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+
+<!DOCTYPE html>
+<html lang="en">
+  <head>
+    <meta charset="utf-8">
+    <title>Apache Zeppelin 0.9.0 Documentation: Interpreter Binding 
Mode</title>
+    <meta name="description" content="">
+    <meta name="author" content="The Apache Software Foundation">
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+        <div id="menu" class="navbar navbar-inverse navbar-fixed-top" 
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+          <div class="navbar-brand">
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+              <img 
src="/docs/0.9.0/assets/themes/zeppelin/img/zeppelin_logo.png" width="50"
+                   style="margin-top: -2px;" alt="I'm zeppelin">
+              <span style="margin-left: 5px; font-size: 27px;">Zeppelin</span>
+              <a class="navbar-brand-version" href="/docs/0.9.0"
+                 style="font-size: 15px; color: white;"> 0.9.0
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+            </a>
+          </div>
+        </div>
+        <nav class="navbar-collapse collapse" role="navigation">
+          <ul class="nav navbar-nav">
+            <li>
+              <a href="#" data-toggle="dropdown" class="dropdown-toggle">Quick 
Start <b class="caret"></b></a>
+              <ul class="dropdown-menu">
+                <li class="title"><span>Getting Started</span></li>
+                <li><a 
href="/docs/0.9.0/quickstart/install.html">Install</a></li>
+                <li><a href="/docs/0.9.0/quickstart/explore_ui.html">Explore 
UI</a></li>
+                <li><a 
href="/docs/0.9.0/quickstart/tutorial.html">Tutorial</a></li>
+                <li role="separator" class="divider"></li>
+                <li class="title"><span>Run Mode</span></li>
+                <li><a 
href="/docs/0.9.0/quickstart/kubernetes.html">Kubernetes</a></li>
+                <li><a 
href="/docs/0.9.0/quickstart/docker.html">Docker</a></li>
+                <li><a href="/docs/0.9.0/quickstart/yarn.html">Yarn</a></li>
+                <li role="separator" class="divider"></li>
+                <li><a 
href="/docs/0.9.0/quickstart/spark_with_zeppelin.html">Spark with 
Zeppelin</a></li>
+                <li><a 
href="/docs/0.9.0/quickstart/sql_with_zeppelin.html">SQL with Zeppelin</a></li>
+                <li><a 
href="/docs/0.9.0/quickstart/python_with_zeppelin.html">Python with 
Zeppelin</a></li>
+              </ul>
+            </li>
+
+            <li>
+              <a href="#" data-toggle="dropdown" 
class="dropdown-toggle">Usage<b class="caret"></b></a>
+              <ul class="dropdown-menu scrollable-menu">
+                <li class="title"><span>Dynamic Form</span></li>
+                <li><a href="/docs/0.9.0/usage/dynamic_form/intro.html">What 
is Dynamic Form?</a></li>
+                <li role="separator" class="divider"></li>
+                <li class="title"><span>Display System</span></li>
+                <li><a 
href="/docs/0.9.0/usage/display_system/basic.html#text">Text Display</a></li>
+                <li><a 
href="/docs/0.9.0/usage/display_system/basic.html#html">HTML Display</a></li>
+                <li><a 
href="/docs/0.9.0/usage/display_system/basic.html#table">Table Display</a></li>
+                <li><a 
href="/docs/0.9.0/usage/display_system/basic.html#network">Network 
Display</a></li>
+                <li><a 
href="/docs/0.9.0/usage/display_system/angular_backend.html">Angular Display 
using Backend API</a></li>
+                <li><a 
href="/docs/0.9.0/usage/display_system/angular_frontend.html">Angular Display 
using Frontend API</a></li>
+                <li role="separator" class="divider"></li>
+                <li class="title"><span>Interpreter</span></li>
+                <li><a 
href="/docs/0.9.0/usage/interpreter/overview.html">Overview</a></li>
+                <li><a 
href="/docs/0.9.0/usage/interpreter/interpreter_binding_mode.html">Interpreter 
Binding Mode</a></li>
+                <li><a 
href="/docs/0.9.0/usage/interpreter/user_impersonation.html">User 
Impersonation</a></li>
+                <li><a 
href="/docs/0.9.0/usage/interpreter/dependency_management.html">Dependency 
Management</a></li>
+                <li><a 
href="/docs/0.9.0/usage/interpreter/installation.html">Installing 
Interpreters</a></li>
+                <!--<li><a 
href="/docs/0.9.0/usage/interpreter/dynamic_loading.html">Dynamic Interpreter 
Loading (Experimental)</a></li>-->
+                <li><a 
href="/docs/0.9.0/usage/interpreter/execution_hooks.html">Execution Hooks 
(Experimental)</a></li>
+                <li role="separator" class="divider"></li>
+                <li class="title"><span>Other Features</span></li>
+                <li><a 
href="/docs/0.9.0/usage/other_features/publishing_paragraphs.html">Publishing 
Paragraphs</a></li>
+                <li><a 
href="/docs/0.9.0/usage/other_features/personalized_mode.html">Personalized 
Mode</a></li>
+                <li><a 
href="/docs/0.9.0/usage/other_features/customizing_homepage.html">Customizing 
Zeppelin Homepage</a></li>
+                <li><a 
href="/docs/0.9.0/usage/other_features/notebook_actions.html">Notebook 
Actions</a></li>
+                <li><a 
href="/docs/0.9.0/usage/other_features/cron_scheduler.html">Cron 
Scheduler</a></li>
+                <li><a 
href="/docs/0.9.0/usage/other_features/zeppelin_context.html">Zeppelin 
Context</a></li>
+                <li role="separator" class="divider"></li>
+                <li class="title"><span>REST API</span></li>
+                <li><a 
href="/docs/0.9.0/usage/rest_api/interpreter.html">Interpreter API</a></li>
+                <li><a 
href="/docs/0.9.0/usage/rest_api/zeppelin_server.html">Zeppelin Server 
API</a></li>
+                <li><a 
href="/docs/0.9.0/usage/rest_api/notebook.html">Notebook API</a></li>
+                <li><a 
href="/docs/0.9.0/usage/rest_api/notebook_repository.html">Notebook Repository 
API</a></li>
+                <li><a 
href="/docs/0.9.0/usage/rest_api/configuration.html">Configuration API</a></li>
+                <li><a 
href="/docs/0.9.0/usage/rest_api/credential.html">Credential API</a></li>
+                <li><a href="/docs/0.9.0/usage/rest_api/helium.html">Helium 
API</a></li>
+              </ul>
+            </li>
+
+            <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/0.9.0/setup/basics/how_to_build.html">How 
to Build Zeppelin</a></li>
+                <li><a 
href="/docs/0.9.0/setup/basics/hadoop_integration.html">Hadoop 
Integration</a></li>
+                <li><a 
href="/docs/0.9.0/setup/basics/multi_user_support.html">Multi-user 
Support</a></li>
+                <li role="separator" class="divider"></li>
+                <li class="title"><span>Deployment</span></li>
+                <!--<li><a 
href="/docs/0.9.0/setup/deployment/docker.html">Docker Image for 
Zeppelin</a></li>-->
+                <li><a 
href="/docs/0.9.0/setup/deployment/spark_cluster_mode.html#spark-standalone-mode">Spark
 Cluster Mode: Standalone</a></li>
+                <li><a 
href="/docs/0.9.0/setup/deployment/spark_cluster_mode.html#spark-on-yarn-mode">Spark
 Cluster Mode: YARN</a></li>
+                <li><a 
href="/docs/0.9.0/setup/deployment/spark_cluster_mode.html#spark-on-mesos-mode">Spark
 Cluster Mode: Mesos</a></li>
+                <li><a 
href="/docs/0.9.0/setup/deployment/flink_and_spark_cluster.html">Zeppelin with 
Flink, Spark Cluster</a></li>
+                <li><a href="/docs/0.9.0/setup/deployment/cdh.html">Zeppelin 
on CDH</a></li>
+                <li><a 
href="/docs/0.9.0/setup/deployment/virtual_machine.html">Zeppelin on VM: 
Vagrant</a></li>
+                <li role="separator" class="divider"></li>
+                <li class="title"><span>Security</span></li>
+                <li><a 
href="/docs/0.9.0/setup/security/authentication_nginx.html">HTTP Basic Auth 
using NGINX</a></li>
+                <li><a 
href="/docs/0.9.0/setup/security/shiro_authentication.html">Shiro 
Authentication</a></li>
+                <li><a 
href="/docs/0.9.0/setup/security/notebook_authorization.html">Notebook 
Authorization</a></li>
+                <li><a 
href="/docs/0.9.0/setup/security/datasource_authorization.html">Data Source 
Authorization</a></li>
+                <li><a 
href="/docs/0.9.0/setup/security/http_security_headers.html">HTTP Security 
Headers</a></li>
+                <li role="separator" class="divider"></li>
+                <li class="title"><span>Notebook Storage</span></li>
+                <li><a 
href="/docs/0.9.0/setup/storage/storage.html#notebook-storage-in-local-git-repository">Git
 Storage</a></li>
+                <li><a 
href="/docs/0.9.0/setup/storage/storage.html#notebook-storage-in-s3">S3 
Storage</a></li>
+                <li><a 
href="/docs/0.9.0/setup/storage/storage.html#notebook-storage-in-azure">Azure 
Storage</a></li>
+                <li><a 
href="/docs/0.9.0/setup/storage/storage.html#notebook-storage-in-oss">OSS 
Storage</a></li>
+                <li><a 
href="/docs/0.9.0/setup/storage/storage.html#notebook-storage-in-zeppelinhub">ZeppelinHub
 Storage</a></li>
+                <li><a 
href="/docs/0.9.0/setup/storage/storage.html#notebook-storage-in-mongodb">MongoDB
 Storage</a></li>
+                <li role="separator" class="divider"></li>
+                <li class="title"><span>Operation</span></li>
+                <li><a 
href="/docs/0.9.0/setup/operation/configuration.html">Configuration</a></li>
+                <li><a 
href="/docs/0.9.0/setup/operation/proxy_setting.html">Proxy Setting</a></li>
+                <li><a 
href="/docs/0.9.0/setup/operation/upgrading.html">Upgrading</a></li>
+                <li><a 
href="/docs/0.9.0/setup/operation/trouble_shooting.html">Trouble 
Shooting</a></li>
+              </ul>
+            </li>
+
+            <li>
+              <a href="#" data-toggle="dropdown" 
class="dropdown-toggle">Interpreter <b class="caret"></b></a>
+              <ul class="dropdown-menu scrollable-menu">
+                <li class="title"><span>Interpreters</span></li>
+                <li><a 
href="/docs/0.9.0/usage/interpreter/overview.html">Overview</a></li>
+                <li role="separator" class="divider"></li>
+                <li><a href="/docs/0.9.0/interpreter/spark.html">Spark</a></li>
+                <li><a href="/docs/0.9.0/interpreter/jdbc.html">JDBC</a></li>
+                <li><a 
href="/docs/0.9.0/interpreter/python.html">Python</a></li>
+                <li><a href="/docs/0.9.0/interpreter/r.html">R</a></li>
+                <li role="separator" class="divider"></li>
+                <li><a 
href="/docs/0.9.0/interpreter/alluxio.html">Alluxio</a></li>
+                <li><a href="/docs/0.9.0/interpreter/beam.html">Beam</a></li>
+                <li><a 
href="/docs/0.9.0/interpreter/bigquery.html">BigQuery</a></li>
+                <li><a 
href="/docs/0.9.0/interpreter/cassandra.html">Cassandra</a></li>
+                <li><a 
href="/docs/0.9.0/interpreter/elasticsearch.html">Elasticsearch</a></li>
+                <li><a href="/docs/0.9.0/interpreter/flink.html">Flink</a></li>
+                <li><a href="/docs/0.9.0/interpreter/geode.html">Geode</a></li>
+                <li><a 
href="/docs/0.9.0/interpreter/groovy.html">Groovy</a></li>
+                <li><a 
href="/docs/0.9.0/interpreter/hazelcastjet.html">Hazelcast Jet</a></li>
+                <li><a href="/docs/0.9.0/interpreter/hbase.html">HBase</a></li>
+                <li><a href="/docs/0.9.0/interpreter/hdfs.html">HDFS</a></li>
+                <li><a href="/docs/0.9.0/interpreter/hive.html">Hive</a></li>
+                <li><a 
href="/docs/0.9.0/interpreter/ignite.html">Ignite</a></li>
+                <li><a href="/docs/0.9.0/interpreter/java.html">Java</a></li>
+                <li><a 
href="/docs/0.9.0/interpreter/jupyter.html">Jupyter</a></li>
+                <li><a 
href="/docs/0.9.0/interpreter/kotlin.html">Kotlin</a></li>
+                <li><a href="/docs/0.9.0/interpreter/kylin.html">Kylin</a></li>
+                <li><a href="/docs/0.9.0/interpreter/lens.html">Lens</a></li>
+                <li><a href="/docs/0.9.0/interpreter/livy.html">Livy</a></li>
+                <li><a 
href="/docs/0.9.0/interpreter/markdown.html">Markdown</a></li>
+                <li><a 
href="/docs/0.9.0/interpreter/mongodb.html">MongoDB</a></li>
+                <li><a href="/docs/0.9.0/interpreter/neo4j.html">Neo4j</a></li>
+                <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/scalding.html">Scalding</a></li>
+                <li><a href="/docs/0.9.0/interpreter/scio.html">Scio</a></li>
+                <li><a href="/docs/0.9.0/interpreter/shell.html">Shell</a></li>
+                <li><a 
href="/docs/0.9.0/interpreter/sparql.html">Sparql</a></li>
+                <li><a 
href="/docs/0.9.0/interpreter/submarine.html">Submarine</a></li>
+              </ul>
+            </li>
+            <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/0.9.0/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/0.9.0/development/helium/overview.html">Overview</a></li>
+                <li><a 
href="/docs/0.9.0/development/helium/writing_application.html">Writing Helium 
Application</a></li>
+                <li><a 
href="/docs/0.9.0/development/helium/writing_spell.html">Writing Helium 
Spell</a></li>
+                <li><a 
href="/docs/0.9.0/development/helium/writing_visualization_basic.html">Writing 
Helium Visualization: Basics</a></li>
+                <li><a 
href="/docs/0.9.0/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/0.9.0/setup/basics/how_to_build.html">How 
to Build Zeppelin</a></li>
+                <li><a 
href="/docs/0.9.0/development/contribution/useful_developer_tools.html">Useful 
Developer Tools</a></li>
+                <li><a 
href="/docs/0.9.0/development/contribution/how_to_contribute_code.html">How to 
Contribute (code)</a></li>
+                <li><a 
href="/docs/0.9.0/development/contribution/how_to_contribute_website.html">How 
to Contribute (website)</a></li>
+                <li role="separator" class="divider"></li>
+                <li class="title"><span>External Resources</span></li>
+                <li><a target="_blank" 
href="https://zeppelin.apache.org/community.html";>Mailing List</a></li>
+                <li><a target="_blank" 
href="https://cwiki.apache.org/confluence/display/ZEPPELIN/Zeppelin+Home";>Apache
 Zeppelin Wiki</a></li>
+                <li><a target="_blank" 
href="http://stackoverflow.com/questions/tagged/apache-zeppelin";>Stackoverflow 
Questions about Zeppelin</a></li>
+              </ul>
+            </li>
+            <li>
+              <a href="/docs/0.9.0/search.html" class="nav-search-link">
+                <span class="fa fa-search nav-search-icon"></span>
+              </a>
+            </li>
+          </ul>
+        </nav><!--/.navbar-collapse -->
+      </div>
+    </div>
+
+
+
+    <div class="content">
+      
+<!--<div class="hero-unit Interpreter Binding Mode">
+  <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>Interpreter Binding Mode</h1>
+
+<div id="toc"></div>
+
+<h2>Overview</h2>
+
+<p><center><img 
src="/docs/0.9.0/assets/themes/zeppelin/img/docs-img/interpreter_binding_per_note_user.png"
 height="70%" width="70%"></center>
+<center><img 
src="/docs/0.9.0/assets/themes/zeppelin/img/docs-img/interpreter_binding_scoped_isolated.png"
 height="70%" width="70%"></center></p>
+
+<p><br/></p>
+
+<p>Interpreter Process is a JVM process that communicates with Zeppelin daemon 
using thrift. 
+Each interpreter process has a single interpreter group, and this interpreter 
group can have one or more instances of an interpreter.
+(See <a href="../../development/writing_zeppelin_interpreter.html">here</a> to 
understand more about its internal structure.) </p>
+
+<p>Zeppelin provides 3 different modes to run interpreter process: 
<strong>shared</strong>, <strong>scoped</strong> and 
<strong>isolated</strong>.<br>
+Also, the user can specify the scope of these modes: <strong>per</strong> user 
or <strong>per note</strong>.
+These 3 modes give flexibility to fit Zeppelin into any type of use cases.</p>
+
+<p>In this documentation, we mainly discuss the <strong>per note</strong> 
scope in combination with the <strong>shared</strong>, <strong>scoped</strong> 
and <strong>isolated</strong> modes.</p>
+
+<h2>Shared Mode</h2>
+
+<div class="text-center">
+    <img 
src="/docs/0.9.0/assets/themes/zeppelin/img/docs-img/interpreter_binding_mode-shared.png"
 height="40%" width="40%">
+</div>
+
+<p><br/></p>
+
+<p>In <strong>Shared</strong> mode, single JVM process and a single session 
serves all notes. As a result, <code>note A</code> can access variables (e.g 
python, scala, ..) directly created from other notes.. </p>
+
+<h2>Scoped Mode</h2>
+
+<div class="text-center">
+    <img 
src="/docs/0.9.0/assets/themes/zeppelin/img/docs-img/interpreter_binding_mode-scoped.png">
+</div>
+
+<p><br/></p>
+
+<p>In <strong>Scoped</strong> mode, Zeppelin still runs a single interpreter 
JVM process but, in the case of per note scope, each note runs in its own 
dedicated session. 
+(Note it is still possible to share objects between these notes via <a 
href="../../interpreter/spark.html#object-exchange">ResourcePool</a>) </p>
+
+<h2>Isolated Mode</h2>
+
+<div class="text-center">
+    <img 
src="/docs/0.9.0/assets/themes/zeppelin/img/docs-img/interpreter_binding_mode-isolated.png">
+</div>
+
+<p><br/></p>
+
+<p><strong>Isolated</strong> mode runs a separate interpreter process for each 
note in the case of <strong>per note</strong> scope. 
+So, each note has an absolutely isolated session. (But it is still possible to 
share objects via <a 
href="../../interpreter/spark.html#object-exchange">ResourcePool</a>) </p>
+
+<h2>Which mode should I use?</h2>
+
+<p><br/></p>
+
+<table><thead>
+<tr>
+<th>Mode</th>
+<th>Each notebook...</th>
+<th>Benefits</th>
+<th>Disadvantages</th>
+<th>Sharing objects</th>
+</tr>
+</thead><tbody>
+<tr>
+<td><strong>shared</strong></td>
+<td>Shares a single session in a single interpreter process (JVM)</td>
+<td>Low resource utilization and it&#39;s easy to share data between 
notebooks</td>
+<td>All notebooks are affected if the interpreter process dies</td>
+<td>Can share directly</td>
+</tr>
+<tr>
+<td><strong>scoped</strong></td>
+<td>Has its own session in the same interpreter process (JVM)</td>
+<td>Less resource utilization than isolated mode</td>
+<td>All notebooks are affected if the interpreter process dies</td>
+<td>Can&#39;t share directly, but it&#39;s possible to share objects via <a 
href="../../interpreter/spark.html#object-exchange">ResourcePool</a>)</td>
+</tr>
+<tr>
+<td><strong>isolated</strong></td>
+<td>Has its own Interpreter Process</td>
+<td>One notebook is not affected directly by other notebooks (<strong>per 
note</strong>)</td>
+<td>Can&#39;t share data between notebooks easily (<strong>per 
note</strong>)</td>
+<td>Can&#39;t share directly, but it&#39;s possible to share objects via <a 
href="../../interpreter/spark.html#object-exchange">ResourcePool</a>)</td>
+</tr>
+</tbody></table>
+
+<p>In the case of the <strong>per user</strong> scope (available in a 
multi-user environment), Zeppelin manages interpreter sessions on a per user 
basis rather than a per note basis. For example:</p>
+
+<ul>
+<li>In <strong>scoped + per user</strong> mode, <code>User A</code>&#39;s 
notes <strong>might</strong> be affected by <code>User B</code>&#39;s notes. 
(e.g JVM dies, ...) Because all notes are running on the same JVM</li>
+<li>On the other hand, <strong>isolated + per user</strong> mode, <code>User 
A</code>&#39;s notes will not be affected by others&#39; notes which running on 
separated JVMs</li>
+</ul>
+
+<p><br/></p>
+
+<p>Each Interpreter implementation may have different characteristics 
depending on the back end system that they integrate. And 3 interpreter modes 
can be used differently.
+Let’s take a look how Spark Interpreter implementation uses these 3 
interpreter modes with <strong>per note</strong> scope, as an example.
+Spark Interpreter implementation includes 4 different interpreters in the 
group: Spark, SparkSQL, Pyspark and SparkR. 
+SparkInterpreter instance embeds Scala REPL for interactive Spark API 
execution.</p>
+
+<p><br/></p>
+
+<div class="text-center">
+    <img 
src="/docs/0.9.0/assets/themes/zeppelin/img/docs-img/interpreter_binding_mode-example-spark-shared.png"
 height="40%" width="40%">
+</div>
+
+<p><br/></p>
+
+<p>In Shared mode, a SparkContext and a Scala REPL is being shared among all 
interpreters in the group. 
+So every note will be sharing single SparkContext and single Scala REPL. 
+In this mode, if <code>Note A</code> defines variable ‘a’ then <code>Note 
B</code> not only able to read variable ‘a’ but also able to override the 
variable.</p>
+
+<div class="text-center">
+    <img 
src="/docs/0.9.0/assets/themes/zeppelin/img/docs-img/interpreter_binding_mode-example-spark-scoped.png">
+</div>
+
+<p><br/></p>
+
+<p>In Scoped mode, each note has its own Scala REPL. 
+So variable defined in a note can not be read or overridden in another note. 
+However, a single SparkContext still serves all the sessions.
+And all the jobs are submitted to this SparkContext and the fair scheduler 
schedules the jobs.
+This could be useful when user does not want to share Scala session, but want 
to keep single Spark application and leverage its fair scheduler.</p>
+
+<p>In Isolated mode, each note has its own SparkContext and Scala REPL.</p>
+
+<div class="text-center">
+    <img 
src="/docs/0.9.0/assets/themes/zeppelin/img/docs-img/interpreter_binding_mode-example-spark-isolated.png">
+</div>
+
+<p><br/></p>
+
+  </div>
+</div>
+
+
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+      <footer>
+        <!-- <p>&copy; 2020 The Apache Software Foundation</p>-->
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+

Added: zeppelin/site/docs/0.9.0/usage/interpreter/overview.html
URL: 
http://svn.apache.org/viewvc/zeppelin/site/docs/0.9.0/usage/interpreter/overview.html?rev=1884775&view=auto
==============================================================================
--- zeppelin/site/docs/0.9.0/usage/interpreter/overview.html (added)
+++ zeppelin/site/docs/0.9.0/usage/interpreter/overview.html Thu Dec 24 
14:36:01 2020
@@ -0,0 +1,450 @@
+
+<!DOCTYPE html>
+<html lang="en">
+  <head>
+    <meta charset="utf-8">
+    <title>Apache Zeppelin 0.9.0 Documentation: Interpreter in Apache 
Zeppelin</title>
+    <meta name="description" content="This document explains the role of 
interpreters, interpreter groups and interpreter settings in Apache Zeppelin. 
The concept of Zeppelin interpreters allows any language or data-processing 
backend to be plugged into Zeppelin.">
+    <meta name="author" content="The Apache Software Foundation">
+
+    <!-- Enable responsive viewport -->
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
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+    <![endif]-->
+
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href="//maxcdn.bootstrapcdn.com/font-awesome/4.2.0/css/font-awesome.min.css" 
rel="stylesheet">
+
+    <!-- Le styles -->
+    <link 
href="/docs/0.9.0/assets/themes/zeppelin/bootstrap/css/bootstrap.css" 
rel="stylesheet">
+    <link href="/docs/0.9.0/assets/themes/zeppelin/css/style.css?body=1" 
rel="stylesheet" type="text/css">
+    <link href="/docs/0.9.0/assets/themes/zeppelin/css/syntax.css" 
rel="stylesheet"  type="text/css" media="screen" /> 
+    <!-- Le fav and touch icons -->
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+
+    <!-- Js -->
+    <script src="https://code.jquery.com/jquery-1.10.2.min.js";></script>
+    <script 
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+    <script src="/docs/0.9.0/assets/themes/zeppelin/js/search.js"></script>    
+
+    <!-- atom & rss feed -->
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rel="alternate" title="Sitewide ATOM Feed">
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rel="alternate" title="Sitewide RSS Feed">
+  </head>
+
+  <body>
+    
+        <div id="menu" class="navbar navbar-inverse navbar-fixed-top" 
role="navigation">
+      <div class="container navbar-container">
+        <div class="navbar-header">
+          <button type="button" class="navbar-toggle" data-toggle="collapse" 
data-target=".navbar-collapse">
+            <span class="sr-only">Toggle navigation</span>
+            <span class="icon-bar"></span>
+            <span class="icon-bar"></span>
+            <span class="icon-bar"></span>
+          </button>
+          <div class="navbar-brand">
+            <a class="navbar-brand-main" href="http://zeppelin.apache.org";>
+              <img 
src="/docs/0.9.0/assets/themes/zeppelin/img/zeppelin_logo.png" width="50"
+                   style="margin-top: -2px;" alt="I'm zeppelin">
+              <span style="margin-left: 5px; font-size: 27px;">Zeppelin</span>
+              <a class="navbar-brand-version" href="/docs/0.9.0"
+                 style="font-size: 15px; color: white;"> 0.9.0
+              </a>
+            </a>
+          </div>
+        </div>
+        <nav class="navbar-collapse collapse" role="navigation">
+          <ul class="nav navbar-nav">
+            <li>
+              <a href="#" data-toggle="dropdown" class="dropdown-toggle">Quick 
Start <b class="caret"></b></a>
+              <ul class="dropdown-menu">
+                <li class="title"><span>Getting Started</span></li>
+                <li><a 
href="/docs/0.9.0/quickstart/install.html">Install</a></li>
+                <li><a href="/docs/0.9.0/quickstart/explore_ui.html">Explore 
UI</a></li>
+                <li><a 
href="/docs/0.9.0/quickstart/tutorial.html">Tutorial</a></li>
+                <li role="separator" class="divider"></li>
+                <li class="title"><span>Run Mode</span></li>
+                <li><a 
href="/docs/0.9.0/quickstart/kubernetes.html">Kubernetes</a></li>
+                <li><a 
href="/docs/0.9.0/quickstart/docker.html">Docker</a></li>
+                <li><a href="/docs/0.9.0/quickstart/yarn.html">Yarn</a></li>
+                <li role="separator" class="divider"></li>
+                <li><a 
href="/docs/0.9.0/quickstart/spark_with_zeppelin.html">Spark with 
Zeppelin</a></li>
+                <li><a 
href="/docs/0.9.0/quickstart/sql_with_zeppelin.html">SQL with Zeppelin</a></li>
+                <li><a 
href="/docs/0.9.0/quickstart/python_with_zeppelin.html">Python with 
Zeppelin</a></li>
+              </ul>
+            </li>
+
+            <li>
+              <a href="#" data-toggle="dropdown" 
class="dropdown-toggle">Usage<b class="caret"></b></a>
+              <ul class="dropdown-menu scrollable-menu">
+                <li class="title"><span>Dynamic Form</span></li>
+                <li><a href="/docs/0.9.0/usage/dynamic_form/intro.html">What 
is Dynamic Form?</a></li>
+                <li role="separator" class="divider"></li>
+                <li class="title"><span>Display System</span></li>
+                <li><a 
href="/docs/0.9.0/usage/display_system/basic.html#text">Text Display</a></li>
+                <li><a 
href="/docs/0.9.0/usage/display_system/basic.html#html">HTML Display</a></li>
+                <li><a 
href="/docs/0.9.0/usage/display_system/basic.html#table">Table Display</a></li>
+                <li><a 
href="/docs/0.9.0/usage/display_system/basic.html#network">Network 
Display</a></li>
+                <li><a 
href="/docs/0.9.0/usage/display_system/angular_backend.html">Angular Display 
using Backend API</a></li>
+                <li><a 
href="/docs/0.9.0/usage/display_system/angular_frontend.html">Angular Display 
using Frontend API</a></li>
+                <li role="separator" class="divider"></li>
+                <li class="title"><span>Interpreter</span></li>
+                <li><a 
href="/docs/0.9.0/usage/interpreter/overview.html">Overview</a></li>
+                <li><a 
href="/docs/0.9.0/usage/interpreter/interpreter_binding_mode.html">Interpreter 
Binding Mode</a></li>
+                <li><a 
href="/docs/0.9.0/usage/interpreter/user_impersonation.html">User 
Impersonation</a></li>
+                <li><a 
href="/docs/0.9.0/usage/interpreter/dependency_management.html">Dependency 
Management</a></li>
+                <li><a 
href="/docs/0.9.0/usage/interpreter/installation.html">Installing 
Interpreters</a></li>
+                <!--<li><a 
href="/docs/0.9.0/usage/interpreter/dynamic_loading.html">Dynamic Interpreter 
Loading (Experimental)</a></li>-->
+                <li><a 
href="/docs/0.9.0/usage/interpreter/execution_hooks.html">Execution Hooks 
(Experimental)</a></li>
+                <li role="separator" class="divider"></li>
+                <li class="title"><span>Other Features</span></li>
+                <li><a 
href="/docs/0.9.0/usage/other_features/publishing_paragraphs.html">Publishing 
Paragraphs</a></li>
+                <li><a 
href="/docs/0.9.0/usage/other_features/personalized_mode.html">Personalized 
Mode</a></li>
+                <li><a 
href="/docs/0.9.0/usage/other_features/customizing_homepage.html">Customizing 
Zeppelin Homepage</a></li>
+                <li><a 
href="/docs/0.9.0/usage/other_features/notebook_actions.html">Notebook 
Actions</a></li>
+                <li><a 
href="/docs/0.9.0/usage/other_features/cron_scheduler.html">Cron 
Scheduler</a></li>
+                <li><a 
href="/docs/0.9.0/usage/other_features/zeppelin_context.html">Zeppelin 
Context</a></li>
+                <li role="separator" class="divider"></li>
+                <li class="title"><span>REST API</span></li>
+                <li><a 
href="/docs/0.9.0/usage/rest_api/interpreter.html">Interpreter API</a></li>
+                <li><a 
href="/docs/0.9.0/usage/rest_api/zeppelin_server.html">Zeppelin Server 
API</a></li>
+                <li><a 
href="/docs/0.9.0/usage/rest_api/notebook.html">Notebook API</a></li>
+                <li><a 
href="/docs/0.9.0/usage/rest_api/notebook_repository.html">Notebook Repository 
API</a></li>
+                <li><a 
href="/docs/0.9.0/usage/rest_api/configuration.html">Configuration API</a></li>
+                <li><a 
href="/docs/0.9.0/usage/rest_api/credential.html">Credential API</a></li>
+                <li><a href="/docs/0.9.0/usage/rest_api/helium.html">Helium 
API</a></li>
+              </ul>
+            </li>
+
+            <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/0.9.0/setup/basics/how_to_build.html">How 
to Build Zeppelin</a></li>
+                <li><a 
href="/docs/0.9.0/setup/basics/hadoop_integration.html">Hadoop 
Integration</a></li>
+                <li><a 
href="/docs/0.9.0/setup/basics/multi_user_support.html">Multi-user 
Support</a></li>
+                <li role="separator" class="divider"></li>
+                <li class="title"><span>Deployment</span></li>
+                <!--<li><a 
href="/docs/0.9.0/setup/deployment/docker.html">Docker Image for 
Zeppelin</a></li>-->
+                <li><a 
href="/docs/0.9.0/setup/deployment/spark_cluster_mode.html#spark-standalone-mode">Spark
 Cluster Mode: Standalone</a></li>
+                <li><a 
href="/docs/0.9.0/setup/deployment/spark_cluster_mode.html#spark-on-yarn-mode">Spark
 Cluster Mode: YARN</a></li>
+                <li><a 
href="/docs/0.9.0/setup/deployment/spark_cluster_mode.html#spark-on-mesos-mode">Spark
 Cluster Mode: Mesos</a></li>
+                <li><a 
href="/docs/0.9.0/setup/deployment/flink_and_spark_cluster.html">Zeppelin with 
Flink, Spark Cluster</a></li>
+                <li><a href="/docs/0.9.0/setup/deployment/cdh.html">Zeppelin 
on CDH</a></li>
+                <li><a 
href="/docs/0.9.0/setup/deployment/virtual_machine.html">Zeppelin on VM: 
Vagrant</a></li>
+                <li role="separator" class="divider"></li>
+                <li class="title"><span>Security</span></li>
+                <li><a 
href="/docs/0.9.0/setup/security/authentication_nginx.html">HTTP Basic Auth 
using NGINX</a></li>
+                <li><a 
href="/docs/0.9.0/setup/security/shiro_authentication.html">Shiro 
Authentication</a></li>
+                <li><a 
href="/docs/0.9.0/setup/security/notebook_authorization.html">Notebook 
Authorization</a></li>
+                <li><a 
href="/docs/0.9.0/setup/security/datasource_authorization.html">Data Source 
Authorization</a></li>
+                <li><a 
href="/docs/0.9.0/setup/security/http_security_headers.html">HTTP Security 
Headers</a></li>
+                <li role="separator" class="divider"></li>
+                <li class="title"><span>Notebook Storage</span></li>
+                <li><a 
href="/docs/0.9.0/setup/storage/storage.html#notebook-storage-in-local-git-repository">Git
 Storage</a></li>
+                <li><a 
href="/docs/0.9.0/setup/storage/storage.html#notebook-storage-in-s3">S3 
Storage</a></li>
+                <li><a 
href="/docs/0.9.0/setup/storage/storage.html#notebook-storage-in-azure">Azure 
Storage</a></li>
+                <li><a 
href="/docs/0.9.0/setup/storage/storage.html#notebook-storage-in-oss">OSS 
Storage</a></li>
+                <li><a 
href="/docs/0.9.0/setup/storage/storage.html#notebook-storage-in-zeppelinhub">ZeppelinHub
 Storage</a></li>
+                <li><a 
href="/docs/0.9.0/setup/storage/storage.html#notebook-storage-in-mongodb">MongoDB
 Storage</a></li>
+                <li role="separator" class="divider"></li>
+                <li class="title"><span>Operation</span></li>
+                <li><a 
href="/docs/0.9.0/setup/operation/configuration.html">Configuration</a></li>
+                <li><a 
href="/docs/0.9.0/setup/operation/proxy_setting.html">Proxy Setting</a></li>
+                <li><a 
href="/docs/0.9.0/setup/operation/upgrading.html">Upgrading</a></li>
+                <li><a 
href="/docs/0.9.0/setup/operation/trouble_shooting.html">Trouble 
Shooting</a></li>
+              </ul>
+            </li>
+
+            <li>
+              <a href="#" data-toggle="dropdown" 
class="dropdown-toggle">Interpreter <b class="caret"></b></a>
+              <ul class="dropdown-menu scrollable-menu">
+                <li class="title"><span>Interpreters</span></li>
+                <li><a 
href="/docs/0.9.0/usage/interpreter/overview.html">Overview</a></li>
+                <li role="separator" class="divider"></li>
+                <li><a href="/docs/0.9.0/interpreter/spark.html">Spark</a></li>
+                <li><a href="/docs/0.9.0/interpreter/jdbc.html">JDBC</a></li>
+                <li><a 
href="/docs/0.9.0/interpreter/python.html">Python</a></li>
+                <li><a href="/docs/0.9.0/interpreter/r.html">R</a></li>
+                <li role="separator" class="divider"></li>
+                <li><a 
href="/docs/0.9.0/interpreter/alluxio.html">Alluxio</a></li>
+                <li><a href="/docs/0.9.0/interpreter/beam.html">Beam</a></li>
+                <li><a 
href="/docs/0.9.0/interpreter/bigquery.html">BigQuery</a></li>
+                <li><a 
href="/docs/0.9.0/interpreter/cassandra.html">Cassandra</a></li>
+                <li><a 
href="/docs/0.9.0/interpreter/elasticsearch.html">Elasticsearch</a></li>
+                <li><a href="/docs/0.9.0/interpreter/flink.html">Flink</a></li>
+                <li><a href="/docs/0.9.0/interpreter/geode.html">Geode</a></li>
+                <li><a 
href="/docs/0.9.0/interpreter/groovy.html">Groovy</a></li>
+                <li><a 
href="/docs/0.9.0/interpreter/hazelcastjet.html">Hazelcast Jet</a></li>
+                <li><a href="/docs/0.9.0/interpreter/hbase.html">HBase</a></li>
+                <li><a href="/docs/0.9.0/interpreter/hdfs.html">HDFS</a></li>
+                <li><a href="/docs/0.9.0/interpreter/hive.html">Hive</a></li>
+                <li><a 
href="/docs/0.9.0/interpreter/ignite.html">Ignite</a></li>
+                <li><a href="/docs/0.9.0/interpreter/java.html">Java</a></li>
+                <li><a 
href="/docs/0.9.0/interpreter/jupyter.html">Jupyter</a></li>
+                <li><a 
href="/docs/0.9.0/interpreter/kotlin.html">Kotlin</a></li>
+                <li><a href="/docs/0.9.0/interpreter/kylin.html">Kylin</a></li>
+                <li><a href="/docs/0.9.0/interpreter/lens.html">Lens</a></li>
+                <li><a href="/docs/0.9.0/interpreter/livy.html">Livy</a></li>
+                <li><a 
href="/docs/0.9.0/interpreter/markdown.html">Markdown</a></li>
+                <li><a 
href="/docs/0.9.0/interpreter/mongodb.html">MongoDB</a></li>
+                <li><a href="/docs/0.9.0/interpreter/neo4j.html">Neo4j</a></li>
+                <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/scalding.html">Scalding</a></li>
+                <li><a href="/docs/0.9.0/interpreter/scio.html">Scio</a></li>
+                <li><a href="/docs/0.9.0/interpreter/shell.html">Shell</a></li>
+                <li><a 
href="/docs/0.9.0/interpreter/sparql.html">Sparql</a></li>
+                <li><a 
href="/docs/0.9.0/interpreter/submarine.html">Submarine</a></li>
+              </ul>
+            </li>
+            <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/0.9.0/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/0.9.0/development/helium/overview.html">Overview</a></li>
+                <li><a 
href="/docs/0.9.0/development/helium/writing_application.html">Writing Helium 
Application</a></li>
+                <li><a 
href="/docs/0.9.0/development/helium/writing_spell.html">Writing Helium 
Spell</a></li>
+                <li><a 
href="/docs/0.9.0/development/helium/writing_visualization_basic.html">Writing 
Helium Visualization: Basics</a></li>
+                <li><a 
href="/docs/0.9.0/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/0.9.0/setup/basics/how_to_build.html">How 
to Build Zeppelin</a></li>
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href="/docs/0.9.0/development/contribution/useful_developer_tools.html">Useful 
Developer Tools</a></li>
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href="/docs/0.9.0/development/contribution/how_to_contribute_code.html">How to 
Contribute (code)</a></li>
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href="/docs/0.9.0/development/contribution/how_to_contribute_website.html">How 
to Contribute (website)</a></li>
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href="https://cwiki.apache.org/confluence/display/ZEPPELIN/Zeppelin+Home";>Apache
 Zeppelin Wiki</a></li>
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href="http://stackoverflow.com/questions/tagged/apache-zeppelin";>Stackoverflow 
Questions about Zeppelin</a></li>
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+
+
+    <div class="content">
+      
+<!--<div class="hero-unit Interpreter in Apache Zeppelin">
+  <h1></h1>
+</div>
+-->
+
+<div class="row">
+  <div class="col-md-12">
+    <!--
+Licensed under the Apache License, Version 2.0 (the "License");
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+
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+
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+See the License for the specific language governing permissions and
+limitations under the License.
+-->
+
+<h1>Interpreter in Apache Zeppelin</h1>
+
+<div id="toc"></div>
+
+<h2>Overview</h2>
+
+<p>In this section, we will explain the role of interpreters, interpreter 
groups and interpreter settings in Zeppelin.
+The concept of Zeppelin interpreters allows any language or data-processing 
backend to be plugged into Zeppelin.
+Currently, Zeppelin supports many interpreters such as Scala (with Apache 
Spark), Python (with Apache Spark), Spark SQL, Hive, JDBC, Markdown, Shell and 
so on.</p>
+
+<h2>What are Zeppelin Interpreters ?</h2>
+
+<p>A Zeppelin interpreter is a plug-in which enables Zeppelin users to use a 
specific language/data-processing-backend. For example, to use Scala code in 
Zeppelin, you would use the <code>%spark</code> interpreter.</p>
+
+<p>When you click the <code>+Create</code> button on the interpreter page, the 
interpreter drop-down list box will show all the available interpreters on your 
server.</p>
+
+<p><img 
src="/docs/0.9.0/assets/themes/zeppelin/img/screenshots/interpreter_create.png" 
width="280px"></p>
+
+<p>You can create multiple interpreters for the same engine with different 
interpreter setting. e.g. You can create <code>spark2</code> for Spark 2.x and 
create <code>spark1</code> for Spark 1.x.</p>
+
+<p>For each paragraph you write in Zeppelin, you need to specify its 
interpreter first via <code>%interpreter_group.interpreter_name</code>. e.g. 
<code>%spark.pyspark</code>, <code>%spark.r</code>.</p>
+
+<p>If you specify interpreter, you can also pass local properties to it (if it 
needs them).  This is done by providing a set of key/value pairs, separated by 
comma, inside the round brackets right after the interpreter name. If key or 
value contain characters like <code>=</code>, or <code>,</code>, then you can 
either escape them with <code>\</code> character, or wrap the whole value 
inside the double quotes For example:</p>
+<div class="highlight"><pre><code class="text language-text" 
data-lang="text">%cassandra(outputFormat=cql, dateFormat=&quot;E, d MMM 
yy&quot;, timeFormat=E\, d MMM yy)
+</code></pre></div>
+<h2>What are the Interpreter Settings?</h2>
+
+<p>The interpreter settings are the configuration of a given interpreter on 
the Zeppelin server. For example, certain properties need to be set for the 
Apache Hive JDBC interpreter to connect to the Hive server.</p>
+
+<p><img 
src="/docs/0.9.0/assets/themes/zeppelin/img/screenshots/interpreter_setting.png"
 width="500px"></p>
+
+<p>Properties are exported as environment variables on the system if the 
property name consists of upper-case characters, numbers or underscores 
([A-Z_0-9]). Otherwise, the property is set as a common interpreter property. 
+e.g. You can define <code>SPARK_HOME</code> and <code>HADOOP_CONF_DIR</code> 
in spark&#39;s interpreter setting, they are be passed to Spark interpreter 
process as environment variable which is used by Spark. </p>
+
+<p>You may use parameters from the context of the interpreter by adding 
#{contextParameterName} in the interpreter property value. The parameter can be 
of the following types: string, number, boolean.</p>
+
+<h3>Context Parameters</h3>
+
+<table class="table-configuration">
+  <tr>
+    <th>Name</th>
+    <th>Type</th>
+  </tr>
+  <tr>
+    <td>user</td>
+    <td>string</td>
+  </tr>
+  <tr>
+    <td>noteId</td>
+    <td>string</td>
+  </tr>
+  <tr>
+    <td>replName</td>
+    <td>string</td>
+  </tr>
+  <tr>
+    <td>className</td>
+    <td>string</td>
+  </tr>
+</table>
+
+<p>If the context parameter is null, then it is replaced by an empty string. 
The following screenshot is one example where we make the user name as the 
property value of <code>default.user</code>.</p>
+
+<p><img 
src="/docs/0.9.0/assets/themes/zeppelin/img/screenshots/interpreter_setting_with_context_parameters.png"
 width="800px"></p>
+
+<h2>What are Interpreter Groups ?</h2>
+
+<p>Every interpreter belongs to an <strong>Interpreter Group</strong>. 
Interpreter Groups are units of interpreters that run in one single JVM process 
and can be started/stopped together.
+By default, every interpreter belongs to a separate group, but the group might 
contain more interpreters. For example, the Spark interpreter group includes 
Scala Spark, PySpark, IPySpark, SparkR and Spark SQL.</p>
+
+<p>Technically, Zeppelin interpreters from the same group run within the same 
JVM. For more information about this, please consult <a 
href="../development/writing_zeppelin_interpreter.html">the documentation on 
writing interpreters</a>.</p>
+
+<p>Each interpreter belongs to a single group and is registered together. All 
relevant properties are listed in the interpreter setting as in the below 
example.</p>
+
+<p><img 
src="/docs/0.9.0/assets/themes/zeppelin/img/screenshots/interpreter_setting_spark.png"
 width="500px"></p>
+
+<h2>Interpreter Binding Mode</h2>
+
+<p>In the Interpreter Settings, one can choose one of the <code>shared</code>, 
<code>scoped</code>, or <code>isolated</code> interpreter binding modes.
+In <code>shared</code> mode, every note/user using this interpreter will share 
a single interpreter instance. 
+<code>scoped</code> and <code>isolated</code> mode can be used under 2 
dimensions: <code>per user</code> or <code>per note</code>.
+e.g. In <code>scoped per note</code> mode, each note will create a new 
interpreter instance in the same interpreter process. In <code>isolated per 
note</code> mode, each note will create a new interpreter process.</p>
+
+<p>For more information, please consult <a 
href="./interpreter_binding_mode.html">Interpreter Binding Mode</a>.</p>
+
+<p><img 
src="/docs/0.9.0/assets/themes/zeppelin/img/screenshots/interpreter_persession.png"
 width="400px"></p>
+
+<h2>Interpreter Lifecycle Management</h2>
+
+<p>Before 0.8.0, Zeppelin doesn&#39;t have lifecycle management for 
interpreters. Users had to shut down interpreters explicitly via the UI. 
Starting from 0.8.0, Zeppelin provides a new interface
+<code>LifecycleManager</code> to control the lifecycle of interpreters. For 
now, there are two implementations: <code>NullLifecycleManager</code> and 
<code>TimeoutLifecycleManager</code>. </p>
+
+<p><code>NullLifecycleManager</code> will do nothing, i.e., the user needs to 
control the lifecycle of interpreter by themselves as before. 
<code>TimeoutLifecycleManager</code> will shut down interpreters after an 
interpreter remains idle for a while. By default, the idle threshold is 1 hour.
+Users can change this threshold via the 
<code>zeppelin.interpreter.lifecyclemanager.timeout.threshold</code> setting. 
<code>NullLifecycleManager</code> is the default lifecycle manager, and users 
can change it via <code>zeppelin.interpreter.lifecyclemanager.class</code>.</p>
+
+<h2>Inline Generic Configuration</h2>
+
+<p>Zeppelin&#39;s interpreter setting is shared by all users and notes, if you 
want to have different settings, you have to create a new interpreter, e.g. you 
can create <code>spark_jar1</code> for running Spark with dependency 
<code>jar1</code> and <code>spark_jar2</code> for running Spark with dependency 
<code>jar2</code>.
+This approach works, but is not convenient. Inline generic configuration can 
provide more fine-grained control on interpreter settings and more flexibility. 
</p>
+
+<p><code>ConfInterpreter</code> is a generic interpreter that can be used by 
any interpreter. You can use it just like defining a java property file.
+It can be used to make custom settings for any interpreter. However, 
<code>ConfInterpreter</code> needs to run before that interpreter process is 
launched. When that interpreter process is launched is determined by the 
interpreter binding mode setting.
+So users need to understand the <a 
href="../usage/interpreter/interpreter_bindings_mode.html">interpreter binding 
mode setting</a> of Zeppelin and be aware of when the interpreter process is 
launched. E.g., if we set the Spark interpreter setting as isolated per note, 
then under this setting, each note will launch one interpreter process. 
+In this scenario, users need to put <code>ConfInterpreter</code> as the first 
paragraph as in the below example. Otherwise, the customized setting cannot be 
applied (actually it would report <code>ERROR</code>).</p>
+
+<p><img 
src="/docs/0.9.0/assets/themes/zeppelin/img/screenshots/conf_interpreter.png" 
width="600px"></p>
+
+<h2>Precode</h2>
+
+<p>Snippet of code (language of interpreter) that executes after 
initialization of the interpreter depends on <a 
href="#interpreter-binding-mode">Binding mode</a>. To configure, add a 
parameter with the class of the interpreter 
(<code>zeppelin.&lt;ClassName&gt;.precode</code>) except JDBCInterpreter (<a 
href="../../interpreter/jdbc.html#usage-precode">JDBC precode</a>). </p>
+
+<p><img 
src="/docs/0.9.0/assets/themes/zeppelin/img/screenshots/interpreter_precode.png"
 width="800px"></p>
+
+<h2>Credential Injection</h2>
+
+<p>Credentials from the credential manager can be injected into Notebooks. 
Credential injection works by replacing the following patterns in Notebooks 
with matching credentials for the Credential Manager: 
<code>{CREDENTIAL_ENTITY.user}</code> and 
<code>{CREDENTIAL_ENTITY.password}</code>. However, credential injection must 
be enabled per Interpreter, by adding a boolean <code>injectCredentials</code> 
setting in the Interpreters configuration. Injected passwords are removed from 
Notebook output to prevent accidentally leaking passwords.</p>
+
+<p><strong>Credential Injection Setting</strong>
+<img 
src="/docs/0.9.0/assets/themes/zeppelin/img/screenshots/credential_injection_setting.png"
 width="500px"></p>
+
+<p><strong>Credential Entry Example</strong>
+<img 
src="/docs/0.9.0/assets/themes/zeppelin/img/screenshots/credential_entry.png" 
width="500px"></p>
+
+<p><strong>Credential Injection Example</strong></p>
+<div class="highlight"><pre><code class="scala language-scala" 
data-lang="scala"><span class="k">val</span> <span class="n">password</span> 
<span class="k">=</span> <span 
class="s">&quot;{SOME_CREDENTIAL_ENTITY.password}&quot;</span>
+
+<span class="k">val</span> <span class="n">username</span> <span 
class="k">=</span> <span 
class="s">&quot;{SOME_CREDENTIAL_ENTITY.user}&quot;</span>
+</code></pre></div>
+<h2>Interpreter Process Recovery (Experimental)</h2>
+
+<p>Before 0.8.0, shutting down Zeppelin also meant to shutdown all the running 
interpreter processes. Usually, an administrator will shutdown the Zeppelin 
server for maintenance or upgrades, but would not want to shut down the running 
interpreter processes.
+In such cases, interpreter process recovery is necessary. Starting from 0.8.0, 
users can enable interpreter process recovery via the setting 
<code>zeppelin.recovery.storage.class</code> as 
+<code>org.apache.zeppelin.interpreter.recovery.FileSystemRecoveryStorage</code>
 or other implementations if available in the future. By default it is 
<code>org.apache.zeppelin.interpreter.recovery.NullRecoveryStorage</code>,
+ which means recovery is not enabled. <code>zeppelin.recovery.dir</code> is 
used for specify where to store the recovery metadata. 
+Enabling recovery means shutting down Zeppelin would not terminate interpreter 
processes, and when Zeppelin is restarted, it would try to reconnect to the 
existing running interpreter processes. If you want to kill all the interpreter 
processes after terminating Zeppelin even when recovery is enabled, you can run 
<code>bin/stop-interpreter.sh</code>.</p>
+
+<p>In 0.8.x, Zeppelin server would reconnect to the running interpreter 
process only when you run paragraph again, but it won&#39;t recover the running 
paragraph. E.g. if you restart zeppelin server when some paragraph is still 
running,
+then when you restart Zeppelin, although the interpreter process is still 
running, you won&#39;t see the paragraph is running in frontend. In 0.9.x, we 
fix it by recovering the running paragraphs.
+Here&#39;s one screenshot of how one running paragraph of flink interpreter 
works.</p>
+
+<p><img 
src="/docs/0.9.0/assets/themes/zeppelin/img/docs-img/flink_recovery.gif" 
width="800px"></p>
+
+<h2>Choose Interpreters</h2>
+
+<p>By default, Zeppelin will register and display all the interpreters under 
folder <code>$ZEPPELIN_HOME/interpreters</code>.
+But you can configure property <code>zeppelin.interpreter.include</code> to 
specify what interpreters you want to include or 
<code>zeppelin.interpreter.exclude</code> to specify what interpreters you want 
to exclude.
+Only one of them can be specified, you can not specify them together.</p>
+
+  </div>
+</div>
+
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Added: zeppelin/site/docs/0.9.0/usage/interpreter/user_impersonation.html
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+++ zeppelin/site/docs/0.9.0/usage/interpreter/user_impersonation.html Thu Dec 
24 14:36:01 2020
@@ -0,0 +1,350 @@
+
+<!DOCTYPE html>
+<html lang="en">
+  <head>
+    <meta charset="utf-8">
+    <title>Apache Zeppelin 0.9.0 Documentation: Impersonation</title>
+    <meta name="description" content="Set up zeppelin interpreter process as 
web front end user.">
+    <meta name="author" content="The Apache Software Foundation">
+
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+
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rel="stylesheet" type="text/css">
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+              <a href="#" data-toggle="dropdown" class="dropdown-toggle">Quick 
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+              <ul class="dropdown-menu">
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+                <li><a 
href="/docs/0.9.0/quickstart/install.html">Install</a></li>
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+                <li><a 
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+                <li><a 
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+                <li role="separator" class="divider"></li>
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href="/docs/0.9.0/quickstart/spark_with_zeppelin.html">Spark with 
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+            <li>
+              <a href="#" data-toggle="dropdown" 
class="dropdown-toggle">Usage<b class="caret"></b></a>
+              <ul class="dropdown-menu scrollable-menu">
+                <li class="title"><span>Dynamic Form</span></li>
+                <li><a href="/docs/0.9.0/usage/dynamic_form/intro.html">What 
is Dynamic Form?</a></li>
+                <li role="separator" class="divider"></li>
+                <li class="title"><span>Display System</span></li>
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href="/docs/0.9.0/usage/display_system/basic.html#text">Text Display</a></li>
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Display</a></li>
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href="/docs/0.9.0/usage/display_system/angular_backend.html">Angular Display 
using Backend API</a></li>
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href="/docs/0.9.0/usage/display_system/angular_frontend.html">Angular Display 
using Frontend API</a></li>
+                <li role="separator" class="divider"></li>
+                <li class="title"><span>Interpreter</span></li>
+                <li><a 
href="/docs/0.9.0/usage/interpreter/overview.html">Overview</a></li>
+                <li><a 
href="/docs/0.9.0/usage/interpreter/interpreter_binding_mode.html">Interpreter 
Binding Mode</a></li>
+                <li><a 
href="/docs/0.9.0/usage/interpreter/user_impersonation.html">User 
Impersonation</a></li>
+                <li><a 
href="/docs/0.9.0/usage/interpreter/dependency_management.html">Dependency 
Management</a></li>
+                <li><a 
href="/docs/0.9.0/usage/interpreter/installation.html">Installing 
Interpreters</a></li>
+                <!--<li><a 
href="/docs/0.9.0/usage/interpreter/dynamic_loading.html">Dynamic Interpreter 
Loading (Experimental)</a></li>-->
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href="/docs/0.9.0/usage/interpreter/execution_hooks.html">Execution Hooks 
(Experimental)</a></li>
+                <li role="separator" class="divider"></li>
+                <li class="title"><span>Other Features</span></li>
+                <li><a 
href="/docs/0.9.0/usage/other_features/publishing_paragraphs.html">Publishing 
Paragraphs</a></li>
+                <li><a 
href="/docs/0.9.0/usage/other_features/personalized_mode.html">Personalized 
Mode</a></li>
+                <li><a 
href="/docs/0.9.0/usage/other_features/customizing_homepage.html">Customizing 
Zeppelin Homepage</a></li>
+                <li><a 
href="/docs/0.9.0/usage/other_features/notebook_actions.html">Notebook 
Actions</a></li>
+                <li><a 
href="/docs/0.9.0/usage/other_features/cron_scheduler.html">Cron 
Scheduler</a></li>
+                <li><a 
href="/docs/0.9.0/usage/other_features/zeppelin_context.html">Zeppelin 
Context</a></li>
+                <li role="separator" class="divider"></li>
+                <li class="title"><span>REST API</span></li>
+                <li><a 
href="/docs/0.9.0/usage/rest_api/interpreter.html">Interpreter API</a></li>
+                <li><a 
href="/docs/0.9.0/usage/rest_api/zeppelin_server.html">Zeppelin Server 
API</a></li>
+                <li><a 
href="/docs/0.9.0/usage/rest_api/notebook.html">Notebook API</a></li>
+                <li><a 
href="/docs/0.9.0/usage/rest_api/notebook_repository.html">Notebook Repository 
API</a></li>
+                <li><a 
href="/docs/0.9.0/usage/rest_api/configuration.html">Configuration API</a></li>
+                <li><a 
href="/docs/0.9.0/usage/rest_api/credential.html">Credential API</a></li>
+                <li><a href="/docs/0.9.0/usage/rest_api/helium.html">Helium 
API</a></li>
+              </ul>
+            </li>
+
+            <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/0.9.0/setup/basics/how_to_build.html">How 
to Build Zeppelin</a></li>
+                <li><a 
href="/docs/0.9.0/setup/basics/hadoop_integration.html">Hadoop 
Integration</a></li>
+                <li><a 
href="/docs/0.9.0/setup/basics/multi_user_support.html">Multi-user 
Support</a></li>
+                <li role="separator" class="divider"></li>
+                <li class="title"><span>Deployment</span></li>
+                <!--<li><a 
href="/docs/0.9.0/setup/deployment/docker.html">Docker Image for 
Zeppelin</a></li>-->
+                <li><a 
href="/docs/0.9.0/setup/deployment/spark_cluster_mode.html#spark-standalone-mode">Spark
 Cluster Mode: Standalone</a></li>
+                <li><a 
href="/docs/0.9.0/setup/deployment/spark_cluster_mode.html#spark-on-yarn-mode">Spark
 Cluster Mode: YARN</a></li>
+                <li><a 
href="/docs/0.9.0/setup/deployment/spark_cluster_mode.html#spark-on-mesos-mode">Spark
 Cluster Mode: Mesos</a></li>
+                <li><a 
href="/docs/0.9.0/setup/deployment/flink_and_spark_cluster.html">Zeppelin with 
Flink, Spark Cluster</a></li>
+                <li><a href="/docs/0.9.0/setup/deployment/cdh.html">Zeppelin 
on CDH</a></li>
+                <li><a 
href="/docs/0.9.0/setup/deployment/virtual_machine.html">Zeppelin on VM: 
Vagrant</a></li>
+                <li role="separator" class="divider"></li>
+                <li class="title"><span>Security</span></li>
+                <li><a 
href="/docs/0.9.0/setup/security/authentication_nginx.html">HTTP Basic Auth 
using NGINX</a></li>
+                <li><a 
href="/docs/0.9.0/setup/security/shiro_authentication.html">Shiro 
Authentication</a></li>
+                <li><a 
href="/docs/0.9.0/setup/security/notebook_authorization.html">Notebook 
Authorization</a></li>
+                <li><a 
href="/docs/0.9.0/setup/security/datasource_authorization.html">Data Source 
Authorization</a></li>
+                <li><a 
href="/docs/0.9.0/setup/security/http_security_headers.html">HTTP Security 
Headers</a></li>
+                <li role="separator" class="divider"></li>
+                <li class="title"><span>Notebook Storage</span></li>
+                <li><a 
href="/docs/0.9.0/setup/storage/storage.html#notebook-storage-in-local-git-repository">Git
 Storage</a></li>
+                <li><a 
href="/docs/0.9.0/setup/storage/storage.html#notebook-storage-in-s3">S3 
Storage</a></li>
+                <li><a 
href="/docs/0.9.0/setup/storage/storage.html#notebook-storage-in-azure">Azure 
Storage</a></li>
+                <li><a 
href="/docs/0.9.0/setup/storage/storage.html#notebook-storage-in-oss">OSS 
Storage</a></li>
+                <li><a 
href="/docs/0.9.0/setup/storage/storage.html#notebook-storage-in-zeppelinhub">ZeppelinHub
 Storage</a></li>
+                <li><a 
href="/docs/0.9.0/setup/storage/storage.html#notebook-storage-in-mongodb">MongoDB
 Storage</a></li>
+                <li role="separator" class="divider"></li>
+                <li class="title"><span>Operation</span></li>
+                <li><a 
href="/docs/0.9.0/setup/operation/configuration.html">Configuration</a></li>
+                <li><a 
href="/docs/0.9.0/setup/operation/proxy_setting.html">Proxy Setting</a></li>
+                <li><a 
href="/docs/0.9.0/setup/operation/upgrading.html">Upgrading</a></li>
+                <li><a 
href="/docs/0.9.0/setup/operation/trouble_shooting.html">Trouble 
Shooting</a></li>
+              </ul>
+            </li>
+
+            <li>
+              <a href="#" data-toggle="dropdown" 
class="dropdown-toggle">Interpreter <b class="caret"></b></a>
+              <ul class="dropdown-menu scrollable-menu">
+                <li class="title"><span>Interpreters</span></li>
+                <li><a 
href="/docs/0.9.0/usage/interpreter/overview.html">Overview</a></li>
+                <li role="separator" class="divider"></li>
+                <li><a href="/docs/0.9.0/interpreter/spark.html">Spark</a></li>
+                <li><a href="/docs/0.9.0/interpreter/jdbc.html">JDBC</a></li>
+                <li><a 
href="/docs/0.9.0/interpreter/python.html">Python</a></li>
+                <li><a href="/docs/0.9.0/interpreter/r.html">R</a></li>
+                <li role="separator" class="divider"></li>
+                <li><a 
href="/docs/0.9.0/interpreter/alluxio.html">Alluxio</a></li>
+                <li><a href="/docs/0.9.0/interpreter/beam.html">Beam</a></li>
+                <li><a 
href="/docs/0.9.0/interpreter/bigquery.html">BigQuery</a></li>
+                <li><a 
href="/docs/0.9.0/interpreter/cassandra.html">Cassandra</a></li>
+                <li><a 
href="/docs/0.9.0/interpreter/elasticsearch.html">Elasticsearch</a></li>
+                <li><a href="/docs/0.9.0/interpreter/flink.html">Flink</a></li>
+                <li><a href="/docs/0.9.0/interpreter/geode.html">Geode</a></li>
+                <li><a 
href="/docs/0.9.0/interpreter/groovy.html">Groovy</a></li>
+                <li><a 
href="/docs/0.9.0/interpreter/hazelcastjet.html">Hazelcast Jet</a></li>
+                <li><a href="/docs/0.9.0/interpreter/hbase.html">HBase</a></li>
+                <li><a href="/docs/0.9.0/interpreter/hdfs.html">HDFS</a></li>
+                <li><a href="/docs/0.9.0/interpreter/hive.html">Hive</a></li>
+                <li><a 
href="/docs/0.9.0/interpreter/ignite.html">Ignite</a></li>
+                <li><a href="/docs/0.9.0/interpreter/java.html">Java</a></li>
+                <li><a 
href="/docs/0.9.0/interpreter/jupyter.html">Jupyter</a></li>
+                <li><a 
href="/docs/0.9.0/interpreter/kotlin.html">Kotlin</a></li>
+                <li><a href="/docs/0.9.0/interpreter/kylin.html">Kylin</a></li>
+                <li><a href="/docs/0.9.0/interpreter/lens.html">Lens</a></li>
+                <li><a href="/docs/0.9.0/interpreter/livy.html">Livy</a></li>
+                <li><a 
href="/docs/0.9.0/interpreter/markdown.html">Markdown</a></li>
+                <li><a 
href="/docs/0.9.0/interpreter/mongodb.html">MongoDB</a></li>
+                <li><a href="/docs/0.9.0/interpreter/neo4j.html">Neo4j</a></li>
+                <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/scalding.html">Scalding</a></li>
+                <li><a href="/docs/0.9.0/interpreter/scio.html">Scio</a></li>
+                <li><a href="/docs/0.9.0/interpreter/shell.html">Shell</a></li>
+                <li><a 
href="/docs/0.9.0/interpreter/sparql.html">Sparql</a></li>
+                <li><a 
href="/docs/0.9.0/interpreter/submarine.html">Submarine</a></li>
+              </ul>
+            </li>
+            <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/0.9.0/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/0.9.0/development/helium/overview.html">Overview</a></li>
+                <li><a 
href="/docs/0.9.0/development/helium/writing_application.html">Writing Helium 
Application</a></li>
+                <li><a 
href="/docs/0.9.0/development/helium/writing_spell.html">Writing Helium 
Spell</a></li>
+                <li><a 
href="/docs/0.9.0/development/helium/writing_visualization_basic.html">Writing 
Helium Visualization: Basics</a></li>
+                <li><a 
href="/docs/0.9.0/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/0.9.0/setup/basics/how_to_build.html">How 
to Build Zeppelin</a></li>
+                <li><a 
href="/docs/0.9.0/development/contribution/useful_developer_tools.html">Useful 
Developer Tools</a></li>
+                <li><a 
href="/docs/0.9.0/development/contribution/how_to_contribute_code.html">How to 
Contribute (code)</a></li>
+                <li><a 
href="/docs/0.9.0/development/contribution/how_to_contribute_website.html">How 
to Contribute (website)</a></li>
+                <li role="separator" class="divider"></li>
+                <li class="title"><span>External Resources</span></li>
+                <li><a target="_blank" 
href="https://zeppelin.apache.org/community.html";>Mailing List</a></li>
+                <li><a target="_blank" 
href="https://cwiki.apache.org/confluence/display/ZEPPELIN/Zeppelin+Home";>Apache
 Zeppelin Wiki</a></li>
+                <li><a target="_blank" 
href="http://stackoverflow.com/questions/tagged/apache-zeppelin";>Stackoverflow 
Questions about Zeppelin</a></li>
+              </ul>
+            </li>
+            <li>
+              <a href="/docs/0.9.0/search.html" class="nav-search-link">
+                <span class="fa fa-search nav-search-icon"></span>
+              </a>
+            </li>
+          </ul>
+        </nav><!--/.navbar-collapse -->
+      </div>
+    </div>
+
+
+
+    <div class="content">
+      
+<!--<div class="hero-unit Impersonation">
+  <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>Impersonation</h1>
+
+<p>User impersonation enables to run zeppelin interpreter process as a web 
frontend user</p>
+
+<h2>Setup</h2>
+
+<h4>1. Enable Shiro auth in <code>conf/shiro.ini</code></h4>
+<div class="highlight"><pre><code class="text language-text" 
data-lang="text">[users]
+user1 = password1, role1
+user2 = password2, role2
+</code></pre></div>
+<h4>2. Enable password-less ssh for the user you want to impersonate (say 
user1).</h4>
+<div class="highlight"><pre><code class="bash language-bash" 
data-lang="bash">adduser user1
+<span class="c">#ssh-keygen (optional if you don&#39;t already have generated 
ssh-key.</span>
+ssh user1@localhost mkdir -p .ssh
+cat ~/.ssh/id_rsa.pub <span class="p">|</span> ssh user1@localhost <span 
class="s1">&#39;cat &gt;&gt; .ssh/authorized_keys&#39;</span>
+</code></pre></div>
+<p>Alternatively instead of password-less, user can override 
ZEPPELIN<em>IMPERSONATE</em>CMD in zeppelin-env.sh</p>
+<div class="highlight"><pre><code class="bash language-bash" 
data-lang="bash"><span class="nb">export </span><span 
class="nv">ZEPPELIN_IMPERSONATE_CMD</span><span class="o">=</span><span 
class="s1">&#39;sudo -H -u ${ZEPPELIN_IMPERSONATE_USER} bash -c &#39;</span>
+</code></pre></div>
+<h4>4. Restart zeppelin server.</h4>
+<div class="highlight"><pre><code class="bash language-bash" 
data-lang="bash"><span class="c"># for OSX, linux</span>
+bin/zeppelin-daemon restart
+
+<span class="c"># for windows</span>
+bin<span class="se">\z</span>eppelin.cmd
+</code></pre></div>
+<h4>5. Configure impersonation for interpreter</h4>
+
+<div class="row">
+  <div class="col-md-12" >
+      <a data-lightbox="compiler" 
href="/docs/0.9.0/assets/themes/zeppelin/img/screenshots/user-impersonation.gif">
+        <img class="img-responsive" 
src="/docs/0.9.0/assets/themes/zeppelin/img/screenshots/user-impersonation.gif" 
/>
+      </a>
+
+  </div>
+</div>
+
+<p><br/></p>
+
+<p>Go to interpreter setting page, and enable &quot;User Impersonate&quot; in 
any of the interpreter (in my example its shell interpreter)</p>
+
+<h4>6. Test with a simple paragraph</h4>
+<div class="highlight"><pre><code class="bash language-bash" 
data-lang="bash">%sh
+whoami
+</code></pre></div>
+<p>Note that usage of &quot;User Impersonate&quot; option will enable Spark 
interpreter to use <code>--proxy-user</code> option with current user by 
default. If you want to disable <code>--proxy-user</code> option, then refer to 
<code>ZEPPELIN_IMPERSONATE_SPARK_PROXY_USER</code> variable in 
<code>conf/zeppelin-env.sh</code></p>
+
+  </div>
+</div>
+
+
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