<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Custom schema storage · Apache Pulsar</title><meta name="viewport" content="width=device-width, initial-scale=1.0"/><meta name="generator" content="Docusaurus"/><meta name="description" content="By default, Pulsar stores data type [schemas](/docs/en/2.5.1/concepts-schema-registry) in [Apache BookKeeper](https://bookkeeper.apache.org) (which is deployed alongside Pulsar). You can, however, use another storage system if you wish. This doc walks you through creating your own schema storage implementation."/><meta name="docsearch:version" content="2.5.1"/><meta name="docsearch:language" content="en"/><meta property="og:title" content="Custom schema storage · Apache Pulsar"/><meta property="og:type" content="website"/><meta property="og:url" content="https://pulsar.apache.org/"/><meta property="og:description" content="By default, Pulsar stores data type [schemas](/docs/en/2.5.1/concepts-schema-registry) in [Apache BookKeeper](https://bookkeeper.apache.org) (which is deployed alongside Pulsar). You can, however, use another storage system if you wish. This doc walks you through creating your own schema storage implementation."/><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>2.5.1</h3></a><div class="navigationWrapper navigationSlider"><nav class="slidingNav"><ul class="nav-site nav-site-internal"><li class="siteNavGroupActive"><a href="/docs/en/2.5.1/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/2.5.1/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/2.5.1/develop-schema">日本語</a></li><li><a href="/docs/fr/2.5.1/develop-schema">Français</a></li><li><a href="/docs/ko/2.5.1/develop-schema">한국어</a></li><li><a href="/docs/zh-CN/2.5.1/develop-schema">中文</a></li><li><a href="/docs/zh-TW/2.5.1/develop-schema">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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<p>In order to use a non-default (i.e. non-BookKeeper) storage system for Pulsar schemas, you need to implement two Java interfaces: <a href="#schemastorage-interface"><code>SchemaStorage</code></a> and <a href="#schemastoragefactory-interface"><code>SchemaStorageFactory</code></a>.</p>
<h2><a class="anchor" aria-hidden="true" id="schemastorage-interface"></a><a href="#schemastorage-interface" 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>SchemaStorage interface</h2>
<p>The <code>SchemaStorage</code> interface has the following methods:</p>
<pre><code class="hljs css language-java"><span class="hljs-keyword">public</span> <span class="hljs-class"><span class="hljs-keyword">interface</span> <span class="hljs-title">SchemaStorage</span> </span>{
    <span class="hljs-comment">// How schemas are updated</span>
    <span class="hljs-function">CompletableFuture&lt;SchemaVersion&gt; <span class="hljs-title">put</span><span class="hljs-params">(String key, <span class="hljs-keyword">byte</span>[] value, <span class="hljs-keyword">byte</span>[] hash)</span></span>;

    <span class="hljs-comment">// How schemas are fetched from storage</span>
    <span class="hljs-function">CompletableFuture&lt;StoredSchema&gt; <span class="hljs-title">get</span><span class="hljs-params">(String key, SchemaVersion version)</span></span>;

    <span class="hljs-comment">// How schemas are deleted</span>
    <span class="hljs-function">CompletableFuture&lt;SchemaVersion&gt; <span class="hljs-title">delete</span><span class="hljs-params">(String key)</span></span>;

    <span class="hljs-comment">// Utility method for converting a schema version byte array to a SchemaVersion object</span>
    <span class="hljs-function">SchemaVersion <span class="hljs-title">versionFromBytes</span><span class="hljs-params">(<span class="hljs-keyword">byte</span>[] version)</span></span>;

    <span class="hljs-comment">// Startup behavior for the schema storage client</span>
    <span class="hljs-function"><span class="hljs-keyword">void</span> <span class="hljs-title">start</span><span class="hljs-params">()</span> <span class="hljs-keyword">throws</span> Exception</span>;

    <span class="hljs-comment">// Shutdown behavior for the schema storage client</span>
    <span class="hljs-function"><span class="hljs-keyword">void</span> <span class="hljs-title">close</span><span class="hljs-params">()</span> <span class="hljs-keyword">throws</span> Exception</span>;
}
</code></pre>
<blockquote>
<p>For a full-fledged example schema storage implementation, see the <a href="https://github.com/apache/pulsar/blob/master/pulsar-broker/src/main/java/org/apache/pulsar/broker/service/schema/BookkeeperSchemaStorage.java"><code>BookKeeperSchemaStorage</code></a> class.</p>
</blockquote>
<h2><a class="anchor" aria-hidden="true" id="schemastoragefactory-interface"></a><a href="#schemastoragefactory-interface" 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>SchemaStorageFactory interface</h2>
<pre><code class="hljs css language-java"><span class="hljs-keyword">public</span> <span class="hljs-class"><span class="hljs-keyword">interface</span> <span class="hljs-title">SchemaStorageFactory</span> </span>{
    <span class="hljs-meta">@NotNull</span>
    <span class="hljs-function">SchemaStorage <span class="hljs-title">create</span><span class="hljs-params">(PulsarService pulsar)</span> <span class="hljs-keyword">throws</span> Exception</span>;
}
</code></pre>
<blockquote>
<p>For a full-fledged example schema storage factory implementation, see the <a href="https://github.com/apache/pulsar/blob/master/pulsar-broker/src/main/java/org/apache/pulsar/broker/service/schema/BookkeeperSchemaStorageFactory.java"><code>BookKeeperSchemaStorageFactory</code></a> class.</p>
</blockquote>
<h2><a class="anchor" aria-hidden="true" id="deployment"></a><a href="#deployment" 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>Deployment</h2>
<p>In order to use your custom schema storage implementation, you'll need to:</p>
<ol>
<li>Package the implementation in a <a href="https://docs.oracle.com/javase/tutorial/deployment/jar/basicsindex.html">JAR</a> file.</li>
<li>Add that jar to the <code>lib</code> folder in your Pulsar <a href="/docs/en/2.5.1/getting-started-standalone#installing-pulsar">binary or source distribution</a>.</li>
<li>Change the <code>schemaRegistryStorageClassName</code> configuration in <a href="/docs/en/2.5.1/reference-configuration#broker"><code>broker.conf</code></a> to your custom factory class (i.e. the <code>SchemaStorageFactory</code> implementation, not the <code>SchemaStorage</code> implementation).</li>
<li>Start up Pulsar.</li>
</ol>
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