a <a href="https://plugins.gradle.org/plugin/io.github.lhotari.gradle-nar-plugin">Gradle Nar plugin available on the Gradle Plugin Portal</a>.</p>
<blockquote>
<h4><a class="anchor" aria-hidden="true" id="tip-3"></a><a href="#tip-3" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Tip</h4>
<p>For more information about an <strong>how to use NAR for Pulsar connectors</strong>, see <a href="https://github.com/apache/pulsar/tree/master//pulsar-io/twitter/pom.xml"><code>TwitterFirehose</code></a>
.</p>
</blockquote>
<h3><a class="anchor" aria-hidden="true" id="uber-jar"></a><a href="#uber-jar" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Uber JAR</h3>
<p>An alternative approach is to create an <strong>uber JAR</strong> that contains all of the connector's JAR files
and other resource files. No directory internal structure is necessary.</p>
<p>You can use <a href="https://maven.apache.org/plugins/maven-shade-plugin/examples/includes-excludes.html">maven-shade-plugin</a> to create a uber JAR as below:</p>
<pre><code class="hljs css language-xml"><span class="hljs-tag">&lt;<span class="hljs-name">plugin</span>&gt;</span>
<span class="hljs-tag">&lt;<span class="hljs-name">groupId</span>&gt;</span>org.apache.maven.plugins<span class="hljs-tag">&lt;/<span class="hljs-name">groupId</span>&gt;</span>
<span class="hljs-tag">&lt;<span class="hljs-name">artifactId</span>&gt;</span>maven-shade-plugin<span class="hljs-tag">&lt;/<span class="hljs-name">artifactId</span>&gt;</span>
<span class="hljs-tag">&lt;<span class="hljs-name">version</span>&gt;</span>3.1.1<span class="hljs-tag">&lt;/<span class="hljs-name">version</span>&gt;</span>
<span class="hljs-tag">&lt;<span class="hljs-name">executions</span>&gt;</span>
<span class="hljs-tag">&lt;<span class="hljs-name">execution</span>&gt;</span>
<span class="hljs-tag">&lt;<span class="hljs-name">phase</span>&gt;</span>package<span class="hljs-tag">&lt;/<span class="hljs-name">phase</span>&gt;</span>
<span class="hljs-tag">&lt;<span class="hljs-name">goals</span>&gt;</span>
<span class="hljs-tag">&lt;<span class="hljs-name">goal</span>&gt;</span>shade<span class="hljs-tag">&lt;/<span class="hljs-name">goal</span>&gt;</span>
<span class="hljs-tag">&lt;/<span class="hljs-name">goals</span>&gt;</span>
<span class="hljs-tag">&lt;<span class="hljs-name">configuration</span>&gt;</span>
<span class="hljs-tag">&lt;<span class="hljs-name">filters</span>&gt;</span>
<span class="hljs-tag">&lt;<span class="hljs-name">filter</span>&gt;</span>
<span class="hljs-tag">&lt;<span class="hljs-name">artifact</span>&gt;</span>*:*<span class="hljs-tag">&lt;/<span class="hljs-name">artifact</span>&gt;</span>
<span class="hljs-tag">&lt;/<span class="hljs-name">filter</span>&gt;</span>
<span class="hljs-tag">&lt;/<span class="hljs-name">filters</span>&gt;</span>
<span class="hljs-tag">&lt;/<span class="hljs-name">configuration</span>&gt;</span>
<span class="hljs-tag">&lt;/<span class="hljs-name">execution</span>&gt;</span>
<span class="hljs-tag">&lt;/<span class="hljs-name">executions</span>&gt;</span>
<span class="hljs-tag">&lt;/<span class="hljs-name">plugin</span>&gt;</span>
</code></pre>
</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/en/2.6.3/io-cdc"><span class="arrow-prev">← </span><span>CDC connector</span></a><a class="docs-next button" href="/docs/en/2.6.3/io-cli"><span>CLI</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#develop">Develop</a><ul class="toc-headings"><li><a href="#source">Source</a></li><li><a href="#sink">Sink</a></li></ul></li><li><a href="#test">Test</a><ul class="toc-headings"><li><a href="#unit-test">Unit test</a></li><li><a href="#integration-test">Integration test</a></li></ul></li><li><a href="#package">Package</a><ul class="toc-headings"><li><a href="#nar">NAR</a></li><li><a href="#uber-jar">Uber JAR</a></li></ul></li></ul></nav></div><footer class="nav-footer" id="footer"><section class="copyright">Copyright © 2022 The Apache Software Foundation. All Rights Reserved. Apache, Apache Pulsar and the Apache feather logo are trademarks of The Apache Software Foundation.</section><span><script>
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