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 <!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Human-readable Byte Configuration Reference · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/0.23.0/configuration/human-readable-byte.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.23.0" /><meta property="og:title" content="Human-readable Byte Configuration Reference · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
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 <p>This page documents configuration properties related to bytes.</p>
 <p>These properties can be configured through 2 ways:</p>
 <ol>
 <li>a simple number in bytes</li>
 <li>a number with a unit suffix</li>
 </ol>
 <h2><a class="anchor" aria-hidden="true" id="a-number-in-bytes"></a><a href="#a-number-in-bytes" 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>A number in bytes</h2>
 <p>Given that cache size is 3G, there's a configuration as below</p>
 <pre><code class="hljs css language-properties"><span class="hljs-comment"># 3G bytes = 3_000_000_000 bytes</span>
 <span class="hljs-meta">druid.cache.sizeInBytes</span>=<span class="hljs-string">3000000000 </span>
 </code></pre>
 <h2><a class="anchor" aria-hidden="true" id="a-number-with-a-unit-suffix"></a><a href="#a-number-with-a-unit-suffix" 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>A number with a unit suffix</h2>
 <p>When you have to put a large number for some configuration as above, it is easy to make a mistake such as extra or missing 0s. Druid supports a better way, a number with a unit suffix.</p>
 <p>Given a disk of 1T, the configuration can be</p>
 <pre><code class="hljs css language-properties"><span class="hljs-meta">druid.segmentCache.locations</span>=<span class="hljs-string">[{"path":"/segment-cache-00","maxSize":"1t"},{"path":"/segment-cache-01","maxSize":"1200g"}]</span>
 </code></pre>
 <p>Note: in above example, both <code>1t</code> and <code>1T</code> are acceptable since it's case-insensitive.
 Also, only integers are valid as the number part. For example, you can't replace <code>1200g</code> with <code>1.2t</code>.</p>
 <h3><a class="anchor" aria-hidden="true" id="supported-units"></a><a href="#supported-units" 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>Supported Units</h3>
 <p>In the world of computer, a unit like <code>K</code> is ambiguous. It means 1000 or 1024 in different contexts, for more information please see <a href="https://en.wikipedia.org/wiki/Binary_prefix">Here</a>.</p>
 <p>To make it clear, the base of units are defined in Druid as below</p>
 <table>
 <thead>
 <tr><th>Unit</th><th>Description</th><th>Base</th></tr>
 </thead>
 <tbody>
 <tr><td>K</td><td>Kilo Decimal Byte</td><td>1_000</td></tr>
 <tr><td>M</td><td>Mega Decimal Byte</td><td>1_000_000</td></tr>
 <tr><td>G</td><td>Giga Decimal Byte</td><td>1_000_000_000</td></tr>
 <tr><td>T</td><td>Tera Decimal Byte</td><td>1_000_000_000_000</td></tr>
 <tr><td>P</td><td>Peta Decimal Byte</td><td>1_000_000_000_000_000</td></tr>
 <tr><td>Ki</td><td>Kilo Binary Byte</td><td>1024</td></tr>
 <tr><td>Mi</td><td>Mega Binary Byte</td><td>1024 * 1024</td></tr>
 <tr><td>Gi</td><td>Giga Binary Byte</td><td>1024 * 1024 * 1024</td></tr>
 <tr><td>Ti</td><td>Tera Binary Byte</td><td>1024 * 1024 * 1024 * 1024</td></tr>
 <tr><td>Pi</td><td>Peta Binary Byte</td><td>1024 * 1024 * 1024 * 1024 * 1024</td></tr>
 <tr><td>KiB</td><td>Kilo Binary Byte</td><td>1024</td></tr>
 <tr><td>MiB</td><td>Mega Binary Byte</td><td>1024 * 1024</td></tr>
 <tr><td>GiB</td><td>Giga Binary Byte</td><td>1024 * 1024 * 1024</td></tr>
 <tr><td>TiB</td><td>Tera Binary Byte</td><td>1024 * 1024 * 1024 * 1024</td></tr>
 <tr><td>PiB</td><td>Peta Binary Byte</td><td>1024 * 1024 * 1024 * 1024 * 1024</td></tr>
 </tbody>
 </table>
 <p>Unit is case-insensitive. <code>k</code>, <code>kib</code>, <code>ki</code>, <code>KiB</code>, <code>Ki</code>, <code>kiB</code> are all acceptable.</p>
 <p>Here are some examples</p>
 <pre><code class="hljs css language-properties"><span class="hljs-comment"># 1G bytes = 1_000_000_000 bytes</span>
 <span class="hljs-meta">druid.cache.sizeInBytes</span>=<span class="hljs-string">1g </span>
 </code></pre>
 <pre><code class="hljs css language-properties"><span class="hljs-comment"># 256MiB bytes = 256 * 1024 * 1024 bytes</span>
 <span class="hljs-meta">druid.cache.sizeInBytes</span>=<span class="hljs-string">256MiB </span>
 </code></pre>
 <pre><code class="hljs css language-properties"><span class="hljs-comment"># 256Mi = 256MiB = 256 * 1024 * 1024 bytes</span>
 <span class="hljs-meta">druid.cache.sizeInBytes</span>=<span class="hljs-string">256Mi</span>
 </code></pre>
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	<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Human-readable Byte Configuration Reference · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/0.23.0/configuration/human-readable-byte.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="<!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.23.0" /><meta property="og:title" content="Human-readable Byte Configuration Reference · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="<!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
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	~ Licensed to the Apache Software Foundation (ASF) under one
	~ or more contributor license agreements. See the NOTICE file
	~ distributed with this work for additional information
	~ regarding copyright ownership. The ASF licenses this file
	~ to you under the Apache License, Version 2.0 (the
	~ "License"); you may not use this file except in compliance
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	~
	~ Unless required by applicable law or agreed to in writing,
	~ software distributed under the License is distributed on an
	~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
	~ KIND, either express or implied. See the License for the
	~ specific language governing permissions and limitations
	~ under the License.
	-->
	<p>This page documents configuration properties related to bytes.</p>
	<p>These properties can be configured through 2 ways:</p>
	<ol>
	<li>a simple number in bytes</li>
	<li>a number with a unit suffix</li>
	</ol>
	<h2><a class="anchor" aria-hidden="true" id="a-number-in-bytes"></a><a href="#a-number-in-bytes" 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>A number in bytes</h2>
	<p>Given that cache size is 3G, there's a configuration as below</p>
	<pre><code class="hljs css language-properties"><span class="hljs-comment"># 3G bytes = 3_000_000_000 bytes</span>
	<span class="hljs-meta">druid.cache.sizeInBytes</span>=<span class="hljs-string">3000000000 </span>
	</code></pre>
	<h2><a class="anchor" aria-hidden="true" id="a-number-with-a-unit-suffix"></a><a href="#a-number-with-a-unit-suffix" 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>A number with a unit suffix</h2>
	<p>When you have to put a large number for some configuration as above, it is easy to make a mistake such as extra or missing 0s. Druid supports a better way, a number with a unit suffix.</p>
	<p>Given a disk of 1T, the configuration can be</p>
	<pre><code class="hljs css language-properties"><span class="hljs-meta">druid.segmentCache.locations</span>=<span class="hljs-string">[{"path":"/segment-cache-00","maxSize":"1t"},{"path":"/segment-cache-01","maxSize":"1200g"}]</span>
	</code></pre>
	<p>Note: in above example, both <code>1t</code> and <code>1T</code> are acceptable since it's case-insensitive.
	Also, only integers are valid as the number part. For example, you can't replace <code>1200g</code> with <code>1.2t</code>.</p>
	<h3><a class="anchor" aria-hidden="true" id="supported-units"></a><a href="#supported-units" 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>Supported Units</h3>
	<p>In the world of computer, a unit like <code>K</code> is ambiguous. It means 1000 or 1024 in different contexts, for more information please see <a href="https://en.wikipedia.org/wiki/Binary_prefix">Here</a>.</p>
	<p>To make it clear, the base of units are defined in Druid as below</p>
	<table>
	<thead>
	<tr><th>Unit</th><th>Description</th><th>Base</th></tr>
	</thead>
	<tbody>
	<tr><td>K</td><td>Kilo Decimal Byte</td><td>1_000</td></tr>
	<tr><td>M</td><td>Mega Decimal Byte</td><td>1_000_000</td></tr>
	<tr><td>G</td><td>Giga Decimal Byte</td><td>1_000_000_000</td></tr>
	<tr><td>T</td><td>Tera Decimal Byte</td><td>1_000_000_000_000</td></tr>
	<tr><td>P</td><td>Peta Decimal Byte</td><td>1_000_000_000_000_000</td></tr>
	<tr><td>Ki</td><td>Kilo Binary Byte</td><td>1024</td></tr>
	<tr><td>Mi</td><td>Mega Binary Byte</td><td>1024 * 1024</td></tr>
	<tr><td>Gi</td><td>Giga Binary Byte</td><td>1024 * 1024 * 1024</td></tr>
	<tr><td>Ti</td><td>Tera Binary Byte</td><td>1024 * 1024 * 1024 * 1024</td></tr>
	<tr><td>Pi</td><td>Peta Binary Byte</td><td>1024 * 1024 * 1024 * 1024 * 1024</td></tr>
	<tr><td>KiB</td><td>Kilo Binary Byte</td><td>1024</td></tr>
	<tr><td>MiB</td><td>Mega Binary Byte</td><td>1024 * 1024</td></tr>
	<tr><td>GiB</td><td>Giga Binary Byte</td><td>1024 * 1024 * 1024</td></tr>
	<tr><td>TiB</td><td>Tera Binary Byte</td><td>1024 * 1024 * 1024 * 1024</td></tr>
	<tr><td>PiB</td><td>Peta Binary Byte</td><td>1024 * 1024 * 1024 * 1024 * 1024</td></tr>
	</tbody>
	</table>
	<p>Unit is case-insensitive. <code>k</code>, <code>kib</code>, <code>ki</code>, <code>KiB</code>, <code>Ki</code>, <code>kiB</code> are all acceptable.</p>
	<p>Here are some examples</p>
	<pre><code class="hljs css language-properties"><span class="hljs-comment"># 1G bytes = 1_000_000_000 bytes</span>
	<span class="hljs-meta">druid.cache.sizeInBytes</span>=<span class="hljs-string">1g </span>
	</code></pre>
	<pre><code class="hljs css language-properties"><span class="hljs-comment"># 256MiB bytes = 256 * 1024 * 1024 bytes</span>
	<span class="hljs-meta">druid.cache.sizeInBytes</span>=<span class="hljs-string">256MiB </span>
	</code></pre>
	<pre><code class="hljs css language-properties"><span class="hljs-comment"># 256Mi = 256MiB = 256 * 1024 * 1024 bytes</span>
	<span class="hljs-meta">druid.cache.sizeInBytes</span>=<span class="hljs-string">256Mi</span>
	</code></pre>
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