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Posted to commits@zeppelin.apache.org by zj...@apache.org on 2019/09/29 07:08:15 UTC
svn commit: r1867691 [20/41] - in /zeppelin/site: docs/0.8.2/
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URL: http://svn.apache.org/viewvc/zeppelin/site/docs/0.8.2/interpreter/scio.html?rev=1867691&view=auto
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+ <title>Apache Zeppelin 0.8.0 Documentation: Scio Interpreter for Apache Zeppelin</title>
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+ <li class="title"><span>Other Features</span></li>
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+ <li><a href="/docs/0.8.0/usage/rest_api/configuration.html">Configuration API</a></li>
+ <li><a href="/docs/0.8.0/usage/rest_api/credential.html">Credential API</a></li>
+ <li><a href="/docs/0.8.0/usage/rest_api/helium.html">Helium API</a></li>
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+ <li>
+ <a href="#" data-toggle="dropdown" class="dropdown-toggle">Setup<b class="caret"></b></a>
+ <ul class="dropdown-menu scrollable-menu">
+ <li class="title"><span>Basics</span></li>
+ <li><a href="/docs/0.8.0/setup/basics/how_to_build.html">How to Build Zeppelin</a></li>
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+ <li class="title"><span>Deployment</span></li>
+ <!--<li><a href="/docs/0.8.0/setup/deployment/docker.html">Docker Image for Zeppelin</a></li>-->
+ <li><a href="/docs/0.8.0/setup/deployment/spark_cluster_mode.html#spark-standalone-mode">Spark Cluster Mode: Standalone</a></li>
+ <li><a href="/docs/0.8.0/setup/deployment/spark_cluster_mode.html#spark-on-yarn-mode">Spark Cluster Mode: YARN</a></li>
+ <li><a href="/docs/0.8.0/setup/deployment/spark_cluster_mode.html#spark-on-mesos-mode">Spark Cluster Mode: Mesos</a></li>
+ <li><a href="/docs/0.8.0/setup/deployment/flink_and_spark_cluster.html">Zeppelin with Flink, Spark Cluster</a></li>
+ <li><a href="/docs/0.8.0/setup/deployment/cdh.html">Zeppelin on CDH</a></li>
+ <li><a href="/docs/0.8.0/setup/deployment/virtual_machine.html">Zeppelin on VM: Vagrant</a></li>
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+ <li class="title"><span>Security</span></li>
+ <li><a href="/docs/0.8.0/setup/security/authentication_nginx.html">HTTP Basic Auth using NGINX</a></li>
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+ <li class="title"><span>Notebook Storage</span></li>
+ <li><a href="/docs/0.8.0/setup/storage/storage.html#notebook-storage-in-local-git-repository">Git Storage</a></li>
+ <li><a href="/docs/0.8.0/setup/storage/storage.html#notebook-storage-in-s3">S3 Storage</a></li>
+ <li><a href="/docs/0.8.0/setup/storage/storage.html#notebook-storage-in-azure">Azure Storage</a></li>
+ <li><a href="/docs/0.8.0/setup/storage/storage.html#notebook-storage-in-zeppelinhub">ZeppelinHub Storage</a></li>
+ <li><a href="/docs/0.8.0/setup/storage/storage.html#notebook-storage-in-mongodb">MongoDB Storage</a></li>
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+ <li class="title"><span>Operation</span></li>
+ <li><a href="/docs/0.8.0/setup/operation/configuration.html">Configuration</a></li>
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+ <a href="#" data-toggle="dropdown" class="dropdown-toggle">Interpreter <b class="caret"></b></a>
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+ <li><a href="/docs/0.8.0/interpreter/flink.html">Flink</a></li>
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+ <li><a href="/docs/0.8.0/interpreter/lens.html">Lens</a></li>
+ <li><a href="/docs/0.8.0/interpreter/livy.html">Livy</a></li>
+ <li><a href="/docs/0.8.0/interpreter/markdown.html">Markdown</a></li>
+ <li><a href="/docs/0.8.0/interpreter/neo4j.html">Neo4j</a></li>
+ <li><a href="/docs/0.8.0/interpreter/pig.html">Pig</a></li>
+ <li><a href="/docs/0.8.0/interpreter/postgresql.html">Postgresql, HAWQ</a></li>
+ <li><a href="/docs/0.8.0/interpreter/r.html">R</a></li>
+ <li><a href="/docs/0.8.0/interpreter/scalding.html">Scalding</a></li>
+ <li><a href="/docs/0.8.0/interpreter/scio.html">Scio</a></li>
+ <li><a href="/docs/0.8.0/interpreter/shell.html">Shell</a></li>
+ </ul>
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+ <li>
+ <a href="#" data-toggle="dropdown" class="dropdown-toggle">More<b class="caret"></b></a>
+ <ul class="dropdown-menu scrollable-menu" style="right: 0; left: auto;">
+ <li class="title"><span>Extending Zeppelin</span></li>
+ <li><a href="/docs/0.8.0/development/writing_zeppelin_interpreter.html">Writing Zeppelin Interpreter</a></li>
+ <li role="separator" class="divider"></li>
+ <li class="title"><span>Helium (Experimental)</span></li>
+ <li><a href="/docs/0.8.0/development/helium/overview.html">Overview</a></li>
+ <li><a href="/docs/0.8.0/development/helium/writing_application.html">Writing Helium Application</a></li>
+ <li><a href="/docs/0.8.0/development/helium/writing_spell.html">Writing Helium Spell</a></li>
+ <li><a href="/docs/0.8.0/development/helium/writing_visualization_basic.html">Writing Helium Visualization: Basics</a></li>
+ <li><a href="/docs/0.8.0/development/helium/writing_visualization_transformation.html">Writing Helium Visualization: Transformation</a></li>
+ <li role="separator" class="divider"></li>
+ <li class="title"><span>Contributing to Zeppelin</span></li>
+ <li><a href="/docs/0.8.0/setup/basics/how_to_build.html">How to Build Zeppelin</a></li>
+ <li><a href="/docs/0.8.0/development/contribution/useful_developer_tools.html">Useful Developer Tools</a></li>
+ <li><a href="/docs/0.8.0/development/contribution/how_to_contribute_code.html">How to Contribute (code)</a></li>
+ <li><a href="/docs/0.8.0/development/contribution/how_to_contribute_website.html">How to Contribute (website)</a></li>
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+ <li class="title"><span>External Resources</span></li>
+ <li><a target="_blank" href="">Mailing List</a></li>
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+ <li><a target="_blank" href="">Stackoverflow Questions about Zeppelin</a></li>
+ </ul>
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+ <li>
+ <a href="/docs/0.8.0/search.html" class="nav-search-link">
+ <span class="fa fa-search nav-search-icon"></span>
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+ </ul>
+ </nav><!--/.navbar-collapse -->
+ </div>
+ </div>
+
+
+
+ <div class="content">
+
+<!--<div class="hero-unit Scio Interpreter for Apache Zeppelin">
+ <h1></h1>
+</div>
+-->
+
+<div class="row">
+ <div class="col-md-12">
+ <!--
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+-->
+
+<h1>Scio Interpreter for Apache Zeppelin</h1>
+
+<div id="toc"></div>
+
+<h2>Overview</h2>
+
+<p>Scio is a Scala DSL for <a href="https://github.com/GoogleCloudPlatform/DataflowJavaSDK">Google Cloud Dataflow</a> and <a href="http://beam.incubator.apache.org/">Apache Beam</a> inspired by <a href="http://spark.apache.org/">Spark</a> and <a href="https://github.com/twitter/scalding">Scalding</a>. See the current <a href="https://github.com/spotify/scio/wiki">wiki</a> and <a href="http://spotify.github.io/scio/">API documentation</a> for more information.</p>
+
+<h2>Configuration</h2>
+
+<table class="table-configuration">
+ <tr>
+ <th>Name</th>
+ <th>Default Value</th>
+ <th>Description</th>
+ </tr>
+ <tr>
+ <td>zeppelin.scio.argz</td>
+ <td>--runner=InProcessPipelineRunner</td>
+ <td>Scio interpreter wide arguments. Documentation: https://github.com/spotify/scio/wiki#options and https://cloud.google.com/dataflow/pipelines/specifying-exec-params</td>
+ </tr>
+ <tr>
+ <td>zeppelin.scio.maxResult</td>
+ <td>1000</td>
+ <td>Max number of SCollection results to display</td>
+ </tr>
+
+</table>
+
+<h2>Enabling the Scio Interpreter</h2>
+
+<p>In a notebook, to enable the <strong>Scio</strong> interpreter, click the <strong>Gear</strong> icon and select <strong>beam</strong> (<strong>beam.scio</strong>).</p>
+
+<h2>Using the Scio Interpreter</h2>
+
+<p>In a paragraph, use <code>%beam.scio</code> to select the <strong>Scio</strong> interpreter. You can use it much the same way as vanilla Scala REPL and <a href="https://github.com/spotify/scio/wiki/Scio-REPL">Scio REPL</a>. State (like variables, imports, execution etc) is shared among all <em>Scio</em> paragraphs. There is a special variable <strong>argz</strong> which holds arguments from Scio interpreter settings. The easiest way to proceed is to create a Scio context via standard <code>ContextAndArgs</code>.</p>
+<div class="highlight"><pre><code class="language-scala" data-lang="scala"><span></span><span class="o">%</span><span class="n">beam</span><span class="o">.</span><span class="n">scio</span>
+<span class="k">val</span> <span class="o">(</span><span class="n">sc</span><span class="o">,</span> <span class="n">args</span><span class="o">)</span> <span class="k">=</span> <span class="nc">ContextAndArgs</span><span class="o">(</span><span class="n">argz</span><span class="o">)</span>
+</code></pre></div>
+<p>Use <code>sc</code> context the way you would in a regular pipeline/REPL.</p>
+
+<p>Example:</p>
+<div class="highlight"><pre><code class="language-scala" data-lang="scala"><span></span><span class="o">%</span><span class="n">beam</span><span class="o">.</span><span class="n">scio</span>
+<span class="k">val</span> <span class="o">(</span><span class="n">sc</span><span class="o">,</span> <span class="n">args</span><span class="o">)</span> <span class="k">=</span> <span class="nc">ContextAndArgs</span><span class="o">(</span><span class="n">argz</span><span class="o">)</span>
+<span class="n">sc</span><span class="o">.</span><span class="n">parallelize</span><span class="o">(</span><span class="nc">Seq</span><span class="o">(</span><span class="s">"foo"</span><span class="o">,</span> <span class="s">"foo"</span><span class="o">,</span> <span class="s">"bar"</span><span class="o">)).</span><span class="n">countByValue</span><span class="o">.</span><span class="n">closeAndDisplay</span><span class="o">()</span>
+</code></pre></div>
+<p>If you close Scio context, go ahead an create a new one using <code>ContextAndArgs</code>. Please refer to <a href="https://github.com/spotify/scio/wiki">Scio wiki</a> for more complex examples. You can close Scio context much the same way as in Scio REPL, and use Zeppelin display helpers to synchronously close and display results - read more below.</p>
+
+<h3>Progress</h3>
+
+<p>There can be only one paragraph running at once. There is no notion of overall progress, thus progress bar will show <code>0</code>.</p>
+
+<h3>SCollection display helpers</h3>
+
+<p>Scio interpreter comes with display helpers to ease working with Zeppelin notebooks. Simply use <code>closeAndDisplay()</code> on <code>SCollection</code> to close context and display the results. The number of results is limited by <code>zeppelin.scio.maxResult</code> (by default 1000).</p>
+
+<p>Supported <code>SCollection</code> types:</p>
+
+<ul>
+<li>Scio's typed BigQuery</li>
+<li>Scala's Products (case classes, tuples)</li>
+<li>Google BigQuery's TableRow</li>
+<li>Apache Avro</li>
+<li>All Scala's <code>AnyVal</code></li>
+</ul>
+
+<h4>Helper methods</h4>
+
+<p>There are different helper methods for different objects. You can easily display results from <code>SCollection</code>, <code>Future[Tap]</code> and <code>Tap</code>.</p>
+
+<h5><code>SCollection</code> helper</h5>
+
+<p><code>SCollection</code> has <code>closeAndDisplay</code> Zeppelin helper method for types listed above. Use it to synchronously close Scio context, and once available pull and display results.</p>
+
+<h5><code>Future[Tap]</code> helper</h5>
+
+<p><code>Future[Tap]</code> has <code>waitAndDisplay</code> Zeppelin helper method for types listed above. Use it to synchronously wait for results, and once available pull and display results.</p>
+
+<h5><code>Tap</code> helper</h5>
+
+<p><code>Tap</code> has <code>display</code> Zeppelin helper method for types listed above. Use it to pull and display results.</p>
+
+<h3>Examples</h3>
+
+<h4>BigQuery example:</h4>
+<div class="highlight"><pre><code class="language-scala" data-lang="scala"><span></span><span class="o">%</span><span class="n">beam</span><span class="o">.</span><span class="n">scio</span>
+<span class="nd">@BigQueryType</span><span class="o">.</span><span class="n">fromQuery</span><span class="o">(</span><span class="s">"""|SELECT departure_airport,count(case when departure_delay>0 then 1 else 0 end) as no_of_delays</span>
+<span class="s"> |FROM [bigquery-samples:airline_ontime_data.flights]</span>
+<span class="s"> |group by departure_airport</span>
+<span class="s"> |order by 2 desc</span>
+<span class="s"> |limit 10"""</span><span class="o">.</span><span class="n">stripMargin</span><span class="o">)</span> <span class="k">class</span> <span class="nc">Flights</span>
+
+<span class="k">val</span> <span class="o">(</span><span class="n">sc</span><span class="o">,</span> <span class="n">args</span><span class="o">)</span> <span class="k">=</span> <span class="nc">ContextAndArgs</span><span class="o">(</span><span class="n">argz</span><span class="o">)</span>
+<span class="n">sc</span><span class="o">.</span><span class="n">bigQuerySelect</span><span class="o">(</span><span class="nc">Flights</span><span class="o">.</span><span class="n">query</span><span class="o">).</span><span class="n">closeAndDisplay</span><span class="o">(</span><span class="nc">Flights</span><span class="o">.</span><span class="n">schema</span><span class="o">)</span>
+</code></pre></div>
+<h4>BigQuery typed example:</h4>
+<div class="highlight"><pre><code class="language-scala" data-lang="scala"><span></span><span class="o">%</span><span class="n">beam</span><span class="o">.</span><span class="n">scio</span>
+<span class="nd">@BigQueryType</span><span class="o">.</span><span class="n">fromQuery</span><span class="o">(</span><span class="s">"""|SELECT departure_airport,count(case when departure_delay>0 then 1 else 0 end) as no_of_delays</span>
+<span class="s"> |FROM [bigquery-samples:airline_ontime_data.flights]</span>
+<span class="s"> |group by departure_airport</span>
+<span class="s"> |order by 2 desc</span>
+<span class="s"> |limit 10"""</span><span class="o">.</span><span class="n">stripMargin</span><span class="o">)</span> <span class="k">class</span> <span class="nc">Flights</span>
+
+<span class="k">val</span> <span class="o">(</span><span class="n">sc</span><span class="o">,</span> <span class="n">args</span><span class="o">)</span> <span class="k">=</span> <span class="nc">ContextAndArgs</span><span class="o">(</span><span class="n">argz</span><span class="o">)</span>
+<span class="n">sc</span><span class="o">.</span><span class="n">typedBigQuery</span><span class="o">[</span><span class="kt">Flights</span><span class="o">]().</span><span class="n">flatMap</span><span class="o">(</span><span class="k">_</span><span class="o">.</span><span class="n">no_of_delays</span><span class="o">).</span><span class="n">mean</span><span class="o">.</span><span class="n">closeAndDisplay</span><span class="o">()</span>
+</code></pre></div>
+<h4>Avro example:</h4>
+<div class="highlight"><pre><code class="language-scala" data-lang="scala"><span></span><span class="o">%</span><span class="n">beam</span><span class="o">.</span><span class="n">scio</span>
+<span class="k">import</span> <span class="nn">com.spotify.data.ExampleAvro</span>
+
+<span class="k">val</span> <span class="o">(</span><span class="n">sc</span><span class="o">,</span> <span class="n">args</span><span class="o">)</span> <span class="k">=</span> <span class="nc">ContextAndArgs</span><span class="o">(</span><span class="n">argz</span><span class="o">)</span>
+<span class="n">sc</span><span class="o">.</span><span class="n">avroFile</span><span class="o">[</span><span class="kt">ExampleAvro</span><span class="o">](</span><span class="s">"gs://<bucket>/tmp/my.avro"</span><span class="o">).</span><span class="n">take</span><span class="o">(</span><span class="mi">10</span><span class="o">).</span><span class="n">closeAndDisplay</span><span class="o">()</span>
+</code></pre></div>
+<h4>Avro example with a view schema:</h4>
+<div class="highlight"><pre><code class="language-scala" data-lang="scala"><span></span><span class="o">%</span><span class="n">beam</span><span class="o">.</span><span class="n">scio</span>
+<span class="k">import</span> <span class="nn">com.spotify.data.ExampleAvro</span>
+<span class="k">import</span> <span class="nn">org.apache.avro.Schema</span>
+
+<span class="k">val</span> <span class="o">(</span><span class="n">sc</span><span class="o">,</span> <span class="n">args</span><span class="o">)</span> <span class="k">=</span> <span class="nc">ContextAndArgs</span><span class="o">(</span><span class="n">argz</span><span class="o">)</span>
+<span class="k">val</span> <span class="n">view</span> <span class="k">=</span> <span class="nc">Schema</span><span class="o">.</span><span class="n">parse</span><span class="o">(</span><span class="s">"""{"type":"record","name":"ExampleAvro","namespace":"com.spotify.data","fields":[{"name":"track","type":"string"}, {"name":"artist", "type":"string"}]}"""</span><span class="o">)</span>
+
+<span class="n">sc</span><span class="o">.</span><span class="n">avroFile</span><span class="o">[</span><span class="kt">EndSongCleaned</span><span class="o">](</span><span class="s">"gs://<bucket>/tmp/my.avro"</span><span class="o">).</span><span class="n">take</span><span class="o">(</span><span class="mi">10</span><span class="o">).</span><span class="n">closeAndDisplay</span><span class="o">(</span><span class="n">view</span><span class="o">)</span>
+</code></pre></div>
+<h3>Google credentials</h3>
+
+<p>Scio Interpreter will try to infer your Google Cloud credentials from its environment, it will take into the account:</p>
+
+<ul>
+<li><code>argz</code> interpreter settings (<a href="https://github.com/spotify/scio/wiki#options">doc</a>)</li>
+<li>environment variable (<code>GOOGLE_APPLICATION_CREDENTIALS</code>)</li>
+<li>gcloud configuration</li>
+</ul>
+
+<h4>BigQuery macro credentials</h4>
+
+<p>Currently BigQuery project for macro expansion is inferred using Google Dataflow's <a href="https://github.com/GoogleCloudPlatform/DataflowJavaSDK/blob/master/sdk/src/main/java/com/google/cloud/dataflow/sdk/options/GcpOptions.java#L187">DefaultProjectFactory().create()</a></p>
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+++ zeppelin/site/docs/0.8.2/interpreter/shell.html Sun Sep 29 07:08:10 2019
@@ -0,0 +1,379 @@
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+ <div class="content">
+
+<!--<div class="hero-unit Shell interpreter for Apache Zeppelin">
+ <h1></h1>
+</div>
+-->
+
+<div class="row">
+ <div class="col-md-12">
+ <!--
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
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+http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+-->
+
+<h1>Shell interpreter for Apache Zeppelin</h1>
+
+<div id="toc"></div>
+
+<h2>Overview</h2>
+
+<p>Shell interpreter uses <a href="https://commons.apache.org/proper/commons-exec">Apache Commons Exec</a> to execute external processes.
+In Zeppelin notebook, you can use <code>%sh</code> in the beginning of a paragraph to invoke system shell and run commands.</p>
+
+<blockquote>
+<p><strong>Note :</strong> Currently each command runs as the user Zeppelin server is running as.</p>
+</blockquote>
+
+<h2>Configuration</h2>
+
+<p>At the "Interpreters" menu in Zeppelin dropdown menu, you can set the property value for Shell interpreter.</p>
+
+<table class="table-configuration">
+ <tr>
+ <th>Name</th>
+ <th>Default</th>
+ <th>Description</th>
+ </tr>
+ <tr>
+ <td>shell.command.timeout.millisecs</td>
+ <td>60000</td>
+ <td>Shell command time out in millisecs</td>
+ </tr>
+ <tr>
+ <td>shell.working.directory.user.home</td>
+ <td>false</td>
+ <td>If this set to true, the shell's working directory will be set to user home</td>
+ </tr>
+ <tr>
+ <td>zeppelin.shell.auth.type</td>
+ <td></td>
+ <td>Types of authentications' methods supported are SIMPLE, and KERBEROS</td>
+ </tr>
+ <tr>
+ <td>zeppelin.shell.principal</td>
+ <td></td>
+ <td>The principal name to load from the keytab</td>
+ </tr>
+ <tr>
+ <td>zeppelin.shell.keytab.location</td>
+ <td></td>
+ <td>The path to the keytab file</td>
+ </tr>
+ <tr>
+ <td>zeppelin.shell.interpolation</td>
+ <td>false</td>
+ <td>Enable ZeppelinContext variable interpolation into paragraph text</td>
+ </tr>
+</table>
+
+<h2>Example</h2>
+
+<p>The following example demonstrates the basic usage of Shell in a Zeppelin notebook.</p>
+
+<p><img src="/docs/0.8.0/assets/themes/zeppelin/img/docs-img/shell-example.png" /></p>
+
+<p>If you need further information about <strong>Zeppelin Interpreter Setting</strong> for using Shell interpreter,
+please read <a href="../usage/interpreter/overview.html#what-is-interpreter-setting">What is interpreter setting?</a> section first.</p>
+
+<h2>Kerberos refresh interval</h2>
+
+<p>For changing the default behavior of when to renew Kerberos ticket following changes can be made in <code>conf/zeppelin-env.sh</code>.</p>
+<div class="highlight"><pre><code class="language-bash" data-lang="bash"><span></span><span class="c1"># Change Kerberos refresh interval (default value is 1d). Allowed postfix are ms, s, m, min, h, and d.</span>
+<span class="nb">export</span> <span class="nv">LAUNCH_KERBEROS_REFRESH_INTERVAL</span><span class="o">=</span>4h
+<span class="c1"># Change kinit number retries (default value is 5), which means if the kinit command fails for 5 retries consecutively it will close the interpreter. </span>
+<span class="nb">export</span> <span class="nv">KINIT_FAIL_THRESHOLD</span><span class="o">=</span><span class="m">10</span>
+</code></pre></div>
+<h2>Object Interpolation</h2>
+
+<p>The shell interpreter also supports interpolation of <code>ZeppelinContext</code> objects into the paragraph text.
+The following example shows one use of this facility:</p>
+
+<h4>In Scala cell:</h4>
+<div class="highlight"><pre><code class="language-scala" data-lang="scala"><span></span><span class="n">z</span><span class="o">.</span><span class="n">put</span><span class="o">(</span><span class="s">"dataFileName"</span><span class="o">,</span> <span class="s">"members-list-003.parquet"</span><span class="o">)</span>
+ <span class="c1">// ...</span>
+<span class="k">val</span> <span class="n">members</span> <span class="k">=</span> <span class="n">spark</span><span class="o">.</span><span class="n">read</span><span class="o">.</span><span class="n">parquet</span><span class="o">(</span><span class="n">z</span><span class="o">.</span><span class="n">get</span><span class="o">(</span><span class="s">"dataFileName"</span><span class="o">))</span>
+ <span class="c1">// ...</span>
+</code></pre></div>
+<h4>In later Shell cell:</h4>
+<div class="highlight"><pre><code class="language-bash" data-lang="bash"><span></span>%sh
+rm -rf <span class="o">{</span>dataFileName<span class="o">}</span>
+</code></pre></div>
+<p>Object interpolation is disabled by default, and can be enabled (for the Shell interpreter) by
+setting the value of the property <code>zeppelin.shell.interpolation</code> to <code>true</code> (see <em>Configuration</em> above).
+More details of this feature can be found in <a href="../usage/other_features/zeppelin_context.html">Zeppelin-Context</a></p>
+
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