| |
| <!DOCTYPE html> |
| <html lang="en"> |
| <head> |
| <meta charset="utf-8"> |
| <title>Apache Zeppelin 0.9.0 Documentation: Scalding Interpreter for Apache Zeppelin</title> |
| <meta name="description" content="Scalding is an open source Scala library for writing MapReduce jobs."> |
| <meta name="author" content="The Apache Software Foundation"> |
| |
| <!-- Enable responsive viewport --> |
| <meta name="viewport" content="width=device-width, initial-scale=1.0"> |
| |
| <!-- Le HTML5 shim, for IE6-8 support of HTML elements --> |
| <!--[if lt IE 9]> |
| <script src="http://html5shim.googlecode.com/svn/trunk/html5.js"></script> |
| <![endif]--> |
| |
| <link href="/docs/0.9.0/assets/themes/zeppelin/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 --> |
| <!-- Update these with your own images |
| <link rel="shortcut icon" href="images/favicon.ico"> |
| <link rel="apple-touch-icon" href="images/apple-touch-icon.png"> |
| <link rel="apple-touch-icon" sizes="72x72" href="images/apple-touch-icon-72x72.png"> |
| <link rel="apple-touch-icon" sizes="114x114" href="images/apple-touch-icon-114x114.png"> |
| --> |
| |
| <!-- Js --> |
| <script src="/docs/0.9.0/assets/themes/zeppelin/jquery-1.10.2.min.js"></script> |
| <script src="/docs/0.9.0/assets/themes/zeppelin/bootstrap/js/bootstrap.min.js"></script> |
| <script src="/docs/0.9.0/assets/themes/zeppelin/js/docs.js"></script> |
| <script src="/docs/0.9.0/assets/themes/zeppelin/js/anchor.min.js"></script> |
| <script src="/docs/0.9.0/assets/themes/zeppelin/js/toc.js"></script> |
| <script src="/docs/0.9.0/assets/themes/zeppelin/js/lunr.min.js"></script> |
| <script src="/docs/0.9.0/assets/themes/zeppelin/js/search.js"></script> |
| |
| <!-- atom & rss feed --> |
| <link href="/docs/0.9.0/atom.xml" type="application/atom+xml" rel="alternate" title="Sitewide ATOM Feed"> |
| <link href="/docs/0.9.0/rss.xml" type="application/rss+xml" rel="alternate" title="Sitewide RSS Feed"> |
| |
| <!-- Matomo --> |
| <script> |
| var _paq = window._paq = window._paq || []; |
| /* tracker methods like "setCustomDimension" should be called before "trackPageView" */ |
| _paq.push(["setDoNotTrack", true]); |
| _paq.push(["disableCookies"]); |
| _paq.push(['trackPageView']); |
| _paq.push(['enableLinkTracking']); |
| (function() { |
| var u="https://analytics.apache.org/"; |
| _paq.push(['setTrackerUrl', u+'matomo.php']); |
| _paq.push(['setSiteId', '69']); |
| var d=document, g=d.createElement('script'), s=d.getElementsByTagName('script')[0]; |
| g.async=true; g.src=u+'matomo.js'; s.parentNode.insertBefore(g,s); |
| })(); |
| </script> |
| <!-- End Matomo Code --> |
| </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> |
| <li class="title"><span>Zeppelin SDK</span></li> |
| <li><a href="/docs/0.9.0/usage/zeppelin_sdk/client_api.html">Client API</a></li> |
| <li><a href="/docs/0.9.0/usage/zeppelin_sdk/session_api.html">Session 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/influxdb.html">influxDB</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/ksql.html">KSQL</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/mahout.html">Mahout</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/sap.html">SAP</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 Scalding 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>Scalding Interpreter for Apache Zeppelin</h1> |
| |
| <div id="toc"></div> |
| |
| <p><a href="https://github.com/twitter/scalding">Scalding</a> is an open source Scala library for writing MapReduce jobs.</p> |
| |
| <h2>Building the Scalding Interpreter</h2> |
| |
| <p>You have to first build the Scalding interpreter by enable the <strong>scalding</strong> profile as follows:</p> |
| <div class="highlight"><pre><code class="bash language-bash" data-lang="bash">mvn clean package -Pscalding -DskipTests |
| </code></pre></div> |
| <h2>Enabling the Scalding Interpreter</h2> |
| |
| <p>In a notebook, to enable the <strong>Scalding</strong> interpreter, click on the <strong>Gear</strong> icon,select <strong>Scalding</strong>, and hit <strong>Save</strong>.</p> |
| |
| <p><center></p> |
| |
| <p><img src="/docs/0.9.0/assets/themes/zeppelin/img/docs-img/scalding-InterpreterBinding.png" alt="Interpreter Binding"></p> |
| |
| <p><img src="/docs/0.9.0/assets/themes/zeppelin/img/docs-img/scalding-InterpreterSelection.png" alt="Interpreter Selection"></p> |
| |
| <p></center></p> |
| |
| <h2>Configuring the Interpreter</h2> |
| |
| <p>Scalding interpreter runs in two modes:</p> |
| |
| <ul> |
| <li>local</li> |
| <li>hdfs</li> |
| </ul> |
| |
| <p>In the local mode, you can access files on the local server and scalding transformation are done locally.</p> |
| |
| <p>In hdfs mode you can access files in HDFS and scalding transformation are run as hadoop map-reduce jobs.</p> |
| |
| <p>Zeppelin comes with a pre-configured Scalding interpreter in local mode.</p> |
| |
| <p>To run the scalding interpreter in the hdfs mode you have to do the following:</p> |
| |
| <p><strong>Set the classpath with ZEPPELIN_CLASSPATH_OVERRIDES</strong></p> |
| |
| <p>In conf/zeppelin<em>env.sh, you have to set |
| ZEPPELIN</em>CLASSPATH_OVERRIDES to the contents of 'hadoop classpath' |
| and directories with custom jar files you need for your scalding commands.</p> |
| |
| <p><strong>Set arguments to the scalding repl</strong></p> |
| |
| <p>The default arguments are: <code>--local --repl</code></p> |
| |
| <p>For hdfs mode you need to add: <code>--hdfs --repl</code></p> |
| |
| <p>If you want to add custom jars, you need to add: <code>-libjars directory/*:directory/*</code></p> |
| |
| <p>For reducer estimation, you need to add something like: |
| <code>-Dscalding.reducer.estimator.classes=com.twitter.scalding.reducer_estimation.InputSizeReducerEstimator</code></p> |
| |
| <p><strong>Set max.open.instances</strong></p> |
| |
| <p>If you want to control the maximum number of open interpreters, you have to select "scoped" interpreter for note |
| option and set <code>max.open.instances</code> argument.</p> |
| |
| <h2>Testing the Interpreter</h2> |
| |
| <h3>Local mode</h3> |
| |
| <p>In example, by using the <a href="https://gist.github.com/johnynek/a47699caa62f4f38a3e2">Alice in Wonderland</a> tutorial, |
| we will count words (of course!), and plot a graph of the top 10 words in the book.</p> |
| <div class="highlight"><pre><code class="scala language-scala" data-lang="scala"><span class="o">%</span><span class="n">scalding</span> |
| |
| <span class="k">import</span> <span class="nn">scala.io.Source</span> |
| |
| <span class="c1">// Get the Alice in Wonderland book from gutenberg.org:</span> |
| <span class="k">val</span> <span class="n">alice</span> <span class="k">=</span> <span class="nc">Source</span><span class="o">.</span><span class="n">fromURL</span><span class="o">(</span><span class="s">"http://www.gutenberg.org/files/11/11.txt"</span><span class="o">).</span><span class="n">getLines</span> |
| <span class="k">val</span> <span class="n">aliceLineNum</span> <span class="k">=</span> <span class="n">alice</span><span class="o">.</span><span class="n">zipWithIndex</span><span class="o">.</span><span class="n">toList</span> |
| <span class="k">val</span> <span class="n">alicePipe</span> <span class="k">=</span> <span class="nc">TypedPipe</span><span class="o">.</span><span class="n">from</span><span class="o">(</span><span class="n">aliceLineNum</span><span class="o">)</span> |
| |
| <span class="c1">// Now get a list of words for the book:</span> |
| <span class="k">val</span> <span class="n">aliceWords</span> <span class="k">=</span> <span class="n">alicePipe</span><span class="o">.</span><span class="n">flatMap</span> <span class="o">{</span> <span class="k">case</span> <span class="o">(</span><span class="n">text</span><span class="o">,</span> <span class="k">_</span><span class="o">)</span> <span class="k">=></span> <span class="n">text</span><span class="o">.</span><span class="n">split</span><span class="o">(</span><span class="s">"\\s+"</span><span class="o">).</span><span class="n">toList</span> <span class="o">}</span> |
| |
| <span class="c1">// Now lets add a count for each word:</span> |
| <span class="k">val</span> <span class="n">aliceWithCount</span> <span class="k">=</span> <span class="n">aliceWords</span><span class="o">.</span><span class="n">filterNot</span><span class="o">(</span><span class="k">_</span><span class="o">.</span><span class="n">equals</span><span class="o">(</span><span class="s">""</span><span class="o">)).</span><span class="n">map</span> <span class="o">{</span> <span class="n">word</span> <span class="k">=></span> <span class="o">(</span><span class="n">word</span><span class="o">,</span> <span class="mi">1L</span><span class="o">)</span> <span class="o">}</span> |
| |
| <span class="c1">// let's sum them for each word:</span> |
| <span class="k">val</span> <span class="n">wordCount</span> <span class="k">=</span> <span class="n">aliceWithCount</span><span class="o">.</span><span class="n">group</span><span class="o">.</span><span class="n">sum</span> |
| |
| <span class="n">print</span> <span class="o">(</span><span class="s">"Here are the top 10 words\n"</span><span class="o">)</span> |
| <span class="k">val</span> <span class="n">top10</span> <span class="k">=</span> <span class="n">wordCount</span> |
| <span class="o">.</span><span class="n">groupAll</span> |
| <span class="o">.</span><span class="n">sortBy</span> <span class="o">{</span> <span class="k">case</span> <span class="o">(</span><span class="n">word</span><span class="o">,</span> <span class="n">count</span><span class="o">)</span> <span class="k">=></span> <span class="o">-</span><span class="n">count</span> <span class="o">}</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">top10</span><span class="o">.</span><span class="n">dump</span> |
| </code></pre></div><div class="highlight"><pre><code class="text language-text" data-lang="text">%scalding |
| |
| val table = "words\t count\n" + top10.toIterator.map{case (k, (word, count)) => s"$word\t$count"}.mkString("\n") |
| print("%table " + table) |
| </code></pre></div> |
| <p>If you click on the icon for the pie chart, you should be able to see a chart like this: |
| <img src="/docs/0.9.0/assets/themes/zeppelin/img/docs-img/scalding-pie.png" alt="Scalding - Pie - Chart"></p> |
| |
| <h3>HDFS mode</h3> |
| |
| <p><strong>Test mode</strong></p> |
| <div class="highlight"><pre><code class="text language-text" data-lang="text">%scalding |
| mode |
| </code></pre></div> |
| <p>This command should print:</p> |
| <div class="highlight"><pre><code class="text language-text" data-lang="text">res4: com.twitter.scalding.Mode = Hdfs(true,Configuration: core-default.xml, core-site.xml, mapred-default.xml, mapred-site.xml, yarn-default.xml, yarn-site.xml, hdfs-default.xml, hdfs-site.xml) |
| </code></pre></div> |
| <p><strong>Test HDFS read</strong></p> |
| <div class="highlight"><pre><code class="scala language-scala" data-lang="scala"><span class="k">val</span> <span class="n">testfile</span> <span class="k">=</span> <span class="nc">TypedPipe</span><span class="o">.</span><span class="n">from</span><span class="o">(</span><span class="nc">TextLine</span><span class="o">(</span><span class="s">"/user/x/testfile"</span><span class="o">))</span> |
| <span class="n">testfile</span><span class="o">.</span><span class="n">dump</span> |
| </code></pre></div> |
| <p>This command should print the contents of the hdfs file /user/x/testfile.</p> |
| |
| <p><strong>Test map-reduce job</strong></p> |
| <div class="highlight"><pre><code class="scala language-scala" data-lang="scala"><span class="k">val</span> <span class="n">testfile</span> <span class="k">=</span> <span class="nc">TypedPipe</span><span class="o">.</span><span class="n">from</span><span class="o">(</span><span class="nc">TextLine</span><span class="o">(</span><span class="s">"/user/x/testfile"</span><span class="o">))</span> |
| <span class="k">val</span> <span class="n">a</span> <span class="k">=</span> <span class="n">testfile</span><span class="o">.</span><span class="n">groupAll</span><span class="o">.</span><span class="n">size</span><span class="o">.</span><span class="n">values</span> |
| <span class="n">a</span><span class="o">.</span><span class="n">toList</span> |
| </code></pre></div> |
| <p>This command should create a map reduce job.</p> |
| |
| <h2>Future Work</h2> |
| |
| <ul> |
| <li>Better user feedback (hadoop url, progress updates)</li> |
| <li>Ability to cancel jobs</li> |
| <li>Ability to dynamically load jars without restarting the interpreter</li> |
| <li>Multiuser scalability (run scalding interpreters on different servers)</li> |
| </ul> |
| |
| </div> |
| </div> |
| |
| |
| <hr> |
| <footer> |
| <!-- <p>© 2021 The Apache Software Foundation</p>--> |
| </footer> |
| </div> |
| |
| |
| |
| |
| |
| |
| |
| </body> |
| </html> |
| |
