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From don...@apache.org
Subject [27/51] [abbrv] [partial] incubator-predictionio-site git commit: Documentation based on apache/incubator-predictionio#1d8f19b91cb0926ccffc872a906e262050091c64
Date Wed, 02 Nov 2016 22:17:27 GMT
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+<!DOCTYPE html><html><head><title>Developing Engines with IntelliJ IDEA</title><meta charset="utf-8"/><meta content="IE=edge,chrome=1" http-equiv="X-UA-Compatible"/><meta name="viewport" content="width=device-width, initial-scale=1.0"/><meta class="swiftype" name="title" data-type="string" content="Developing Engines with IntelliJ IDEA"/><link rel="canonical" href="https://docs.prediction.io/resources/intellij/"/><link href="/images/favicon/normal-b330020a.png" rel="shortcut icon"/><link href="/images/favicon/apple-c0febcf2.png" rel="apple-touch-icon"/><link href="//fonts.googleapis.com/css?family=Open+Sans:300italic,400italic,600italic,700italic,800italic,400,300,600,700,800" rel="stylesheet"/><link href="//maxcdn.bootstrapcdn.com/font-awesome/4.2.0/css/font-awesome.min.css" rel="stylesheet"/><link href="/stylesheets/application-a2a2f408.css" rel="stylesheet" type="text/css"/><script src="//cdnjs.cloudflare.com/ajax/libs/html5shiv/3.7.2/html5shiv.min.js"></script><script src="//cdn
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 ol-xs-11"><div class="hidden-md hidden-lg" id="mobile-page-heading-wrapper"><p>PredictionIO Docs</p><h4>Developing Engines with IntelliJ IDEA</h4></div><h4 class="hidden-sm hidden-xs">PredictionIO Docs</h4></div><div class="col-md-3 col-sm-1 col-xs-1 hidden-md hidden-lg"><img id="left-menu-indicator" src="/images/icons/down-arrow-dfe9f7fe.png"/></div><div class="col-md-3 col-sm-12 col-xs-12 swiftype-wrapper"><div class="swiftype"><form class="search-form"><img class="search-box-toggler hidden-xs hidden-sm" src="/images/icons/search-glass-704bd4ff.png"/><div class="search-box"><img src="/images/icons/search-glass-704bd4ff.png"/><input type="text" id="st-search-input" class="st-search-input" placeholder="Search Doc..."/></div><img class="swiftype-row-hider hidden-md hidden-lg" src="/images/icons/drawer-toggle-active-fcbef12a.png"/></form></div></div><div class="mobile-left-menu-toggler hidden-md hidden-lg"></div></div></div></div><div id="page" class="container-fluid"><div class="row"
 ><div id="left-menu-wrapper" class="col-md-3"><nav id="nav-main"><ul><li class="level-1"><a class="expandible" href="/"><span>Apache PredictionIO (incubating) Documentation</span></a><ul><li class="level-2"><a class="final" href="/"><span>Welcome to Apache PredictionIO (incubating)</span></a></li></ul></li><li class="level-1"><a class="expandible" href="#"><span>Getting Started</span></a><ul><li class="level-2"><a class="final" href="/start/"><span>A Quick Intro</span></a></li><li class="level-2"><a class="final" href="/install/"><span>Installing Apache PredictionIO (incubating)</span></a></li><li class="level-2"><a class="final" href="/start/download/"><span>Downloading an Engine Template</span></a></li><li class="level-2"><a class="final" href="/start/deploy/"><span>Deploying Your First Engine</span></a></li><li class="level-2"><a class="final" href="/start/customize/"><span>Customizing the Engine</span></a></li></ul></li><li class="level-1"><a class="expandible" href="#"><span>In
 tegrating with Your App</span></a><ul><li class="level-2"><a class="final" href="/appintegration/"><span>App Integration Overview</span></a></li><li class="level-2"><a class="expandible" href="/sdk/"><span>List of SDKs</span></a><ul><li class="level-3"><a class="final" href="/sdk/java/"><span>Java & Android SDK</span></a></li><li class="level-3"><a class="final" href="/sdk/php/"><span>PHP SDK</span></a></li><li class="level-3"><a class="final" href="/sdk/python/"><span>Python SDK</span></a></li><li class="level-3"><a class="final" href="/sdk/ruby/"><span>Ruby SDK</span></a></li><li class="level-3"><a class="final" href="/sdk/community/"><span>Community Powered SDKs</span></a></li></ul></li></ul></li><li class="level-1"><a class="expandible" href="#"><span>Deploying an Engine</span></a><ul><li class="level-2"><a class="final" href="/deploy/"><span>Deploying as a Web Service</span></a></li><li class="level-2"><a class="final" href="/cli/#engine-commands"><span>Engine Command-line Inte
 rface</span></a></li><li class="level-2"><a class="final" href="/deploy/monitoring/"><span>Monitoring Engine</span></a></li><li class="level-2"><a class="final" href="/deploy/engineparams/"><span>Setting Engine Parameters</span></a></li><li class="level-2"><a class="final" href="/deploy/enginevariants/"><span>Deploying Multiple Engine Variants</span></a></li></ul></li><li class="level-1"><a class="expandible" href="#"><span>Customizing an Engine</span></a><ul><li class="level-2"><a class="final" href="/customize/"><span>Learning DASE</span></a></li><li class="level-2"><a class="final" href="/customize/dase/"><span>Implement DASE</span></a></li><li class="level-2"><a class="final" href="/customize/troubleshooting/"><span>Troubleshooting Engine Development</span></a></li><li class="level-2"><a class="final" href="/api/current/#package"><span>Engine Scala APIs</span></a></li></ul></li><li class="level-1"><a class="expandible" href="#"><span>Collecting and Analyzing Data</span></a><ul><
 li class="level-2"><a class="final" href="/datacollection/"><span>Event Server Overview</span></a></li><li class="level-2"><a class="final" href="/cli/#event-server-commands"><span>Event Server Command-line Interface</span></a></li><li class="level-2"><a class="final" href="/datacollection/eventapi/"><span>Collecting Data with REST/SDKs</span></a></li><li class="level-2"><a class="final" href="/datacollection/eventmodel/"><span>Events Modeling</span></a></li><li class="level-2"><a class="final" href="/datacollection/webhooks/"><span>Unifying Multichannel Data with Webhooks</span></a></li><li class="level-2"><a class="final" href="/datacollection/channel/"><span>Channel</span></a></li><li class="level-2"><a class="final" href="/datacollection/batchimport/"><span>Importing Data in Batch</span></a></li><li class="level-2"><a class="final" href="/datacollection/analytics/"><span>Using Analytics Tools</span></a></li></ul></li><li class="level-1"><a class="expandible" href="#"><span>Choos
 ing an Algorithm(s)</span></a><ul><li class="level-2"><a class="final" href="/algorithm/"><span>Built-in Algorithm Libraries</span></a></li><li class="level-2"><a class="final" href="/algorithm/switch/"><span>Switching to Another Algorithm</span></a></li><li class="level-2"><a class="final" href="/algorithm/multiple/"><span>Combining Multiple Algorithms</span></a></li><li class="level-2"><a class="final" href="/algorithm/custom/"><span>Adding Your Own Algorithms</span></a></li></ul></li><li class="level-1"><a class="expandible" href="#"><span>ML Tuning and Evaluation</span></a><ul><li class="level-2"><a class="final" href="/evaluation/"><span>Overview</span></a></li><li class="level-2"><a class="final" href="/evaluation/paramtuning/"><span>Hyperparameter Tuning</span></a></li><li class="level-2"><a class="final" href="/evaluation/evaluationdashboard/"><span>Evaluation Dashboard</span></a></li><li class="level-2"><a class="final" href="/evaluation/metricchoose/"><span>Choosing Evalua
 tion Metrics</span></a></li><li class="level-2"><a class="final" href="/evaluation/metricbuild/"><span>Building Evaluation Metrics</span></a></li></ul></li><li class="level-1"><a class="expandible" href="#"><span>System Architecture</span></a><ul><li class="level-2"><a class="final" href="/system/"><span>Architecture Overview</span></a></li><li class="level-2"><a class="final" href="/system/anotherdatastore/"><span>Using Another Data Store</span></a></li></ul></li><li class="level-1"><a class="expandible" href="#"><span>Engine Template Gallery</span></a><ul><li class="level-2"><a class="final" href="/gallery/template-gallery/"><span>Browse</span></a></li><li class="level-2"><a class="final" href="/community/submit-template/"><span>Submit your Engine as a Template</span></a></li></ul></li><li class="level-1"><a class="expandible" href="#"><span>Demo Tutorials</span></a><ul><li class="level-2"><a class="final" href="/demo/tapster/"><span>Comics Recommendation Demo</span></a></li><li c
 lass="level-2"><a class="final" href="/demo/community/"><span>Community Contributed Demo</span></a></li><li class="level-2"><a class="final" href="/demo/textclassification/"><span>Text Classification Engine Tutorial</span></a></li></ul></li><li class="level-1"><a class="expandible" href="/community/"><span>Getting Involved</span></a><ul><li class="level-2"><a class="final" href="/community/contribute-code/"><span>Contribute Code</span></a></li><li class="level-2"><a class="final" href="/community/contribute-documentation/"><span>Contribute Documentation</span></a></li><li class="level-2"><a class="final" href="/community/contribute-sdk/"><span>Contribute a SDK</span></a></li><li class="level-2"><a class="final" href="/community/contribute-webhook/"><span>Contribute a Webhook</span></a></li><li class="level-2"><a class="final" href="/community/projects/"><span>Community Projects</span></a></li></ul></li><li class="level-1"><a class="expandible" href="#"><span>Getting Help</span></a><
 ul><li class="level-2"><a class="final" href="/resources/faq/"><span>FAQs</span></a></li><li class="level-2"><a class="final" href="/support/"><span>Support</span></a></li></ul></li><li class="level-1"><a class="expandible" href="#"><span>Resources</span></a><ul><li class="level-2"><a class="final active" href="/resources/intellij/"><span>Developing Engines with IntelliJ IDEA</span></a></li><li class="level-2"><a class="final" href="/resources/upgrade/"><span>Upgrade Instructions</span></a></li><li class="level-2"><a class="final" href="/resources/glossary/"><span>Glossary</span></a></li></ul></li></ul></nav></div><div class="col-md-9 col-sm-12"><div class="content-header hidden-md hidden-lg"><div id="breadcrumbs" class="hidden-sm hidden xs"><ul><li><a href="#">Resources</a><span class="spacer">&gt;</span></li><li><span class="last">Developing Engines with IntelliJ IDEA</span></li></ul></div><div id="page-title"><h1>Developing Engines with IntelliJ IDEA</h1></div></div><div id="tabl
 e-of-content-wrapper"><h5>On this page</h5><aside id="table-of-contents"><ul> <li> <a href="#prerequisites">Prerequisites</a> </li> <li> <a href="#preparing-intellij-for-engine-development">Preparing IntelliJ for Engine Development</a> </li> <li> <a href="#running-and-debugging-in-intellij-idea">Running and Debugging in IntelliJ IDEA</a> </li> <li> <a href="#loading-a-template-into-intellij-idea">Loading a Template Into Intellij IDEA</a> </li> </ul> </aside><hr/><a id="edit-page-link" href="https://github.com/apache/incubator-predictionio/tree/livedoc/docs/manual/source/resources/intellij.html.md.erb"><img src="/images/icons/edit-pencil-d6c1bb3d.png"/>Edit this page</a></div><div class="content-header hidden-sm hidden-xs"><div id="breadcrumbs" class="hidden-sm hidden xs"><ul><li><a href="#">Resources</a><span class="spacer">&gt;</span></li><li><span class="last">Developing Engines with IntelliJ IDEA</span></li></ul></div><div id="page-title"><h1>Developing Engines with IntelliJ IDEA
 </h1></div></div><div class="content"><h2 id='prerequisites' class='header-anchors'>Prerequisites</h2><p>This documentation assumes that you have a fully functional PredictionIO setup. If you have not installed PredictionIO yet, please follow <a href="/install/">these instructions</a>.</p><h2 id='preparing-intellij-for-engine-development' class='header-anchors'>Preparing IntelliJ for Engine Development</h2><h3 id='installing-intellij-scala-plugin' class='header-anchors'>Installing IntelliJ Scala Plugin</h3><p>First of all, you will need to install the <a href="https://plugins.jetbrains.com/plugin/?id=1347">Scala plugin</a> if you have not already done so.</p><p>Go to the <em>Preferences</em> menu item, and look for <em>Plugins</em>. You should see the following screen.</p><p><img alt="IntelliJ Plugins" src="/images/intellij/intelliJ-scala-plugin-09ee074a.png"/></p><p>Click <em>Install JetBrains plugin...</em>, the search for <em>Scala</em>. You should arrive at something similar to 
 the following.</p><p><img alt="Scala Plugin" src="/images/intellij/intellij-scala-plugin-2-592c697f.png"/></p><p>Click the green <em>Install plugin</em> button to install the plugin. Restart IntelliJ IDEA if asked to do so.</p><h3 id='setting-up-the-engine-directory' class='header-anchors'>Setting Up the Engine Directory</h3><div class="alert-message info"><p>It is very important to run at least <code>pio build</code> once in your engine directory so that the project correctly recognizes the version of PredictionIO that you are using. If you upgraded your PredictionIO installation later, you will need to run <code>pio build</code> again in order for the engine to pick up the latest version of PredictionIO.</p></div><p>Create an engine directory from a template. This requires that you install a template that you wish to start from or modify. Follow template <a href="/start/download">install</a> and <a href="/start/deploy">deploy</a> instructions or go through the <a href="/templates/
 recommendation/quickstart/">Quick Start</a> if you are planning to modify a recommender. Make sure to build, train, and deploy the engine to make sure all is configured properly.</p><p>From IntelliJ IDEA, choose <em>File</em> &gt; <em>New</em> &gt; <em>Project from Existing Sources...</em>. When asked to select a directory to import, browse to the engine directory that you downloaded too and proceed. Make sure you pick <em>Import project from external model</em> &gt; <em>SBT</em>, then proceed to finish.</p><p>You should be able to build the project at this point. To run and debug PredictionIO server, continue on to the rest of the steps.</p><div class="alert-message info"><p>If you are running on OS X, you will need to do the following due to this <a href="http://bit.ly/12Abtvn">known issue</a>.</p></div><p>Edit <code>build.sbt</code> and add the following under <code>libraryDependencies</code></p><div class="highlight shell"><table style="border-spacing: 0"><tbody><tr><td class="g
 utter gl" style="text-align: right"><pre class="lineno">1</pre></td><td class="code"><pre><span class="s2">"org.xerial.snappy"</span> % <span class="s2">"snappy-java"</span> % <span class="s2">"1.1.1.7"</span>
+</pre></td></tr></tbody></table> </div> <p><img alt="Updating build.sbt" src="/images/intellij/intellij-buildsbt-05cfd141.png"/></p><p>When you are done editing, IntelliJ should either refresh the project automatically or prompt you to refresh.</p><h3 id='dependencies' class='header-anchors'>Dependencies</h3><p>IntelliJ has the annoying tendency to drop some dependencies when you refresh your build.sbt after any changes. To avoid this we put any jars that must be available at runtime into a separate empty module in the project then we make the main engine project depend on this dummy module for runtime classes.</p><p>Right click on the project and click <em>Open Module Settings</em>. In the second modules column hit <strong>+</strong> and create a new Scala module. Name it pio-runtime-jars and add these assemblies under the module dependencies tab and remember to change the scope of the jars to <strong>runtime</strong>:</p> <ul> <li><p> <code>pio-assembly-0.10.0-incubating.jar</code
 ></p><p>This JAR can be found inside the <code>assembly</code> or <code>lib</code> directory of your PredictionIO installation directory.</p></li> <li><p> <code>spark-assembly-1.5.2-hadoop2.4.0.jar</code></p><p>This JAR can be found inside the <code>assembly</code> or <code>lib</code> directory of your Apache Spark installation directory.</p></li> </ul> <p><img alt="Create empty module and add dependencies" src="/images/intellij/pio-runtime-jar-deps-3f3c99d9.png"/></p><p>Now make your engine module dependent on the pio-runtime-jars module for scope = runtime. </p><p><img alt="Create empty module and add dependencies" src="/images/intellij/pio-runtime-jars-266e8c1b.png"/></p><h2 id='running-and-debugging-in-intellij-idea' class='header-anchors'>Running and Debugging in IntelliJ IDEA</h2><h3 id='simulating-<code>pio-train</code>' class='header-anchors' >Simulating <code>pio train</code></h3><p>Create a new <em>Run/Debug Configuration</em> by going to <em>Run</em> &gt; <em>Edit Configu
 rations...</em>. Click on the <strong>+</strong> button and select <em>Application</em>. Name it <code>pio train</code> and put in the following.</p><div class="highlight shell"><table style="border-spacing: 0"><tbody><tr><td class="gutter gl" style="text-align: right"><pre class="lineno">1
+2
+3</pre></td><td class="code"><pre>Main class: org.apache.predictionio.workflow.CreateWorkflow
+VM options: -Dspark.master<span class="o">=</span><span class="nb">local</span> -Dlog4j.configuration<span class="o">=</span>file:/<span class="k">**</span>replace_with_your_PredictionIO_path<span class="k">**</span>/conf/log4j.properties
+Program arguments: --engine-id dummy --engine-version dummy --engine-variant engine.json
+</pre></td></tr></tbody></table> </div> <p>Click the <strong>...</strong> button to the right of <em>Environment variables</em>, and paste the following.</p><div class="highlight shell"><table style="border-spacing: 0"><tbody><tr><td class="gutter gl" style="text-align: right"><pre class="lineno">1
+2
+3
+4
+5
+6
+7
+8
+9
+10
+11
+12
+13
+14
+15
+16
+17
+18
+19
+20
+21</pre></td><td class="code"><pre><span class="nv">SPARK_HOME</span><span class="o">=</span>/<span class="k">**</span>reaplce_w_your_spark_binary_path<span class="k">**</span>
+<span class="nv">PIO_FS_BASEDIR</span><span class="o">=</span>/<span class="k">**</span>replace_w_your_path_to<span class="k">**</span>/.pio_store
+<span class="nv">PIO_FS_ENGINESDIR</span><span class="o">=</span>/<span class="k">**</span>replace_w_your_path_to<span class="k">**</span>/.pio_store/engines
+<span class="nv">PIO_FS_TMPDIR</span><span class="o">=</span>/<span class="k">**</span>replace_w_your_path_to<span class="k">*</span>/.pio_store/tmp
+<span class="nv">PIO_STORAGE_REPOSITORIES_METADATA_NAME</span><span class="o">=</span>predictionio_metadata
+<span class="nv">PIO_STORAGE_REPOSITORIES_METADATA_SOURCE</span><span class="o">=</span>ELASTICSEARCH
+<span class="nv">PIO_STORAGE_REPOSITORIES_MODELDATA_NAME</span><span class="o">=</span>pio_
+<span class="nv">PIO_STORAGE_REPOSITORIES_MODELDATA_SOURCE</span><span class="o">=</span>LOCALFS
+<span class="nv">PIO_STORAGE_REPOSITORIES_APPDATA_NAME</span><span class="o">=</span>predictionio_appdata
+<span class="nv">PIO_STORAGE_REPOSITORIES_APPDATA_SOURCE</span><span class="o">=</span>ELASTICSEARCH
+<span class="nv">PIO_STORAGE_REPOSITORIES_EVENTDATA_NAME</span><span class="o">=</span>predictionio_eventdata
+<span class="nv">PIO_STORAGE_REPOSITORIES_EVENTDATA_SOURCE</span><span class="o">=</span>HBASE
+<span class="nv">PIO_STORAGE_SOURCES_ELASTICSEARCH_TYPE</span><span class="o">=</span>elasticsearch
+<span class="nv">PIO_STORAGE_SOURCES_ELASTICSEARCH_HOSTS</span><span class="o">=</span>localhost
+<span class="nv">PIO_STORAGE_SOURCES_ELASTICSEARCH_PORTS</span><span class="o">=</span>9300
+<span class="nv">PIO_STORAGE_SOURCES_LOCALFS_TYPE</span><span class="o">=</span>localfs
+<span class="nv">PIO_STORAGE_SOURCES_LOCALFS_HOSTS</span><span class="o">=</span>/<span class="k">**</span>replace_w_your_path_to<span class="k">**</span>/.pio_store/models
+<span class="nv">PIO_STORAGE_SOURCES_LOCALFS_PORTS</span><span class="o">=</span>0
+<span class="nv">PIO_STORAGE_SOURCES_HBASE_TYPE</span><span class="o">=</span>hbase
+<span class="nv">PIO_STORAGE_SOURCES_HBASE_HOSTS</span><span class="o">=</span>0
+<span class="nv">PIO_STORAGE_SOURCES_HBASE_PORTS</span><span class="o">=</span>0
+</pre></td></tr></tbody></table> </div> <div class="alert-message info"><p>Remember to replace all paths that start with <code>**replace</code> with actual values. The directory <code>.pio_store</code> typically locates inside your home directory.</p></div><p>The end result should look something similar to this.</p><p><img alt="Run Configuration" src="/images/intellij/intellij-config-48c05039.png"/></p><p>Save and you can run or debug <code>pio train</code> with the new configuration!</p><h3 id='simulating-<code>pio-deploy</code>' class='header-anchors' >Simulating <code>pio deploy</code></h3><p>For <code>pio deploy</code>, simply duplicate the previous configuration and replace with the following.</p><div class="highlight shell"><table style="border-spacing: 0"><tbody><tr><td class="gutter gl" style="text-align: right"><pre class="lineno">1
+2</pre></td><td class="code"><pre>Main class: org.apache.predictionio.workflow.CreateServer
+Program Arguments: --engineInstanceId <span class="k">**</span>replace_with_the_id_from_pio_train<span class="k">**</span>
+</pre></td></tr></tbody></table> </div> <h3 id='executing-a-query' class='header-anchors'>Executing a Query</h3><p>You can execute a query with the correct SDK. For a recommender that has been trained with the sample MovieLens dataset perhaps the easiest query is a curl one. Start by running or debuging your <code>deploy</code> config so the service is waiting for the query. Then go to the &quot;Terminal&quot; tab at the very bottom of the IDEA window and enter the curl request:</p><p><code>$ curl -H &quot;Content-Type: application/json&quot; -d &#39;{ &quot;user&quot;: &quot;1&quot;, &quot;num&quot;: 4 }&#39; http://localhost:8000/queries.json</code></p><p>This should return something like:</p><div class="highlight shell"><table style="border-spacing: 0"><tbody><tr><td class="gutter gl" style="text-align: right"><pre class="lineno">1
+2
+3
+4
+5
+6</pre></td><td class="code"><pre><span class="o">{</span><span class="s2">"itemScores"</span>:[
+  <span class="o">{</span><span class="s2">"item"</span>:<span class="s2">"52"</span>,<span class="s2">"score"</span>:9.582509402541834<span class="o">}</span>,
+  <span class="o">{</span><span class="s2">"item"</span>:<span class="s2">"95"</span>,<span class="s2">"score"</span>:8.017236650368387<span class="o">}</span>,
+  <span class="o">{</span><span class="s2">"item"</span>:<span class="s2">"89"</span>,<span class="s2">"score"</span>:6.975951244053634<span class="o">}</span>,
+  <span class="o">{</span><span class="s2">"item"</span>:<span class="s2">"34"</span>,<span class="s2">"score"</span>:6.857457277981334<span class="o">}</span>
+<span class="o">]}</span>
+</pre></td></tr></tbody></table> </div> <div class="alert-message info"><p>If you hit a breakpoint you are likely to get a connection timeout. To see the data that would have been returned, just place a breakpoint where the response is created or run the query with no breakpoints.</p></div><h2 id='loading-a-template-into-intellij-idea' class='header-anchors'>Loading a Template Into Intellij IDEA</h2><p>To customize an existing <a href="/gallery/template-gallery">template</a> using Intellij IDEA, first pull it from the template gallery:</p><div class="highlight shell"><table style="border-spacing: 0"><tbody><tr><td class="gutter gl" style="text-align: right"><pre class="lineno">1</pre></td><td class="code"><pre><span class="gp">$ </span>pio template get &lt;Template Source&gt; &lt;New Engine Directory&gt;
+</pre></td></tr></tbody></table> </div> <p>Now, before opening the template with Intellij, run the following command in the new engine template directory</p><div class="highlight shell"><table style="border-spacing: 0"><tbody><tr><td class="gutter gl" style="text-align: right"><pre class="lineno">1</pre></td><td class="code"><pre><span class="gp">$ </span>pio build
+</pre></td></tr></tbody></table> </div> <p>This should update the pioVersion key in SBT to the version of PredictionIO you have installed, so that Intellij loads the correct JARS via its Auto-Import feature. Now, you can go ahead and open the file <code>build.sbt</code> with Intellij IDEA. You are now ready to <a href="/customize/">customize</a> your new engine template.</p></div></div></div></div><footer><div class="container"><div class="seperator"></div><div class="row"><div class="col-md-6 col-xs-6 footer-link-column"><div class="footer-link-column-row"><h4>Community</h4><ul><li><a href="//docs.prediction.io/install/" target="blank">Download</a></li><li><a href="//docs.prediction.io/" target="blank">Docs</a></li><li><a href="//github.com/apache/incubator-predictionio" target="blank">GitHub</a></li><li><a href="mailto:user-subscribe@predictionio.incubator.apache.org" target="blank">Subscribe to User Mailing List</a></li><li><a href="//stackoverflow.com/questions/tagged/prediction
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+<!DOCTYPE html><html><head><title>Upgrade Instructions</title><meta charset="utf-8"/><meta content="IE=edge,chrome=1" http-equiv="X-UA-Compatible"/><meta name="viewport" content="width=device-width, initial-scale=1.0"/><meta class="swiftype" name="title" data-type="string" content="Upgrade Instructions"/><link rel="canonical" href="https://docs.prediction.io/resources/upgrade/"/><link href="/images/favicon/normal-b330020a.png" rel="shortcut icon"/><link href="/images/favicon/apple-c0febcf2.png" rel="apple-touch-icon"/><link href="//fonts.googleapis.com/css?family=Open+Sans:300italic,400italic,600italic,700italic,800italic,400,300,600,700,800" rel="stylesheet"/><link href="//maxcdn.bootstrapcdn.com/font-awesome/4.2.0/css/font-awesome.min.css" rel="stylesheet"/><link href="/stylesheets/application-a2a2f408.css" rel="stylesheet" type="text/css"/><script src="//cdnjs.cloudflare.com/ajax/libs/html5shiv/3.7.2/html5shiv.min.js"></script><script src="//cdn.mathjax.org/mathjax/latest/MathJax
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 den-lg" id="mobile-page-heading-wrapper"><p>PredictionIO Docs</p><h4>Upgrade Instructions</h4></div><h4 class="hidden-sm hidden-xs">PredictionIO Docs</h4></div><div class="col-md-3 col-sm-1 col-xs-1 hidden-md hidden-lg"><img id="left-menu-indicator" src="/images/icons/down-arrow-dfe9f7fe.png"/></div><div class="col-md-3 col-sm-12 col-xs-12 swiftype-wrapper"><div class="swiftype"><form class="search-form"><img class="search-box-toggler hidden-xs hidden-sm" src="/images/icons/search-glass-704bd4ff.png"/><div class="search-box"><img src="/images/icons/search-glass-704bd4ff.png"/><input type="text" id="st-search-input" class="st-search-input" placeholder="Search Doc..."/></div><img class="swiftype-row-hider hidden-md hidden-lg" src="/images/icons/drawer-toggle-active-fcbef12a.png"/></form></div></div><div class="mobile-left-menu-toggler hidden-md hidden-lg"></div></div></div></div><div id="page" class="container-fluid"><div class="row"><div id="left-menu-wrapper" class="col-md-3"><nav i
 d="nav-main"><ul><li class="level-1"><a class="expandible" href="/"><span>Apache PredictionIO (incubating) Documentation</span></a><ul><li class="level-2"><a class="final" href="/"><span>Welcome to Apache PredictionIO (incubating)</span></a></li></ul></li><li class="level-1"><a class="expandible" href="#"><span>Getting Started</span></a><ul><li class="level-2"><a class="final" href="/start/"><span>A Quick Intro</span></a></li><li class="level-2"><a class="final" href="/install/"><span>Installing Apache PredictionIO (incubating)</span></a></li><li class="level-2"><a class="final" href="/start/download/"><span>Downloading an Engine Template</span></a></li><li class="level-2"><a class="final" href="/start/deploy/"><span>Deploying Your First Engine</span></a></li><li class="level-2"><a class="final" href="/start/customize/"><span>Customizing the Engine</span></a></li></ul></li><li class="level-1"><a class="expandible" href="#"><span>Integrating with Your App</span></a><ul><li class="lev
 el-2"><a class="final" href="/appintegration/"><span>App Integration Overview</span></a></li><li class="level-2"><a class="expandible" href="/sdk/"><span>List of SDKs</span></a><ul><li class="level-3"><a class="final" href="/sdk/java/"><span>Java & Android SDK</span></a></li><li class="level-3"><a class="final" href="/sdk/php/"><span>PHP SDK</span></a></li><li class="level-3"><a class="final" href="/sdk/python/"><span>Python SDK</span></a></li><li class="level-3"><a class="final" href="/sdk/ruby/"><span>Ruby SDK</span></a></li><li class="level-3"><a class="final" href="/sdk/community/"><span>Community Powered SDKs</span></a></li></ul></li></ul></li><li class="level-1"><a class="expandible" href="#"><span>Deploying an Engine</span></a><ul><li class="level-2"><a class="final" href="/deploy/"><span>Deploying as a Web Service</span></a></li><li class="level-2"><a class="final" href="/cli/#engine-commands"><span>Engine Command-line Interface</span></a></li><li class="level-2"><a class="f
 inal" href="/deploy/monitoring/"><span>Monitoring Engine</span></a></li><li class="level-2"><a class="final" href="/deploy/engineparams/"><span>Setting Engine Parameters</span></a></li><li class="level-2"><a class="final" href="/deploy/enginevariants/"><span>Deploying Multiple Engine Variants</span></a></li></ul></li><li class="level-1"><a class="expandible" href="#"><span>Customizing an Engine</span></a><ul><li class="level-2"><a class="final" href="/customize/"><span>Learning DASE</span></a></li><li class="level-2"><a class="final" href="/customize/dase/"><span>Implement DASE</span></a></li><li class="level-2"><a class="final" href="/customize/troubleshooting/"><span>Troubleshooting Engine Development</span></a></li><li class="level-2"><a class="final" href="/api/current/#package"><span>Engine Scala APIs</span></a></li></ul></li><li class="level-1"><a class="expandible" href="#"><span>Collecting and Analyzing Data</span></a><ul><li class="level-2"><a class="final" href="/datacolle
 ction/"><span>Event Server Overview</span></a></li><li class="level-2"><a class="final" href="/cli/#event-server-commands"><span>Event Server Command-line Interface</span></a></li><li class="level-2"><a class="final" href="/datacollection/eventapi/"><span>Collecting Data with REST/SDKs</span></a></li><li class="level-2"><a class="final" href="/datacollection/eventmodel/"><span>Events Modeling</span></a></li><li class="level-2"><a class="final" href="/datacollection/webhooks/"><span>Unifying Multichannel Data with Webhooks</span></a></li><li class="level-2"><a class="final" href="/datacollection/channel/"><span>Channel</span></a></li><li class="level-2"><a class="final" href="/datacollection/batchimport/"><span>Importing Data in Batch</span></a></li><li class="level-2"><a class="final" href="/datacollection/analytics/"><span>Using Analytics Tools</span></a></li></ul></li><li class="level-1"><a class="expandible" href="#"><span>Choosing an Algorithm(s)</span></a><ul><li class="level-2
 "><a class="final" href="/algorithm/"><span>Built-in Algorithm Libraries</span></a></li><li class="level-2"><a class="final" href="/algorithm/switch/"><span>Switching to Another Algorithm</span></a></li><li class="level-2"><a class="final" href="/algorithm/multiple/"><span>Combining Multiple Algorithms</span></a></li><li class="level-2"><a class="final" href="/algorithm/custom/"><span>Adding Your Own Algorithms</span></a></li></ul></li><li class="level-1"><a class="expandible" href="#"><span>ML Tuning and Evaluation</span></a><ul><li class="level-2"><a class="final" href="/evaluation/"><span>Overview</span></a></li><li class="level-2"><a class="final" href="/evaluation/paramtuning/"><span>Hyperparameter Tuning</span></a></li><li class="level-2"><a class="final" href="/evaluation/evaluationdashboard/"><span>Evaluation Dashboard</span></a></li><li class="level-2"><a class="final" href="/evaluation/metricchoose/"><span>Choosing Evaluation Metrics</span></a></li><li class="level-2"><a c
 lass="final" href="/evaluation/metricbuild/"><span>Building Evaluation Metrics</span></a></li></ul></li><li class="level-1"><a class="expandible" href="#"><span>System Architecture</span></a><ul><li class="level-2"><a class="final" href="/system/"><span>Architecture Overview</span></a></li><li class="level-2"><a class="final" href="/system/anotherdatastore/"><span>Using Another Data Store</span></a></li></ul></li><li class="level-1"><a class="expandible" href="#"><span>Engine Template Gallery</span></a><ul><li class="level-2"><a class="final" href="/gallery/template-gallery/"><span>Browse</span></a></li><li class="level-2"><a class="final" href="/community/submit-template/"><span>Submit your Engine as a Template</span></a></li></ul></li><li class="level-1"><a class="expandible" href="#"><span>Demo Tutorials</span></a><ul><li class="level-2"><a class="final" href="/demo/tapster/"><span>Comics Recommendation Demo</span></a></li><li class="level-2"><a class="final" href="/demo/communit
 y/"><span>Community Contributed Demo</span></a></li><li class="level-2"><a class="final" href="/demo/textclassification/"><span>Text Classification Engine Tutorial</span></a></li></ul></li><li class="level-1"><a class="expandible" href="/community/"><span>Getting Involved</span></a><ul><li class="level-2"><a class="final" href="/community/contribute-code/"><span>Contribute Code</span></a></li><li class="level-2"><a class="final" href="/community/contribute-documentation/"><span>Contribute Documentation</span></a></li><li class="level-2"><a class="final" href="/community/contribute-sdk/"><span>Contribute a SDK</span></a></li><li class="level-2"><a class="final" href="/community/contribute-webhook/"><span>Contribute a Webhook</span></a></li><li class="level-2"><a class="final" href="/community/projects/"><span>Community Projects</span></a></li></ul></li><li class="level-1"><a class="expandible" href="#"><span>Getting Help</span></a><ul><li class="level-2"><a class="final" href="/resou
 rces/faq/"><span>FAQs</span></a></li><li class="level-2"><a class="final" href="/support/"><span>Support</span></a></li></ul></li><li class="level-1"><a class="expandible" href="#"><span>Resources</span></a><ul><li class="level-2"><a class="final" href="/resources/intellij/"><span>Developing Engines with IntelliJ IDEA</span></a></li><li class="level-2"><a class="final active" href="/resources/upgrade/"><span>Upgrade Instructions</span></a></li><li class="level-2"><a class="final" href="/resources/glossary/"><span>Glossary</span></a></li></ul></li></ul></nav></div><div class="col-md-9 col-sm-12"><div class="content-header hidden-md hidden-lg"><div id="breadcrumbs" class="hidden-sm hidden xs"><ul><li><a href="#">Resources</a><span class="spacer">&gt;</span></li><li><span class="last">Upgrade Instructions</span></li></ul></div><div id="page-title"><h1>Upgrade Instructions</h1></div></div><div id="table-of-content-wrapper"><h5>On this page</h5><aside id="table-of-contents"><ul> <li> <a 
 href="#how-to-upgrade">How to upgrade</a> </li> <li> <a href="#additional-notes-for-specific-versions-upgrade">Additional Notes for Specific Versions Upgrade</a> <ul> <li> <a href="#upgrade-to-0-9-2">Upgrade to 0.9.2</a> </li> <li> <a href="#upgrade-to-0-9-0">Upgrade to 0.9.0</a> </li> <li> <a href="#upgrade-to-0-8-4">Upgrade to 0.8.4</a> </li> <li> <a href="#upgrade-from-0-8-2-to-0-8-3">Upgrade from 0.8.2 to 0.8.3</a> </li> <li> <a href="#schema-changes-in-0-8-2">Schema Changes in 0.8.2</a> </li> <li> <a href="#experimental-upgrade-tool-upgrade-hbase-schema-from-0-8-0-0-8-1-to-0-8-2">Experimental upgrade tool (Upgrade HBase schema from 0.8.0/0.8.1 to 0.8.2)</a> </li> </ul> </li> </ul> </aside><hr/><a id="edit-page-link" href="https://github.com/apache/incubator-predictionio/tree/livedoc/docs/manual/source/resources/upgrade.html.md"><img src="/images/icons/edit-pencil-d6c1bb3d.png"/>Edit this page</a></div><div class="content-header hidden-sm hidden-xs"><div id="breadcrumbs" class="
 hidden-sm hidden xs"><ul><li><a href="#">Resources</a><span class="spacer">&gt;</span></li><li><span class="last">Upgrade Instructions</span></li></ul></div><div id="page-title"><h1>Upgrade Instructions</h1></div></div><div class="content"><p>This page highlights major changes in each version and upgrade tools.</p><h1 id='how-to-upgrade' class='header-anchors'>How to upgrade</h1><p>To upgrade and use new version of PredictionIO, do the following:</p> <ul> <li>Download and unzip the new PredictionIO binary (the download path can be found in the <a href="/install/install-linux/#method-2:-manual-install">Download PredictionIO section</a>)</li> <li>Retain the setting from current PredictionIO/conf/pio-env.sh to the new PredictionIO/conf/pio-env.sh.</li> <li>If you have added PredictionIO/bin to your <code>PATH</code> environment variable before, change it to the new PredictionIO/bin as well.</li> </ul> <h1 id='additional-notes-for-specific-versions-upgrade' class='header-anchors'>Additi
 onal Notes for Specific Versions Upgrade</h1><p>In addition, please take notes of the following for specific version upgrade.</p><h2 id='upgrade-to-0.9.2' class='header-anchors'>Upgrade to 0.9.2</h2><p>The Spark dependency has been upgraded to version 1.3.0. All engines must be rebuilt against it in order to work.</p><p>Open and edit <code>build.sbt</code> of your engine, and look for these two lines:</p><div class="highlight scala"><table style="border-spacing: 0"><tbody><tr><td class="gutter gl" style="text-align: right"><pre class="lineno">1
+2
+3</pre></td><td class="code"><pre><span class="s">"org.apache.spark"</span> <span class="o">%%</span> <span class="s">"spark-core"</span>    <span class="o">%</span> <span class="s">"1.2.0"</span> <span class="o">%</span> <span class="s">"provided"</span>
+
+<span class="s">"org.apache.spark"</span> <span class="o">%%</span> <span class="s">"spark-mllib"</span>   <span class="o">%</span> <span class="s">"1.2.0"</span> <span class="o">%</span> <span class="s">"provided"</span>
+</pre></td></tr></tbody></table> </div> <p>Change <code>1.2.0</code> to <code>1.3.0</code>, and do a clean rebuild by <code>pio build --clean</code>. Your engine should now work with the latest Apache Spark.</p><h3 id='new-peventstore-and-leventstore-api' class='header-anchors'>New PEventStore and LEventStore API</h3><p>In addition, new PEventStore and LEventStore API are introduced so that appName can be used as parameters in engine.json to access Event Store.</p><div class="alert-message note"><p>The following changes are not required for using 0.9.2 but it&#39;s recommended to upgrade your engine code as described below because the old API will be deprecated.</p></div><h4 id='1.-in-<strong>datasource.scala</strong>:' class='header-anchors' >1. In <strong>DataSource.scala</strong>:</h4> <ul> <li><p>remove this line of code:</p><div class="highlight scala"><table style="border-spacing: 0"><tbody><tr><td class="gutter gl" style="text-align: right"><pre class="lineno">1</pre></td><td
  class="code"><pre><span class="k">import</span> <span class="nn">org.apache.predictionio.data.storage.Storage</span>
+</pre></td></tr></tbody></table> </div> <p>and replace it by</p><div class="highlight scala"><table style="border-spacing: 0"><tbody><tr><td class="gutter gl" style="text-align: right"><pre class="lineno">1</pre></td><td class="code"><pre><span class="k">import</span> <span class="nn">org.apache.predictionio.data.store.PEventStore</span>
+</pre></td></tr></tbody></table> </div></li> <li><p>Change <code>appId: Int</code> to <code>appName: String</code> in DataSourceParams</p><p>For example,</p><div class="highlight scala"><table style="border-spacing: 0"><tbody><tr><td class="gutter gl" style="text-align: right"><pre class="lineno">1</pre></td><td class="code"><pre><span class="k">case</span> <span class="k">class</span> <span class="nc">DataSourceParams</span><span class="o">(</span><span class="n">appName</span><span class="k">:</span> <span class="kt">String</span><span class="o">)</span> <span class="k">extends</span> <span class="nc">Params</span>
+</pre></td></tr></tbody></table> </div></li> <li><p>remove this line of code: <code>val eventsDb = Storage.getPEvents()</code></p></li> <li><p>locate where <code>eventsDb.aggregateProperties()</code> is used, change it to <code>PEventStore.aggregateProperties()</code>:</p><p>For example,</p><div class="highlight scala"><table style="border-spacing: 0"><tbody><tr><td class="gutter gl" style="text-align: right"><pre class="lineno">1
+2
+3
+4
+5
+6</pre></td><td class="code"><pre>
+  <span class="k">val</span> <span class="n">usersRDD</span><span class="k">:</span> <span class="kt">RDD</span><span class="o">[(</span><span class="kt">String</span>, <span class="kt">User</span><span class="o">)]</span> <span class="k">=</span> <span class="nc">PEventStore</span><span class="o">.</span><span class="n">aggregateProperties</span><span class="o">(</span> <span class="c1">// CHANGED
+</span>    <span class="n">appName</span> <span class="k">=</span> <span class="n">dsp</span><span class="o">.</span><span class="n">appName</span><span class="o">,</span> <span class="c1">// CHANGED: use appName
+</span>    <span class="n">entityType</span> <span class="k">=</span> <span class="s">"user"</span>
+  <span class="o">)(</span><span class="n">sc</span><span class="o">).</span><span class="n">map</span> <span class="o">{</span> <span class="o">...</span> <span class="o">}</span>
+
+</pre></td></tr></tbody></table> </div></li> <li><p>locate where <code>eventsDb.find()</code>is used, change it to <code>PEventStore.find()</code></p><p>For example,</p><div class="highlight scala"><table style="border-spacing: 0"><tbody><tr><td class="gutter gl" style="text-align: right"><pre class="lineno">1
+2
+3
+4
+5
+6</pre></td><td class="code"><pre>
+  <span class="k">val</span> <span class="n">viewEventsRDD</span><span class="k">:</span> <span class="kt">RDD</span><span class="o">[</span><span class="kt">ViewEvent</span><span class="o">]</span> <span class="k">=</span> <span class="nc">PEventStore</span><span class="o">.</span><span class="n">find</span><span class="o">(</span> <span class="c1">// CHANGED
+</span>    <span class="n">appName</span> <span class="k">=</span> <span class="n">dsp</span><span class="o">.</span><span class="n">appName</span><span class="o">,</span> <span class="c1">// CHANGED: use appName
+</span>    <span class="n">entityType</span> <span class="k">=</span> <span class="nc">Some</span><span class="o">(</span><span class="s">"user"</span><span class="o">),</span>
+    <span class="o">...</span>
+
+</pre></td></tr></tbody></table> </div></li> </ul> <h4 id='2.-in-<strong>xxxalgorithm.scala</strong>:' class='header-anchors' >2. In <strong>XXXAlgorithm.scala</strong>:</h4><p>If Storage.getLEvents() is also used in Algorithm (such as ALSAlgorithm of E-Commerce Recommendation template), you also need to do following:</p><div class="alert-message note"><p>If <code>org.apache.predictionio.data.storage.Storage</code> is not used at all (such as Recommendation, Similar Product, Classification, Lead Scoring, Product Ranking template), there is no need to change Algorithm and can go to the later <strong>engine.json</strong> section.</p></div> <ul> <li>remove <code>import org.apache.predictionio.data.storage.Storage</code> and replace it by <code>import org.apache.predictionio.data.store.LEventStore</code></li> <li>change <code>appId</code> to <code>appName</code> in the XXXAlgorithmParams class.</li> <li>remove this line of code: <code>@transient lazy val lEventsDb = Storage.getLEvents()
 </code></li> <li><p>locate where <code>LEventStore.findByEntity()</code> is used, change it to <code>LEventStore.findByEntity()</code>:</p><p>For example, change following code</p><div class="highlight scala"><table style="border-spacing: 0"><tbody><tr><td class="gutter gl" style="text-align: right"><pre class="lineno">1
+2
+3
+4
+5
+6
+7
+8
+9
+10
+11
+12
+13
+14
+15
+16</pre></td><td class="code"><pre>  <span class="o">...</span>
+  <span class="k">val</span> <span class="n">seenEvents</span><span class="k">:</span> <span class="kt">Iterator</span><span class="o">[</span><span class="kt">Event</span><span class="o">]</span> <span class="k">=</span> <span class="n">lEventsDb</span><span class="o">.</span><span class="n">findSingleEntity</span><span class="o">(</span>
+    <span class="n">appId</span> <span class="k">=</span> <span class="n">ap</span><span class="o">.</span><span class="n">appId</span><span class="o">,</span>
+    <span class="n">entityType</span> <span class="k">=</span> <span class="s">"user"</span><span class="o">,</span>
+    <span class="n">entityId</span> <span class="k">=</span> <span class="n">query</span><span class="o">.</span><span class="n">user</span><span class="o">,</span>
+    <span class="n">eventNames</span> <span class="k">=</span> <span class="nc">Some</span><span class="o">(</span><span class="n">ap</span><span class="o">.</span><span class="n">seenEvents</span><span class="o">),</span>
+    <span class="n">targetEntityType</span> <span class="k">=</span> <span class="nc">Some</span><span class="o">(</span><span class="nc">Some</span><span class="o">(</span><span class="s">"item"</span><span class="o">)),</span>
+    <span class="c1">// set time limit to avoid super long DB access
+</span>    <span class="n">timeout</span> <span class="k">=</span> <span class="nc">Duration</span><span class="o">(</span><span class="mi">200</span><span class="o">,</span> <span class="s">"millis"</span><span class="o">)</span>
+  <span class="o">)</span> <span class="k">match</span> <span class="o">{</span>
+    <span class="k">case</span> <span class="nc">Right</span><span class="o">(</span><span class="n">x</span><span class="o">)</span> <span class="k">=&gt;</span> <span class="n">x</span>
+    <span class="k">case</span> <span class="nc">Left</span><span class="o">(</span><span class="n">e</span><span class="o">)</span> <span class="k">=&gt;</span> <span class="o">{</span>
+      <span class="n">logger</span><span class="o">.</span><span class="n">error</span><span class="o">(</span><span class="n">s</span><span class="s">"Error when read seen events: ${e}"</span><span class="o">)</span>
+      <span class="nc">Iterator</span><span class="o">[</span><span class="kt">Event</span><span class="o">]()</span>
+    <span class="o">}</span>
+  <span class="o">}</span>
+</pre></td></tr></tbody></table> </div> <p>to</p><div class="highlight scala"><table style="border-spacing: 0"><tbody><tr><td class="gutter gl" style="text-align: right"><pre class="lineno">1
+2
+3
+4
+5
+6
+7
+8
+9
+10
+11
+12
+13
+14
+15
+16
+17
+18
+19</pre></td><td class="code"><pre>  <span class="k">val</span> <span class="n">seenEvents</span><span class="k">:</span> <span class="kt">Iterator</span><span class="o">[</span><span class="kt">Event</span><span class="o">]</span> <span class="k">=</span> <span class="k">try</span> <span class="o">{</span> <span class="c1">// CHANGED: try catch block is used
+</span>    <span class="nc">LEventStore</span><span class="o">.</span><span class="n">findByEntity</span><span class="o">(</span> <span class="c1">// CHANGED: new API
+</span>      <span class="n">appName</span> <span class="k">=</span> <span class="n">ap</span><span class="o">.</span><span class="n">appName</span><span class="o">,</span> <span class="c1">// CHANGED: use appName
+</span>      <span class="n">entityType</span> <span class="k">=</span> <span class="s">"user"</span><span class="o">,</span>
+      <span class="n">entityId</span> <span class="k">=</span> <span class="n">query</span><span class="o">.</span><span class="n">user</span><span class="o">,</span>
+      <span class="n">eventNames</span> <span class="k">=</span> <span class="nc">Some</span><span class="o">(</span><span class="n">ap</span><span class="o">.</span><span class="n">seenEvents</span><span class="o">),</span>
+      <span class="n">targetEntityType</span> <span class="k">=</span> <span class="nc">Some</span><span class="o">(</span><span class="nc">Some</span><span class="o">(</span><span class="s">"item"</span><span class="o">)),</span>
+      <span class="c1">// set time limit to avoid super long DB access
+</span>      <span class="n">timeout</span> <span class="k">=</span> <span class="nc">Duration</span><span class="o">(</span><span class="mi">200</span><span class="o">,</span> <span class="s">"millis"</span><span class="o">)</span>
+    <span class="o">)</span>
+  <span class="o">}</span> <span class="k">catch</span> <span class="o">{</span> <span class="c1">// CHANGED: try catch block is used
+</span>    <span class="k">case</span> <span class="n">e</span><span class="k">:</span> <span class="kt">scala.concurrent.TimeoutException</span> <span class="o">=&gt;</span>
+      <span class="n">logger</span><span class="o">.</span><span class="n">error</span><span class="o">(</span><span class="n">s</span><span class="s">"Timeout when read seen events."</span> <span class="o">+</span>
+        <span class="n">s</span><span class="s">" Empty list is used. ${e}"</span><span class="o">)</span>
+      <span class="nc">Iterator</span><span class="o">[</span><span class="kt">Event</span><span class="o">]()</span>
+    <span class="k">case</span> <span class="n">e</span><span class="k">:</span> <span class="kt">Exception</span> <span class="o">=&gt;</span>
+      <span class="n">logger</span><span class="o">.</span><span class="n">error</span><span class="o">(</span><span class="n">s</span><span class="s">"Error when read seen events: ${e}"</span><span class="o">)</span>
+      <span class="k">throw</span> <span class="n">e</span>
+  <span class="o">}</span>
+</pre></td></tr></tbody></table> </div> <p>If you are using E-Commerce Recommendation template, please refer to the latest version for other updates related to <code>LEventStore.findByEntity()</code></p></li> </ul> <h4 id='3.-in-<strong>engine.json</strong>:' class='header-anchors' >3. In <strong>engine.json</strong>:</h4><p>locate where <code>appId</code> is used, change it to <code>appName</code> and specify the name of the app instead.</p><p>For example:</p><div class="highlight json"><table style="border-spacing: 0"><tbody><tr><td class="gutter gl" style="text-align: right"><pre class="lineno">1
+2
+3
+4
+5
+6
+7
+8</pre></td><td class="code"><pre><span class="w">  </span><span class="err">...</span><span class="w">
+
+  </span><span class="s2">"datasource"</span><span class="err">:</span><span class="w"> </span><span class="p">{</span><span class="w">
+    </span><span class="s2">"params"</span><span class="w"> </span><span class="p">:</span><span class="w"> </span><span class="p">{</span><span class="w">
+      </span><span class="s2">"appName"</span><span class="p">:</span><span class="w"> </span><span class="s2">"MyAppName"</span><span class="w">
+    </span><span class="p">}</span><span class="w">
+  </span><span class="p">}</span><span class="err">,</span><span class="w">
+
+</span></pre></td></tr></tbody></table> </div> <p>Note that other components such as <code>algorithms</code> may also have <code>appId</code> param (e.g. E-Commerce Recommendation template). Remember to change it to <code>appName</code> as well.</p><p>That&#39;s it! You can re-biuld your engine to try it out!</p><h2 id='upgrade-to-0.9.0' class='header-anchors'>Upgrade to 0.9.0</h2><p>0.9.0 has the following new changes:</p> <ul> <li><p>The signature of <code>P2LAlgorithm</code> and <code>PAlgorithm</code>&#39;s <code>train()</code> method is changed from</p><div class="highlight scala"><table style="border-spacing: 0"><tbody><tr><td class="gutter gl" style="text-align: right"><pre class="lineno">1</pre></td><td class="code"><pre>  <span class="k">def</span> <span class="n">train</span><span class="o">(</span><span class="n">pd</span><span class="k">:</span> <span class="kt">PD</span><span class="o">)</span><span class="k">:</span> <span class="kt">M</span>
+</pre></td></tr></tbody></table> </div> <p>to</p><div class="highlight scala"><table style="border-spacing: 0"><tbody><tr><td class="gutter gl" style="text-align: right"><pre class="lineno">1</pre></td><td class="code"><pre>  <span class="k">def</span> <span class="n">train</span><span class="o">(</span><span class="n">sc</span><span class="k">:</span> <span class="kt">SparkContext</span><span class="o">,</span> <span class="n">pd</span><span class="k">:</span> <span class="kt">PD</span><span class="o">)</span><span class="k">:</span> <span class="kt">M</span>
+</pre></td></tr></tbody></table> </div> <p>which allows you to access SparkContext inside <code>train()</code> with this new parameter <code>sc</code>.</p></li> <li><p>A new SBT build plugin (<code>pio-build</code>) is added for engine template</p></li> </ul> <div class="alert-message warning"><p>If you have existing engine templates running with previous version of PredictionIO, you need to either download the latest templates which are compatible with 0.9.0, or follow the instructions below to modify them.</p></div><p>Follow instructions below to modify existing engine templates to be compatible with PredictionIO 0.9.0:</p> <ol> <li><p>Add a new parameter <code>sc: SparkContext</code> in the signature of <code>train()</code> method of algorithm in the templates.</p><p>For example, in Recommendation engine template, you will find the following <code>train()</code> function in <code>ALSAlgorithm.scala</code></p><div class="highlight scala"><table style="border-spacing: 0"><tbody><tr
 ><td class="gutter gl" style="text-align: right"><pre class="lineno">1
+2
+3
+4
+5
+6
+7
+8
+9</pre></td><td class="code"><pre><span class="k">class</span> <span class="nc">ALSAlgorithm</span><span class="o">(</span><span class="k">val</span> <span class="n">ap</span><span class="k">:</span> <span class="kt">ALSAlgorithmParams</span><span class="o">)</span>
+  <span class="k">extends</span> <span class="n">P2LAlgorithm</span><span class="o">[</span><span class="kt">PreparedData</span>, <span class="kt">ALSModel</span>, <span class="kt">Query</span>, <span class="kt">PredictedResult</span><span class="o">]</span> <span class="o">{</span>
+
+  <span class="o">...</span>
+
+  <span class="k">def</span> <span class="n">train</span><span class="o">(</span><span class="n">data</span><span class="k">:</span> <span class="kt">PreparedData</span><span class="o">)</span><span class="k">:</span> <span class="kt">ALSModel</span> <span class="o">=</span> <span class="o">...</span>
+
+  <span class="o">...</span>
+<span class="o">}</span>
+</pre></td></tr></tbody></table> </div> <p>Simply add the new parameter <code>sc: SparkContext,</code> to <code>train()</code> function signature:</p><div class="highlight scala"><table style="border-spacing: 0"><tbody><tr><td class="gutter gl" style="text-align: right"><pre class="lineno">1
+2
+3
+4
+5
+6
+7
+8
+9</pre></td><td class="code"><pre><span class="k">class</span> <span class="nc">ALSAlgorithm</span><span class="o">(</span><span class="k">val</span> <span class="n">ap</span><span class="k">:</span> <span class="kt">ALSAlgorithmParams</span><span class="o">)</span>
+  <span class="k">extends</span> <span class="n">P2LAlgorithm</span><span class="o">[</span><span class="kt">PreparedData</span>, <span class="kt">ALSModel</span>, <span class="kt">Query</span>, <span class="kt">PredictedResult</span><span class="o">]</span> <span class="o">{</span>
+
+  <span class="o">...</span>
+
+  <span class="k">def</span> <span class="n">train</span><span class="o">(</span><span class="n">sc</span><span class="k">:</span> <span class="kt">SparkContext</span><span class="o">,</span> <span class="n">data</span><span class="k">:</span> <span class="kt">PreparedData</span><span class="o">)</span><span class="k">:</span> <span class="kt">ALSModel</span> <span class="o">=</span> <span class="o">...</span>
+
+  <span class="o">...</span>
+<span class="o">}</span>
+</pre></td></tr></tbody></table> </div> <p>You need to add the following import for your algorithm as well if it is not there:</p><div class="highlight scala"><table style="border-spacing: 0"><tbody><tr><td class="gutter gl" style="text-align: right"><pre class="lineno">1</pre></td><td class="code"><pre><span class="k">import</span> <span class="nn">org.apache.spark.SparkContext</span>
+</pre></td></tr></tbody></table> </div></li> <li><p>Modify the file <code>build.sbt</code> in your template directory to use <code>pioVersion.value</code> as the version of org.apache.predictionio.core dependency:</p><p>Under your template&#39;s root directory, you should see a file <code>build.sbt</code> which has the following content:</p><div class="highlight shell"><table style="border-spacing: 0"><tbody><tr><td class="gutter gl" style="text-align: right"><pre class="lineno">1
+2
+3
+4</pre></td><td class="code"><pre>libraryDependencies ++<span class="o">=</span> Seq<span class="o">(</span>
+  <span class="s2">"org.apache.predictionio"</span>    %% <span class="s2">"core"</span>          % <span class="s2">"0.8.6"</span> % <span class="s2">"provided"</span>,
+  <span class="s2">"org.apache.spark"</span> %% <span class="s2">"spark-core"</span>    % <span class="s2">"1.2.0"</span> % <span class="s2">"provided"</span>,
+  <span class="s2">"org.apache.spark"</span> %% <span class="s2">"spark-mllib"</span>   % <span class="s2">"1.2.0"</span> % <span class="s2">"provided"</span><span class="o">)</span>
+</pre></td></tr></tbody></table> </div> <p>Change the version of <code>&quot;org.apache.predictionio&quot; &amp;&amp; &quot;core&quot;</code> to <code>pioVersion.value</code>:</p><div class="highlight shell"><table style="border-spacing: 0"><tbody><tr><td class="gutter gl" style="text-align: right"><pre class="lineno">1
+2
+3
+4</pre></td><td class="code"><pre>libraryDependencies ++<span class="o">=</span> Seq<span class="o">(</span>
+  <span class="s2">"org.apache.predictionio"</span>    %% <span class="s2">"core"</span>          % pioVersion.value % <span class="s2">"provided"</span>,
+  <span class="s2">"org.apache.spark"</span> %% <span class="s2">"spark-core"</span>    % <span class="s2">"1.2.0"</span> % <span class="s2">"provided"</span>,
+  <span class="s2">"org.apache.spark"</span> %% <span class="s2">"spark-mllib"</span>   % <span class="s2">"1.2.0"</span> % <span class="s2">"provided"</span><span class="o">)</span>
+</pre></td></tr></tbody></table> </div></li> <li><p>Create a new file <code>pio-build.sbt</code> in template&#39;s <strong>project/</strong> directory with the following content:</p><div class="highlight shell"><table style="border-spacing: 0"><tbody><tr><td class="gutter gl" style="text-align: right"><pre class="lineno">1</pre></td><td class="code"><pre>addSbtPlugin<span class="o">(</span><span class="s2">"org.apache.predictionio"</span> % <span class="s2">"pio-build"</span> % <span class="s2">"0.9.0"</span><span class="o">)</span>
+</pre></td></tr></tbody></table> </div> <p>Then, you should see the following two files in the <strong>project/</strong> directory:</p><div class="highlight shell"><table style="border-spacing: 0"><tbody><tr><td class="gutter gl" style="text-align: right"><pre class="lineno">1
+2</pre></td><td class="code"><pre><span class="gp">your_template_directory$ </span>ls project/
+assembly.sbt  pio-build.sbt
+</pre></td></tr></tbody></table> </div></li> <li><p>Create a new file <code>template.json</code> file in the engine template&#39;s root directory with the following content:</p><div class="highlight shell"><table style="border-spacing: 0"><tbody><tr><td class="gutter gl" style="text-align: right"><pre class="lineno">1</pre></td><td class="code"><pre><span class="o">{</span><span class="s2">"pio"</span>: <span class="o">{</span><span class="s2">"version"</span>: <span class="o">{</span> <span class="s2">"min"</span>: <span class="s2">"0.9.0"</span> <span class="o">}}}</span>
+</pre></td></tr></tbody></table> </div> <p>This is to specify the minium PredictionIO version which the engine can run with.</p></li> <li><p>Lastly, you can add <code>/pio.sbt</code> into your engine template&#39;s <code>.gitignore</code>. <code>pio.sbt</code> is automatically generated by <code>pio build</code>.</p></li> </ol> <p>That&#39;s it! Now you can run <code>pio build</code>, <code>pio train</code> and <code>pio deploy</code> with PredictionIO 0.9.0 in the same way as before!</p><h2 id='upgrade-to-0.8.4' class='header-anchors'>Upgrade to 0.8.4</h2><p><strong>engine.json</strong> has slightly changed its format in 0.8.4 in order to make engine more flexible. If you are upgrading to 0.8.4, engine.json needs to have the <code>params</code> field for <em>datasource</em>, <em>preparator</em>, and <em>serving</em>. Here is the sample engine.json from templates/scala-parallel-recommendation-custom-preparator that demonstrate the change for <em>datasource</em> (line 7).</p><div cla
 ss="highlight shell"><table style="border-spacing: 0"><tbody><tr><td class="gutter gl" style="text-align: right"><pre class="lineno">1
+2
+3
+4
+5
+6
+7
+8
+9
+10
+11
+12
+13
+14
+15
+16
+17
+18
+19</pre></td><td class="code"><pre>In 0.8.3
+<span class="o">{</span>
+  <span class="s2">"id"</span>: <span class="s2">"default"</span>,
+  <span class="s2">"description"</span>: <span class="s2">"Default settings"</span>,
+  <span class="s2">"engineFactory"</span>: <span class="s2">"org.template.recommendation.RecommendationEngine"</span>,
+  <span class="s2">"datasource"</span>: <span class="o">{</span>
+    <span class="s2">"appId"</span>: 1
+  <span class="o">}</span>,
+  <span class="s2">"algorithms"</span>: <span class="o">[</span>
+    <span class="o">{</span>
+      <span class="s2">"name"</span>: <span class="s2">"als"</span>,
+      <span class="s2">"params"</span>: <span class="o">{</span>
+        <span class="s2">"rank"</span>: 10,
+        <span class="s2">"numIterations"</span>: 20,
+        <span class="s2">"lambda"</span>: 0.01
+      <span class="o">}</span>
+    <span class="o">}</span>
+  <span class="o">]</span>
+<span class="o">}</span>
+</pre></td></tr></tbody></table> </div> <div class="highlight shell"><table style="border-spacing: 0"><tbody><tr><td class="gutter gl" style="text-align: right"><pre class="lineno">1
+2
+3
+4
+5
+6
+7
+8
+9
+10
+11
+12
+13
+14
+15
+16
+17
+18
+19
+20</pre></td><td class="code"><pre>In 0.8.4
+<span class="o">{</span>
+  <span class="s2">"id"</span>: <span class="s2">"default"</span>,
+  <span class="s2">"description"</span>: <span class="s2">"Default settings"</span>,
+  <span class="s2">"engineFactory"</span>: <span class="s2">"org.template.recommendation.RecommendationEngine"</span>,
+  <span class="s2">"datasource"</span>: <span class="o">{</span>
+    <span class="s2">"params"</span> : <span class="o">{</span>
+      <span class="s2">"appId"</span>: 1
+    <span class="o">}</span>
+  <span class="o">}</span>,
+  <span class="s2">"algorithms"</span>: <span class="o">[</span>
+    <span class="o">{</span>
+      <span class="s2">"name"</span>: <span class="s2">"als"</span>,
+      <span class="s2">"params"</span>: <span class="o">{</span>
+        <span class="s2">"rank"</span>: 10,
+        <span class="s2">"numIterations"</span>: 20,
+        <span class="s2">"lambda"</span>: 0.01
+      <span class="o">}</span>
+    <span class="o">}</span>
+  <span class="o">]</span>
+</pre></td></tr></tbody></table> </div> <h2 id='upgrade-from-0.8.2-to-0.8.3' class='header-anchors'>Upgrade from 0.8.2 to 0.8.3</h2><p>0.8.3 disallows entity types <strong>pio_user</strong> and <strong>pio_item</strong>. These types are used by default for most SDKs. They are deprecated in 0.8.3, and SDKs helper functions have been updated to use <strong>user</strong> and <strong>item</strong> instead.</p><p>If you are upgrading to 0.8.3, you can follow these steps to migrate your data.</p><h5 id='1.-create-a-new-app' class='header-anchors'>1. Create a new app</h5><div class="highlight shell"><table style="border-spacing: 0"><tbody><tr><td class="gutter gl" style="text-align: right"><pre class="lineno">1</pre></td><td class="code"><pre><span class="gp">$ </span>pio app new &lt;my app name&gt;
+</pre></td></tr></tbody></table> </div> <p>Please take note of the <new app id> generated for the new app.</p><h5 id='2.-run-the-upgrade-command' class='header-anchors'>2. Run the upgrade command</h5><div class="highlight shell"><table style="border-spacing: 0"><tbody><tr><td class="gutter gl" style="text-align: right"><pre class="lineno">1</pre></td><td class="code"><pre><span class="gp">$ </span>pio upgrade 0.8.2 0.8.3 &lt;old app id&gt; &lt;new app id&gt;
+</pre></td></tr></tbody></table> </div> <p>It will run a script that creates a new app with the new app id and migreate the data to the new app.</p><h5 id='3.-update-<strong>engine.json</strong>-to-use-the-new-app-id.-<strong>engine.json</strong>-is-located-under-your-engine-project-directory.' class='header-anchors' >3. Update <strong>engine.json</strong> to use the new app id. <strong>Engine.json</strong> is located under your engine project directory.</h5><div class="highlight shell"><table style="border-spacing: 0"><tbody><tr><td class="gutter gl" style="text-align: right"><pre class="lineno">1
+2
+3</pre></td><td class="code"><pre>  <span class="s2">"datasource"</span>: <span class="o">{</span>
+    <span class="s2">"appId"</span>: &lt;new app id&gt;
+  <span class="o">}</span>,
+</pre></td></tr></tbody></table> </div> <h2 id='schema-changes-in-0.8.2' class='header-anchors'>Schema Changes in 0.8.2</h2><p>0.8.2 contains HBase and Elasticsearch schema changes from previous versions. If you are upgrading from a pre-0.8.2 version, you need to first clear HBase and ElasticSearch. These will clear out all data in Elasticsearch and HBase. Please be extra cautious.</p><div class="alert-message danger"><p><strong>ALL EXISTING DATA WILL BE LOST!</strong></p></div><h3 id='clearing-elasticsearch' class='header-anchors'>Clearing Elasticsearch</h3><p>With Elasticsearch running, do</p><div class="highlight shell"><table style="border-spacing: 0"><tbody><tr><td class="gutter gl" style="text-align: right"><pre class="lineno">1</pre></td><td class="code"><pre><span class="gp">$ </span>curl -X DELETE http://localhost:9200/_all
+</pre></td></tr></tbody></table> </div> <p>For details see <a href="http://www.elasticsearch.org/guide/en/elasticsearch/reference/current/indices-delete-index.html">http://www.elasticsearch.org/guide/en/elasticsearch/reference/current/indices-delete-index.html</a>.</p><h3 id='clearing-hbase' class='header-anchors'>Clearing HBase</h3><div class="highlight shell"><table style="border-spacing: 0"><tbody><tr><td class="gutter gl" style="text-align: right"><pre class="lineno">1
+2
+3
+4
+5
+6</pre></td><td class="code"><pre><span class="gp">$ </span><span class="nv">$HBASE_HOME</span>/bin/hbase shell
+...
+<span class="gp">&gt; </span>disable_all <span class="s1">'predictionio.*'</span>
+...
+<span class="gp">&gt; </span>drop_all <span class="s1">'predictionio.*'</span>
+...
+</pre></td></tr></tbody></table> </div> <p>For details see <a href="http://wiki.apache.org/hadoop/Hbase/Shell">http://wiki.apache.org/hadoop/Hbase/Shell</a>.</p><h2 id='experimental-upgrade-tool-(upgrade-hbase-schema-from-0.8.0/0.8.1-to-0.8.2)' class='header-anchors'>Experimental upgrade tool (Upgrade HBase schema from 0.8.0/0.8.1 to 0.8.2)</h2><p>Create an app to store the data</p><div class="highlight shell"><table style="border-spacing: 0"><tbody><tr><td class="gutter gl" style="text-align: right"><pre class="lineno">1</pre></td><td class="code"><pre><span class="gp">$ </span>bin/pio app new &lt;my app&gt;
+</pre></td></tr></tbody></table> </div> <p>Replace by the returned app ID: ( is the original app ID used in 0.8.0/0.8.2.)</p><div class="highlight shell"><table style="border-spacing: 0"><tbody><tr><td class="gutter gl" style="text-align: right"><pre class="lineno">1
+2
+3
+4</pre></td><td class="code"><pre><span class="gp">$ </span><span class="nb">set</span> -a
+<span class="gp">$ </span><span class="nb">source </span>conf/pio-env.sh
+<span class="gp">$ </span><span class="nb">set</span> +a
+<span class="gp">$ </span>sbt/sbt <span class="s2">"data/run-main org.apache.predictionio.data.storage.hbase.upgrade.Upgrade &lt;from app ID&gt;"</span> <span class="s2">"&lt;to app ID&gt;"</span>
+</pre></td></tr></tbody></table> </div> </div></div></div></div><footer><div class="container"><div class="seperator"></div><div class="row"><div class="col-md-6 col-xs-6 footer-link-column"><div class="footer-link-column-row"><h4>Community</h4><ul><li><a href="//docs.prediction.io/install/" target="blank">Download</a></li><li><a href="//docs.prediction.io/" target="blank">Docs</a></li><li><a href="//github.com/apache/incubator-predictionio" target="blank">GitHub</a></li><li><a href="mailto:user-subscribe@predictionio.incubator.apache.org" target="blank">Subscribe to User Mailing List</a></li><li><a href="//stackoverflow.com/questions/tagged/predictionio" target="blank">Stackoverflow</a></li></ul></div></div><div class="col-md-6 col-xs-6 footer-link-column"><div class="footer-link-column-row"><h4>Contribute</h4><ul><li><a href="//predictionio.incubator.apache.org/community/contribute-code/" target="blank">Contribute</a></li><li><a href="//github.com/apache/incubator-predictionio" ta
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