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<div class="contents topic" id="this-page-covers-how-to-build-distributedlog-0-4-0-incubating-from-sources">
<p class="topic-title first">This page covers how to build DistributedLog 0.4.0-incubating from sources.</p>
<ul class="simple">
<li><a class="reference internal" href="#build-distributedlog" id="id1">Build DistributedLog</a><ul>
<li><a class="reference internal" href="#build" id="id2">Build</a></li>
<li><a class="reference internal" href="#scala-versions" id="id3">Scala Versions</a></li>
</ul>
</li>
</ul>
</div>
<div class="section" id="build-distributedlog">
<h2><a class="toc-backref" href="#id1">Build DistributedLog</a></h2>
<p>In order to build DistributedLog you need the source code. Either <a class="reference external" href="/docs/0.4.0-incubating/download">download the source of a release</a> or <a class="reference external" href="https://github.com/apache/distributedlog">clone the git repository</a>.</p>
<p>In addition you need <strong>Maven 3</strong> and a <strong>JDK</strong> (Java Development Kit). DistributedLog requires <strong>at least Java 7</strong> to build. We recommend using Java 8.</p>
<p>To clone from git, enter:</p>
<figure class="code"><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class="line-number">1</span>
</pre></td><td class="code"><pre><code class="bash"><span class="line"><span></span>git clone https://github.com/apache/distributedlog
</span></code></pre></td></tr></table></div></figure><p>The simplest way of building DistributedLog is by running:</p>
<figure class="code"><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class="line-number">1</span>
</pre></td><td class="code"><pre><code class="bash"><span class="line"><span></span>mvn clean package -DskipTests
</span></code></pre></td></tr></table></div></figure><p>This instructs <a class="reference external" href="http://maven.apache.org">Maven</a> (<cite>mvn</cite>) to first remove all existing builds (<cite>clean</cite>) and then create a new DistributedLog package(<cite>package</cite>). The <cite>-DskipTests</cite> command prevents Maven from executing the tests.</p>
<div class="section" id="build">
<h3><a class="toc-backref" href="#id2">Build</a></h3>
<ul class="simple">
<li>Build all the components without running tests</li>
</ul>
<figure class="code"><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class="line-number">1</span>
</pre></td><td class="code"><pre><code class="bash"><span class="line"><span></span>mvn clean package -DskipTests
</span></code></pre></td></tr></table></div></figure><ul class="simple">
<li>Build all the components and run all the tests</li>
</ul>
<figure class="code"><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class="line-number">1</span>
</pre></td><td class="code"><pre><code class="bash"><span class="line"><span></span>mvn clean package
</span></code></pre></td></tr></table></div></figure><ul class="simple">
<li>Build a single component: as distributedlog is using shade plugin. shade only run when packaging so pre-install the dependencies before building a single component.</li>
</ul>
<figure class="code"><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class="line-number">1</span>
<span class="line-number">2</span>
</pre></td><td class="code"><pre><code class="bash"><span class="line"><span></span>mvn clean install -DskipTests
</span><span class="line">mvn -pl :&lt;module-name&gt; package <span class="o">[</span>-DskipTests<span class="o">]</span> // example: mvn-pl :distributedlog-core package
</span></code></pre></td></tr></table></div></figure><ul class="simple">
<li>Test a single class: as distributedlog is using shade plugin. shade only run when packaging so pre-install the dependencies before building a single component.</li>
</ul>
<figure class="code"><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class="line-number">1</span>
<span class="line-number">2</span>
</pre></td><td class="code"><pre><code class="bash"><span class="line"><span></span>mvn clean install -DskipTests
</span><span class="line">mvn -pl :&lt;module-name&gt; clean <span class="nb">test</span> -Dtest<span class="o">=</span>&lt;test-class-name&gt;
</span></code></pre></td></tr></table></div></figure></div>
<div class="section" id="scala-versions">
<h3><a class="toc-backref" href="#id3">Scala Versions</a></h3>
<p>DistributedLog has dependencies such as <a class="reference external" href="https://twitter.github.io/util/">Twitter Util</a>, <a class="reference external" href="https://twitter.github.io/finagle/">Finagle</a> written in <a class="reference external" href="http://scala-lang.org">Scala</a>. Users of the Scala API and libraries may have to match the Scala version of DistributedLog with the Scala version of their projects (because Scala is not strictly backwards compatible).</p>
<p><strong>By default, DistributedLog is built with the Scala 2.11</strong>. To build DistributedLog with Scala <em>2.10</em>, you can change the default Scala <em>binary version</em> with the following script:</p>
<figure class="code"><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class="line-number">1</span>
<span class="line-number">2</span>
<span class="line-number">3</span>
<span class="line-number">4</span>
</pre></td><td class="code"><pre><code class="bash"><span class="line"><span></span><span class="c1"># Switch Scala binary version between 2.10 and 2.11</span>
</span><span class="line">tools/change-scala-version.sh <span class="m">2</span>.10
</span><span class="line"><span class="c1"># Build with Scala version 2.10</span>
</span><span class="line">mvn clean install -DskipTests
</span></code></pre></td></tr></table></div></figure><p>DistributedLog is developed against Scala <em>2.11</em> and tested additionally against Scala <em>2.10</em>. These two versions are known to be compatible. Earlier versions (like Scala <em>2.9</em>) are <em>not</em> compatible.</p>
<p>Newer versions may be compatible, depending on breaking changes in the language features used by DistributedLog's dependencies, and the availability of DistributedLog's dependencies in those Scala versions.</p>
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