apache
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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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<section>
<h2><a name="Hadoop_Docker"></a>Hadoop Docker</h2><section>
<h3><a name="Running_from_existing_setups"></a>Running from existing setups</h3>
<p>There are special branches for running hadoop in docker.</p>
<p>The <code>docker-hadoop-runner*</code> branches contain scripts that set up base images that can be used for running any Hadoop version.</p>
<ul>

<li><a class="externalLink" href="https://github.com/apache/hadoop/tree/docker-hadoop-runner-latest">docker-hadoop-runner-latest</a></li>
<li><a class="externalLink" href="https://github.com/apache/hadoop/tree/docker-hadoop-runner-jdk11">docker-hadoop-runner-jdk11</a></li>
<li><a class="externalLink" href="https://github.com/apache/hadoop/tree/docker-hadoop-runner-jdk8">docker-hadoop-runner-jdk8</a></li>
<li><a class="externalLink" href="https://github.com/apache/hadoop/tree/docker-hadoop-runner">docker-hadoop-runner</a></li>
</ul>
<p>The <code>docker-hadoop*</code> branches can be used for running a specific version.</p>
<ul>

<li><a class="externalLink" href="https://github.com/apache/hadoop/tree/docker-hadoop-3">docker-hadoop-3</a></li>
<li><code>hadoop-3.3.6</code></li>
<li><a class="externalLink" href="https://github.com/apache/hadoop/tree/docker-hadoop-2">docker-hadoop-2</a></li>
<li><code>hadoop-2.10.2</code></li>
</ul></section><section>
<h3><a name="Running_from_the_source_code"></a>Running from the source code</h3>
<p>There is a setup under <code>hadoop-dist</code> that contains Docker Compose definitions for running the current version of Hadoop in a multi-node docker environment.</p>
<p>This is meant for testing code changes locally and debugging.</p>
<p>The base image used by the Docker setup is built as part of the maven lifecycle. The distribution files generated while building the project with the <code>-Pdist</code> profile enabled, will be used for running hadoop inside the containers.</p>
<p>In order to start the docker environment you need to do the following * Build the project, using the <code>-Pdist</code> profile</p>

<div class="source">
<div class="source">
<pre>&gt; mvn clean install -Dmaven.javadoc.skip=true -DskipTests -DskipShade -Pdist,src
</pre></div></div>

<ul>

<li>From the project root, navigate under the docker-compose dir under the generated dist directory</li>
</ul>

<div class="source">
<div class="source">
<pre>&gt; cd hadoop-dist/target/hadoop-&lt;current-version&gt;/compose/hadoop
</pre></div></div>

<ul>

<li>Start the docker environment</li>
</ul>

<div class="source">
<div class="source">
<pre>&gt; docker-compose up -d --scale datanode=3
</pre></div></div>

<ul>

<li>Connect to a container to execute commands</li>
</ul>

<div class="source">
<div class="source">
<pre>&gt; docker exec -it hadoop_datanode_1 bash
bash-4.2$ hdfs dfs -mkdir /test
</pre></div></div>
</section><section>
<h3><a name="Config_files"></a>Config files</h3>
<p>To add or remove properties from the <code>core-site.xml</code>, <code>hdfs-site.xml</code>, etc. files used in the docker environment, simply edit the <code>config</code> file before starting the containers. The changes will be persisted in the docker environment.</p></section></section>
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