<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Pulsar connector overview · Apache Pulsar</title><meta name="viewport" content="width=device-width, initial-scale=1.0"/><meta name="generator" content="Docusaurus"/><meta name="description" content="Messaging systems are most powerful when you can easily use them with external systems like databases and other messaging systems."/><meta name="docsearch:version" content="2.7.4"/><meta name="docsearch:language" content="en"/><meta property="og:title" content="Pulsar connector overview · Apache Pulsar"/><meta property="og:type" content="website"/><meta property="og:url" content="https://pulsar.apache.org/"/><meta property="og:description" content="Messaging systems are most powerful when you can easily use them with external systems like databases and other messaging systems."/><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>2.7.4</h3></a><div class="navigationWrapper navigationSlider"><nav class="slidingNav"><ul class="nav-site nav-site-internal"><li class="siteNavGroupActive"><a href="/docs/en/2.7.4/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/2.7.4/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/2.7.4/io-overview">日本語</a></li><li><a href="/docs/fr/2.7.4/io-overview">Français</a></li><li><a href="/docs/ko/2.7.4/io-overview">한국어</a></li><li><a href="/docs/zh-CN/2.7.4/io-overview">中文</a></li><li><a href="/docs/zh-TW/2.7.4/io-overview">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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Kubernetes</a></li></ul></div><div class="navGroup"><h3 class="navGroupCategoryTitle">Concepts and Architecture</h3><ul class=""><li class="navListItem"><a class="navItem" href="/docs/en/2.7.4/concepts-overview">Overview</a></li><li class="navListItem"><a class="navItem" href="/docs/en/2.7.4/concepts-messaging">Messaging</a></li><li class="navListItem"><a class="navItem" href="/docs/en/2.7.4/concepts-architecture-overview">Architecture</a></li><li class="navListItem"><a class="navItem" href="/docs/en/2.7.4/concepts-clients">Clients</a></li><li class="navListItem"><a class="navItem" href="/docs/en/2.7.4/concepts-replication">Geo Replication</a></li><li class="navListItem"><a class="navItem" href="/docs/en/2.7.4/concepts-multi-tenancy">Multi Tenancy</a></li><li class="navListItem"><a class="navItem" href="/docs/en/2.7.4/concepts-authentication">Authentication and Authorization</a></li><li class="navListItem"><a class="navItem" href="/docs/en/2.7.4/concepts-topic-compaction">Topic Compaction</a></li><li class="navListItem"><a class="navItem" href="/docs/en/2.7.4/concepts-proxy-sni-routing">Proxy support with SNI routing</a></li><li class="navListItem"><a class="navItem" href="/docs/en/2.7.4/concepts-multiple-advertised-listeners">Multiple advertised listeners</a></li></ul></div><div class="navGroup"><h3 class="navGroupCategoryTitle">Pulsar Schema</h3><ul class=""><li class="navListItem"><a class="navItem" href="/docs/en/2.7.4/schema-get-started">Get started</a></li><li class="navListItem"><a class="navItem" href="/docs/en/2.7.4/schema-understand">Understand schema</a></li><li class="navListItem"><a class="navItem" href="/docs/en/2.7.4/schema-evolution-compatibility">Schema evolution and compatibility</a></li><li class="navListItem"><a class="navItem" href="/docs/en/2.7.4/schema-manage">Manage schema</a></li></ul></div><div class="navGroup"><h3 class="navGroupCategoryTitle">Pulsar Functions</h3><ul class=""><li class="navListItem"><a class="navItem" href="/docs/en/2.7.4/functions-overview">Overview</a></li><li class="navListItem"><a class="navItem" href="/docs/en/2.7.4/functions-worker">Setup: Pulsar Functions Worker</a></li><li class="navListItem"><a class="navItem" href="/docs/en/2.7.4/functions-runtime">Setup: Configure Functions runtime</a></li><li class="navListItem"><a class="navItem" href="/docs/en/2.7.4/functions-develop">How-to: Develop</a></li><li class="navListItem"><a class="navItem" href="/docs/en/2.7.4/functions-package">How-to: Package</a></li><li class="navListItem"><a class="navItem" href="/docs/en/2.7.4/functions-debug">How-to: Debug</a></li><li class="navListItem"><a class="navItem" href="/docs/en/2.7.4/functions-deploy">How-to: Deploy</a></li><li class="navListItem"><a class="navItem" href="/docs/en/2.7.4/functions-cli">Reference: CLI</a></li><li class="navListItem"><a class="navItem" href="/docs/en/2.7.4/window-functions-context">Window Functions: Context</a></li></ul></div><div class="navGroup"><h3 class="navGroupCategoryTitle">Pulsar IO</h3><ul class=""><li class="navListItem navListItemActive"><a class="navItem" href="/docs/en/2.7.4/io-overview">Overview</a></li><li class="navListItem"><a class="navItem" href="/docs/en/2.7.4/io-quickstart">Get started</a></li><li class="navListItem"><a class="navItem" href="/docs/en/2.7.4/io-use">Use</a></li><li class="navListItem"><a class="navItem" href="/docs/en/2.7.4/io-debug">Debug</a></li><li class="navListItem"><a class="navItem" href="/docs/en/2.7.4/io-connectors">Built-in connector</a></li><li class="navListItem"><a class="navItem" href="/docs/en/2.7.4/io-cdc">CDC connector</a></li><li class="navListItem"><a class="navItem" href="/docs/en/2.7.4/io-develop">Develop</a></li><li class="navListItem"><a class="navItem" href="/docs/en/2.7.4/io-cli">CLI</a></li></ul></div><div class="navGroup"><h3 class="navGroupCategoryTitle">Pulsar SQL</h3><ul class=""><li class="navListItem"><a class="navItem" href="/docs/en/2.7.4/sql-overview">Overview</a></li><li class="navListItem"><a class="navItem" href="/docs/en/2.7.4/sql-getting-started">Query data</a></li><li class="navListItem"><a class="navItem" href="/docs/en/2.7.4/sql-deployment-configurations">Configuration and deployment</a></li><li class="navListItem"><a class="navItem" href="/docs/en/2.7.4/sql-rest-api">REST APIs</a></li></ul></div><div class="navGroup"><h3 class="navGroupCategoryTitle">Tiered Storage</h3><ul class=""><li class="navListItem"><a class="navItem" href="/docs/en/2.7.4/tiered-storage-overview">Overview</a></li><li class="navListItem"><a class="navItem" href="/docs/en/2.7.4/tiered-storage-aws">AWS S3 offloader</a></li><li class="navListItem"><a class="navItem" href="/docs/en/2.7.4/tiered-storage-gcs">GCS offloader</a></li><li class="navListItem"><a class="navItem" href="/docs/en/2.7.4/tiered-storage-filesystem">Filesystem offloader</a></li><li class="navListItem"><a class="navItem" href="/docs/en/2.7.4/tiered-storage-azure">Azure BlobStore offloader</a></li></ul></div><div class="navGroup"><h3 class="navGroupCategoryTitle">Transactions</h3><ul class=""><li class="navListItem"><a class="navItem" href="/docs/en/2.7.4/transactions">Overview</a></li><li class="navListItem"><a class="navItem" href="/docs/en/2.7.4/transactions-guarantee">Transactions Guarantee</a></li><li class="navListItem"><a class="navItem" href="/docs/en/2.7.4/transactions-api">Transactions API</a></li></ul></div><div class="navGroup"><h3 class="navGroupCategoryTitle">Kubernetes (Helm)</h3><ul class=""><li class="navListItem"><a class="navItem" href="/docs/en/2.7.4/helm-overview">Overview</a></li><li class="navListItem"><a class="navItem" href="/docs/en/2.7.4/helm-prepare">Prepare</a></li><li class="navListItem"><a class="navItem" href="/docs/en/2.7.4/helm-install">Install</a></li><li class="navListItem"><a class="navItem" href="/docs/en/2.7.4/helm-deploy">Deployment</a></li><li class="navListItem"><a class="navItem" href="/docs/en/2.7.4/helm-upgrade">Upgrade</a></li><li class="navListItem"><a class="navItem" href="/docs/en/2.7.4/helm-tools">Required Tools</a></li></ul></div><div class="navGroup"><h3 class="navGroupCategoryTitle">Deployment</h3><ul class=""><li class="navListItem"><a class="navItem" href="/docs/en/2.7.4/deploy-aws">Amazon Web Services</a></li><li class="navListItem"><a class="navItem" href="/docs/en/2.7.4/deploy-kubernetes">Kubernetes</a></li><li class="navListItem"><a class="navItem" href="/docs/en/2.7.4/deploy-bare-metal">Bare metal</a></li><li class="navListItem"><a class="navItem" href="/docs/en/2.7.4/deploy-bare-metal-multi-cluster">Bare metal multi-cluster</a></li><li class="navListItem"><a class="navItem" href="/docs/en/2.7.4/deploy-docker">Docker</a></li><li class="navListItem"><a class="navItem" href="/docs/en/2.7.4/deploy-monitoring">Monitor</a></li></ul></div><div class="navGroup"><h3 class="navGroupCategoryTitle">Administration</h3><ul class=""><li class="navListItem"><a class="navItem" href="/docs/en/2.7.4/administration-zk-bk">ZooKeeper and BookKeeper</a></li><li class="navListItem"><a class="navItem" href="/docs/en/2.7.4/administration-geo">Geo-replication</a></li><li class="navListItem"><a class="navItem" href="/docs/en/2.7.4/administration-pulsar-manager">Pulsar Manager</a></li><li class="navListItem"><a class="navItem" href="/docs/en/2.7.4/administration-stats">Pulsar statistics</a></li><li class="navListItem"><a class="navItem" href="/docs/en/2.7.4/administration-load-balance">Load balance</a></li><li class="navListItem"><a class="navItem" href="/docs/en/2.7.4/administration-proxy">Pulsar proxy</a></li><li class="navListItem"><a class="navItem" href="/docs/en/2.7.4/administration-upgrade">Upgrade</a></li><li class="navListItem"><a class="navItem" href="/docs/en/2.7.4/administration-isolation">Pulsar isolation</a></li></ul></div><div class="navGroup"><h3 class="navGroupCategoryTitle">Security</h3><ul class=""><li class="navListItem"><a class="navItem" href="/docs/en/2.7.4/security-overview">Overview</a></li><li class="navListItem"><a class="navItem" href="/docs/en/2.7.4/security-tls-transport">Transport Encryption using TLS</a></li><li class="navListItem"><a class="navItem" href="/docs/en/2.7.4/security-tls-authentication">Authentication using TLS</a></li><li class="navListItem"><a class="navItem" href="/docs/en/2.7.4/security-tls-keystore">Using TLS with KeyStore configure</a></li><li class="navListItem"><a class="navItem" href="/docs/en/2.7.4/security-jwt">Authentication using JWT</a></li><li class="navListItem"><a class="navItem" href="/docs/en/2.7.4/security-athenz">Authentication using Athenz</a></li><li class="navListItem"><a class="navItem" href="/docs/en/2.7.4/security-kerberos">Authentication using Kerberos</a></li><li class="navListItem"><a class="navItem" href="/docs/en/2.7.4/security-oauth2">Authentication using OAuth 2.0 access tokens</a></li><li class="navListItem"><a class="navItem" href="/docs/en/2.7.4/security-authorization">Authorization and ACLs</a></li><li class="navListItem"><a class="navItem" href="/docs/en/2.7.4/security-encryption">End-to-End Encryption</a></li><li class="navListItem"><a class="navItem" href="/docs/en/2.7.4/security-extending">Extending</a></li><li class="navListItem"><a class="navItem" href="/docs/en/2.7.4/security-bouncy-castle">Bouncy Castle Providers</a></li></ul></div><div class="navGroup"><h3 class="navGroupCategoryTitle">Performance</h3><ul class=""><li class="navListItem"><a class="navItem" href="/docs/en/2.7.4/performance-pulsar-perf">Pulsar Perf</a></li></ul></div><div class="navGroup"><h3 class="navGroupCategoryTitle">Client Libraries</h3><ul class=""><li class="navListItem"><a class="navItem" href="/docs/en/2.7.4/client-libraries">Overview</a></li><li class="navListItem"><a class="navItem" href="/docs/en/2.7.4/client-libraries-java">Java</a></li><li class="navListItem"><a class="navItem" href="/docs/en/2.7.4/client-libraries-go">Go</a></li><li class="navListItem"><a class="navItem" href="/docs/en/2.7.4/client-libraries-python">Python</a></li><li class="navListItem"><a class="navItem" href="/docs/en/2.7.4/client-libraries-cpp">C++</a></li><li class="navListItem"><a class="navItem" href="/docs/en/2.7.4/client-libraries-node">Node.js</a></li><li class="navListItem"><a class="navItem" href="/docs/en/2.7.4/client-libraries-websocket">WebSocket</a></li><li class="navListItem"><a class="navItem" href="/docs/en/2.7.4/client-libraries-dotnet">C#</a></li></ul></div><div class="navGroup"><h3 class="navGroupCategoryTitle">Admin API</h3><ul class=""><li class="navListItem"><a class="navItem" href="/docs/en/2.7.4/admin-api-overview">Overview</a></li><li class="navListItem"><a class="navItem" href="/docs/en/2.7.4/admin-api-clusters">Clusters</a></li><li class="navListItem"><a class="navItem" 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class="navGroup"><h3 class="navGroupCategoryTitle">Cookbooks</h3><ul class=""><li class="navListItem"><a class="navItem" href="/docs/en/2.7.4/cookbooks-compaction">Topic compaction</a></li><li class="navListItem"><a class="navItem" href="/docs/en/2.7.4/cookbooks-deduplication">Message deduplication</a></li><li class="navListItem"><a class="navItem" href="/docs/en/2.7.4/cookbooks-non-persistent">Non-persistent messaging</a></li><li class="navListItem"><a class="navItem" href="/docs/en/2.7.4/cookbooks-retention-expiry">Message retention and expiry</a></li><li class="navListItem"><a class="navItem" href="/docs/en/2.7.4/cookbooks-encryption">Encryption</a></li><li class="navListItem"><a class="navItem" href="/docs/en/2.7.4/cookbooks-message-queue">Message queue</a></li><li class="navListItem"><a class="navItem" href="/docs/en/2.7.4/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/2.7.4/develop-tools">Simulation tools</a></li><li class="navListItem"><a class="navItem" href="/docs/en/2.7.4/developing-binary-protocol">Binary protocol</a></li><li class="navListItem"><a class="navItem" href="/docs/en/2.7.4/develop-schema">Custom schema storage</a></li><li class="navListItem"><a class="navItem" href="/docs/en/2.7.4/develop-load-manager">Modular load manager</a></li><li class="navListItem"><a class="navItem" href="/docs/en/2.7.4/develop-cpp">Building Pulsar C++ client</a></li></ul></div><div class="navGroup"><h3 class="navGroupCategoryTitle">Reference</h3><ul class=""><li class="navListItem"><a class="navItem" href="/docs/en/2.7.4/reference-terminology">Terminology</a></li><li class="navListItem"><a class="navItem" href="/docs/en/2.7.4/reference-cli-tools">Pulsar CLI tools</a></li><li class="navListItem"><a class="navItem" href="/docs/en/2.7.4/reference-configuration">Pulsar configuration</a></li><li 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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-overview.md" target="_blank" rel="noreferrer noopener">Edit</a><h1 id="__docusaurus" class="postHeaderTitle">Pulsar connector overview</h1></header><article><div><span><p>Messaging systems are most powerful when you can easily use them with external systems like databases and other messaging systems.</p>
<p><strong>Pulsar IO connectors</strong> enable you to easily create, deploy, and manage connectors that interact with external systems, such as <a href="https://cassandra.apache.org">Apache Cassandra</a>, <a href="https://www.aerospike.com">Aerospike</a>, and many others.</p>
<h2><a class="anchor" aria-hidden="true" id="concept"></a><a href="#concept" 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>Concept</h2>
<p>Pulsar IO connectors come in two types: <strong>source</strong> and <strong>sink</strong>.</p>
<p>This diagram illustrates the relationship between source, Pulsar, and sink:</p>
<p><img src="/docs/assets/pulsar-io.png" alt="Pulsar IO diagram" title="Pulsar IO connectors (sources and sinks)"></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>
<blockquote>
<p>Sources <strong>feed data from external systems into Pulsar</strong>.</p>
</blockquote>
<p>Common sources include other messaging systems and firehose-style data pipeline APIs.</p>
<p>For the complete list of Pulsar built-in source connectors, see <a href="/docs/en/2.7.4/io-connectors#source-connector">source connector</a>.</p>
<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>
<blockquote>
<p>Sinks <strong>feed data from Pulsar into external systems</strong>.</p>
</blockquote>
<p>Common sinks include other messaging systems and SQL and NoSQL databases.</p>
<p>For the complete list of Pulsar built-in sink connectors, see <a href="/docs/en/2.7.4/io-connectors#sink-connector">sink connector</a>.</p>
<h2><a class="anchor" aria-hidden="true" id="processing-guarantee"></a><a href="#processing-guarantee" 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>Processing guarantee</h2>
<p>Processing guarantees are used to handle errors when writing messages to Pulsar topics.</p>
<blockquote>
<p>Pulsar connectors and Functions use the <strong>same</strong> processing guarantees as below.</p>
</blockquote>
<table>
<thead>
<tr><th style="text-align:left">Delivery semantic</th><th style="text-align:left">Description</th></tr>
</thead>
<tbody>
<tr><td style="text-align:left"><code>at-most-once</code></td><td style="text-align:left">Each message sent to a connector is to be <strong>processed once</strong> or <strong>not to be processed</strong>.</td></tr>
<tr><td style="text-align:left"><code>at-least-once</code></td><td style="text-align:left">Each message sent to a connector is to be <strong>processed once</strong> or <strong>more than once</strong>.</td></tr>
<tr><td style="text-align:left"><code>effectively-once</code></td><td style="text-align:left">Each message sent to a connector has <strong>one output associated</strong> with it.</td></tr>
</tbody>
</table>
<blockquote>
<p>Processing guarantees for connectors not just rely on Pulsar guarantee but also <strong>relate to external systems</strong>, that is, <strong>the implementation of source and sink</strong>.</p>
</blockquote>
<ul>
<li><p>Source: Pulsar ensures that writing messages to Pulsar topics respects to the processing guarantees. It is within Pulsar's control.</p></li>
<li><p>Sink: the processing guarantees rely on the sink implementation. If the sink implementation does not handle retries in an idempotent way, the sink does not respect to the processing guarantees.</p></li>
</ul>
<h3><a class="anchor" aria-hidden="true" id="set"></a><a href="#set" 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>Set</h3>
<p>When creating a connector, you can set the processing guarantee with the following semantics:</p>
<ul>
<li><p>ATLEAST_ONCE</p></li>
<li><p>ATMOST_ONCE</p></li>
<li><p>EFFECTIVELY_ONCE</p></li>
</ul>
<blockquote>
<p>If <code>--processing-guarantees</code> is not specified when creating a connector, the default semantic is <code>ATLEAST_ONCE</code>.</p>
</blockquote>
<p>Here takes <strong>Admin CLI</strong> as an example. For more information about <strong>REST API</strong> or <strong>JAVA Admin API</strong>, see <a href="/docs/en/2.7.4/io-use#create">here</a>.</p>
<div class="tabs"><div class="nav-tabs"><div id="tab-group-6382-tab-6383" class="nav-link active" data-group="group_6382" data-tab="tab-group-6382-content-6383">Source</div><div id="tab-group-6382-tab-6384" class="nav-link" data-group="group_6382" data-tab="tab-group-6382-content-6384">Sink</div></div><div class="tab-content"><div id="tab-group-6382-content-6383" class="tab-pane active" data-group="group_6382" tabindex="-1"><div><span><pre><code class="hljs css language-bash">$ bin/pulsar-admin sources create \<br />  --processing-guarantees ATMOST_ONCE \<br />  <span class="hljs-comment"># Other source configs</span><br /></code></pre>
<p>For more information about the options of <code>pulsar-admin sources create</code>, see <a href="/docs/en/2.7.4/reference-connector-admin#create">here</a>.</p>
</span></div></div><div id="tab-group-6382-content-6384" class="tab-pane" data-group="group_6382" tabindex="-1"><div><span><pre><code class="hljs css language-bash">$ bin/pulsar-admin sinks create \<br />  --processing-guarantees EFFECTIVELY_ONCE \<br />  <span class="hljs-comment"># Other sink configs</span><br /></code></pre>
<p>For more information about the options of <code>pulsar-admin sinks create</code>, see <a href="/docs/en/2.7.4/reference-connector-admin#create-1">here</a>.</p>
</span></div></div></div></div>
<h3><a class="anchor" aria-hidden="true" id="update"></a><a href="#update" 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>Update</h3>
<p>After creating a connector, you can update the processing guarantee with the following semantics:</p>
<ul>
<li><p>ATLEAST_ONCE</p></li>
<li><p>ATMOST_ONCE</p></li>
<li><p>EFFECTIVELY_ONCE</p></li>
</ul>
<p>Here takes <strong>Admin CLI</strong> as an example. For more information about <strong>REST API</strong> or <strong>JAVA Admin API</strong>, see <a href="/docs/en/2.7.4/io-use#create">here</a>.</p>
<div class="tabs"><div class="nav-tabs"><div id="tab-group-6385-tab-6386" class="nav-link active" data-group="group_6385" data-tab="tab-group-6385-content-6386">Source</div><div id="tab-group-6385-tab-6387" class="nav-link" data-group="group_6385" data-tab="tab-group-6385-content-6387">Sink</div></div><div class="tab-content"><div id="tab-group-6385-content-6386" class="tab-pane active" data-group="group_6385" tabindex="-1"><div><span><pre><code class="hljs css language-bash">$ bin/pulsar-admin sources update \<br />  --processing-guarantees EFFECTIVELY_ONCE \<br />  <span class="hljs-comment"># Other source configs</span><br /></code></pre>
<p>For more information about the options of <code>pulsar-admin sources update</code>, see <a href="/docs/en/2.7.4/reference-connector-admin#update">here</a>.</p>
</span></div></div><div id="tab-group-6385-content-6387" class="tab-pane" data-group="group_6385" tabindex="-1"><div><span><pre><code class="hljs css language-bash">$ bin/pulsar-admin sinks update \<br />  --processing-guarantees ATMOST_ONCE \<br />  <span class="hljs-comment"># Other sink configs</span><br /></code></pre>
<p>For more information about the options of <code>pulsar-admin sinks update</code>, see <a href="/docs/en/2.7.4/reference-connector-admin#update-1">here</a>.</p>
</span></div></div></div></div>
<h2><a class="anchor" aria-hidden="true" id="work-with-connector"></a><a href="#work-with-connector" 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>Work with connector</h2>
<p>You can manage Pulsar connectors (for example, create, update, start, stop, restart, reload, delete and perform other operations on connectors) via the <a href="/docs/en/2.7.4/reference-connector-admin">Connector Admin CLI</a> with <a href="/docs/en/2.7.4/reference-connector-admin#sources">sources</a> and <a href="/docs/en/2.7.4/reference-connector-admin#sinks">sinks</a> subcommands.</p>
<p>Connectors (sources and sinks) and Functions are components of instances, and they all run on Functions workers. When managing a source, sink or function via <a href="/docs/en/2.7.4/reference-connector-admin">Connector Admin CLI</a> or <a href="/docs/en/2.7.4/functions-cli">Functions Admin CLI</a>, an instance is started on a worker. For more information, see <a href="/docs/en/2.7.4/functions-worker#run-functions-worker-separately">Functions worker</a>.</p>
</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/en/2.7.4/window-functions-context"><span class="arrow-prev">← </span><span>Window Functions: Context</span></a><a class="docs-next button" href="/docs/en/2.7.4/io-quickstart"><span>Get started</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#concept">Concept</a><ul class="toc-headings"><li><a href="#source">Source</a></li><li><a href="#sink">Sink</a></li></ul></li><li><a href="#processing-guarantee">Processing guarantee</a><ul class="toc-headings"><li><a href="#set">Set</a></li><li><a href="#update">Update</a></li></ul></li><li><a href="#work-with-connector">Work with connector</a></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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