<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Managing Schemas · Apache Pulsar</title><meta name="viewport" content="width=device-width, initial-scale=1.0"/><meta name="generator" content="Docusaurus"/><meta name="description" content="Schemas, like other entities in Pulsar, can be managed using the [admin API](/docs/en/2.2.1/admin-api-overview). "/><meta name="docsearch:version" content="2.2.1"/><meta name="docsearch:language" content="en"/><meta property="og:title" content="Managing Schemas · Apache Pulsar"/><meta property="og:type" content="website"/><meta property="og:url" content="https://pulsar.apache.org/"/><meta property="og:description" content="Schemas, like other entities in Pulsar, can be managed using the [admin API](/docs/en/2.2.1/admin-api-overview). "/><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>2.2.1</h3></a><div class="navigationWrapper navigationSlider"><nav class="slidingNav"><ul class="nav-site nav-site-internal"><li class="siteNavGroupActive"><a href="/docs/en/2.2.1/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/2.2.1/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/2.2.1/admin-api-schemas">日本語</a></li><li><a href="/docs/fr/2.2.1/admin-api-schemas">Français</a></li><li><a href="/docs/ko/2.2.1/admin-api-schemas">한국어</a></li><li><a href="/docs/zh-CN/2.2.1/admin-api-schemas">中文</a></li><li><a href="/docs/zh-TW/2.2.1/admin-api-schemas">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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<h2><a class="anchor" aria-hidden="true" id="schema-resources"></a><a href="#schema-resources" 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>Schema resources</h2>
<p>A Pulsar schema is a fairly simple data structure stored in Pulsar for representing the structure of messages stored in a Pulsar topic. The schema structure consists of:</p>
<ul>
<li><em>Name</em>: A schema's name is the topic that the schema is associated to.</li>
<li><em>Type</em>: A schema type represents the type of the schema. The predefined schema types can be found <a href="/docs/en/2.2.1/concepts-schema-registry#supported-schema-formats">here</a>. If it
is a customized schema, it is left as an empty string.</li>
<li><em>Payload</em>: It is a binary representation of the schema. How to interpret it is up to the implementation of the schema.</li>
<li><em>Properties</em>: It is a user defined properties as a string/string map. Applications can use this bag for carrying any application specific logics. Possible properties
might be the Git hash associated with the schema, an environment string like <code>dev</code> or <code>prod</code>, etc.</li>
</ul>
<p>All the schemas are versioned with versions. So you can retrieve the schema definition of a given version if the version is not deleted.</p>
<h3><a class="anchor" aria-hidden="true" id="upload-schema"></a><a href="#upload-schema" 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>Upload Schema</h3>
<h4><a class="anchor" aria-hidden="true" id="pulsar-admin"></a><a href="#pulsar-admin" 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>pulsar-admin</h4>
<p>You can upload a new schema using the <a href="/docs/en/2.2.1/reference-pulsar-admin#get-5"><code>upload</code></a> subcommand:</p>
<pre><code class="hljs css language-shell"><span class="hljs-meta">$</span><span class="bash"> pulsar-admin schemas upload &lt;topic-name&gt; --filename /path/to/schema-definition-file </span>
</code></pre>
<p>The schema definition file should contain following json string on defining how the schema look like:</p>
<pre><code class="hljs css language-json">{
    <span class="hljs-attr">"type"</span>: <span class="hljs-string">"STRING"</span>,
    <span class="hljs-attr">"schema"</span>: <span class="hljs-string">""</span>,
    <span class="hljs-attr">"properties"</span>: {
        <span class="hljs-attr">"key1"</span> : <span class="hljs-string">"value1"</span>
    }
}
</code></pre>
<p>An example of the schema definition file can be found at <a href="https://github.com/apache/pulsar/tree/master//conf/schema_example.conf">SchemaExample</a>
.</p>
<h4><a class="anchor" aria-hidden="true" id="rest"></a><a href="#rest" 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>REST</h4>
<p><a href="https://pulsar.apache.org/admin-rest-api#operation/uploadSchemaversion=master&amp;apiVersion=v2"><b>POST</b> <i>/admin/v2/schemas/:tenant/:namespace/:topic/schema</i></a>
</p>
<h3><a class="anchor" aria-hidden="true" id="get-schema"></a><a href="#get-schema" 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>Get Schema</h3>
<h4><a class="anchor" aria-hidden="true" id="pulsar-admin-1"></a><a href="#pulsar-admin-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>pulsar-admin</h4>
<p>You can get the latest version of Schema using the <a href="/docs/en/2.2.1/reference-pulsar-admin#get-5"><code>get</code></a> subcommand.</p>
<pre><code class="hljs css language-shell"><span class="hljs-meta">$</span><span class="bash"> pulsar-admin schemas get &lt;topic-name&gt;</span>
{
    "version": 0,
    "type": "String",
    "timestamp": 0,
    "data": "string",
    "properties": {
        "property1": "string",
        "property2": "string"
    }
}
</code></pre>
<p>You can also retrieve the Schema of a given version by specifying <code>--version</code> option.</p>
<pre><code class="hljs css language-shell"><span class="hljs-meta">$</span><span class="bash"> pulsar-admin schemas get &lt;topic-name&gt; --version &lt;version&gt;</span>
</code></pre>
<h4><a class="anchor" aria-hidden="true" id="rest-api"></a><a href="#rest-api" 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>REST API</h4>
<p>Retrieve the latest version of the schema:</p>
<p><a href="https://pulsar.apache.org/admin-rest-api#operation/getSchemaversion=master&amp;apiVersion=v2"><b>GET</b> <i>/admin/v2/schemas/:tenant/:namespace/:topic/schema</i></a>
</p>
<p>Retrieve the schema of a given version:</p>
<p><a href="https://pulsar.apache.org/admin-rest-api#operation/getSchemaversion=master&amp;apiVersion=v2"><b>GET</b> <i>/admin/v2/schemas/:tenant/:namespace/:topic/schema/:version</i></a>
</p>
<h3><a class="anchor" aria-hidden="true" id="delete-schema"></a><a href="#delete-schema" 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>Delete Schema</h3>
<h4><a class="anchor" aria-hidden="true" id="pulsar-admin-2"></a><a href="#pulsar-admin-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>pulsar-admin</h4>
<p>You can delete a schema using the <a href="/docs/en/2.2.1/reference-pulsar-admin#delete-8"><code>delete</code></a> subcommand.</p>
<pre><code class="hljs css language-shell"><span class="hljs-meta">$</span><span class="bash"> pulsar-admin schemas delete &lt;topic-name&gt;</span>
</code></pre>
<h4><a class="anchor" aria-hidden="true" id="rest-api-1"></a><a href="#rest-api-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>REST API</h4>
<p><a href="https://pulsar.apache.org/admin-rest-api#operation/deleteSchemaversion=master&amp;apiVersion=v2"><b>DELETE</b> <i>/admin/v2/schemas/:tenant/:namespace/:topic/schema</i></a>
</p>
</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/en/2.2.1/admin-api-partitioned-topics"><span class="arrow-prev">← </span><span>Partitioned topics</span></a><a class="docs-next button" href="/docs/en/2.2.1/adaptors-kafka"><span>Kafka client wrapper</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#schema-resources">Schema resources</a><ul class="toc-headings"><li><a href="#upload-schema">Upload Schema</a></li><li><a href="#get-schema">Get Schema</a></li><li><a href="#delete-schema">Delete Schema</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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