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| |
| <h1>Livy Interpreter for Apache Zeppelin</h1> |
| |
| <div id="toc"></div> |
| |
| <h2>Overview</h2> |
| |
| <p><a href="http://livy.io/">Livy</a> is an open source REST interface for interacting with Spark from anywhere. It supports executing snippets of code or programs in a Spark context that runs locally or in YARN.</p> |
| |
| <ul> |
| <li>Interactive Scala, Python and R shells</li> |
| <li>Batch submissions in Scala, Java, Python</li> |
| <li>Multi users can share the same server (impersonation support)</li> |
| <li>Can be used for submitting jobs from anywhere with REST</li> |
| <li>Does not require any code change to your programs</li> |
| </ul> |
| |
| <h3>Requirements</h3> |
| |
| <p>Additional requirements for the Livy interpreter are:</p> |
| |
| <ul> |
| <li>Spark 1.3 or above.</li> |
| <li>Livy server.</li> |
| </ul> |
| |
| <h2>Configuration</h2> |
| |
| <p>We added some common configurations for spark, and you can set any configuration you want. |
| You can find all Spark configurations in <a href="http://spark.apache.org/docs/latest/configuration.html#available-properties">here</a>. |
| And instead of starting property with <code>spark.</code> it should be replaced with <code>livy.spark.</code>. |
| Example: <code>spark.driver.memory</code> to <code>livy.spark.driver.memory</code></p> |
| |
| <table class="table-configuration"> |
| <tr> |
| <th>Property</th> |
| <th>Default</th> |
| <th>Description</th> |
| </tr> |
| <tr> |
| <td>zeppelin.livy.url</td> |
| <td>http://localhost:8998</td> |
| <td>URL where livy server is running</td> |
| </tr> |
| <tr> |
| <td>zeppelin.livy.spark.sql.maxResult</td> |
| <td>1000</td> |
| <td>Max number of Spark SQL result to display.</td> |
| </tr> |
| <tr> |
| <td>zeppelin.livy.spark.sql.field.truncate</td> |
| <td>true</td> |
| <td>Whether to truncate field values longer than 20 characters or not</td> |
| </tr> |
| <tr> |
| <td>zeppelin.livy.session.create_timeout</td> |
| <td>120</td> |
| <td>Timeout in seconds for session creation</td> |
| </tr> |
| <tr> |
| <td>zeppelin.livy.displayAppInfo</td> |
| <td>true</td> |
| <td>Whether to display app info</td> |
| </tr> |
| <tr> |
| <td>zeppelin.livy.pull_status.interval.millis</td> |
| <td>1000</td> |
| <td>The interval for checking paragraph execution status</td> |
| </tr> |
| <tr> |
| <td>livy.spark.driver.cores</td> |
| <td></td> |
| <td>Driver cores. ex) 1, 2.</td> |
| </tr> |
| <tr> |
| <td>livy.spark.driver.memory</td> |
| <td></td> |
| <td>Driver memory. ex) 512m, 32g.</td> |
| </tr> |
| <tr> |
| <td>livy.spark.executor.instances</td> |
| <td></td> |
| <td>Executor instances. ex) 1, 4.</td> |
| </tr> |
| <tr> |
| <td>livy.spark.executor.cores</td> |
| <td></td> |
| <td>Num cores per executor. ex) 1, 4.</td> |
| </tr> |
| <tr> |
| <td>livy.spark.executor.memory</td> |
| <td></td> |
| <td>Executor memory per worker instance. ex) 512m, 32g.</td> |
| </tr> |
| <tr> |
| <td>livy.spark.dynamicAllocation.enabled</td> |
| <td></td> |
| <td>Use dynamic resource allocation. ex) True, False.</td> |
| </tr> |
| <tr> |
| <td>livy.spark.dynamicAllocation.cachedExecutorIdleTimeout</td> |
| <td></td> |
| <td>Remove an executor which has cached data blocks.</td> |
| </tr> |
| <tr> |
| <td>livy.spark.dynamicAllocation.minExecutors</td> |
| <td></td> |
| <td>Lower bound for the number of executors.</td> |
| </tr> |
| <tr> |
| <td>livy.spark.dynamicAllocation.initialExecutors</td> |
| <td></td> |
| <td>Initial number of executors to run.</td> |
| </tr> |
| <tr> |
| <td>livy.spark.dynamicAllocation.maxExecutors</td> |
| <td></td> |
| <td>Upper bound for the number of executors.</td> |
| </tr> |
| <tr> |
| <td>livy.spark.jars.packages</td> |
| <td></td> |
| <td>Adding extra libraries to livy interpreter</td> |
| </tr> |
| <tr> |
| <td>zeppelin.livy.ssl.trustStore</td> |
| <td></td> |
| <td>client trustStore file. Used when livy ssl is enabled</td> |
| </tr> |
| <tr> |
| <td>zeppelin.livy.ssl.trustStorePassword</td> |
| <td></td> |
| <td>password for trustStore file. Used when livy ssl is enabled</td> |
| </tr> |
| <tr> |
| <td>zeppelin.livy.ssl.trustStoreType</td> |
| <td>JKS</td> |
| <td>type of truststore. Either JKS or PKCS12.</td> |
| </tr> |
| <tr> |
| <td>zeppelin.livy.ssl.keyStore</td> |
| <td></td> |
| <td>client keyStore file. Needed if Livy requires two way SSL authentication.</td> |
| </tr> |
| <tr> |
| <td>zeppelin.livy.ssl.keyStorePassword</td> |
| <td></td> |
| <td>password for keyStore file.</td> |
| </tr> |
| <tr> |
| <td>zeppelin.livy.ssl.keyStoreType</td> |
| <td>JKS</td> |
| <td>type of keystore. Either JKS or PKCS12.</td> |
| </tr> |
| <tr> |
| <td>zeppelin.livy.ssl.keyPassword</td> |
| <td></td> |
| <td>password for key in the keyStore file. Defaults to zeppelin.livy.ssl.keyStorePassword.</td> |
| </tr> |
| <tr> |
| <td>zeppelin.livy.http.headers</td> |
| <td>key_1: value_1; key_2: value_2</td> |
| <td>custom http headers when calling livy rest api. Each http header is separated by `;`, and each header is one key value pair where key value is separated by `:`</td> |
| </tr> |
| </table> |
| |
| <p><strong>We remove livy.spark.master in zeppelin-0.7. Because we sugguest user to use livy 0.3 in zeppelin-0.7. And livy 0.3 don't allow to specify livy.spark.master, it enfornce yarn-cluster mode.</strong></p> |
| |
| <h2>Adding External libraries</h2> |
| |
| <p>You can load dynamic library to livy interpreter by set <code>livy.spark.jars.packages</code> property to comma-separated list of maven coordinates of jars to include on the driver and executor classpaths. The format for the coordinates should be groupId:artifactId:version.</p> |
| |
| <p>Example</p> |
| |
| <table class="table-configuration"> |
| <tr> |
| <th>Property</th> |
| <th>Example</th> |
| <th>Description</th> |
| </tr> |
| <tr> |
| <td>livy.spark.jars.packages</td> |
| <td>io.spray:spray-json_2.10:1.3.1</td> |
| <td>Adding extra libraries to livy interpreter</td> |
| </tr> |
| </table> |
| |
| <h2>How to use</h2> |
| |
| <p>Basically, you can use</p> |
| |
| <p><strong>spark</strong></p> |
| <div class="highlight"><pre><code class="scala language-scala" data-lang="scala"><span class="o">%</span><span class="n">livy</span><span class="o">.</span><span class="n">spark</span> |
| <span class="n">sc</span><span class="o">.</span><span class="n">version</span> |
| </code></pre></div> |
| <p><strong>pyspark</strong></p> |
| <div class="highlight"><pre><code class="python language-python" data-lang="python"><span class="o">%</span><span class="n">livy</span><span class="o">.</span><span class="n">pyspark</span> |
| <span class="k">print</span> <span class="s">"1"</span> |
| </code></pre></div> |
| <p><strong>sparkR</strong></p> |
| <div class="highlight"><pre><code class="r language-r" data-lang="r"><span class="o">%livy.sparkr</span> |
| <span class="o">hello <- function( name ) {</span> |
| <span class="o"> sprintf( "Hello, %</span>s<span class="s">", name );</span> |
| <span class="s">}</span> |
| |
| <span class="s">hello("</span>livy<span class="s">"</span><span class="err">)</span> |
| </code></pre></div> |
| <h2>Impersonation</h2> |
| |
| <p>When Zeppelin server is running with authentication enabled, |
| then this interpreter utilizes Livy’s user impersonation feature |
| i.e. sends extra parameter for creating and running a session ("proxyUser": "${loggedInUser}"). |
| This is particularly useful when multi users are sharing a Notebook server.</p> |
| |
| <h2>Apply Zeppelin Dynamic Forms</h2> |
| |
| <p>You can leverage <a href="../usage/dynamic_form/intro.html">Zeppelin Dynamic Form</a>. Form templates is only avalible for livy sql interpreter.</p> |
| <div class="highlight"><pre><code class="sql language-sql" data-lang="sql"><span class="o">%</span><span class="n">livy</span><span class="p">.</span><span class="k">sql</span> |
| <span class="k">select</span> <span class="o">*</span> <span class="k">from</span> <span class="n">products</span> <span class="k">where</span> <span class="err">${</span><span class="n">product_id</span><span class="o">=</span><span class="mi">1</span><span class="err">}</span> |
| </code></pre></div> |
| <p>And creating dynamic formst programmatically is not feasible in livy interpreter, because ZeppelinContext is not available in livy interpreter.</p> |
| |
| <h2>Shared SparkContext</h2> |
| |
| <p>Starting from livy 0.5 which is supported by Zeppelin 0.8.0, SparkContext is shared between scala, python, r and sql. |
| That means you can query the table via <code>%livy.sql</code> when this table is registered in <code>%livy.spark</code>, <code>%livy.pyspark</code>, <code>$livy.sparkr</code>.</p> |
| |
| <h2>FAQ</h2> |
| |
| <p>Livy debugging: If you see any of these in error console</p> |
| |
| <blockquote> |
| <p>Connect to livyhost:8998 [livyhost/127.0.0.1, livyhost/0:0:0:0:0:0:0:1] failed: Connection refused</p> |
| </blockquote> |
| |
| <p>Looks like the livy server is not up yet or the config is wrong</p> |
| |
| <blockquote> |
| <p>Exception: Session not found, Livy server would have restarted, or lost session.</p> |
| </blockquote> |
| |
| <p>The session would have timed out, you may need to restart the interpreter.</p> |
| |
| <blockquote> |
| <p>Blacklisted configuration values in session config: spark.master</p> |
| </blockquote> |
| |
| <p>Edit <code>conf/spark-blacklist.conf</code> file in livy server and comment out <code>#spark.master</code> line.</p> |
| |
| <p>If you choose to work on livy in <code>apps/spark/java</code> directory in <a href="https://github.com/cloudera/hue">https://github.com/cloudera/hue</a>, |
| copy <code>spark-user-configurable-options.template</code> to <code>spark-user-configurable-options.conf</code> file in livy server and comment out <code>#spark.master</code>.</p> |
| |
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