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-title: Configuring Apache Kudu
-layout: default
-active_nav: docs
-last_updated: 'Last updated 2018-06-15 07:22:05 PDT'
----
-<!--
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-Licensed under the Apache License, Version 2.0 (the "License");
-you may not use this file except in compliance with the License.
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- http://www.apache.org/licenses/LICENSE-2.0
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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.
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-limitations under the License.
--->
-
-
-<div class="container">
- <div class="row">
- <div class="col-md-9">
-
-<h1>Configuring Apache Kudu</h1>
- <div id="preamble">
-<div class="sectionbody">
-<div class="admonitionblock note">
-<table>
-<tr>
-<td class="icon">
-<i class="fa icon-note" title="Note"></i>
-</td>
-<td class="content">
-Kudu is easier to configure with <a
href="http://www.cloudera.com/content/www/en-us/products/cloudera-manager.html";>Cloudera
Manager</a>
-than in a standalone installation. See Cloudera’s
-<a
href="http://www.cloudera.com/documentation/kudu/latest/topics/kudu_installation.html";>Kudu
documentation</a>
-for more details about using Kudu with Cloudera Manager.
-</td>
-</tr>
-</table>
-</div>
-</div>
-</div>
-<div class="sect1">
-<h2 id="_configure_kudu"><a class="link" href="#_configure_kudu">Configure
Kudu</a></h2>
-<div class="sectionbody">
-<div class="sect2">
-<h3 id="_configuration_basics"><a class="link"
href="#_configuration_basics">Configuration Basics</a></h3>
-<div class="paragraph">
-<p>To configure the behavior of each Kudu process, you can pass command-line
flags when
-you start it, or read those options from configuration files by passing them
using
-one or more <code>--flagfile=<file></code> options. You can even include
the
-<code>--flagfile</code> option within your configuration file to include other
files. Learn more about gflags
-by reading <a href="https://gflags.github.io/gflags/";>its
documentation</a>.</p>
-</div>
-<div class="paragraph">
-<p>You can place options for masters and tablet servers into the same
configuration
-file, and each will ignore options that do not apply.</p>
-</div>
-<div class="paragraph">
-<p>Flags can be prefixed with either one or two <code>-</code> characters. This
-documentation standardizes on two: <code>--example_flag</code>.</p>
-</div>
-</div>
-<div class="sect2">
-<h3 id="_discovering_configuration_options"><a class="link"
href="#_discovering_configuration_options">Discovering Configuration
Options</a></h3>
-<div class="paragraph">
-<p>Only the most common configuration options are documented here. For a more
exhaustive
-list of configuration options, see the <a
href="configuration_reference.html">Configuration Reference</a>.</p>
-</div>
-<div class="paragraph">
-<p>To see all configuration flags for a given executable, run it with the
<code>--help</code> option.
-Take care when configuring undocumented flags, as not every possible
-configuration has been tested, and undocumented options are not guaranteed to
be
-maintained in future releases.</p>
-</div>
-</div>
-<div class="sect2">
-<h3 id="directory_configuration"><a class="link"
href="#directory_configuration">Directory Configurations</a></h3>
-<div class="paragraph">
-<p>Every Kudu node requires the specification of directory flags. The
-<code>--fs_wal_dir</code> configuration indicates where Kudu will place its
write-ahead
-logs. The <code>--fs_metadata_dir</code> configuration indicates where Kudu
will place
-metadata for each tablet. It is recommended, although not necessary, that these
-directories be placed on a high-performance drives with high bandwidth and low
-latency, e.g. solid-state drives. If <code>--fs_metadata_dir</code> is not
specified,
-metadata will be placed in the directory specified by
<code>--fs_wal_dir</code>.</p>
-</div>
-<div class="paragraph">
-<p>The <code>--fs_data_dirs</code> configuration indicates where Kudu will
write its data
-blocks. This is a comma-separated list of directories; if multiple values are
-specified, data will be striped across the directories. If not specified, data
-blocks will be placed in the directory specified by
<code>--fs_wal_dir</code>.</p>
-</div>
-<div class="paragraph">
-<p>Additionally, <code>--fs_wal_dir</code> and <code>--fs_metadata_dir</code>
may be the same as <em>one
-of</em> the directories listed in <code>--fs_data_dirs</code>, but must not be
sub-directories
-of any of them.</p>
-</div>
-<div class="admonitionblock warning">
-<table>
-<tr>
-<td class="icon">
-<i class="fa icon-warning" title="Warning"></i>
-</td>
-<td class="content">
-Once <code>--fs_data_dirs</code> is set, extra tooling is required to change
it.
-For more details, see the <a href="administration.html#change_dir_config">Kudu
-Administration docs</a>.
-</td>
-</tr>
-</table>
-</div>
-<div class="admonitionblock note">
-<table>
-<tr>
-<td class="icon">
-<i class="fa icon-note" title="Note"></i>
-</td>
-<td class="content">
-The <code>--fs_wal_dir</code> and <code>--fs_metadata_dir</code>
configurations can be changed,
-provided the contents of the directories are also moved to match the flags.
-</td>
-</tr>
-</table>
-</div>
-</div>
-<div class="sect2">
-<h3 id="_configuring_the_kudu_master"><a class="link"
href="#_configuring_the_kudu_master">Configuring the Kudu Master</a></h3>
-<div class="paragraph">
-<p>To see all available configuration options for the <code>kudu-master</code>
executable, run it
-with the <code>--help</code> option:</p>
-</div>
-<div class="listingblock">
-<div class="content">
-<pre>$ kudu-master --help</pre>
-</div>
-</div>
-<table class="tableblock frame-all grid-all spread">
-<caption class="title">Table 1. Supported Configuration Flags for Kudu
Masters</caption>
-<colgroup>
-<col style="width: 25%;">
-<col style="width: 25%;">
-<col style="width: 25%;">
-<col style="width: 25%;">
-</colgroup>
-<thead>
-<tr>
-<th class="tableblock halign-left valign-top">Flag</th>
-<th class="tableblock halign-left valign-top">Valid Options</th>
-<th class="tableblock halign-left valign-top">Default</th>
-<th class="tableblock halign-left valign-top">Description</th>
-</tr>
-</thead>
-<tbody>
-<tr>
-<td class="tableblock halign-left valign-top"><p
class="tableblock"><code>--master_addresses</code></p></td>
-<td class="tableblock halign-left valign-top"><p
class="tableblock">string</p></td>
-<td class="tableblock halign-left valign-top"><p
class="tableblock"><code>localhost</code></p></td>
-<td class="tableblock halign-left valign-top"><p
class="tableblock">Comma-separated list of all the RPC
-addresses for Master consensus-configuration. If not specified, assumes a
standalone Master.</p></td>
-</tr>
-<tr>
-<td class="tableblock halign-left valign-top"><p
class="tableblock"><code>--fs_data_dirs</code></p></td>
-<td class="tableblock halign-left valign-top"><p
class="tableblock">string</p></td>
-<td class="tableblock halign-left valign-top"></td>
-<td class="tableblock halign-left valign-top"><p class="tableblock">List of
directories where the Master will place its data blocks.</p></td>
-</tr>
-<tr>
-<td class="tableblock halign-left valign-top"><p
class="tableblock"><code>--fs_metadata_dir</code></p></td>
-<td class="tableblock halign-left valign-top"><p
class="tableblock">string</p></td>
-<td class="tableblock halign-left valign-top"></td>
-<td class="tableblock halign-left valign-top"><p class="tableblock">The
directory where the Master will place its tablet metadata.</p></td>
-</tr>
-<tr>
-<td class="tableblock halign-left valign-top"><p
class="tableblock"><code>--fs_wal_dir</code></p></td>
-<td class="tableblock halign-left valign-top"><p
class="tableblock">string</p></td>
-<td class="tableblock halign-left valign-top"></td>
-<td class="tableblock halign-left valign-top"><p class="tableblock">The
directory where the Master will place its write-ahead logs.</p></td>
-</tr>
-<tr>
-<td class="tableblock halign-left valign-top"><p
class="tableblock"><code>--log_dir</code></p></td>
-<td class="tableblock halign-left valign-top"><p
class="tableblock">string</p></td>
-<td class="tableblock halign-left valign-top"><p
class="tableblock"><code>/tmp</code></p></td>
-<td class="tableblock halign-left valign-top"><p class="tableblock">The
directory to store Master log files.</p></td>
-</tr>
-</tbody>
-</table>
-<div class="paragraph">
-<p>For the full list of flags for masters, see the
-<a href="configuration_reference.html#master_configuration_reference">Kudu
Master Configuration Reference</a>.</p>
-</div>
-</div>
-<div class="sect2">
-<h3 id="_configuring_tablet_servers"><a class="link"
href="#_configuring_tablet_servers">Configuring Tablet Servers</a></h3>
-<div class="paragraph">
-<p>To see all available configuration options for the
<code>kudu-tserver</code> executable,
-run it with the <code>--help</code> option:</p>
-</div>
-<div class="listingblock">
-<div class="content">
-<pre>$ kudu-tserver --help</pre>
-</div>
-</div>
-<table class="tableblock frame-all grid-all spread">
-<caption class="title">Table 2. Supported Configuration Flags for Kudu Tablet
Servers</caption>
-<colgroup>
-<col style="width: 25%;">
-<col style="width: 25%;">
-<col style="width: 25%;">
-<col style="width: 25%;">
-</colgroup>
-<thead>
-<tr>
-<th class="tableblock halign-left valign-top">Flag</th>
-<th class="tableblock halign-left valign-top">Valid Options</th>
-<th class="tableblock halign-left valign-top">Default</th>
-<th class="tableblock halign-left valign-top">Description</th>
-</tr>
-</thead>
-<tbody>
-<tr>
-<td class="tableblock halign-left valign-top"><p
class="tableblock">--fs_data_dirs</p></td>
-<td class="tableblock halign-left valign-top"><p
class="tableblock">string</p></td>
-<td class="tableblock halign-left valign-top"></td>
-<td class="tableblock halign-left valign-top"><p class="tableblock">List of
directories where the Tablet Server will place its data blocks.</p></td>
-</tr>
-<tr>
-<td class="tableblock halign-left valign-top"><p
class="tableblock">--fs_metadata_dir</p></td>
-<td class="tableblock halign-left valign-top"><p
class="tableblock">string</p></td>
-<td class="tableblock halign-left valign-top"></td>
-<td class="tableblock halign-left valign-top"><p class="tableblock">The
directory where the Tablet Server will place its tablet metadata.</p></td>
-</tr>
-<tr>
-<td class="tableblock halign-left valign-top"><p
class="tableblock">--fs_wal_dir</p></td>
-<td class="tableblock halign-left valign-top"><p
class="tableblock">string</p></td>
-<td class="tableblock halign-left valign-top"></td>
-<td class="tableblock halign-left valign-top"><p class="tableblock">The
directory where the Tablet Server will place its write-ahead logs.</p></td>
-</tr>
-<tr>
-<td class="tableblock halign-left valign-top"><p
class="tableblock">--log_dir</p></td>
-<td class="tableblock halign-left valign-top"><p
class="tableblock">string</p></td>
-<td class="tableblock halign-left valign-top"><p
class="tableblock">/tmp</p></td>
-<td class="tableblock halign-left valign-top"><p class="tableblock">The
directory to store Tablet Server log files</p></td>
-</tr>
-<tr>
-<td class="tableblock halign-left valign-top"><p
class="tableblock">--tserver_master_addrs</p></td>
-<td class="tableblock halign-left valign-top"><p
class="tableblock">string</p></td>
-<td class="tableblock halign-left valign-top"><p
class="tableblock"><code>127.0.0.1:7051</code></p></td>
-<td class="tableblock halign-left valign-top"><p class="tableblock">Comma
separated
-addresses of the masters which the tablet server should connect to. The masters
-do not read this flag.</p></td>
-</tr>
-<tr>
-<td class="tableblock halign-left valign-top"><p
class="tableblock">--block_cache_capacity_mb</p></td>
-<td class="tableblock halign-left valign-top"><p
class="tableblock">integer</p></td>
-<td class="tableblock halign-left valign-top"><p
class="tableblock">512</p></td>
-<td class="tableblock halign-left valign-top"><p class="tableblock">Maximum
amount of memory allocated to the Kudu Tablet Server’s block
cache.</p></td>
-</tr>
-<tr>
-<td class="tableblock halign-left valign-top"><p
class="tableblock">--memory_limit_hard_bytes</p></td>
-<td class="tableblock halign-left valign-top"><p
class="tableblock">integer</p></td>
-<td class="tableblock halign-left valign-top"><p
class="tableblock">4294967296</p></td>
-<td class="tableblock halign-left valign-top"><p class="tableblock">Maximum
amount of memory a Tablet Server can consume before it starts rejecting all
incoming writes.</p></td>
-</tr>
-</tbody>
-</table>
-<div class="paragraph">
-<p>For the full list of flags for tablet servers, see the
-<a
href="configuration_reference.html#tablet_server_configuration_reference">Kudu
Tablet Server Configuration Reference</a>.</p>
-</div>
-</div>
-</div>
-</div>
-<div class="sect1">
-<h2 id="_next_steps"><a class="link" href="#_next_steps">Next Steps</a></h2>
-<div class="sectionbody">
-<div class="ulist">
-<ul>
-<li>
-<p><a href="quickstart.html">Get Started With Kudu</a></p>
-</li>
-<li>
-<p><a href="developing.html">Developing Applications With Kudu</a></p>
-</li>
-</ul>
-</div>
-</div>
-</div>
- </div>
- <div class="col-md-3">
-
- <div id="toc" data-spy="affix" data-offset-top="70">
- <ul>
-
- <li>
-
- <a href="index.html">Introducing Kudu</a>
- </li>
- <li>
-
- <a href="release_notes.html">Kudu Release Notes</a>
- </li>
- <li>
-
- <a href="quickstart.html">Getting Started with Kudu</a>
- </li>
- <li>
-
- <a href="installation.html">Installation Guide</a>
- </li>
- <li>
-<span class="active-toc">Configuring Kudu</span>
- <ul class="sectlevel1">
-<li><a href="#_configure_kudu">Configure Kudu</a>
-<ul class="sectlevel2">
-<li><a href="#_configuration_basics">Configuration Basics</a></li>
-<li><a href="#_discovering_configuration_options">Discovering Configuration
Options</a></li>
-<li><a href="#directory_configuration">Directory Configurations</a></li>
-<li><a href="#_configuring_the_kudu_master">Configuring the Kudu
Master</a></li>
-<li><a href="#_configuring_tablet_servers">Configuring Tablet Servers</a></li>
-</ul>
-</li>
-<li><a href="#_next_steps">Next Steps</a></li>
-</ul>
- </li>
- <li>
-
- <a href="kudu_impala_integration.html">Using Impala with Kudu</a>
- </li>
- <li>
-
- <a href="administration.html">Administering Kudu</a>
- </li>
- <li>
-
- <a href="troubleshooting.html">Troubleshooting Kudu</a>
- </li>
- <li>
-
- <a href="developing.html">Developing Applications with Kudu</a>
- </li>
- <li>
-
- <a href="schema_design.html">Kudu Schema Design</a>
- </li>
- <li>
-
- <a href="security.html">Kudu Security</a>
- </li>
- <li>
-
- <a href="transaction_semantics.html">Kudu Transaction Semantics</a>
- </li>
- <li>
-
- <a href="background_tasks.html">Background Maintenance Tasks</a>
- </li>
- <li>
-
- <a href="configuration_reference.html">Kudu Configuration
Reference</a>
- </li>
- <li>
-
- <a href="command_line_tools_reference.html">Kudu Command Line Tools
Reference</a>
- </li>
- <li>
-
- <a href="known_issues.html">Known Issues and Limitations</a>
- </li>
- <li>
-
- <a href="contributing.html">Contributing to Kudu</a>
- </li>
- <li>
-
- <a href="export_control.html">Export Control Notice</a>
- </li>
- </ul>
- </div>
- </div>
- </div>
-</div>
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