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<h1 class="title">Maven Artifacts for Apache Jena Elephas</h1>
<main class="d-flex flex-xl-row flex-column">
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<h2 class="h6 sticky-top m-0 p-2 bg-body-tertiary">On this page</h2>
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<ul>
<li><a href="#using-alternative-hadoop-versions">Using Alternative Hadoop versions</a></li>
</ul>
</li>
</ul>
<ul>
<li><a href="#common-api">Common API</a></li>
<li><a href="#io-api">IO API</a></li>
<li><a href="#mapreduce">Map/Reduce</a></li>
<li><a href="#rdf-stats-demo">RDF Stats Demo</a></li>
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<p>The Apache Jena Elephas libraries for Apache Hadoop are a collection of maven artifacts which can be used individually
or together as desired. These are available from the same locations as any other Jena
artifact, see <a href="/download/maven.html">Using Jena with Maven</a> for more information.</p>
<h1 id="hadoop-dependencies">Hadoop Dependencies</h1>
<p>The first thing to note is that although our libraries depend on relevant Hadoop libraries these dependencies
are marked as <code>provided</code> and therefore are not transitive. This means that you may typically also need to
declare these basic dependencies as <code>provided</code> in your own POM:</p>
<pre><code>&lt;!-- Hadoop Dependencies --&gt;
&lt;!-- Note these will be provided on the Hadoop cluster hence the provided
scope --&gt;
&lt;dependency&gt;
&lt;groupId&gt;org.apache.hadoop&lt;/groupId&gt;
&lt;artifactId&gt;hadoop-common&lt;/artifactId&gt;
&lt;version&gt;2.6.0&lt;/version&gt;
&lt;scope&gt;provided&lt;/scope&gt;
&lt;/dependency&gt;
&lt;dependency&gt;
&lt;groupId&gt;org.apache.hadoop&lt;/groupId&gt;
&lt;artifactId&gt;hadoop-mapreduce-client-common&lt;/artifactId&gt;
&lt;version&gt;2.6.0&lt;/version&gt;
&lt;scope&gt;provided&lt;/scope&gt;
&lt;/dependency&gt;
</code></pre>
<h3 id="using-alternative-hadoop-versions">Using Alternative Hadoop versions</h3>
<p>If you wish to use a different Hadoop version then we suggest that you build the modules yourself from source which can be
found in the <code>jena-elephas</code> folder of our source release (available on the <a href="../download/">Downloads</a> page) or from our Git
repository (see <a href="../getting_involved/">Getting Involved</a> for details of the repository).</p>
<p>When building you need to set the <code>hadoop.version</code> property to the desired version e.g.</p>
<pre><code>&gt; mvn clean package -Dhadoop.version=2.4.1
</code></pre>
<p>Would build for Hadoop <code>2.4.1</code></p>
<p><strong>Note</strong> that we only support Hadoop 2.x APIs and so Elephas cannot be built for Hadoop 1.x</p>
<h1 id="jena-rdf-tools-for-apache-hadoop-artifacts">Jena RDF Tools for Apache Hadoop Artifacts</h1>
<h2 id="common-api">Common API</h2>
<p>The <code>jena-elephas-common</code> artifact provides common classes for enabling RDF on Hadoop. This is mainly
composed of relevant <code>Writable</code> implementations for the various supported RDF primitives.</p>
<pre><code>&lt;dependency&gt;
&lt;groupId&gt;org.apache.jena&lt;/groupId&gt;
&lt;artifactId&gt;jena-elephas-common&lt;/artifactId&gt;
&lt;version&gt;x.y.z&lt;/version&gt;
&lt;/dependency&gt;
</code></pre>
<h2 id="io-api">IO API</h2>
<p>The <a href="io.html">IO API</a> artifact provides support for reading and writing RDF in Hadoop:</p>
<pre><code>&lt;dependency&gt;
&lt;groupId&gt;org.apache.jena&lt;/groupId&gt;
&lt;artifactId&gt;jena-elephas-io&lt;/artifactId&gt;
&lt;version&gt;x.y.z&lt;/version&gt;
&lt;/dependency&gt;
</code></pre>
<h2 id="mapreduce">Map/Reduce</h2>
<p>The <a href="mapred.html">Map/Reduce</a> artifact provides various building block mapper and reducer implementations
to help you get started writing Map/Reduce jobs over RDF data quicker:</p>
<pre><code>&lt;dependency&gt;
&lt;groupId&gt;org.apache.jena&lt;/groupId&gt;
&lt;artifactId&gt;jena-elephas-mapreduce&lt;/artifactId&gt;
&lt;version&gt;x.y.z&lt;/version&gt;
&lt;/dependency&gt;
</code></pre>
<h2 id="rdf-stats-demo">RDF Stats Demo</h2>
<p>The <a href="demo.html">RDF Stats Demo</a> artifact is a Hadoop job jar which can be used to run some simple demo applications over your
own RDF data:</p>
<pre><code>&lt;dependency&gt;
&lt;groupId&gt;org.apache.jena&lt;/groupId&gt;
&lt;artifactId&gt;jena-elephas-stats&lt;/artifactId&gt;
&lt;version&gt;x.y.z&lt;/version&gt;
&lt;classifier&gt;hadoop-job&lt;/classifier&gt;
&lt;/dependency&gt;</code></pre>
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<li><a href="#using-alternative-hadoop-versions">Using Alternative Hadoop versions</a></li>
</ul>
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<ul>
<li><a href="#common-api">Common API</a></li>
<li><a href="#io-api">IO API</a></li>
<li><a href="#mapreduce">Map/Reduce</a></li>
<li><a href="#rdf-stats-demo">RDF Stats Demo</a></li>
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