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                                                   <h5>General</h5>
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                       <h5>Common</h5>
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                       <h5>MapReduce</h5>
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                       <h5>YARN</h5>
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                       <h5>YARN REST APIs</h5>
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                       <h5>YARN Service</h5>
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                       <h5>Hadoop Compatible File Systems</h5>
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                       <h5>Auth</h5>
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                       <h5>Tools</h5>
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                       <h5>Configuration</h5>
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<h1>Hadoop: CLI MiniCluster.</h1>
<ul>
<li><a href="#Purpose">Purpose</a></li>
<li><a href="#Hadoop_Tarball">Hadoop Tarball</a></li>
<li><a href="#Running_the_MiniCluster">Running the MiniCluster</a></li></ul>
<section>
<h2><a name="Purpose"></a>Purpose</h2>
<p>Using the CLI MiniCluster, users can simply start and stop a single-node Hadoop cluster with a single command, and without the need to set any environment variables or manage configuration files. The CLI MiniCluster starts both a <code>YARN</code>/<code>MapReduce</code> &amp; <code>HDFS</code> clusters.</p>
<p>This is useful for cases where users want to quickly experiment with a real Hadoop cluster or test non-Java programs that rely on significant Hadoop functionality.</p></section><section>
<h2><a name="Hadoop_Tarball"></a>Hadoop Tarball</h2>
<p>You should be able to obtain the Hadoop tarball from the release. Also, you can directly create a tarball from the source:</p>

<div class="source">
<div class="source">
<pre>$ mvn clean install -DskipTests
$ mvn package -Pdist -Dtar -DskipTests -Dmaven.javadoc.skip
</pre></div></div>

<p>The tarball should be available in <code>hadoop-dist/target/</code> directory.</p></section><section>
<h2><a name="Running_the_MiniCluster"></a>Running the MiniCluster</h2>
<p>From inside the root directory of the extracted tarball, you can start the CLI MiniCluster using the following command:</p>

<div class="source">
<div class="source">
<pre>$ bin/mapred minicluster -format
</pre></div></div>

<p>The format option is required when running the minicluster for the first time, from next time -format option isn&#x2019;t required.</p>
<p>There are a number of command line arguments that the users can use to control which services to start, and to pass other configuration properties. The available command line arguments:</p>

<div class="source">
<div class="source">
<pre>$ -D &lt;property=value&gt;    Options to pass into configuration object
$ -datanodes &lt;arg&gt;       How many datanodes to start (default 1)
$ -format                Format the DFS (default false)
$ -help                  Prints option help.
$ -jhsport &lt;arg&gt;         JobHistoryServer port (default 0--we choose)
$ -namenode &lt;arg&gt;        URL of the namenode (default is either the DFS
$                        cluster or a temporary dir)
$ -nnport &lt;arg&gt;          NameNode port (default 0--we choose)
$ -nnhttpport &lt;arg&gt;      NameNode HTTP port (default 0--we choose)
$ -nodemanagers &lt;arg&gt;    How many nodemanagers to start (default 1)
$ -nodfs                 Don't start a mini DFS cluster
$ -nomr                  Don't start a mini MR cluster
$ -rmport &lt;arg&gt;          ResourceManager port (default 0--we choose)
$ -writeConfig &lt;path&gt;    Save configuration to this XML file.
$ -writeDetails &lt;path&gt;   Write basic information to this JSON file.
</pre></div></div>

<p>To display this full list of available arguments, the user can pass the <code>-help</code> argument to the above command.</p></section>
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