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 >Tools</span></a></li></ul></li><li class="level-1"><a class="expandible" 
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 osing an Algorithm(s)</span></a><ul><li class="level-2"><a class="final" 
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 ><ul><li class="level-2"><a class="final" 
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 ><span>Event Server Overview</span></a></li><li class="level-2"><a 
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 ass="final" href="/algorithm/"><span>Built-in Algorithm 
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 an>Community Contributed Demo</span></a></li><li class="level-2"><a 
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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 
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 rces/faq/"><span>FAQs</span></a></li><li class="level-2"><a class="final" 
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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="#">Getting Help</a><span class="spacer">&gt;</span></li><li><span 
class="last">FAQs</span></li></ul></div><div id="page-title"><h1>Frequently 
Asked Questions</h1></div></div><div id="table-of-content-wrapper"><h5>On this 
page</h5><aside id="table-of-contents"><ul> <li> <a href="#using-p
 redictionio">Using PredictionIO</a> </li> <li> <a 
href="#problem-with-event-server">Problem with Event Server</a> </li> <li> <a 
href="#engine-training">Engine Training</a> </li> <li> <a 
href="#deploy-engine">Deploy Engine</a> </li> <li> <a 
href="#building-predictionio">Building PredictionIO</a> </li> <li> <a 
href="#engine-development">Engine Development</a> </li> <li> <a 
href="#running-hbase">Running HBase</a> </li> </ul> </aside><hr/><a 
id="edit-page-link" 
href="https://github.com/apache/incubator-predictionio/tree/livedoc/docs/manual/source/resources/faq.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="#">Getting Help</a><span 
class="spacer">&gt;</span></li><li><span 
class="last">FAQs</span></li></ul></div><div id="page-title"><h1>Frequently 
Asked Questions</h1></div></div><div class="content"><h2 
id='using-predictionio' class='heade
 r-anchors'>Using PredictionIO</h2><h3 
id='q:-how-do-i-check-to-see-if-various-dependencies,-such-as-elasticsearch-and-hbase,-are-running?'
 class='header-anchors'>Q: How do I check to see if various dependencies, such 
as ElasticSearch and HBase, are running?</h3><p>You can run <code>$ pio 
status</code> from the terminal and it will return the status of various 
components that PredictionIO depends on.</p> <ul> <li> You should see the 
following message if everything is OK:</li> </ul> <div class="highlight 
shell"><table style="border-spacing: 0"><tbody><tr><td class="gutter gl" 
style="text-align: right"><pre class="lineno">1
+<!DOCTYPE html><html><head><title>Frequently Asked Questions</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="Frequently Asked Questions"/><link 
rel="canonical" href="https://docs.prediction.io/resources/faq/"/><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
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 /MathJax.js?config=TeX-AMS-MML_HTMLorMML"></script><script 
src="//use.typekit.net/pqo0itb.js"></script><script>try{Typekit.load({ async: 
true });}catch(e){}</script></head><body><div id="global"><header><div 
class="container" id="header-wrapper"><div class="row"><div 
class="col-sm-12"><div id="logo-wrapper"><span id="drawer-toggle"></span><a 
href="#"></a><a href="http://predictionio.incubator.apache.org/";><img 
alt="PredictionIO" id="logo" 
src="/images/logos/logo-ee2b9bb3.png"/></a></div><div id="menu-wrapper"><div 
id="pill-wrapper"><a class="pill left" 
href="/gallery/template-gallery">TEMPLATES</a> <a class="pill right" 
href="//github.com/apache/incubator-predictionio/">OPEN 
SOURCE</a></div></div><img class="mobile-search-bar-toggler hidden-md 
hidden-lg" 
src="/images/icons/search-glass-704bd4ff.png"/></div></div></div></header><div 
id="search-bar-row-wrapper"><div class="container-fluid" 
id="search-bar-row"><div class="row"><div class="col-md-9 col-sm-11 
col-xs-11"><div class="hidde
 n-md hidden-lg" id="mobile-page-heading-wrapper"><p>PredictionIO 
Docs</p><h4>FAQs</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 
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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-m
 ain"><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="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 
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class="level-3"><a class="final" href="/sdk/php/"><span>PHP 
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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="final" hr
 ef="/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>Choosing an Algorithm(s)</span></a><ul><li class="level-2"><a cla
 ss="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 class="fi
 nal" 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" 
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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 
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href="/community/contribute-documentation/"><span>Contribute 
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href="#"><span>Getting Help</span></a><ul><li class="level-2"><a class="final 
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class="level-2"><a class="final" href="/resources/intellij/"><span>Developing 
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class="level-2"><a class="final" 
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hidden-lg"><div id="breadcrumbs" class="hidden-sm hidden xs"><ul><li><a 
href="#">Getting Help</a><span class="spacer">&gt;</span></li><li><span 
class="last">FAQs</span></li></ul></div><div id="page-title"><h1>Frequently 
Asked Questions</h1></div></div><div id="table-of-content-wrapper"><h5>On this 
page</h5><aside id="table-of-contents"><ul> <li> <a href="#using-pr
 edictionio">Using PredictionIO</a> </li> <li> <a 
href="#problem-with-event-server">Problem with Event Server</a> </li> <li> <a 
href="#engine-training">Engine Training</a> </li> <li> <a 
href="#deploy-engine">Deploy Engine</a> </li> <li> <a 
href="#building-predictionio">Building PredictionIO</a> </li> <li> <a 
href="#engine-development">Engine Development</a> </li> <li> <a 
href="#running-hbase">Running HBase</a> </li> </ul> </aside><hr/><a 
id="edit-page-link" 
href="https://github.com/apache/incubator-predictionio/tree/livedoc/docs/manual/source/resources/faq.html.md";><img
 src="/images/icons/edit-pencil-d6c1bb3d.png"/>Edit this page</a></div><div 
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class="hidden-sm hidden xs"><ul><li><a href="#">Getting Help</a><span 
class="spacer">&gt;</span></li><li><span 
class="last">FAQs</span></li></ul></div><div id="page-title"><h1>Frequently 
Asked Questions</h1></div></div><div class="content"><h2 
id='using-predictionio' class='header
 -anchors'>Using PredictionIO</h2><h3 
id='q:-how-do-i-check-to-see-if-various-dependencies,-such-as-elasticsearch-and-hbase,-are-running?'
 class='header-anchors'>Q: How do I check to see if various dependencies, such 
as ElasticSearch and HBase, are running?</h3><p>You can run <code>$ pio 
status</code> from the terminal and it will return the status of various 
components that PredictionIO depends on.</p> <ul> <li> You should see the 
following message if everything is OK:</li> </ul> <div class="highlight 
shell"><table style="border-spacing: 0"><tbody><tr><td class="gutter gl" 
style="text-align: right"><pre class="lineno">1
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class="final" href="/algorith
 m/"><span>Built-in Algorithm Libraries</span></a></li><li class="level-2"><a 
class="final" href="/algorithm/switch/"><span>Switching to Another 
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href="/algorithm/custom/"><span>Adding Your Own 
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class="final" href="/evaluation/"><span>Overview</span></a></li><li 
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href="/evaluation/paramtuning/"><span>Hyperparameter Tuning</span></a></li><li 
class="level-2"><a class="final" 
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class="last">Glossary</span></li></ul></div><div 
id="page-title"><h1>Glossary</h1></div></div><div 
id="table-of-content-wrapper"><a id="edit-page-link" 
href="https://github.com/apache/incubator-predictionio/tree/livedoc/docs/manual/source/resources/gl
 ossary.html.md"><img src="/images/icons/edit-pencil-d6c1bb3d.png"/>Edit this 
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id="breadcrumbs" class="hidden-sm hidden xs"><ul><li><a 
href="#">Resources</a><span class="spacer">&gt;</span></li><li><span 
class="last">Glossary</span></li></ul></div><div 
id="page-title"><h1>Glossary</h1></div></div><div 
class="content"><p><strong>Data Preparator</strong> - Part of Engine. It reads 
data from source and transforms it to the desired format.</p><p><strong>Data 
Source</strong> - Part of Engine. It preprocesses the data and forward it to 
the algorithm for model training.</p><p><strong>Engine</strong> - An Engine 
represents a type of prediction, e.g. product recommendation. It is comprised 
of four components: [D] Data Source and Data Preparator, [A] Algorithm, [S] 
Serving, [E] Evaluation Metrics.</p><p><strong>EngineClient</strong> - Part of 
PredictionSDK. It sends queries to a deployed engine instance through the 
Engine API an
 d retrives prediction results.</p><p><strong>Event API</strong> - Please see 
Event Server.</p><p><strong>Event Server</strong> - Event Server is designed to 
collect data into PredictionIO in an event-based style. Once the Event Server 
is launched, your application can send data to it through its Event API with 
HTTP requests or with the EventClient of PredictionIO&#39;s 
SDKs.</p><p><strong>EventClient</strong> - Please see Event 
Server.</p><p><strong>Live Evaluation</strong> - Evaluation of prediction 
results in a production environment. Prediction results are shown to real 
users. Users do not rate the results explicitly but the system observes user 
behaviors such as click through rate.</p><p><strong>Offline Evaluation</strong> 
- The prediction results are compared with pre-compiled offline datasets. 
Typically, offline evaluations are meant to identify the most promising 
approaches.</p><p><strong>Test Data</strong> - Also commonly referred as Test 
Set. A set of data used to assess th
 e strength and utility of a predictive relationship.</p><p><strong>Training 
Data</strong> - Also commonly referred as Training Set. A set of data used to 
discover potentially predictive relationships. In PredictionIO Engine, training 
data is processed through the Data layer and passed onto 
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id="page-title"><h1>Glossary</h1></div></div><div 
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id="page-title"><h1>Glossary</h1></div></div><div 
class="content"><p><strong>Data Preparator</strong> - Part of Engine. It reads 
data from source and transforms it to the desired format.</p><p><strong>Data 
Source</strong> - Part of Engine. It preprocesses the data and forward it to 
the algorithm for model training.</p><p><strong>Engine</strong> - An Engine 
represents a type of prediction, e.g. product recommendation. It is comprised 
of four components: [D] Data Source and Data Preparator, [A] Algorithm, [S] 
Serving, [E] Evaluation Metrics.</p><p><strong>EngineClient</strong> - Part of 
PredictionSDK. It sends queries to a deployed engine instance through the 
Engine API and
  retrives prediction results.</p><p><strong>Event API</strong> - Please see 
Event Server.</p><p><strong>Event Server</strong> - Event Server is designed to 
collect data into PredictionIO in an event-based style. Once the Event Server 
is launched, your application can send data to it through its Event API with 
HTTP requests or with the EventClient of PredictionIO&#39;s 
SDKs.</p><p><strong>EventClient</strong> - Please see Event 
Server.</p><p><strong>Live Evaluation</strong> - Evaluation of prediction 
results in a production environment. Prediction results are shown to real 
users. Users do not rate the results explicitly but the system observes user 
behaviors such as click through rate.</p><p><strong>Offline Evaluation</strong> 
- The prediction results are compared with pre-compiled offline datasets. 
Typically, offline evaluations are meant to identify the most promising 
approaches.</p><p><strong>Test Data</strong> - Also commonly referred as Test 
Set. A set of data used to assess the
  strength and utility of a predictive relationship.</p><p><strong>Training 
Data</strong> - Also commonly referred as Training Set. A set of data used to 
discover potentially predictive relationships. In PredictionIO Engine, training 
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