<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>BookKeeper Ledger Metadata · Apache Pulsar</title><meta name="viewport" content="width=device-width, initial-scale=1.0"/><meta name="generator" content="Docusaurus"/><meta name="description" content="Pulsar stores data on BookKeeper ledgers, you can understand the contents of a ledger by inspecting the metadata attached to the ledger."/><meta name="docsearch:version" content="2.8.2"/><meta name="docsearch:language" content="en"/><meta property="og:title" content="BookKeeper Ledger Metadata · Apache Pulsar"/><meta property="og:type" content="website"/><meta property="og:url" content="https://pulsar.apache.org/"/><meta property="og:description" content="Pulsar stores data on BookKeeper ledgers, you can understand the contents of a ledger by inspecting the metadata attached to the ledger."/><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>2.8.2</h3></a><div class="navigationWrapper navigationSlider"><nav class="slidingNav"><ul class="nav-site nav-site-internal"><li class="siteNavGroupActive"><a href="/docs/en/2.8.2/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/2.8.2/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/2.8.2/cookbooks-bookkeepermetadata">日本語</a></li><li><a href="/docs/fr/2.8.2/cookbooks-bookkeepermetadata">Français</a></li><li><a href="/docs/ko/2.8.2/cookbooks-bookkeepermetadata">한국어</a></li><li><a href="/docs/zh-CN/2.8.2/cookbooks-bookkeepermetadata">中文</a></li><li><a href="/docs/zh-TW/2.8.2/cookbooks-bookkeepermetadata">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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Such metadata are stored on ZooKeeper and they are readable using BookKeeper APIs.</p>
<p>Description of current metadata:</p>
<table>
<thead>
<tr><th>Scope</th><th>Metadata name</th><th>Metadata value</th></tr>
</thead>
<tbody>
<tr><td>All ledgers</td><td>application</td><td>'pulsar'</td></tr>
<tr><td>All ledgers</td><td>component</td><td>'managed-ledger', 'schema', 'compacted-topic'</td></tr>
<tr><td>Managed ledgers</td><td>pulsar/managed-ledger</td><td>name of the ledger</td></tr>
<tr><td>Cursor</td><td>pulsar/cursor</td><td>name of the cursor</td></tr>
<tr><td>Compacted topic</td><td>pulsar/compactedTopic</td><td>name of the original topic</td></tr>
<tr><td>Compacted topic</td><td>pulsar/compactedTo</td><td>id of the last compacted message</td></tr>
</tbody>
</table>
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