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<h2>Hadoop MapReduce Next Generation - CLI MiniCluster.<a name="Hadoop_MapReduce_Next_Generation_-_CLI_MiniCluster."></a></h2>
<ul>
<li><a href="#Hadoop_MapReduce_Next_Generation_-_CLI_MiniCluster.">Hadoop MapReduce Next Generation - CLI MiniCluster.</a>
<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></li></ul>
<div class="section">
<h3><a name="Purpose">Purpose</a></h3>
<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 <tt>YARN</tt>/<tt>MapReduce</tt> &amp; <tt>HDFS</tt> 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></div>
<div class="section">
<h3><a name="Hadoop_Tarball">Hadoop Tarball</a></h3>
<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">
<pre>$ mvn clean install -DskipTests
$ mvn package -Pdist -Dtar -DskipTests -Dmaven.javadoc.skip</pre></div>
<p><b>NOTE:</b> You will need <a class="externalLink" href="http://code.google.com/p/protobuf/">protoc 2.5.0</a> installed.</p>
<p>The tarball should be available in <tt>hadoop-dist/target/</tt> directory. </p></div>
<div class="section">
<h3><a name="Running_the_MiniCluster">Running the MiniCluster</a></h3>
<p>From inside the root directory of the extracted tarball, you can start the CLI MiniCluster using the following command:</p>
<div class="source">
<pre>$ bin/hadoop jar ./share/hadoop/mapreduce/hadoop-mapreduce-client-jobclient-2.3.0-tests.jar minicluster -rmport RM_PORT -jhsport JHS_PORT</pre></div>
<p>In the example command above, <tt>RM_PORT</tt> and <tt>JHS_PORT</tt> should be replaced by the user's choice of these port numbers. If not specified, random free ports will be used.</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">
<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)
$ -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>
<p>To display this full list of available arguments, the user can pass the <tt>-help</tt> argument to the above command.</p></div></div>
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