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| <li><a href="/docs/0.9.0/interpreter/pig.html">Pig</a></li> |
| <li><a href="/docs/0.9.0/interpreter/postgresql.html">Postgresql, HAWQ</a></li> |
| <li><a href="/docs/0.9.0/interpreter/sap.html">SAP</a></li> |
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| <li class="title"><span>Extending Zeppelin</span></li> |
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| |
| <h1>Lens Interpreter for Apache Zeppelin</h1> |
| |
| <div id="toc"></div> |
| |
| <h2>Overview</h2> |
| |
| <p><a href="https://lens.apache.org/">Apache Lens</a> provides an Unified Analytics interface. Lens aims to cut the Data Analytics silos by providing a single view of data across multiple tiered data stores and optimal execution environment for the analytical query. It seamlessly integrates Hadoop with traditional data warehouses to appear like one.</p> |
| |
| <p><img src="/docs/0.9.0/assets/themes/zeppelin/img/docs-img/lens-logo.png" alt="Apache Lens"></p> |
| |
| <h2>Installing and Running Lens</h2> |
| |
| <p>In order to use Lens interpreters, you may install Apache Lens in some simple steps:</p> |
| |
| <ol> |
| <li>Download Lens for latest version from <a href="http://www.apache.org/dyn/closer.lua/lens/2.3-beta">the ASF</a>. Or the older release can be found <a href="http://archive.apache.org/dist/lens/">in the Archives</a>.</li> |
| <li>Before running Lens, you have to set HIVE<em>HOME and HADOOP</em>HOME. If you want to get more information about this, please refer to <a href="http://lens.apache.org/lenshome/install-and-run.html#Installation">here</a>. Lens also provides Pseudo Distributed mode. <a href="http://lens.apache.org/lenshome/pseudo-distributed-setup.html">Lens pseudo-distributed setup</a> is done by using <a href="https://www.docker.com/">docker</a>. Hive server and hadoop daemons are run as separate processes in lens pseudo-distributed setup.</li> |
| <li>Now, you can start lens server (or stop).</li> |
| </ol> |
| <div class="highlight"><pre><code class="bash language-bash" data-lang="bash">./bin/lens-ctl start <span class="c"># (or stop)</span> |
| </code></pre></div> |
| <h2>Configuring Lens Interpreter</h2> |
| |
| <p>At the "Interpreters" menu, you can edit Lens interpreter or create new one. Zeppelin provides these properties for Lens.</p> |
| |
| <table class="table-configuration"> |
| <tr> |
| <th>Property Name</th> |
| <th>value</th> |
| <th>Description</th> |
| </tr> |
| <tr> |
| <td>lens.client.dbname</td> |
| <td>default</td> |
| <td>The database schema name</td> |
| </tr> |
| <tr> |
| <td>lens.query.enable.persistent.resultset</td> |
| <td>false</td> |
| <td>Whether to enable persistent resultset for queries. When enabled, server will fetch results from driver, custom format them if any and store in a configured location. The file name of query output is queryhandle-id, with configured extensions</td> |
| </tr> |
| <tr> |
| <td>lens.server.base.url</td> |
| <td>http://hostname:port/lensapi</td> |
| <td>The base url for the lens server. you have to edit "hostname" and "port" that you may use(ex. http://0.0.0.0:9999/lensapi)</td> |
| </tr> |
| <tr> |
| <td>lens.session.cluster.user </td> |
| <td>default</td> |
| <td>Hadoop cluster username</td> |
| </tr> |
| <tr> |
| <td>zeppelin.lens.maxResult</td> |
| <td>1000</td> |
| <td>Max number of rows to display</td> |
| </tr> |
| <tr> |
| <td>zeppelin.lens.maxThreads</td> |
| <td>10</td> |
| <td>If concurrency is true then how many threads?</td> |
| </tr> |
| <tr> |
| <td>zeppelin.lens.run.concurrent</td> |
| <td>true</td> |
| <td>Run concurrent Lens Sessions</td> |
| </tr> |
| <tr> |
| <td>xxx</td> |
| <td>yyy</td> |
| <td>anything else from [Configuring lens server](https://lens.apache.org/admin/config-server.html)</td> |
| </tr> |
| </table> |
| |
| <p><img src="/docs/0.9.0/assets/themes/zeppelin/img/docs-img/lens-interpreter-setting.png" alt="Apache Lens Interpreter Setting"></p> |
| |
| <h3>Interpreter Binding for Zeppelin Notebook</h3> |
| |
| <p>After configuring Lens interpreter, create your own notebook, then you can bind interpreters like below image.</p> |
| |
| <p><img src="/docs/0.9.0/assets/themes/zeppelin/img/docs-img/lens-interpreter-binding.png" alt="Zeppelin Notebook Interpreter Binding"></p> |
| |
| <p>For more interpreter binding information see <a href="../usage/interpreter/overview.html#interpreter-binding-mode">here</a>.</p> |
| |
| <h3>How to use</h3> |
| |
| <p>You can analyze your data by using <a href="http://lens.apache.org/user/olap-cube.html">OLAP Cube</a> <a href="http://lens.apache.org/user/cli.html">QL</a> which is a high level SQL like language to query and describe data sets organized in data cubes. |
| You may experience OLAP Cube like this <a href="https://cwiki.apache.org/confluence/display/LENS/2015/07/13/20+Minute+video+demo+of+Apache+Lens+through+examples">Video tutorial</a>. |
| As you can see in this video, they are using Lens Client Shell(<code>./bin/lens-cli.sh</code>). All of these functions also can be used on Zeppelin by using Lens interpreter.</p> |
| |
| <p><li> Create and Use (Switch) Databases.</p> |
| <div class="highlight"><pre><code class="sql language-sql" data-lang="sql"><span class="k">create</span> <span class="k">database</span> <span class="n">newDb</span> |
| </code></pre></div><div class="highlight"><pre><code class="text language-text" data-lang="text">use newDb |
| </code></pre></div> |
| <p><li> Create Storage.</p> |
| <div class="highlight"><pre><code class="text language-text" data-lang="text">create storage your/path/to/lens/client/examples/resources/db-storage.xml |
| </code></pre></div> |
| <p><li> Create Dimensions, Show fields and join-chains of them.</p> |
| <div class="highlight"><pre><code class="text language-text" data-lang="text">create dimension your/path/to/lens/client/examples/resources/customer.xml |
| </code></pre></div><div class="highlight"><pre><code class="text language-text" data-lang="text">dimension show fields customer |
| </code></pre></div><div class="highlight"><pre><code class="text language-text" data-lang="text">dimension show joinchains customer |
| </code></pre></div> |
| <p><li> Create Caches, Show fields and join-chains of them.</p> |
| <div class="highlight"><pre><code class="text language-text" data-lang="text">create cube your/path/to/lens/client/examples/resources/sales-cube.xml |
| </code></pre></div><div class="highlight"><pre><code class="text language-text" data-lang="text">cube show fields sales |
| </code></pre></div><div class="highlight"><pre><code class="text language-text" data-lang="text">cube show joinchains sales |
| </code></pre></div> |
| <p><li> Create Dimtables and Fact.</p> |
| <div class="highlight"><pre><code class="text language-text" data-lang="text">create dimtable your/path/to/lens/client/examples/resources/customer_table.xml |
| </code></pre></div><div class="highlight"><pre><code class="text language-text" data-lang="text">create fact your/path/to/lens/client/examples/resources/sales-raw-fact.xml |
| </code></pre></div> |
| <p><li> Add partitions to Dimtable and Fact.</p> |
| <div class="highlight"><pre><code class="text language-text" data-lang="text">dimtable add single-partition --dimtable_name customer_table --storage_name local |
| --path your/path/to/lens/client/examples/resources/customer-local-part.xml |
| </code></pre></div><div class="highlight"><pre><code class="text language-text" data-lang="text">fact add partitions --fact_name sales_raw_fact --storage_name local |
| --path your/path/to/lens/client/examples/resources/sales-raw-local-parts.xml |
| </code></pre></div> |
| <p><li> Now, you can run queries on cubes.</p> |
| <div class="highlight"><pre><code class="text language-text" data-lang="text">query execute cube select customer_city_name, product_details.description, |
| product_details.category, product_details.color, store_sales from sales |
| where time_range_in(delivery_time, '2015-04-11-00', '2015-04-13-00') |
| </code></pre></div> |
| <p><img src="/docs/0.9.0/assets/themes/zeppelin/img/docs-img/lens-result.png" alt="Lens Query Result"></p> |
| |
| <p>These are just examples that provided in advance by Lens. If you want to explore whole tutorials of Lens, see the <a href="https://cwiki.apache.org/confluence/display/LENS/2015/07/13/20+Minute+video+demo+of+Apache+Lens+through+examples">tutorial video</a>.</p> |
| |
| <h2>Lens UI Service</h2> |
| |
| <p>Lens also provides web UI service. Once the server starts up, you can open the service on http://serverhost:19999/index.html and browse. You may also check the structure that you made and use query easily here.</p> |
| |
| <p><img src="/docs/0.9.0/assets/themes/zeppelin/img/docs-img/lens-ui-service.png" alt="Lens UI Service"></p> |
| |
| </div> |
| </div> |
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