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| <h1 class="title">Maven Artifacts for Apache Jena Elephas</h1> |
| |
| <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><!-- Hadoop Dependencies --> |
| <!-- Note these will be provided on the Hadoop cluster hence the provided |
| scope --> |
| <dependency> |
| <groupId>org.apache.hadoop</groupId> |
| <artifactId>hadoop-common</artifactId> |
| <version>2.6.0</version> |
| <scope>provided</scope> |
| </dependency> |
| <dependency> |
| <groupId>org.apache.hadoop</groupId> |
| <artifactId>hadoop-mapreduce-client-common</artifactId> |
| <version>2.6.0</version> |
| <scope>provided</scope> |
| </dependency> |
| </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>> 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><dependency> |
| <groupId>org.apache.jena</groupId> |
| <artifactId>jena-elephas-common</artifactId> |
| <version>x.y.z</version> |
| </dependency> |
| </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><dependency> |
| <groupId>org.apache.jena</groupId> |
| <artifactId>jena-elephas-io</artifactId> |
| <version>x.y.z</version> |
| </dependency> |
| </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><dependency> |
| <groupId>org.apache.jena</groupId> |
| <artifactId>jena-elephas-mapreduce</artifactId> |
| <version>x.y.z</version> |
| </dependency> |
| </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><dependency> |
| <groupId>org.apache.jena</groupId> |
| <artifactId>jena-elephas-stats</artifactId> |
| <version>x.y.z</version> |
| <classifier>hadoop-job</classifier> |
| </dependency></code></pre> |
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