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| <p>To run a DistributedLog ensemble, you'll need a set of Zookeeper |
| nodes. There is no constraints on the number of Zookeeper nodes you |
| need. One node is enough to run your cluster, but for reliability |
| purpose, you should run at least 3 nodes.</p> |
| <div class="section" id="version"> |
| <h2>Version</h2> |
| <p>DistributedLog leverages zookeepr <cite>multi</cite> operations for metadata updates. |
| So the minimum version of zookeeper is 3.4.*. We recommend to run stable |
| zookeeper version <cite>3.4.8</cite>.</p> |
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| <div class="section" id="run-zookeeper-from-distributedlog-source"> |
| <h2>Run ZooKeeper from distributedlog source</h2> |
| <p>Since <cite>zookeeper</cite> is one of the dependency of <cite>distributedlog-service</cite>. You could simply |
| run <cite>zookeeper</cite> servers using same set of scripts provided in <cite>distributedlog-service</cite>. |
| In the following sections, we will describe how to run zookeeper using the scripts provided |
| in <cite>distributedlog-service</cite>.</p> |
| <div class="section" id="build"> |
| <h3>Build</h3> |
| <p>First of all, build DistributedLog:</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 install -DskipTests |
| </span></code></pre></td></tr></table></div></figure></div> |
| <div class="section" id="configuration"> |
| <h3>Configuration</h3> |
| <p>The configuration file <cite>zookeeper.conf.template</cite> under <cite>distributedlog-service/conf</cite> is a template of |
| production configuration to run a zookeeper node. Most of the configuration settings are good for |
| production usage. You might need to configure following settings according to your environment and |
| hardware platform.</p> |
| <div class="section" id="ensemble"> |
| <h4>Ensemble</h4> |
| <p>You need to configure the zookeeper servers form this ensemble as below:</p> |
| <pre class="literal-block"> |
| server.1=127.0.0.1:2710:3710:participant;0.0.0.0:2181 |
| </pre> |
| <p>Please check <a class="reference external" href="http://zookeeper.apache.org/">zookeeper</a> website for more configurations.</p> |
| </div> |
| <div class="section" id="disks"> |
| <h4>Disks</h4> |
| <p>You need to configure following settings according to the disk layout of your hardware. |
| It is recommended to put <cite>dataLogDir</cite> under a separated disk from others for performance.</p> |
| <pre class="literal-block"> |
| # the directory where the snapshot is stored. |
| dataDir=/tmp/data/zookeeper |
| |
| # where txlog are written |
| dataLogDir=/tmp/data/zookeeper/txlog |
| </pre> |
| </div> |
| </div> |
| <div class="section" id="run"> |
| <h3>Run</h3> |
| <p>As <cite>zookeeper</cite> is shipped as part of <cite>distributedlog-service</cite>, you could use the <cite>dlog-daemon.sh</cite> |
| script to start <cite>zookeeper</cite> as daemon thread.</p> |
| <p>Start the zookeeper:</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>$ ./distributedlog-service/bin/dlog-daemon.sh start zookeeper /path/to/zookeeper.conf |
| </span></code></pre></td></tr></table></div></figure><p>Stop the zookeeper:</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>$ ./distributedlog-service/bin/dlog-daemon.sh stop zookeeper |
| </span></code></pre></td></tr></table></div></figure><p>Please check <a class="reference external" href="http://zookeeper.apache.org/">zookeeper</a> website for more details.</p> |
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