<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>HDFS3 sink connector · Apache Pulsar</title><meta name="viewport" content="width=device-width, initial-scale=1.0"/><meta name="generator" content="Docusaurus"/><meta name="description" content="The HDFS3 sink connector pulls the messages from Pulsar topics "/><meta name="docsearch:version" content="next"/><meta name="docsearch:language" content="en"/><meta property="og:title" content="HDFS3 sink connector · Apache Pulsar"/><meta property="og:type" content="website"/><meta property="og:url" content="https://pulsar.apache.org/"/><meta property="og:description" content="The HDFS3 sink connector pulls the messages from Pulsar topics "/><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>next</h3></a><div class="navigationWrapper navigationSlider"><nav class="slidingNav"><ul class="nav-site nav-site-internal"><li class=""><a href="/docs/en/next/getting-started-standalone" target="_self">Docs</a></li><li class=""><a href="/en/download" target="_self">Download</a></li><li class=""><a href="/docs/en/next/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/next/io-hdfs3-sink">日本語</a></li><li><a href="/docs/fr/next/io-hdfs3-sink">Français</a></li><li><a href="/docs/ko/next/io-hdfs3-sink">한국어</a></li><li><a href="/docs/zh-CN/next/io-hdfs3-sink">中文</a></li><li><a href="/docs/zh-TW/next/io-hdfs3-sink">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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and persists the messages to HDFS files.</p>
<h2><a class="anchor" aria-hidden="true" id="configuration"></a><a href="#configuration" 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>Configuration</h2>
<p>The configuration of the HDFS3 sink connector has the following properties.</p>
<h3><a class="anchor" aria-hidden="true" id="property"></a><a href="#property" 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>Property</h3>
<table>
<thead>
<tr><th>Name</th><th>Type</th><th>Required</th><th>Default</th><th>Description</th></tr>
</thead>
<tbody>
<tr><td><code>hdfsConfigResources</code></td><td>String</td><td>true</td><td>None</td><td>A file or a comma-separated list containing the Hadoop file system configuration.<br/><br/><strong>Example</strong><br/>'core-site.xml'<br/>'hdfs-site.xml'</td></tr>
<tr><td><code>directory</code></td><td>String</td><td>true</td><td>None</td><td>The HDFS directory where files read from or written to.</td></tr>
<tr><td><code>encoding</code></td><td>String</td><td>false</td><td>None</td><td>The character encoding for the files.<br/><br/><strong>Example</strong><br/>UTF-8<br/>ASCII</td></tr>
<tr><td><code>compression</code></td><td>Compression</td><td>false</td><td>None</td><td>The compression code used to compress or de-compress the files on HDFS. <br/><br/>Below are the available options:<br/><li>BZIP2<br/><li>DEFLATE<br/><li>GZIP<br/><li>LZ4<br/><li>SNAPPY</td></tr>
<tr><td><code>kerberosUserPrincipal</code></td><td>String</td><td>false</td><td>None</td><td>The principal account of Kerberos user used for authentication.</td></tr>
<tr><td><code>keytab</code></td><td>String</td><td>false</td><td>None</td><td>The full pathname of the Kerberos keytab file used for authentication.</td></tr>
<tr><td><code>filenamePrefix</code></td><td>String</td><td>false</td><td>None</td><td>The prefix of the files created inside the HDFS directory.<br/><br/><strong>Example</strong><br/> The value of topicA result in files named topicA-.</td></tr>
<tr><td><code>fileExtension</code></td><td>String</td><td>false</td><td>None</td><td>The extension added to the files written to HDFS.<br/><br/><strong>Example</strong><br/>'.txt'<br/> '.seq'</td></tr>
<tr><td><code>separator</code></td><td>char</td><td>false</td><td>None</td><td>The character used to separate records in a text file. <br/><br/>If no value is provided, the contents from all records are concatenated together in one continuous byte array.</td></tr>
<tr><td><code>syncInterval</code></td><td>long</td><td>false</td><td>0</td><td>The interval between calls to flush data to HDFS disk in milliseconds.</td></tr>
<tr><td><code>maxPendingRecords</code></td><td>int</td><td>false</td><td>Integer.MAX_VALUE</td><td>The maximum number of records that hold in memory before acking. <br/><br/>Setting this property to 1 makes every record send to disk before the record is acked.<br/><br/>Setting this property to a higher value allows buffering records before flushing them to disk.</td></tr>
</tbody>
</table>
<h3><a class="anchor" aria-hidden="true" id="example"></a><a href="#example" 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>Example</h3>
<p>Before using the HDFS3 sink connector, you need to create a configuration file through one of the following methods.</p>
<ul>
<li><p>JSON</p>
<pre><code class="hljs css language-json">{
   <span class="hljs-attr">"configs"</span>: {
      <span class="hljs-attr">"hdfsConfigResources"</span>: <span class="hljs-string">"core-site.xml"</span>,
      <span class="hljs-attr">"directory"</span>: <span class="hljs-string">"/foo/bar"</span>,
      <span class="hljs-attr">"filenamePrefix"</span>: <span class="hljs-string">"prefix"</span>,
      <span class="hljs-attr">"compression"</span>: <span class="hljs-string">"SNAPPY"</span>
   }
}
</code></pre></li>
<li><p>YAML</p>
<pre><code class="hljs css language-yaml"><span class="hljs-attr">configs:</span>
    <span class="hljs-attr">hdfsConfigResources:</span> <span class="hljs-string">"core-site.xml"</span>
    <span class="hljs-attr">directory:</span> <span class="hljs-string">"/foo/bar"</span>
    <span class="hljs-attr">filenamePrefix:</span> <span class="hljs-string">"prefix"</span>
    <span class="hljs-attr">compression:</span> <span class="hljs-string">"SNAPPY"</span>
</code></pre></li>
</ul>
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